Rotating machine operating condition determination device, operation support device, control device, and operating condition determination method

Abstract

To expand an operation range of a rotary machine by accurately determining operation condition for suppressing rubbing which is based on an acoustic signal, when the rubbing is detected in the rotary machine.SOLUTION: An AE signal is acquired from an AE sensor installed at a fixed section of a rotary machine, and based on the AE signal, presence of rubbing in the rotary machine is determined. As a result, when it is determined that rubbing is present, rubbing suppression operation condition imposed on the rotary machine is determined in order to suppress the rubbing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an operating condition determination device, an operation assistance device, a control device, and an operating condition determination method for a rotating machine. [Background technology]

[0002] Conventionally, rubbing in rotating machines has been detected by detecting the vibration of the rotating shaft. The vibration of the rotating shaft can occur when the heat generated by rubbing causes the rotating shaft to bend due to heat generated by rubbing, which causes rubbing (rubbing) between the seal and the rotating shaft due to thermal deformation of the casing. The occurrence of such rubbing leads to axial vibration of the rotating machine and performance degradation due to seal deterioration. In addition, since the axial vibration of the rotating shaft is a phenomenon that can be detected when rubbing has progressed to the point where thermal bending occurs in the rotor, when rubbing is detected by axial vibration, there is a risk that measures that significantly affect the operation of the rotating machine, such as an emergency stop of the rotating machine, will be required. Therefore, there is a demand for early detection of rubbing.

[0003] In order to solve such problems, a technology has been proposed to detect rubbing earlier than before by using an acoustic signal. For example, Patent Document 1 discloses a device that can diagnose the presence or absence of rubbing in a rotating machine by using an acoustic signal based on the sound generated by an abnormal phenomenon of a rotating body in the rotating machine in a plant. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3393908 Summary of the Invention [Problem to be solved by the invention]

[0005] The occurrence of rubbing in a rotating machine is a factor that narrows the operating range of the rotating machine, such as an emergency stop of the rotating machine, as described above. In the above-mentioned Patent Document 1, rubbing diagnosis based on an acoustic signal makes it possible to detect rubbing at an earlier stage than in the past, but does not consider how to improve the operating range of the rotating machine by controlling the rotating machine after rubbing detection. Furthermore, rubbing in a rotating machine tends to occur when the load of the rotating machine fluctuates, such as at start-up, during load fluctuation, and when switching to a low-load operating mode. Therefore, excessive margins are set for the operating conditions of the rotating machine in these cases, restricting the operating range of the rotating machine.

[0006] At least one embodiment of the present invention has been developed in consideration of the above-mentioned circumstances, and aims to provide an operating condition determination device, an operating assistance device, a control device, and an operating condition determination method for a rotating machine that can expand the operating range of a rotating machine by accurately determining operating conditions for suppressing rubbing when rubbing is detected in the rotating machine based on an acoustic signal. [Means for solving the problem]

[0007] In order to solve the above problems, an operating condition determination device for a rotary machine according to at least one embodiment of the present invention includes: an AE sensor that is installed on a fixed portion of a rotating machine and that acquires an AE signal of the rotating machine; a determination unit for determining the presence or absence of rubbing in the rotating machine based on the AE signal; an operating condition determination unit for determining a rubbing suppression operating condition to be imposed on a control of the rotating machine in order to suppress the rubbing when the determination unit determines that the rubbing is present; Equipped with.

[0008] In order to solve the above problems, at least one embodiment of the rotary machine operation assistance device according to the present invention comprises: An operating condition determination device for a rotary machine according to at least one embodiment of the present invention; a rubbing occurrence region identifying unit that identifies a rubbing occurrence region for a parameter related to an operating state of the rotary machine based on a result of the determination by the determining unit as to whether or not rubbing occurs; A display unit for displaying a rubbing occurrence area; Equipped with.

[0009] In order to solve the above problem, a control device for a rotating machine according to at least one embodiment of the present invention includes: An operating condition determination device for a rotary machine according to at least one embodiment of the present invention; a control unit for controlling the rotary machine based on the operating conditions determined by the operating condition determination device; Equipped with.

