Information acquisition method and information acquisition device

Abstract

An information acquisition method of one embodiment of the present disclosure pertains to a rotating body that is rotatably supported by a non-contact bearing and rotates about an axis of rotation, the method comprising: a step for measuring low-range vibration data along a direction intersecting the axis of rotation during a state of rotation at a low-range rotational speed lower than a specific rotational speed; a step for calculating runout information indicating a degree of whirling caused by the shape of the rotating body on the basis of the low-range vibration data; a step for measuring specific vibration data along a direction intersecting the axis of rotation during a state of rotation at the specific rotational speed; and a step for calculating 1X rotational component information about the rotating body on the basis of the runout information and the specific vibration data.

Description

Information acquisition method and information acquisition device

[0001] This disclosure relates to an information acquisition method and an information acquisition apparatus.

[0002] When vibrations of a high-speed rotating body are measured using a vibration meter, vibration displacement data is obtained. This vibration displacement data includes vibration components due to dynamic unbalance resulting from the non-uniformity of the mass distribution around the rotation axis of the rotating body. Furthermore, this vibration displacement data may include components from factors other than those caused by dynamic unbalance. For example, one such component is a component that appears to be vibrating due to the external shape of the rotating body. This phenomenon is called runout.

[0003] For example, Patent Document 1 discloses a rotating machinery testing apparatus. This testing apparatus determines the runout amount (shape irregularity) of a rotating body when it is stationary, and then determines the runout amount at rotational speed during operation from this runout amount. By subtracting the runout amount during operation from the rotational synchronous vibration during operation, vibration characteristics can be obtained.

[0004] Japanese Patent Application Publication No. 7-270229

[0005] To correct the dynamic balance of a rotating body, it is necessary to accurately know the vibration components caused by the dynamic unbalance. These vibration components are, for example, the first-order rotational components. As shown in Patent Document 1, vibration displacement data obtained using a vibration meter may include apparent vibration components caused by runout, which are not the vibration components caused by dynamic unbalance. Therefore, to obtain the vibration components caused by dynamic unbalance, it is necessary to subtract the apparent vibration components caused by runout from the vibration displacement data obtained using a vibration meter. Several methods for subtracting apparent vibration components caused by runout have been proposed, including in Patent Document 1. However, in this technical field, there is a need for a technology that can easily obtain the vibration components caused by dynamic unbalance.

[0006] This disclosure provides an information acquisition method and information acquisition apparatus that can easily obtain vibration components due to dynamic imbalance.

[0007] An information acquisition method relating to one aspect of this disclosure is a method for acquiring information about a rotating body that is rotatably supported by a non-contact bearing and rotates about a rotation axis, and includes the steps of: acquiring low-frequency vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a low-frequency rotation speed lower than a specific rotation speed; calculating runout information indicating the degree of runout caused by the shape of the rotating body based on the low-frequency vibration data; measuring specific vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a specific rotation speed; and calculating rotational primary component information of the rotating body based on the runout information and the specific vibration data.

[0008] In this information acquisition method, runout information is calculated based on low-frequency vibration data along the direction intersecting the axis of rotation when the rotating body is rotating at a low-frequency rotational speed lower than a specific rotational speed. This allows for obtaining rotational first-order component information with fewer unknowns than before. Rotational first-order component information includes vibration components due to dynamic imbalance. In this way, vibration components due to dynamic imbalance can be easily obtained.

[0009] In some embodiments, the acquisition step may involve measuring low-frequency vibration data, and the steps of acquiring low-frequency vibration data and calculating runout information may be performed at least one of the following steps: before or after the step of measuring specific vibration data. In this case, since runout information is acquired at at least one of the following timings (before or after measuring specific vibration data), the runout information can be updated.

[0010] In some embodiments, the step of calculating rotational linear component information may be performed after each of the two runout information calculation steps. In this case, the rotational linear component information can reflect the latest runout information. Therefore, this information acquisition method allows for the acquisition of highly accurate rotational linear component information.

[0011] In some embodiments, the acquisition step may further include measuring low-frequency vibration data and stopping the rotation of the rotating body after the step of acquiring the low-frequency vibration data but before the step of measuring specific vibration data. In this case, the specific vibration data is measured after the measurement of the low-frequency vibration data is completed. In the step of calculating runout information, the step of measuring specific vibration data can be performed when the runout information is ready to be calculated or when the runout information has already been calculated, so that the process can smoothly transition to the step of calculating rotational primary component information.

[0012] In some embodiments, the step of calculating rotational first-order component information may be initiated while the step of measuring specific vibration data is being performed. In this case, once at least a portion of the measured specific vibration data has been collected, the rotational first-order component information can be calculated based on the specific vibration data and known runout information. This allows for efficient acquisition of rotational first-order component information.

[0013] In some embodiments, the step of measuring specific vibration data involves increasing the speed of a rotating body to multiple specific rotational speeds, measuring specific vibration data corresponding to each of the multiple specific rotational speeds, and calculating rotational primary component information. In the step of calculating rotational primary component information, rotational primary component information corresponding to at least one of the multiple specific rotational speeds may be calculated while the rotating body is increasing speed. In this case, since specific vibration data corresponding to each of the multiple specific rotational speeds is measured, rotational primary component information can be calculated using a previously measured specific rotational speed other than the one being measured, based on the specific vibration data and known runout information. Therefore, rotational primary component information can be acquired efficiently.

[0014] In some embodiments, the step of measuring specific vibration data may further include the step of rotating the rotating body at multiple specific rotational speeds in both a state where mass change processing that changes the mass of the rotating body is not performed and a state where mass change processing that changes the mass of the rotating body is performed, measuring specific vibration data corresponding to each of the multiple specific rotational speeds, and calculating an influence coefficient that indicates the degree to which the mass change processing has an effect on the vibration of the rotating body based on the specific vibration data. In this case, since rotational first-order component information can be obtained with fewer unknowns compared to the conventional technology, the influence coefficient can be obtained with a small number of measurement data. Therefore, a highly accurate influence coefficient based on runout information can be easily obtained with a small amount of measurement data.

[0015] In some embodiments, the method may further include a step of calculating unbalance information based on rotational first-order component information and influence coefficients. In this case, rotational first-order component information can be obtained with fewer unknowns compared to the conventional technique, and therefore unbalance information can be obtained with a smaller number of measurement data. Thus, highly accurate unbalance information based on runout information can be easily obtained with a small amount of measurement data.

[0016] In some embodiments, the process further includes a step of determining whether the rotational primary component information meets a criterion, and the step of calculating unbalance information may be calculated if, in the determination step, the rotational primary component information meets the criterion. In this case, the rotational primary component information meeting the criterion means, for example, that it is suggested that the unbalance of the rotating body should be corrected. This makes it easy to determine whether or not the unbalance of the rotating body needs to be corrected.

[0017] In some embodiments, the method may further include a step of determining whether the rotational primary component information is above a reference value, and a step of stopping the rotation of the rotating body if it is determined in the determination step that the rotational primary component information is above a reference value. If it is determined in the determination step that the rotational primary component information is above a reference value, for example, it suggests that the unbalance of the rotating body is excessive. In such cases, stopping the rotation of the rotating body allows for efficient maintenance of the rotating body.

[0018] An information acquisition system relating to one aspect of this disclosure is an information acquisition device for a rotating body that is rotatably supported by a non-contact bearing and rotates about a rotation axis, comprising: an acquisition unit that acquires low-frequency vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a low-frequency rotation speed lower than a specific rotation speed; a first calculation unit that calculates runout information indicating the degree of runout caused by the shape of the rotating body based on the low-frequency vibration data; a measurement unit that measures specific vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a specific rotation speed; and a second calculation unit that calculates the primary rotation component of the rotating body based on the runout information and the specific vibration data.

[0019] This information acquisition device produces the same effects as the information acquisition method described above.

[0020] According to the present invention, an information acquisition method and information acquisition apparatus are provided that can easily obtain vibration components due to dynamic imbalance.

[0021] Figure 1 is a schematic diagram showing an information acquisition system including an information acquisition device according to one embodiment. Figure 2 is a flowchart of an information acquisition method according to one embodiment. Figure 3 is a flowchart of the initial calculation process of the influence coefficient included in the information acquisition method according to one embodiment. Figure 4 is a flowchart of the runout acquisition process included in the information acquisition method according to one embodiment. Figure 5 is a flowchart of the balance measurement process included in the information acquisition method according to one embodiment. Figure 6 is a functional block diagram showing an information acquisition device according to one embodiment. Figure 7 is a diagram illustrating a method for acquiring runout information.

[0022] Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant explanations are omitted.

[0023] As shown in Figure 1, the information acquisition method and information acquisition device 1 of the present disclosure are used to correct the balance of a rotating body 9 that rotates about a rotation axis A. The rotating body 9 has a shaft 90 and two impellers 91 and 92. The rotating body 9 is, for example, a component of a supercharger. The rotating body 9 is rotatably supported by two journal bearings 93 and 94 and a pair of thrust bearings 95.