[0010] In order to solve the above problem, a method for determining operating conditions of a rotary machine according to at least one embodiment of the present invention includes: a step of installing the sensor on a fixed portion of a rotating machine and acquiring an AE signal of the rotating machine; determining whether or not rubbing occurs in the rotating machine based on the AE signal; determining, when the rubbing is determined to be present, a rubbing suppression operating condition to be imposed on a control of the rotating machine in order to suppress the rubbing; Equipped with. Effect of the Invention

[0011] According to at least one embodiment of the present invention, it is possible to provide an operating condition determination device, an operation assistance device, a control device, and an operating condition determination method for a rotating machine that can expand the operating range of a rotating machine by accurately determining operating conditions for suppressing rubbing when rubbing is detected in the rotating machine based on an acoustic signal. [Brief description of the drawings]

[0012] [Figure 1] 1 is a configuration diagram showing an operating condition determination device according to an embodiment of the present invention together with a rotating machine. [Diagram 2] 1 is a graph showing the amplitude of the AE signal after envelope processing for each rotation order. [Diagram 3] 13 is a graph showing a time series distribution of a rubbing detection index. [Figure 4] 13 is a graph showing the cumulative probability of the rubbing detection index. [Diagram 5] 4 is an example of rubbing suppression operating conditions set for several operating modes. [Figure 6] 2 is a configuration diagram showing a rotary machine operation support device including the operation condition determination device of FIG. 1. [Figure 7] 7 is an example of a map created by the map creating unit of FIG. 6. [Figure 8] 7 is another example of the map created by the map creating unit of FIG. 6. [Figure 9] 2 is a configuration diagram showing a control device for a rotary machine including the operating condition determination device of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions excluding the presence of other elements.

[0014] FIG. 1 is a configuration diagram showing an operating condition determination device 100 according to this embodiment together with a rotary machine 10. In FIG. 1, a steam turbine is shown as an example of the rotary machine 10, but the rotary machine 10 is not limited to a steam turbine and may be various rotary machines such as a gas turbine or a compressor. The rotary machine 10 of this embodiment has a rotating shaft 30 supported at both ends by a bearing portion 20 that is a fixed portion, the rotating shaft 30 having a plurality of arranged rotor blades 32, and a casing 40 having a plurality of arranged stator blades 44, and the rotor blades 32 and the stator blades 44 are arranged alternately in each row and housed in the casing 40. The AE sensor 50 is attached to the bearing portion 20.

[0015] Steam, which is a working fluid W that flows in from an inlet 42 of the casing 40, passes through the rotor blades 32 arranged on the rotary shaft 30 inside the casing 40, and acts on the rotor blades 32 to impart a rotational force to the rotary shaft 30. Stator blades 44 arranged in the casing 40 adjust the flow of steam. The steam that has passed through the rotor blades 32 flows out from an outlet 46.

[0016] The AE sensor 50 is configured as a sensor for detecting AE (Acoustic Emission; high frequency output), and outputs the detected AE wave as an AE signal S. The AE sensor 50 is attached to the bearing portion 20.

[0017] In the rotating machine 10, for example, a seal or the like attached to the thermally deformed casing 40 may rub against the rotating shaft 30, and in that case, an AE wave is generated due to the rubbing. For example, the AE wave generated at the location R where the rubbing occurs propagates as an elastic wave on the surface of the rotating shaft 30 and is detected by the AE sensor 50 via the bearing part 20. The AE wave generally has a frequency in the sound wave region of several tens of kHz to several MHz. The AE signal S detected by the AE sensor 50 contains the frequency of the AE wave generated by the rubbing and the frequency of a noise signal N from other noise.

[0018] The AE sensor 50 includes an element that detects the vibration of the AE wave and outputs it as a voltage, and an amplifier that amplifies the voltage from the element and outputs it as an electrical signal.

[0019] The tachometer 52 is configured to detect the rotation speed f of the rotating shaft 30. The tachometer 52 includes, for example, a dog attached to the rotating shaft 30 and a detector that detects the dog, and when the rotating shaft 30 rotates once and the dog is input once to the tachometer 52, the tachometer 52 outputs the rotation speed f based on that. The rotation speed f output from the tachometer 52 can be acquired in synchronization with the AE signal S.

[0020] The operating condition determination device 100 is composed of, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium or the like in the form of a program, for example, and the CPU reads the program into the RAM or the like and executes information processing and arithmetic processing to realize various functions. The program may be installed in a ROM or other storage medium in advance, may be provided in a state stored in a computer-readable storage medium, or may be distributed via a wired or wireless communication means. The computer-readable storage medium may be a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

[0021] As shown in FIG. 1, the operating condition determination device 100 includes a signal acquisition unit 110, a storage unit 112, a determination unit 120, an operating condition determination unit 130, and an output unit 140.

[0022] The signal acquiring unit 110 is configured to acquire an AE signal S from the AE sensor. The signal acquiring unit 110 acquires the AE signal S from the AE sensor 50 by executing a program recorded in the storage unit 112, and stores the acquired AE signal S in the storage unit 112 as data. The AE signal S is acquired at a predetermined interval. The AE signal S is acquired at a time interval, for example, once every few seconds. The signal acquiring unit 110 acquires data for a time period during which the rotating shaft makes two to four rotations in one data acquisition, for example.

[0023] The judgment unit 120 is configured to judge the presence or absence of rubbing based on the AE signal S acquired by the signal acquisition unit 110, and is configured to include a filter processing unit 121, a data processing unit 122, a rotational synchronous component calculation unit 123, an index calculation unit 124, a threshold calculation unit 125, and a rubbing judgment unit 126.

[0024] The filter processing unit 121 executes a program stored in the storage unit 112 to perform filtering on the AE signal S and output a filtered AE signal Sf. The filter processing unit 121 has a filter that has a predetermined frequency component as a pass band. The pass band of the filter that the filter processing unit 121 has includes any frequency band of several tens of kHz to several MHz, which are frequency components included in the AE signal S.

[0025] The data processing unit 122 executes a program stored in the storage unit 112 to perform predetermined envelope processing, resampling, and zero averaging on the AE signal S or the filtered AE signal Sf. The envelope processing performs envelope processing on the AE signal S or the AE signal Sf, and outputs an AE signal Sr from which high-frequency components have been removed. The resampling process performs resampling at a predetermined frequency on the envelope-processed AE signal Sr, and outputs the resampled AE signal Sp. The average value zeroing process performs processing on the AE signal Sp to set the average value of the amplitude per period, which is the synchronous average, to zero, and outputs the average value zeroing-processed AE signal Sz.

[0026] The rotation-synchronous component calculation unit 123 performs frequency analysis on the AE signal Sz by executing a program stored in the storage unit 112. By performing frequency analysis, the rotation-synchronous component calculation unit 123 converts the AE signal Sz, which is a time series function, into a frequency function expressed as an amplitude for each frequency, and outputs a rotation-order analysis result F in which the frequency is expressed by the rotation order (FIG. 2). Here, FIG. 2 is a graph showing the amplitude of the AE signal after envelope processing for each rotation order. The rotation order is an order in which the frequency component corresponding to the rotation speed f of the rotating shaft 30 is set to 1. Here, the rotation speed 1 multiple component C has a frequency component that is the rotation order 1 output by the rotation-synchronous component calculation unit 123.

[0027] The index calculation unit 124 executes a program recorded in the storage unit 112 to calculate a rubbing detection index D from information on the phase of the AE signal S. The rubbing detection index D is obtained as a time series distribution as shown in Fig. 3. The rubbing detection index D is calculated by the following formula (1). Rubbing detection index = 1 / (1 + (AE signal phase variance)^0.5) (1)

[0028] The rubbing detection index D is calculated, for example, by using the variance of the phase of the 1x rotation number component C. Specifically, the variance of the phase of the 1x rotation number component C is calculated as the variance of the 1x rotation number component extracted phase P calculated by performing a predetermined sampling on the phase of the 1x rotation number component C. The 1x rotation number component extracted phase P is calculated as the phase shift of the period of the 1x rotation number component C with respect to the period of the rotation number f obtained by the revolution meter 52. The 1x rotation number component C extracted phase P is calculated by sampling 5-10 times at intervals of several seconds, for example.