[0024] Journal bearings 93 and 94 are non-contact bearings. For example, journal bearings 93 and 94 are a type of gas bearing. Journal bearings 93 and 94 levitate during rotation by entraining fluid between the shaft 90 and the inner circumferential surface of the bearings. When the rotational speed is higher than a predetermined levitation speed, the rotating body 9 does not physically contact the journal bearings 93 and 94.

[0025] Similarly, the thrust bearing 95 is also a non-contact type bearing. For example, the thrust bearing 95 may be a foil bearing using a corrugated bump foil. When the shaft 90 rotates at a rotational speed higher than a predetermined speed, a fluid film is formed between the thrust collar 96 and the thrust bearing 95. Therefore, when the shaft 90 rotates at a rotational speed higher than a predetermined speed, the rotating body 9 does not physically contact the thrust bearing 95.

[0026] When there is a bias in the mass distribution of the rotating body 9 around the axis of rotation A, a centrifugal force corresponding to the biased mass acts periodically on the rotating body 9. In other words, the rotating body 9 may vibrate at a frequency corresponding to the rotational speed.

[0027] When the rotating body 9 is rotated around the rotation axis A, the displacement sensors 21 and 22 detect periodic displacement fluctuations with a frequency corresponding to the rotation speed, due to the non-uniformity of the external shape relative to the rotation axis A. Therefore, the rotating body 9 appears to be vibrating. This apparent vibration is called runout.

[0028] When the rotating body 9 is rotated, the periodic displacement information captured by the displacement sensors 21 and 22 includes a component due to dynamic unbalance and a component due to runout. The component due to dynamic unbalance is, for example, a primary rotational component. The purpose of balancing the rotating body 9 is to reduce the component due to dynamic unbalance. Therefore, if the output of the displacement sensors 21 and 22 includes a component due to runout, the accuracy of the balance correction tends to decrease. The information acquisition method and information acquisition device 1 of this disclosure can easily obtain vibration components (primary rotational components) due to dynamic unbalance. The information acquisition method and information acquisition device 1 of this disclosure may suppress the effects of runout and obtain good balance correction information.

[0029] When the rotating body 9 is rotated at an extremely low speed, the centrifugal force decreases. Therefore, the magnitude of the component caused by dynamic imbalance decreases. On the other hand, the component caused by runout is due to the shape of the rotating body 9, and therefore the magnitude of the runout component is not affected by the rotational speed. Thus, in order to estimate the runout component, it is conceivable to rotate the rotating body 9 at an extremely low speed.

[0030] However, as mentioned above, the rotating body 9 covered by this disclosure is supported by non-contact type journal bearings 93 and 94. For the journal bearings 93 and 94 to be in a non-contact rotational support state, the rotational speed of the rotating body 9 must be higher than a predetermined levitation speed. In other words, it is difficult to estimate the runout component by rotating the rotating body 9 at an extremely low speed.

[0031] Let's consider the case where the rotating body 9 is supported by a contact-type bearing, such as a rolling bearing. In this case, vibrations from the rotating body 9 are transmitted to the bearing, and further to the housing in which the bearing is mounted. Therefore, vibrations from the rotating body 9 supported by a contact-type bearing, such as a rolling bearing, can be indirectly detected by a sensor attached to the housing.

[0032] However, as described above, the rotating body 9 covered by this disclosure is supported by non-contact type journal bearings 93 and 94. Vibrations of the rotating body 9 are not easily transmitted to the housing or other parts via the journal bearings 93 and 94 and the thrust bearing 95. Therefore, vibrations of the rotating body 9 covered by this disclosure can be measured with higher accuracy by using non-contact type displacement sensors 21 and 22 and a rotation pulse sensor 23.

[0033] The following describes in detail the information acquisition method and information acquisition apparatus 1 for obtaining rotational primary component information as disclosed herein.

[0034] [Method for obtaining rotational primary component information] A rotating body correction method including an information acquisition method for obtaining rotational primary component information will be described with reference to Figures 2 to 5. The rotating body correction method of this disclosure includes an information acquisition method for obtaining rotational primary component information and a method for correcting the balance. The rotating body correction method can determine whether or not it is necessary to correct the balance of the rotating body 9 by obtaining rotational primary component information. The rotating body correction method obtains unbalance information in order to correct the balance of the rotating body 9. The rotating body correction method includes a process for obtaining runout information, a process for obtaining rotational primary component information, a process for obtaining an influence coefficient, and a process for obtaining unbalance information. The rotating body correction method is executed after the rotating body 9 is placed on the supercharger.

[0035] First, the initial calculation process for the influence coefficients is performed (step S1). In the initial acquisition process for the influence coefficients, the information acquisition device 1 is used to acquire the influence coefficients. Details of the initial acquisition process for the influence coefficients will be described later.

[0036] Next, the runout acquisition process is executed (step S2). In the runout acquisition process, the information acquisition device 1 acquires runout information. Details of the runout acquisition process will be described later.

[0037] Next, the balance measurement process is performed (step S3). The balance measurement process is performed by the displacement sensors 21 and 22, the rotation pulse sensor 23, and the information acquisition device 1. The balance measurement process includes the process of acquiring rotational primary component information and the process of measuring data for the influence coefficient. In the balance measurement process, rotational primary component information is calculated based on the runout information acquired in the runout acquisition process (step S2). Details of the balance measurement process will be described later.

[0038] Next, the information acquisition device 1 determines whether or not it is possible to newly acquire an influence coefficient based on the data acquired in the balance measurement process (step S3) (step S4). If the data for the influence coefficient acquired in the balance measurement process (step S3) is greater than or equal to a predetermined amount, it is determined that it is possible to newly acquire an influence coefficient (step S4: YES), and the process proceeds to step S5. If the data for the influence coefficient is less than the predetermined amount, it is determined that it is not possible to newly acquire an influence coefficient (step S4: NO), and the process proceeds to step S6. Here, the data for the influence coefficient includes at least data relating to vibration values ​​and mass changes.

[0039] If it is determined that the data for the influence coefficient is greater than or equal to a predetermined amount (Step S4: YES), the process for calculating the influence coefficient is executed (Step S5). Step S5 is executed by the information acquisition device 1. Details of the process for calculating the influence coefficient will be described later.

[0040] If it is determined that the data for the influence coefficient is less than a predetermined amount (Step S4: NO), a process to acquire the already set influence coefficient is executed (Step S6). In Step S6, for example, the influence coefficient calculated in the initial influence coefficient acquisition process (Step S1) is acquired. Step S6 is executed by the information acquisition device 1. Details of the process for acquiring the influence coefficient will be described later.

[0041] The unbalance information calculation process is performed (step S7). The unbalance information calculation process is performed by the information acquisition device 1. The unbalance information includes information indicating the state of imbalance of the rotating body 9. The unbalance information may include, for example, a correction mass and the position (phase) at which the correction mass is applied. The unbalance information may also include information that indirectly provides information regarding the correction mass and the position. Details of the process for calculating the unbalance information will be described later.

[0042] Next, the rotation of the rotating body is stopped (step S8). The rotation of the rotating body is stopped when the runout acquisition process (step S1) or balance measurement process (step S2) is executed, if the rotating body is rotating. In step S8, the information acquisition device 1 stops applying driving force to the rotating body 9. Note that if the rotating body has already stopped when step S7 is completed, step S8 does not need to be executed.

[0043] Next, the information acquisition device 1 determines whether the rotational primary component information calculated in the balance measurement process (step S3) meets the standard (step S9). If the rotational primary component included in the rotational primary component information is less than a predetermined standard value, it is determined that the rotational primary component information meets the standard (step S9: YES), and it is determined that no correction of the rotational balance of the rotating body 9 is necessary. In this case, the rotating body correction method ends. If the rotational primary component included in the rotational primary component information is greater than or equal to a predetermined standard value, it is determined that the rotational primary component information does not meet the standard (step S9: NO), and it is determined that correction of the rotational balance of the rotating body 9 is necessary. In this case, the rotating body correction method proceeds to step S10.

[0044] If it is determined that the rotational primary component information does not meet the criteria (Step S9: NO), a correction process for the rotating body 9 is performed (Step S10). This correction process is performed by an operator. The operator corrects the rotating body 9 based on the unbalance information acquired from the information acquisition device 1. After the correction process (Step S10) is performed, each process from the balance measurement process (Step S2) onward is performed again. The correction process for the rotating body 9 is a process related to mass change and includes trial cutting, application of trial weights to the rotating body 9, and corrective machining of the rotating body 9.

[0045] Next, with reference to Figure 3, the details of the initial acquisition process of the influence coefficient (step S1) will be explained. In step S1, conditions for measuring specific vibration data necessary to calculate the influence coefficient are set, and the specific vibration data under those conditions is measured. The influence coefficient is the degree to which the change in mass of the rotating body 9 has an effect on the vibration of the rotating body 9. Processing related to the change in mass includes trial cutting of the rotating body 9, application of trial weights to the rotating body 9, and modification processing of the rotating body 9. In the initial acquisition process of the influence coefficient, a reference influence coefficient is calculated for a state where neither trial cutting nor application of trial weights has been performed. First, the condition number i corresponding to the conditions for measuring the specific vibration data is set to 3 (step S101). The conditions for measuring the specific vibration data are stored in advance in the storage unit 17.

[0046] The specific vibration data includes vibration displacement data. The specific vibration data may also include rotational pulse data. In step S1, the information acquisition device 1 acquires specific vibration data including vibration displacement data measured by displacement sensors 21 and 22, and rotational pulse data measured by rotational pulse sensor 23. The specific vibration data is defined based on the displacement (amplitude) indicated by the displacement data measured in step S200 and the phase indicated by the rotational pulse data. The specific vibration data is measured based on condition i. Condition i is defined by the elements "no trial cutting is performed, no trial weights are applied, and no cutting is performed by corrective machining, etc.", "driving force is applied", and "the rotational speed is specific". The specific rotational speed (per unit time) in condition i is, for example, a rotational speed that is equal to or greater than the set speed that can be set during steady-state operation.

[0047] Next, the information acquisition device 1 applies a driving force to the rotating body 9 based on the i-th condition (step S102). By applying a driving force to the rotating body 9 based on the i-th condition, the information acquisition device 1 causes the rotating body 9 to rotate at the rotational speed (per unit time) specified in the i-th condition. In step S102, as with the other processes of the balance measurement process (step S2) shown in Figure 5 later, no additional test cutting is performed on the rotating body 9. No additional test weights are applied in step S102. No corrective machining is performed in step S102. In step S102, a driving force is applied, and the rotational speed specified in the i-th condition is maintained after a predetermined time has elapsed. In step S102, the state is a forced rotation state. The rotational speed (per unit time) specified in the i-th condition is the rotational speed (per unit time) necessary for calculating the influence coefficient.

[0048] Next, a step (step S103) is performed to measure specific vibration data based on the i-th condition. Step S103 is performed by the displacement sensors 21 and 22, the rotation pulse sensor 23, and the information acquisition device 1. In step S103, the information acquisition device 1 acquires specific vibration data, including vibration displacement data measured by the displacement sensors 21 and 22, and rotation pulse data measured by the rotation pulse sensor 23. The specific vibration data is measured based on the i-th condition. The i-th condition is defined by the elements "no trial cutting is performed, no trial weights are applied, and no corrective machining is performed," "driving force is applied," and "it is one of the i-th rotational speeds among the specific rotational speeds." The third rotational speed in the third condition is set to a predetermined number of rotations per unit time. If i is 4 or greater, the i-th rotational speed is the number of rotations per unit time corresponding to the i-th condition. The i-th rotational speed is faster than the (i-1)th rotational speed. After step S103, a process to calculate rotational primary component information similar to step S31 described later may be performed.

[0049] Next, the information acquisition device 1 determines whether the set condition number has reached a predetermined value (step S104). The predetermined value is stored in the storage unit 17 beforehand. The predetermined value is, for example, 8. If the set condition number is equal to the predetermined value, it is determined that the set condition number has reached the predetermined value (step S104: YES), and the initial acquisition process of the influence coefficient proceeds to step S106. If the set condition number is less than the predetermined value, it is determined that the set condition number has not reached the predetermined value (step S104: NO), and the initial acquisition process of the influence coefficient proceeds to step S105.

[0050] If it is determined that the set condition number has not reached a predetermined value (step S104: NO), a process is executed to increase (add) the condition number i by 1 (step S105). Step S105 is executed by the information acquisition device 1. After step S105 is executed, the processes from step S102 onwards are executed again.

[0051] If it is determined that the set condition number has reached a predetermined value (step S104: YES), the influence coefficient is calculated (step S106). Step S106 is performed by the information acquisition device 1. When step S106 is completed, the initial acquisition process of the influence coefficient is completed.

[0052] Next, with reference to Figure 4, the details of the runout acquisition process (step S2) will be explained. First, the information acquisition device 1 determines whether or not runout information for the same rotating body already exists (step S201). Runout information for the same rotating body includes, for example, runout information calculated when the same rotating body is arranged in the same supercharger. If runout information for the same rotating body is already stored in the storage unit described later, it is determined that runout information for the same rotating body already exists (step S201: YES), and the runout acquisition process proceeds to step S12. If runout information for the same rotating body is not stored, it is determined that there is no runout information for the same rotating body (step S201: NO), and the runout acquisition process proceeds to step S13.

[0053] In step S201, if it is determined that runout information for the same rotating body already exists (step S201: YES), the information acquisition device 1 acquires the runout information from the storage unit (step S202). If runout information is acquired, the runout acquisition process (step S2) is terminated.

[0054] In step S201, if it is determined that there is no runout information for the same rotating body (step S201: NO), the information acquisition device 1 applies a predetermined driving force to the rotating body 9, causing the rotating body 9 to rotate at a predetermined rotational speed (step S203). In step S203, no test cutting is performed on the rotating body 9. In step S203, no test weights are applied. In step S203, no cutting by corrective machining is performed. Test cutting refers to, for example, cutting off parts of the rotating body 9 that need to be balanced (removing mass from the rotating body 9). Applying test weights refers to, for example, attaching weights of known mass and volume to the rotating body 9. Each of the following can change the balance and mass of the rotating body 9 and change the vibration of the rotating body 9. In step S203, a driving force is applied, and a predetermined rotational speed is maintained after a predetermined time has elapsed. In step S203, the state is a forced rotation state. The predetermined rotational speed may be, for example, a specific rotational speed. The specific rotational speed may be, for example, the rotational speed set for steady-state operation of the rotating body 9. When the rotational speed is the specific speed, the rotating body 9 is supported in a non-contact state by the journal bearings 93, 94 and the thrust bearing 95. In other words, the rotating body 9 is floating. Therefore, the specific rotational speed is higher than the floating rotational speed.

[0055] Next, the application of driving force to the rotating body 9 is stopped (step S204). The rotation of the rotating body 9 is stopped, for example, before the balance measurement process (step S3) is performed.

[0056] Next, low-frequency vibration data based on the first condition is measured (step S205). The runout acquisition process (step S2) includes the process of measuring low-frequency vibration data (step S205). Step S205 is performed by the displacement sensors 21 and 22, the rotation pulse sensor 23, and the information acquisition device 1. The low-frequency vibration data includes vibration displacement data. The low-frequency vibration data may also include rotation pulse data. In step S205, the information acquisition device 1 acquires low-frequency vibration data including vibration displacement data measured by the displacement sensors 21 and 22, and rotation pulse data measured by the rotation pulse sensor 23. The low-frequency vibration data is defined based on the displacement (amplitude) indicated by the vibration displacement data measured in step S205 and the phase indicated by the rotation pulse data. Unlike step S203, no driving force is always applied during the period in which the low-frequency vibration data is measured. As a result, the rotational speed gradually decreases over time. In other words, the state in step S205 can be said to be a free-rotation state (motor free-run state). Therefore, the first condition is defined by the elements that "no test cutting is performed, no test weights are applied, and no corrective machining is performed," "no driving force is applied," and "the rotational speed gradually decreases." After obtaining low-frequency vibration data, the rotation of the rotating body 9 is completely stopped. Note that the rotation of the rotating body 9 may be stopped during the execution of the next step S206.

[0057] The rotational speed when measuring low-frequency vibration data is lower than a specific rotational speed. In the following explanation, the rotational speed when measuring low-frequency vibration data will be referred to as the "low-frequency rotational speed." For example, the low-frequency rotational speed may be a value predetermined by prior preliminary tests. The low-frequency rotational speed may be lower than the primary critical rotational speed of the rotating body 9. If the levitation rotational speeds of the journal bearings 93 and 94 are known, a value close to the levitation rotational speed may be set as the low-frequency rotational speed. In other words, a value slightly higher than the levitation rotational speed may be set as the low-frequency rotational speed. A value equal to the levitation rotational speed may be set as the low-frequency rotational speed. A value slightly lower than the levitation rotational speed may be set as the low-frequency rotational speed. It is desirable that the low-frequency rotational speed be as low as possible. The rotational speed of the low-frequency rotational speed does not need to be constant, but it is desirable to avoid sudden changes in rotational speed. The low-frequency rotational speed should be as low as possible so that the rotating body 9 can rotate smoothly.

[0058] Next, runout information is calculated (S206). Step S206 is performed by the information acquisition device 1. The specific process for obtaining the runout information R performed by the information acquisition device 1 will be described later.

[0059] Next, with reference to Figure 5, the details of the balance measurement process (step S3) will be described. The balance measurement process (step S3) includes the steps of applying a driving force to the rotating body (step S21), measuring specific vibration data (step S30), and calculating rotational primary component information (step S31). At least a part of the process of calculating rotational primary component information (step S31) is performed while the step of measuring specific vibration data (step S30) is being performed.