[0029] The threshold calculation unit 125 executes a program recorded in the storage unit 112 to obtain a threshold T for determining the presence or absence of rubbing for the rubbing detection index D. The threshold T is calculated from the cumulative probability of the rubbing detection index D in a state in which rubbing does not occur, as shown in FIG. 4, for example. The threshold T may be calculated as a threshold value by, for example, pre-specifying a cumulative probability, and a rubbing detection index D that satisfies the cumulative probability. The threshold T may be calculated as a threshold value by, for example, pre-specifying a rubbing detection index D. That is, for example, in the example shown in FIG. 4, a cumulative probability of 99.7% may be pre-specified, and a rubbing detection index D of 0.034 calculated based on the cumulative probability may be used as the threshold T, or the threshold T may be pre-specified as 0.034, for example.

[0030] The rubbing determination unit 126 executes a program stored in the storage unit 112 to determine the presence or absence of rubbing with respect to the rubbing detection indicator D. The determination of the presence or absence of rubbing is performed by comparing the rubbing detection indicator D with a threshold value T. The rubbing determination unit 126 may be configured to, for example, output a message indicating that rubbing is present on a monitor display when the rotating machine 10 determines that rubbing is present.

[0031] The determination unit 120 thus calculates a rubbing detection index based on the information on the phase of the AE signal S, thereby determining whether or not rubbing is present based on the rubbing detection index. If the amplitude of the AE signal S of rubbing from the AE sensor 50 were used as an index, in a rotating machine with a large noise signal from other noises, such as a steam turbine, the amplitude of the AE signal of rubbing would be smaller than the amplitude of the noise signal from other noises, and would be buried in the noise signal from other noises, so there was a risk that the AE signal of rubbing would not be detected. By calculating the rubbing detection index based on the information on the phase of the AE signal S, the determination unit 120 can detect rubbing with higher accuracy and efficiency even in a rotating machine with a large noise signal from other noises, such as a steam turbine.

[0032] Next, the operating condition determination unit 130 is configured to determine rubbing suppression operating conditions, which are operating conditions imposed on the rotating machine 10 to suppress rubbing, when the determination unit 120 determines that rubbing is present. The rubbing suppression operating conditions are set for each operating mode of the rotating machine 10, and are defined as operating conditions necessary to suppress rubbing in the operating state of the rotating machine 10 in each operating mode.

[0033] In this embodiment, the rotating machine 10 has a plurality of operation modes, and rubbing suppression operation conditions are set for some operation modes in which the possibility of rubbing occurring is relatively high among the plurality of operation modes. For example, in the rapid start-up mode, the load fluctuation mode, and the low-load operation mode among the operation modes of the rotating machine 10, rubbing tends to occur easily because the rotation speed or load of the rotating machine 10 fluctuates.

[0034] The rapid start mode is a mode for rapidly starting the rotating machine 10 that is in a stopped state, and the rotation speed of the rotating machine 10 increases rapidly. In the load variation mode, the load of the rotating machine 10 varies based on an external output command. In the low-load operation mode, when the operation of the rotating machine 10 becomes unnecessary due to an external output command, the rotating machine 10 is maintained in a low-load state without being stopped, so that when the operation of the rotating machine 10 becomes necessary again due to an output command, the rotating machine 10 can follow the load with good responsiveness. In recent years, when the rotating machine 10 is a steam turbine or the like connected to a generator in a power plant, the rotating machine 10 is increasingly implemented in these operation modes in accordance with an increase in the proportion of natural energy in the power system. That is, natural energy is relatively unstable because it fluctuates depending on environmental conditions, and the rotating machine 10 is increasingly controlled in these operation modes in response to an output command to the power plant to meet power demand.