[0060] First, a step is performed to apply driving force to the rotating body (step S301). The information acquisition device 1 controls the supercharger to apply driving force to the rotating body 9, so that the rotating body 9 rotates at a specific rotational speed. No test cutting is performed on the rotating body 9 in step S301. No test weights are applied in step S301. No cutting is performed by corrective machining in step S301. In the state of step S301, driving force is applied, and after a predetermined time has elapsed, one of the multiple specific rotational speeds is maintained. In this embodiment, in the state of step S301, driving force is applied, and after a predetermined time has elapsed, the lowest (slowest) specific rotational speed among the multiple specific rotational speeds is maintained. The state of step S301 can also be described as a forced rotation state.

[0061] Next, a step (step S30) for measuring specific vibration data is performed. Step S30 is performed by displacement sensors 21 and 22, a rotation pulse sensor 23, and an information acquisition device 1. The specific vibration data includes vibration displacement data. The specific vibration data may also include rotation pulse data. In step S30, the information acquisition device 1 acquires specific vibration data including vibration displacement data measured by displacement sensors 21 and 22, and rotation pulse data measured by the rotation pulse sensor 23. The specific vibration data is defined based on the displacement (amplitude) indicated by the displacement data measured in step S30 and the phase indicated by the rotation pulse data. The specific vibration data is measured based on a second condition. The second condition is defined by the elements of "no trial cutting is performed, no trial weights are applied, and no corrective machining is performed," "driving force is applied," and "the rotation speed is a specific speed." The specific rotation speed in step S3 is, for example, a rotation speed that is equal to or greater than a set speed that can be set during steady-state operation. The step of measuring specific vibration data (step S30) begins with the step of starting the measurement of specific vibration data (step S302) and is executed until the step of ending the measurement of specific vibration data (step S306).

[0062] Next, the step of calculating rotational primary component information (step S31) is performed. In step S31, the information acquisition device 1 measures specific vibration data. The calculation of rotational primary component information can be performed while the rotating body is rotating and while specific vibration data of the rotating body is being acquired. Details of the method for acquiring rotational primary component information will be described later. The step of calculating rotational primary component information (step S31) starts from the step of starting the calculation of rotational primary component information (step S303) and is performed until the step of ending the calculation of rotational primary component information (step S307).

[0063] Next, the information acquisition device 1 increases the speed of the rotating body 9 by applying a predetermined driving force to it (step S304). The rotating body 9 is brought into a state where it rotates at a predetermined rotational speed (step S304). No test cutting is performed on the rotating body 9 in step S304. No test weights are applied in step S304. No cutting by corrective machining is performed in step S304. In the state of step S304, a driving force is applied, and the predetermined rotational speed is maintained after a predetermined time has elapsed. The state of step S304 is a forced rotation state. The predetermined rotational speed may be, for example, one of a plurality of predetermined specific rotational speeds. The predetermined rotational speed may also be the completed rotational speed described later. In step S304, the information acquisition device 1 controls the supercharger to sequentially (discretely or continuously) increase the speed to a specific rotational speed faster than the specific rotational speed initially set in step S301, thereby rotating the rotating body 9 at a plurality of specific rotational speeds. While step S304 is being executed, the measurement process for specific vibration data (step S30) and the calculation process for rotational primary component information (step S31) are performed. Note that it is not necessary to increase the speed of the rotating body 9 in step S304, and the rotational speed of the rotating body 9 before step S305 may be the same as the rotational speed of the rotating body 9 in step S303. In other words, step S304 may be omitted.

[0064] Next, the information acquisition device 1 determines whether the rotational speed of the rotating body 9 has reached a predetermined completion rotational speed (step S305). If the rotational speed of the rotating body 9 is equal to or greater than the completion rotational speed, it is determined that the rotational speed of the rotating body 9 has reached the completion rotational speed (step S305: YES), and the process proceeds to step S306. If the rotational speed of the rotating body 9 is less than the completion rotational speed, it is determined that the rotational speed of the rotating body 9 has not reached the completion rotational speed (step S305: NO), and the process proceeds back to step S305.

[0065] Next, the measurement of specific vibration data is terminated (step S306). In step S306, the measurement processing by the displacement sensors 21 and 22, the rotation pulse sensor 23, and the information acquisition device 1 is terminated. Step S306 terminates the step of measuring specific vibration data (step S30). After step S30, in which the specific vibration data is measured, is completed, if in step S4 it is determined that the amount of specific vibration data is greater than or equal to a predetermined amount (step S4: YES), the influence coefficient can be newly acquired, and in step S5 the influence coefficient is newly calculated.

[0066] Next, the calculation of the rotational primary component information is completed (step S307). In step S307, the calculation process by the information acquisition device 1 is completed. Step S307 completes the step of calculating the rotational primary component information (step S31). This completes the balance measurement process (step S3).

[0067] As described above, in the rotating body correction method of this disclosure, the influence coefficient acquisition determination process (step S4) provides rotational primary component information for the state in which the rotating body 9 is rotated at multiple specific rotational speeds, both in the state in which no mass change process (correction process) is performed on the rotating body 9 to change its mass, and in the state in which a mass change process is performed to change the mass of the rotating body 9, before the step of calculating the influence coefficient (step S5) is executed. Each time the balance measurement process (S3) is executed, the influence coefficient acquisition determination process (step S4) determines whether or not to perform a test cut on the rotating body 9, whether or not to attach a test weight, and whether or not to perform a correction process. As a result, a test cut, attachment of a test weight, or correction process (cutting, etc.) can be performed on the rotating body 9 at at least one of the timings before or after the step of calculating the rotational primary component information in the balance measurement process (step S31) (before the start of the calculation of rotational primary component information (step S303), or after the end of the calculation of rotational primary component information (step S307)) (step S10). In other words, the balance measurement process (S3) is performed multiple times depending on the determination result (step S4: NO) of the rotational primary component information determination process (step S9). Alternatively, immediately after the determination of the influence coefficient (step S4), step S10, which corrects the rotating body, may be performed, and the balance measurement process (step S4) may be performed again.

[0068] The factors determined during trial cutting, application of trial weights, and modification machining include, for example, the amount of variation of at least one of the mass and volume, and the position of the variation. The position of the variation includes the angle with respect to the rotating body 9.

[0069] Thus, in the balance measurement process (step S3), at least two of the following (1) to (3) are performed for the effect coefficient calculation process (step S5). For the calculation of the effect coefficient, the balance measurement process (step S3) performs the following for the purpose of calculating the effect coefficient: (1) a process to calculate rotational first-order component information without performing mass change processing; (2) a process to calculate rotational first-order component information with mass change processing performed; or (3) a process to calculate rotational first-order component information with multiple variations in the amount of change due to mass change processing.

[0070] Furthermore, no mass change processing is performed on the rotating body 9 during the execution of the step (step S31) for calculating rotational primary component information in the balance measurement process (S3) (from the start of the calculation of rotational primary component information (step S303) to the end of the calculation of rotational primary component information (step S307)).

[0071] [Information Acquisition Device] Next, the information acquisition device 1 will be described. The information acquisition system 100 shown in Figure 6 acquires vibration data V Ｎ The vibration displacement data d and rotational pulse data P that constitute the system are measured, and the rotational primary component information V is measured. Ｆ The system acquires the unbalance information m. The information acquisition system 100 includes displacement sensors 21 and 22, a rotation pulse sensor 23, and an information acquisition device 1.

[0072] The displacement sensors 21, 22 and the rotation pulse sensor 23 are examples of the first and second measurement units. The first and second measurement units use the same displacement sensors 21, 22 and rotation pulse sensor 23. The displacement sensors 21 and 22 measure vibration displacement data d as the displacement (amplitude) of the shaft 90. The displacement sensors 21 and 22 are provided without contacting either end of the shaft 90. The rotation pulse sensor 23 measures rotation pulse data P as the phase of the shaft 90. The rotation pulse sensor 23 is provided without contacting one end of the shaft 90.

[0073] The information acquisition device 1 acquires rotational primary component information V based on vibration displacement data d and rotational pulse data P. Ｆ A program is executed that defines a series of processes for acquiring the information. This program may also define a series of processes for acquiring unbalance information m. As a result, several functional components constituting the information acquisition device 1 are realized.

[0074] The information acquisition device 1 is a computer composed of hardware such as a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), and software such as a program stored in the ROM. The information acquisition device 1 executes a rotating body correction method that includes an information acquisition method. The information acquisition device 1 may also perform control other than measurement, calculation, acquisition, and storage of information related to the rotating body 9. The information acquisition device 1 may also perform control of a supercharger that includes the rotating body 9.

[0075] As shown in Figure 6, the information acquisition device 1 acquires vibration displacement data d from displacement sensors 21 and 22. The information acquisition device 1 acquires rotational pulse data P from rotational pulse sensor 23. Based on the vibration displacement data d and rotational pulse data P, the information acquisition device 1 generates rotational primary component information V Ｆ The information acquisition device 1 calculates the rotational primary component information V. Ｆ The information is presented to the worker. In this embodiment, the information acquisition device 1 calculates unbalance information m based on vibration displacement data d and rotation pulse data P.

[0076] The information acquisition device 1 comprises, as functional components, an acquisition unit 10, a storage unit 17, an output unit 18, and a rotation control unit 19. The storage unit 17 stores various types of data. The storage unit 17 acquires data from the acquisition unit 10. The storage unit 17 stores the data it has stored in a manner that allows it to be transmitted to the acquisition unit 10 in response to requests from the functional components. The output unit 18 outputs the data acquired by the acquisition unit 10. The output unit 18 may be, for example, a display device such as a display, or a notification device such as a speaker.

[0077] The rotation control unit 19 controls the rotation of a rotating body 9 provided in a rotating machine such as a supercharger. The rotation control unit 19 executes applying a driving force to the rotating body 9 and stopping the application of the driving force to the rotating body 9. As an example of applying a driving force to the rotating body 9, the rotation control unit 19 controls the driving force applied so that the rotation of the rotating body 9 can be accelerated and decelerated. The rotation control unit 19 executes steps S2, S3, S8 shown in the flowchart of FIG. 2, step S102 shown in the flowchart of FIG. 3, steps S203, S204 shown in the flowchart of FIG. 4, and steps S301, S304 shown in the flowchart of FIG. 5.

[0078] The acquisition unit 10 includes a vibration data acquisition unit 11, a runout information acquisition unit 12, a rotational primary component information acquisition unit 13, a determination unit 14, an influence coefficient acquisition unit 15, and an imbalance information acquisition unit 16. Each functional component of the acquisition unit 10 is realized by executing a predetermined program. The plurality of functional components may exchange data with each other. The plurality of functional components may indirectly exchange data via the storage unit 17 without exchanging data with each other.

[0079] The vibration data acquisition unit 11 acquires vibration displacement data d and rotation pulse data P as vibration data V Ｎ The vibration data acquisition unit 11 acquires the vibration displacement data d from the displacement sensors 21 and 22. The vibration data acquisition unit 11 may acquire the vibration displacement data d stored in the storage unit 17 from the storage unit 17. The vibration data acquisition unit 11 acquires the rotation pulse data P from the rotation pulse sensor 23. The vibration data acquisition unit 11 may acquire the rotation pulse data P stored in the storage unit 17 from the storage unit 17. The vibration data acquisition unit 11 outputs the vibration data V Ｎ to the rotational primary component information acquisition unit 13 and the influence coefficient acquisition unit 15. The vibration data acquisition unit 11 may output and store the vibration data V Ｎ in the storage unit 17. When the runout information R is not stored in the storage unit 17, the vibration data acquisition unit 11 outputs the vibration data V ＮThe vibration data acquisition unit 11 outputs the following: steps S1, S2, S3 shown in the flowchart of Figure 2, steps S103, S15 shown in the flowchart of Figure 3, step S205 shown in the flowchart of Figure 4, and step S30 shown in the flowchart of Figure 5.

[0080] Vibration Data V Ｎ This is the low-frequency vibration data V acquired in step S205. ＮＬ , and the specific vibration data V acquired in step S30 ＮＳ This includes: Vibration displacement data d is data where time and displacement are associated. Rotation pulse data P is data where time and phase are associated. Vibration data V Ｎ This is defined based on the displacement (amplitude) shown by the vibration displacement data d and the phase shown by the rotation pulse data P.

[0081] The runout information acquisition unit 12 acquires runout information R. If the runout information acquisition unit 12 determines that runout information R is stored in the storage unit 17, the runout information acquisition unit 12 acquires runout information R from the storage unit 17. If the runout information acquisition unit 12 determines that runout information R is not stored in the storage unit 17, the runout information acquisition unit 12 acquires low-frequency vibration data from the vibration data acquisition unit 11. The runout information acquisition unit 12 calculates runout information R based on the low-frequency vibration data. The runout information acquisition unit 12 outputs runout information R to the rotational primary component information acquisition unit 13. The runout information acquisition unit 12 may also output runout information R to the storage unit 17. The runout information acquisition unit 12 executes step S2 shown in the flowchart of Figure 2, and steps S201, S202, and S206 shown in the flowchart of Figure 3.

[0082] The runout information acquisition unit 12 acquires, for example, low-frequency vibration data V when the rotational speed is low. ＮＬThis itself may be considered as runout information R. Figure 7 is a diagram showing the vibration when the rotational speed gradually decreases from a specific rotational speed. Vibration data can be displayed using imaginary numbers. In Figure 7, the horizontal axis represents real numbers, and the vertical axis represents imaginary numbers. Vibration when rotating at a certain rotational speed can be represented as a point on the first trajectory T1. A vector is defined connecting the point on the first trajectory T1 and the origin. The length of the vector represents the amplitude of the vibration. The angle of the vector represents the phase of the vibration.

[0083] For example, suppose the vibration when rotating at a certain rotational speed is represented by point W0. In this case, the vibration data V Ｎ This can be expressed by the length of vector W1 and the angle (phase) of vector W1. The vibration data V represented by vector W1 Ｎ This includes components resulting from dynamic imbalance and components resulting from runout. Referring to Figure 7, the vibration data V Ｎ The vector W1 shown is the sum of a vector component W1a caused by dynamic unbalance and a vector component W1b caused by runout. The magnitude (amplitude of vibration) and phase of the vector component W1a caused by dynamic unbalance change with the rotational speed. On the other hand, the magnitude and phase of the vector component W1b caused by runout are not affected by the rotational speed. The magnitude and phase of the vector component W1b caused by runout are always constant.

[0084] As the rotational speed decreases, the first trajectory T1 converges toward point W2. Point W2 represents the true runout. However, in reality, the first trajectory T1 never reaches point W2. This is because the rotating body 9 is supported by non-contact journal bearings 93 and 94, and in the region below the levitation speed, the shaft 90 comes into contact with the journal bearings 93 and 94. This contact causes a change in the vibration state of the rotating body 9. The change in the vibration state of the rotating body 9 is shown by the second trajectory T2.

[0085] Therefore, we define the point W4 where the first trajectory T1 switches to the second trajectory T2 as a discontinuity point. Then, we obtain vibration data (low-frequency vibration data V) at rotational speeds near the discontinuity point. ＮＬThis is treated as runout information R. Even by determining the runout information R in this way, it is possible to obtain sufficiently effective results for correcting the dynamic balance.

[0086] For example, low-frequency vibration data V ＮＬ Each time a result is obtained, the rotational speed of the point to be selected as the runout may be determined by drawing the diagram shown in Figure 7. When performing balance correction on multiple rotating bodies 9, the rotational speed of the point to be selected as the runout is determined for one of the rotating bodies 9 by drawing the diagram shown in Figure 7. Then, for another rotating body 9, the already determined rotational speed is used as the low-frequency rotational speed, and vibration data V corresponding to that rotational speed is obtained. Ｎ Runout information R may be obtained from this source.

[0087] The rotational primary component information acquisition unit 13 receives vibration data V from the vibration data acquisition unit 11. Ｎ Among them, specific vibration data V ＮＳ The unit acquires the runout information R from the runout information acquisition unit 12. The rotational primary component information acquisition unit 13 acquires the specific vibration data V ＮＳ The runout information R may also be obtained from the storage unit 17. The unbalance information acquisition unit 16 acquires specific vibration data V ＮＳ And rotational primary component information V based on runout information R Ｆ The rotational primary component information acquisition unit 13 acquires the rotational primary component information V. Ｆ It outputs the following. For example, the rotational primary component information acquisition unit 13 outputs the rotational primary component information V Ｆ The rotational primary component information acquisition unit 13 may output the rotational primary component information V to the output unit 18. Ｆ This may be displayed. The rotational primary component information acquisition unit 13 executes step S3 shown in the flowchart of Figure 2 and step S31 shown in the flowchart of Figure 4.

[0088] Vibration Data V Ｎ Among them, specific vibration data V ＮＳ Runout information R and rotational first-order component information V Ｆ V is defined by the following equation (1). In equation (1), V ＮＳ , R, V ＦV represents a vector. ＮＳ = V Ｆ +R...(1)

[0089] Equation (1) includes three elements: Specific vibration data V ＮＳ The runout information R is known. Rotational first-order component information V Ｆ V is an unknown variable. Therefore, the specific vibration data V is added to equation (1). ＮＳ And by applying runout information R, the rotational first-order component information V Ｆ You can obtain this.

[0090] The determination unit 14 uses the rotational primary component information V calculated by the rotational primary component information acquisition unit 13. Ｆ The determination unit 14 determines whether or not it meets predetermined criteria. Ｆ However, if it is below the predetermined standard value, the rotational primary component information V Ｆ The determination unit 14 determines that the criteria are met. Ｆ However, if it is above a predetermined standard value, the rotational primary component information V Ｆ The determination unit 14 determines that the standard is not met. The standard value may be the value that must be met in the shipping standards for the rotating body 9 and the supercharger including the rotating body 9. The determination unit 14 executes steps S4 and S9 shown in the flowchart of Figure 2.