[0035] 5 shows an example of rubbing suppression operation conditions set for several operation modes. In this example, a first rubbing suppression operation condition C1, a second rubbing suppression operation condition C2, and a third rubbing suppression operation condition C3 are set for the quick start mode, the load change mode, and the low load operation mode, respectively.

[0036] The first rubbing suppression operation condition C1 is a rubbing suppression operation condition corresponding to the rapid start mode, and is set to temporarily hold the rotation speed of the rotating machine 10, which increases over time during rapid start-up. Specifically, when the determination unit 120 determines that rubbing is present during rapid start-up of the rotating machine 10, the rotation speed of the rotating machine 10 at that time is held, and when it is subsequently determined that rubbing is not present (i.e., when it is determined that rubbing is released), the rotation speed of the rotating machine 10 is set to resume increasing. In this way, when the determination unit 120 determines that rubbing is present, the rapid start-up is temporarily stopped, thereby making it possible to suppress further progress of rubbing.

[0037] The second rubbing suppression operation condition C2 is a rubbing suppression operation condition corresponding to the load variation mode, and is set to temporarily hold the load variation when the rotating machine 10 is operated while varying the load in response to an external output command. Specifically, when the determining unit 120 determines that rubbing is present during the load variation of the rotating machine 10, the load of the rotating machine 10 at that time is held, and when it is subsequently determined that rubbing is not present (i.e., when it is determined that rubbing is released), the load variation of the rotating machine 10 is set to be resumed. As a result, when the determining unit 120 determines that rubbing is present, the load variation is temporarily stopped, thereby making it possible to suppress further progress of rubbing.

[0038] The third rubbing suppression operation condition C3 is a rubbing suppression operation condition corresponding to a low-load operation mode, and is set so that when the load of the rotating machine 10 is reduced in order to operate the rotating machine 10 at a low load in response to an output command from the outside, the load reduction is interrupted and the load is maintained or temporarily increased. Specifically, when the determination unit 120 determines that rubbing is present during the load reduction of the rotating machine 10, the load reduction of the rotating machine 10 at that time is maintained or temporarily increased, and then, when it is determined that rubbing is not present (i.e., when it is determined that rubbing is released), the load reduction of the rotating machine 10 is resumed. In this way, when the determination unit 120 determines that rubbing is present, the load reduction is temporarily interrupted, thereby suppressing further progress of rubbing.

[0039] Furthermore, the operating condition determination unit 130 may define, as another rubbing suppression operating condition, a fourth rubbing suppression operating condition C4 for performing ACC control to increase (or widen) the size of the gap existing between the rotating part and the fixed part of the rotating machine 10 in order to alleviate rubbing. The size of the gap may be adjusted, for example, by heating a fixed part of the rotating machine (e.g., a stationary member such as a casing or a blade ring) that defines the gap, thereby causing thermal expansion (or thermal contraction), or by adjusting the pressure in the gap (more specifically, the ambient pressure of a member such as a seal ring that defines the gap) by controlling the opening and closing of a valve, thereby moving a member (such as a seal ring) that defines at least a part of the gap. The rubbing suppression operation condition may be commonly associated with a plurality of operation modes. In FIG. 5, the fourth rubbing suppression operation condition C4 is commonly associated with each of the rapid start-up mode, the load change mode, and the low load operation mode.

[0040] Such rubbing suppression operation conditions for each operation mode are associated with each other and stored in advance in the storage unit 112. The operation condition determination unit 130 determines the operation conditions by identifying the operation mode being performed by the rotating machine 10 and selecting the rubbing suppression operation condition corresponding to the operation mode from the storage unit 112. The operation conditions determined by the operation condition determination unit 130 are then output from the output unit 140 to the outside.

[0041] As described above, according to the operating condition determination device 100 of this embodiment, the occurrence of rubbing is determined early based on the acoustic signal acquired by the AE sensor, and when it is determined that rubbing is present, the rubbing suppression operating condition to be imposed on the control of the rotating machine in order to suppress rubbing is determined. By imposing the rubbing suppression operating condition determined in this manner on the rotating machine, rubbing can be suppressed, thereby avoiding emergency stop of the rotating machine and effectively widening the operating range.