[0091] The influence coefficient acquisition unit 15 receives vibration data V from the vibration data acquisition unit 11. Ｎ Among them, specific vibration data V ＮＳ The influence coefficient acquisition unit 15 obtains vibration data V from the storage unit 17. Ｎ Among them, specific vibration data V ＮＳ The influence coefficient acquisition unit 15 may acquire the vibration data V. Ｎ Among them, specific vibration data V ＮＳ It is determined whether or not a predetermined amount or more of the specific vibration data V has been acquired (step S4). The influence coefficient acquisition unit 15 determines whether or not a predetermined amount or more of the specific vibration data V ＮＳ If it is determined that the amount of data V exceeds a predetermined amount, it is determined that the influence coefficient α can be newly calculated. The influence coefficient acquisition unit 15 determines that the amount of data V ＮＳIf it is determined that the amount of data is less than a predetermined amount, it is determined that the influence coefficient α cannot be newly calculated. The influence coefficient acquisition unit 15 determines that the amount of data of the specific vibration data V ＮＳ If it is determined that the amount of data exceeds a predetermined amount, vibration data V Ｎ Among them, specific vibration data V ＮＳ The influence coefficient α is calculated based on the following. The influence coefficient acquisition unit 15 outputs the influence coefficient α to the unbalance information acquisition unit 16. The influence coefficient acquisition unit 15 may also output the influence coefficient α to the storage unit 17. The influence coefficient acquisition unit 15 executes steps S1, S5, S6 shown in the flowchart of Figure 2, and steps S101, S104, S105, S106 shown in the flowchart of Figure 3. Note that the vibration data V Ｎ Among them, specific vibration data V ＮＳ The function of determining whether or not a predetermined amount of the influence coefficient has been acquired may be performed by the determination unit 14 instead of the influence coefficient acquisition unit 15. ＮＳ If it is determined that the amount of data is less than a predetermined amount, the influence coefficient acquisition unit 15 acquires the influence coefficient that has already been calculated (step S6).

[0092] The influence coefficient acquisition unit 15 acquires multiple specific vibration data V obtained under different rotation conditions in a rotating body 9 that has not undergone trial cutting, application of trial weights, or modification processing. ＮＳ Based on this, the influence coefficient α is calculated (step S1). For the calculation of the influence coefficient in the influence coefficient acquisition unit 15, known methods may be used. The influence coefficient acquisition unit 15 may also calculate the influence coefficient based on specific vibration data obtained from a rotating body 9 that has not undergone mass change processing and specific vibration data obtained from a rotating body 9 that has undergone mass change processing (step S5), and known methods may be used for this processing. The specific vibration data obtained from a rotating body 9 that has undergone mass change processing is specific vibration data obtained from a rotating body 9 that has undergone at least one of trial cutting, application of trial weights, and modification processing.

[0093] The unbalance information acquisition unit 16 receives rotational primary component information V from the rotational primary component information acquisition unit 13. ＦThe unbalance information acquisition unit 16 acquires the rotational first-order component information V Ｆ The influence coefficient α may also be obtained from the storage unit 17. The unbalance information acquisition unit 16 acquires rotational primary component information V Ｆ The unbalance information acquisition unit 16 acquires unbalance information m based on the influence coefficient α. The unbalance information acquisition unit 16 performs step S7 shown in the flowchart of Figure 2. The unbalance information acquisition unit 16 outputs unbalance information m. For example, the unbalance information acquisition unit 16 may output unbalance information m to the storage unit 17. The unbalance information acquisition unit 16 may display unbalance information m via the output unit 18 that constitutes the information acquisition device 1. An example of the output unit 18 is a display.

[0094] Rotational primary component information V Ｆ The influence coefficient α and imbalance information m are defined by the following equation (2). In equation (2), V and m represent vectors, and α represents a matrix. Ｆ = αm ... (2)

[0095] Equation (2) contains three elements: Rotational linear component information V Ｆ The influence coefficient α is known. The imbalance information m is unknown. Therefore, the rotational first-order component information V is added to equation (2). Ｆ By applying the influence coefficient α, imbalance information m can be obtained. The imbalance information acquisition unit 16 may acquire balance correction information that includes a concept for reducing the imbalance information m. For example, the balance correction information may include a concept for setting the imbalance information m to zero.

[0096] Incidentally, in some cases, it is not possible to remove the rotating body 9 from a rotating machine that includes a rotating body 9 without disassembling it. In such cases, the balance of the rotating body 9 is corrected while it is assembled to a stationary structure. At that time, vibration data is generally obtained from sensors installed in the stationary structure. However, especially when the rotating body 9 is supported by a non-contact type gas bearing, the vibration data from the stationary structure may not be able to calculate rotational primary component information with sufficient accuracy. Therefore, a non-contact displacement sensor is used to measure the vibration of the rotating body 9. The vibration data measured by the non-contact displacement sensor includes not only the vibration component of the rotating body but also the runout of the vibration measurement unit. The runout of the vibration measurement unit includes mechanical runout and electromagnetic runout. Therefore, when acquiring rotational primary component information and unbalance information based on the vibration measurement results obtained by the non-contact displacement sensor, it is necessary to identify not only the unbalance but also the runout. To identify the unbalance and runout, vibration data of two or more rotational speeds is used.

[0097] In high-speed rotating machinery where the rotating body 9 is supported by gas bearings, a gas film does not form at low rotational speeds, making continuous operation impossible. Furthermore, vibration data acquired when the rotating body 9 is not sufficiently levitated cannot be used to identify unbalance. The levitation speed is often relatively high. Therefore, attempting to identify unbalance and runout using vibration data acquired at speeds above the levitation speed may not yield sufficient accuracy in identifying runout.

[0098] Rotational primary component information V of this disclosure Ｆ The method for obtaining and the information acquisition device 1 were developed in view of the above-mentioned problems.

[0099] [Effects and Effects]

[0100] An information acquisition method relating to one aspect of this disclosure is a method for acquiring information about a rotating body 9 that is rotatably supported by journal bearings 93, 94 (an example of a non-contact type bearing) and rotates about a rotation axis A, wherein the method acquires low-frequency vibration data V along the direction intersecting the rotation axis A when the rotating body 9 is rotating at a low-frequency rotation speed lower than a specific rotation speed. ＮＬStep S205 to measure (an example of a step to acquire low-frequency vibration data), and low-frequency vibration data V ＮＬ Based on this, steps S2 and S206 calculate runout information R which indicates the degree of runout caused by the shape of the rotating body 9, and specific vibration data V along the direction intersecting the rotation axis A when the rotating body 9 is rotating at a specific rotational speed. ＮＳ Step S30 involves measuring runout information R and specific vibration data V. ＮＳ Based on this, the rotational primary component information V of the rotating body 9 Ｆ Step S31, which includes calculating the value.

[0101] An information acquisition device 1 relating to one aspect of this disclosure is an information acquisition device 1 relating to a rotating body 9 that is rotatably supported by journal bearings 93, 94 (an example of a non-contact type bearing) and rotates about a rotation axis A, and acquires low-frequency vibration data V along the direction intersecting the rotation axis A when the rotating body 9 is rotating at a low-frequency rotation speed lower than a specific rotation speed. ＮＬ Displacement sensors 21, 22 and a rotation pulse sensor 23 (an example of an acquisition unit) that measure the low-frequency vibration data V ＮＬ Based on this, a runout information acquisition unit 12 calculates runout information R indicating the degree of runout caused by the shape of the rotating body 9, and specific vibration data V along the direction intersecting the rotation axis A when the rotating body 9 is rotating at a specific rotational speed. ＮＳ Displacement sensors 21, 22 and a rotation pulse sensor 23 (an example of a measurement unit) that measure runout information R and specific vibration data V ＮＳ Based on this, the rotational primary component information V of the rotating body 9 Ｆ It includes a rotational primary component information acquisition unit 13 that calculates the following:

[0102] In this information acquisition method and information acquisition device 1, when the rotating body 9 is rotating at a low-frequency rotation speed lower than a specific rotation speed, low-frequency vibration data V along the direction intersecting the rotation axis A is obtained. ＮＬ Based on this, runout information R is calculated. This allows for rotational first-order component information V with fewer unknowns than before. Ｆ This can be obtained. Rotational linear component information V Ｆis information including vibration components due to dynamic imbalance. Thus, vibration components due to dynamic imbalance can be easily obtained. Also, it is executed without performing mass change processing on the rotating body 9 while measuring the low-frequency vibration data and while measuring the specific vibration data.

[0103] The information acquisition method is after the step S205 of measuring the low-frequency vibration data V ＮＬ and may further include a step of stopping the rotation of the rotating body 9 before the step S30 of measuring the specific vibration data V ＮＳ . In the present embodiment, after the step (S204) of stopping the application of the driving force to the rotating body 9, a step of stopping the rotation of the rotating body 9 can be executed before the step S30 of measuring the specific vibration data V ＮＳ . In this case, the specific vibration data V ＮＬ is measured after the measurement of the low-frequency vibration data V ＮＳ ends. In step S2 of calculating the runout information R, in a state where the runout information R can be calculated or in a state where the runout information R has already been calculated, the step S3 (S1) of measuring the specific vibration data V ＮＳ can be executed, so that a smooth transition can be made to step S31 of calculating the rotational primary component information V Ｆ .

[0104] In the information acquisition method, step S31 of calculating the rotational primary component information V Ｆ may be started while step S30 of measuring the specific vibration data V ＮＳ is being executed. In this case, when at least a part of the measured specific vibration data V ＮＳ is measured, based on the specific vibration data V ＮＳ and the known runout information R, the rotational primary component information V Ｆ can be calculated. Therefore, the rotational primary component information V Ｆ can be efficiently acquired.

[0105] In the information acquisition method, the specific vibration data V ＮＳIn step S30 of measuring, the rotating body 9 is accelerated to a plurality of specific rotational speeds, and specific vibration data V corresponding to each of the plurality of specific rotational speeds is measured. ＮＳ In step S31 of calculating the rotational primary component information V, Ｆ while the rotating body 9 is being accelerated, the rotational primary component information V corresponding to at least one of the plurality of specific rotational speeds may be calculated. In this case, since the specific vibration data V corresponding to each of the plurality of specific rotational speeds is measured, the specific vibration data V is calculated using a previously measured specific rotational speed different from the measured specific rotational speed, and based on the known runout information R, the rotational primary component information V Ｆ can be calculated. Therefore, the rotational primary component information V ＮＳ can be efficiently obtained. Regarding the relationship between the acceleration of the rotating body 9 and the measurement of the specific vibration data V, ＮＳ it is not limited to the form of discretely changing (accelerating) to a plurality of specific rotational speeds and measuring the specific vibration data V for the plurality of specific rotational speeds, and may include the form of continuously changing (accelerating) the rotating body 9 to a certain predetermined rotational speed and continuously measuring the specific vibration data V. Ｆ The information acquisition device 1 may obtain the specific vibration data V for the plurality of specific rotational speeds by discrete or continuous acceleration, regardless of the presence or absence of at least one of the trial shaving and the trial weight application. Ｆ ＮＳ In the information acquisition method, in steps S1 and S3 of measuring the specific vibration data V and in the calculation process of the influence coefficient (step S5), with respect to each of the state where the mass change process of changing the mass of the rotating body 9 is not performed and the state where the mass change process of changing the mass of the rotating body 9 is performed, the rotating body 9 is rotated at a plurality of specific rotational speeds, and the specific vibration data V corresponding to each of the plurality of specific rotational speeds is measured. As steps S5 and S106 of calculating the influence coefficient α, the specific vibration data V ＮＳ ＮＳ ＮＳ

[0106] In the information acquisition method, in steps S1 and S3 of measuring the specific vibration data V and in the calculation process of the influence coefficient (step S5), with respect to each of the state where the mass change process of changing the mass of the rotating body 9 is not performed and the state where the mass change process of changing the mass of the rotating body 9 is performed, the rotating body 9 is rotated at a plurality of specific rotational speeds, and the specific vibration data V corresponding to each of the plurality of specific rotational speeds is measured. As steps S5 and S106 of calculating the influence coefficient α, the specific vibration data V ＮＳ ＮＳ ＮＳThe step S5 may further include calculating an influence coefficient α that indicates the degree to which the mass change process has an effect on the vibration of the rotating body 9. In this case, the rotational first-order component information V is obtained with fewer unknowns than in the conventional method. Ｆ Because this can be obtained, the influence coefficient α can be obtained with a small number of measurement data. Therefore, a highly accurate influence coefficient α based on runout information R can be easily obtained with a small amount of measurement data.

[0107] The method for obtaining information is rotational linear component information V Ｆ The method may further include step S7, which calculates unbalance information m based on the influence coefficient α. In this case, the rotational first-order component information V is obtained with fewer unknowns than in the conventional method. Ｆ Because this can be obtained, unbalance information m can be obtained with a small amount of measurement data. Therefore, highly accurate unbalance information m based on runout information R can be easily obtained with a small amount of measurement data.

[0108] [Variations] The above describes examples of information acquisition methods and information acquisition devices. Information acquisition methods and information acquisition devices may be implemented in various forms, without being limited to the examples above.

[0109] For example, the information acquisition method is rotational linear component information V Ｆ Step S9 further includes determining whether the criteria are met, and step S7 calculates the unbalance information m, in which step S9 determines the rotational primary component information V Ｆ It may be calculated if the criteria are met. In this case, the rotational linear component information V Ｆ The condition that the criteria are met is, for example, when it is suggested that the unbalance of the rotating body 9 should be corrected. This makes it easy to determine whether or not the unbalance of the rotating body 9 needs to be corrected.

[0110] For example, the information acquisition method is rotational linear component information V Ｆ A step to determine whether or not it is above a threshold, and in the step to determine, rotational linear component information V ＦThe step may further include stopping the rotation of the rotating body 9 if it is determined that the rotational primary component information V is above a threshold. Ｆ If the value is determined to be above the standard value, for example, it suggests that the unbalance of the rotating body 9 is excessive. In such cases, stopping the rotation of the rotating body 9 allows for efficient maintenance of the rotating body 9.

[0111] For example, in the information acquisition method, if runout information R for the same rotating body 9 already exists (step S201: YES), low-frequency vibration data V ＮＬ Step S205, which measures the runout information R, and step S206, which calculates the runout information R, are not performed. That is, if runout information R for the same rotating body 9 already exists (step S201: YES), the information acquisition method is performed by obtaining specific vibration data V ＮＳ Step S30 to measure and rotational primary component information V Ｆ Only step S31, which calculates the first-order rotational component V, may be performed. In this case, vibration components due to dynamic unbalance can be easily obtained based on known runout information. As a result, specific vibration data is measured when the rotating body 9 is rotated at a specific rotational speed, and rotational first-order component information V is obtained. Ｆ Therefore, when the rotating body 9 is rotating at a specific rotational speed, or shortly after the rotation at the specific rotational speed has finished, the rotational primary component information V is calculated. Ｆ Rotational linear component information V can be obtained. Ｆ Based on this, the determination of whether the rotating body 9 can be modified and the inspection can be performed, so this information acquisition method and information acquisition device 1 can perform the determination of whether the rotating body 9 can be modified and the inspection more efficiently.

[0112] For example, in the information acquisition method, low-frequency vibration data V ＮＬ Step S205, which measures the specific vibration data V, and Step S206, which calculates the runout information R, are performed by the specific vibration data V. ＮＳ This may be performed before and after step S30, which measures the specific vibration data V. ＮＳSince runout information R is acquired at both the time before and after measurement, highly accurate runout information can be obtained, and the runout information R can be updated. Note that specific vibration data V ＮＳ Runout information acquired after measurement, and specific vibration data V ＮＳ If the runout information acquired before the measurement is the same as or falls within a predetermined range, then the specific vibration data V ＮＳ The runout information obtained after the measurement may be updated. Specific vibration data V ＮＳ Runout information acquired after measurement, and specific vibration data V ＮＳ The average value of the runout information obtained before the measurement may be used as the runout information R.

[0113] Also, for example, specific vibration data V ＮＳ Before step S30, which measures the low-frequency vibration data V, if runout information R for the same rotating body 9 already exists (step S201: YES), ＮＬ Step S205, which measures the specific vibration data V, and Step S206, which calculates the runout information R, are performed by the specific vibration data V. ＮＳ Step S30, which measures the specific vibration data V, is not performed before this step. ＮＳ This may be performed after step S30, which measures the specific vibration data V. ＮＳ Since runout information R can be obtained by utilizing the stopping of rotation of the rotating body 9 after rotation in step S30, which measures the runout information R, the runout information R can be updated. Furthermore, based on the operating time of the rotating body 9, low-frequency vibration data V ＮＬ The steps of obtaining the specific vibration data V (S205) and calculating runout information (S206) are performed by the specific vibration data V ＮＳ The step of measuring (S30) may be performed at least before and after the step of measuring (S30). For example, if the operating time of the rotating body 9 is shorter than a predetermined time, the step of acquiring low-frequency vibration data (S205) and the step of calculating runout information R (S206) may be performed to obtain specific vibration data V ＮＳ This may be performed after the step of measuring (S30).

[0114] For example, in an information acquisition method, rotational linear component information V Ｆ Step S31, which calculates the specific vibration data V, may be performed after each of the two runout information R steps S206. That is, step S206, which calculates the runout information R, may be performed after each of the two runout information R steps S206. ＮＳ When performed before and after step S30, which measures the rotational primary component information V Ｆ Step S31 for calculating the two runout information R may be performed after step S206 for calculating the two runout information R. In this case, the rotational first-order component information V Ｆ This allows the latest runout information R to be reflected. Therefore, according to this information acquisition method, highly accurate rotational primary component information V can be obtained. Ｆ You can obtain it.

[0115] For example, in the determination unit 14, rotational primary component information V Ｆ If it is determined that the criteria are not met, the influence coefficient acquisition unit 15 may calculate the influence coefficient α. In this case, the influence coefficient calculation process does not have to be included in the balance measurement process (step S2). Also in this case, in step S9, the rotational primary component information V Ｆ If it is determined that the criteria are not met (Step S9: NO), the calculation of the influence coefficient may be performed before the modification process of the rotating body 9 (Step S10).

[0116] For example, the modification process of the rotating body 9 (step S10) may involve a change in mass that alters the rotational balance of the rotating body 9. The modification process of the rotating body 9 (step S10) may include at least one of the following: altering the rotational balance by grinding down the rotating body 9, and adding a test weight.

[0117] For example, if the rotating body 9 is a machine integrated with a drive mechanism such as a motor, in step S1, operation may be performed at an extremely low speed for a short period of time to obtain vibration data for runout information.

[0118] For example, if the rotating body 9 is a machine that is not integrated with a drive mechanism such as a motor, in step S13, a motor may be temporarily connected. Then, operation may be performed at an extremely low speed for a short period of time to obtain vibration data for runout information.

[0119] [Note] The information acquisition method and information acquisition device include the following configuration.

[0120] This disclosure includes: [1] "A method for acquiring information about a rotating body that is rotatably supported by a non-contact bearing and rotates about a rotation axis, comprising: acquiring low-frequency vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a low-frequency rotation speed lower than a specific rotation speed; calculating runout information indicating the degree of runout caused by the shape of the rotating body based on the low-frequency vibration data; measuring specific vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a specific rotation speed; and calculating primary rotation component information of the rotating body based on the runout information and the specific vibration data."

[0121] This disclosure is [2] "the information acquisition method described in [1] above, wherein the step of acquiring the information comprises measuring the low-frequency vibration data, and the steps of acquiring the low-frequency vibration data and calculating runout information are performed at least one before and after the step of measuring the specific vibration data."

[0122] This disclosure includes [3] "the information acquisition method described in [2] above, wherein the step of calculating the rotational primary component information is performed after the step of calculating the two runout information."

[0123] This disclosure is [4] "an information acquisition method according to any one of [1] to [3] above, further comprising the step of measuring the low-frequency vibration data in the acquisition step, and stopping the rotation of the rotating body after the step of acquiring the low-frequency vibration data and before the step of measuring the specific vibration data."

[0124] This disclosure includes [5] "the information acquisition method according to any one of [1] to [4] above, wherein the step of calculating the rotational primary component information is started while the step of measuring the specific vibration data is being performed."

[0125] This disclosure is [6] "an information acquisition method according to any one of [1] to [5] above, wherein in the step of measuring the specific vibration data, the rotating body is accelerated to a plurality of specific rotational speeds, the specific vibration data corresponding to each of the plurality of specific rotational speeds is measured, and in the step of calculating the rotational primary component information, the rotational primary component information corresponding to at least one of the plurality of specific rotational speeds is calculated while the rotating body is being accelerated."

[0126] The present disclosure is [7] "an information acquisition method according to any one of [1] to [6] above, further comprising the step of measuring the specific vibration data, in which the rotating body is rotated at a plurality of specific rotational speeds in a state in which no mass change processing is performed to change the mass of the rotating body, and in a state in which a mass change processing is performed to change the mass of the rotating body, the specific vibration data corresponding to each of the plurality of specific rotational speeds is measured, and an influence coefficient indicating the degree of influence of the mass change processing on the vibration of the rotating body is calculated based on the specific vibration data."

[0127] This disclosure is [8] "the information acquisition method according to [7] above, further comprising the step of calculating unbalance information based on the rotational primary component information and the influence coefficient."

[0128] This disclosure further includes [9] "the information acquisition method described in [8] above, which further includes the step of determining whether the rotational primary component information satisfies a criterion, wherein the step of calculating the imbalance information is calculated in the determination step if the rotational primary component information satisfies a criterion."

[0129] This disclosure is

[10] "an information acquisition method according to any one of [1] to [9] above, further comprising the steps of determining whether the rotational primary component information is equal to or greater than a reference value, and stopping the rotation of the rotating body if it is determined in the determination step that the rotational primary component information is equal to or greater than the reference value."

[0130] This disclosure is

[11] "an information acquisition device for a rotating body that is rotatably supported by a non-contact bearing and rotates about a rotation axis, comprising: an acquisition unit that acquires low-frequency vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a low-frequency rotation speed lower than a specific rotation speed; a first calculation unit that calculates runout information indicating the degree of runout caused by the shape of the rotating body based on the low-frequency vibration data; a measurement unit that measures specific vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a specific rotation speed; and a second calculation unit that calculates the primary rotation component of the rotating body based on the runout information and the specific vibration data."

[0131] 1 Information acquisition device 9 Rotating body 10 Acquisition unit 11 Vibration data acquisition unit 12 Runout information acquisition unit 13 Rotational primary component information acquisition unit 14 Judgment unit 15 Influence coefficient acquisition unit 16 Unbalance information acquisition unit 17 Storage unit 18 Output unit 19 Rotation control unit 21, 22 Displacement sensor 23 Rotational pulse sensor 90 Shaft 91, 92 Impeller 93, 94 Journal bearing 95 Thrust bearing 96 Thrust collar 100 Information acquisition system d Vibration displacement data m Unbalance information P Rotational pulse data R Runout information V Ｆ Rotational first-order component information V Ｎ Vibration data V ＮＬ Low-frequency vibration data V ＮＳ Specific vibration data α influence coefficient

Claims

1. A method for acquiring information about a rotating body that is rotatably supported by a non-contact bearing and rotates about a rotation axis, comprising: a step of acquiring low-frequency vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a low-frequency rotation speed lower than a specific rotation speed; a step of calculating runout information indicating the degree of runout caused by the shape of the rotating body based on the low-frequency vibration data; a step of measuring specific vibration data along a direction intersecting the rotation axis when the rotating body is rotating at the specific rotation speed; and a step of calculating rotational primary component information of the rotating body based on the runout information and the specific vibration data.

2. The information acquisition method according to claim 1, wherein the acquisition step involves measuring the low-frequency vibration data, and the step of acquiring the low-frequency vibration data and the step of calculating the runout information are performed at least one before and after the step of measuring the specific vibration data.

3. The information acquisition method according to claim 2, wherein the step of calculating the rotational primary component information is performed after the step of calculating the two runout information items.

4. The information acquisition method according to any one of claims 1 to 3, further comprising the step of measuring the low-frequency vibration data in the acquisition step, and the step of stopping the rotation of the rotating body after the step of acquiring the low-frequency vibration data and before the step of measuring the specific vibration data.

5. The information acquisition method according to any one of claims 1 to 3, wherein the step of calculating the rotational primary component information is started while the step of measuring the specific vibration data is being performed.

6. The information acquisition method according to any one of claims 1 to 3, wherein in the step of measuring the specific vibration data, the rotating body is accelerated to a plurality of specific rotational speeds, and the specific vibration data corresponding to each of the plurality of specific rotational speeds is measured, and in the step of calculating the rotational primary component information, the rotational primary component information corresponding to at least one of the plurality of specific rotational speeds is calculated while the rotating body is being accelerated.

7. The information acquisition method according to any one of claims 1 to 3, further comprising the step of measuring the specific vibration data, which includes the step of rotating the rotating body at a plurality of specific rotational speeds in both a state in which a mass change process that changes the mass of the rotating body is not performed and a state in which a mass change process that changes the mass of the rotating body is performed, measuring the specific vibration data corresponding to each of the plurality of specific rotational speeds, and calculating an influence coefficient that indicates the degree to which the mass change process has an effect on the vibration of the rotating body based on the specific vibration data.

8. The information acquisition method according to claim 7, further comprising the step of calculating unbalance information based on the rotational primary component information and the influence coefficient.

9. The information acquisition method according to claim 8, further comprising the step of determining whether the rotational primary component information satisfies a criterion, wherein the step of calculating the unbalance information is calculated in the determination step if the rotational primary component information satisfies a criterion.

10. An information acquisition method according to any one of claims 1 to 3, further comprising: determining whether the rotational primary component information is equal to or greater than a reference value; and stopping the rotation of the rotating body if, in the determination step, it is determined that the rotational primary component information is equal to or greater than the reference value.

11. An information acquisition device for a rotating body that is rotatably supported by a non-contact bearing and rotates about a rotation axis, comprising: an acquisition unit that acquires low-frequency vibration data along a direction intersecting the rotation axis when the rotating body is rotating at a low-frequency rotation speed lower than a specific rotation speed; a first calculation unit that calculates runout information indicating the degree of runout caused by the shape of the rotating body based on the low-frequency vibration data; a measurement unit that measures specific vibration data along a direction intersecting the rotation axis when the rotating body is rotating at the specific rotation speed; and a second calculation unit that calculates the primary rotation component of the rotating body based on the runout information and the specific vibration data.

Images