[0042] <Driving assistance device> Next, an operation support device 200 for a rotating machine 10 using the above-mentioned operation condition determination device 100 will be described. Fig. 6 is a configuration diagram showing an operation support device 200 for a rotating machine 10 equipped with the operation condition determination device 100 of Fig. 1. The operation support device 200 includes the operation condition determination device 100, an operation state identification unit 210, a map creation unit 220, and a display unit 230.

[0043] The operating condition determination device 100 has the above-mentioned configuration, and in particular, the determination unit 120 determines whether rubbing occurs in the rotating machine 10. Furthermore, the operating state identification unit 210 identifies the operating state of the rotating machine 10 in synchronization with the determination unit 120. The operating state of the rotating machine 10 is defined by at least one parameter.

[0044] The map creation unit 220 creates a map based on the determination result in the determination unit 120 and the operating state identified by the operating state identification unit 210. Here, Fig. 7 is an example of a map created by the map creation unit 220 of Fig. 6. In the example of Fig. 7, the operating state is identified by two parameters, namely, "load change rate" and "time elapsed since the previous operation stop", and the rubbing determination result at each point indicating the past operating state of the rotating machine 10 is shown. According to this, a range R1 where the rubbing determination result is "absent" and a range R2 where the rubbing determination result is "present or absent" are shown to be distributed via a boundary line L, and it is shown that rubbing tends to occur more easily at a smaller load change rate as the time elapsed since the previous operation stop becomes longer.

[0045] Note that FIG. 7 illustrates an example in which the operating state of the rotating machine 10 is identified by two parameters, namely, the “load change rate” and the “elapsed time since the previous operation stoppage”, but the operating state of the rotating machine 10 may be identified by other parameters, such as the rate of increase in the rotation speed of the rotating machine 10 or the minimum load.

[0046] Fig. 8 is another example of a map created by the map creation unit 220 of Fig. 6. In the example of Fig. 8, the operating state is specified by two parameters, "load change rate" and "load", and the rubbing judgment results at each point indicating the past operating state of the rotating machine 10 when the load of the rotating machine 10 is reduced to transition to low-load operation are shown. As in Fig. 7, Fig. 8 also shows how a range R1 where the rubbing judgment result is "absent" and a range R2 where the rubbing judgment result is "present" are distributed via a boundary line L, and the larger the load change rate when the load is reduced, the larger the load that can be reached without rubbing.

[0047] Conventionally, in order to prevent rubbing from occurring in the rotating machine 10, an excessive margin has been set with respect to the boundary line L, for example, by assuming ranges R1 and R2 on a provisional boundary line L'. In contrast, in this embodiment, when rubbing occurs in the rotating machine 10, it can be determined earlier and more accurately by rubbing determination using an AE sensor, so that it is no longer necessary to set an excessive margin, and the operating range of the rotating machine 10 can be expanded as shown by the boundary line L compared to the conventional case.

[0048] The display unit 230 is configured to display the map created by the map creation unit 220 in a form recognizable by a user, such as a display. By referring to the map displayed on the display unit 230, the operator of the rotating machine 10 can easily understand the operating range in which rubbing does not occur, and by controlling the rotating machine 10 so that the operating state of the rotating machine 10 does not deviate from the operating range, operation can be performed in which rubbing occurrence is effectively avoided.

[0049] As described above, according to the driving assistance device 200 of this embodiment, by displaying on the display unit 230 a map showing the correlation between the judgment result in the judgment unit 120 and the operating state identified by the operating state identification unit 210, driving assistance can be provided for controlling the rotating machine 10 so that the operating state of the rotating machine 10 does not deviate from the operating range.

[0050] <Control device> Next, a description will be given of a control device 300 for a rotary machine 10 that utilizes the above-mentioned operating condition determination device 100. Fig. 9 is a configuration diagram showing a control device 300 for a rotary machine 10 that includes the operating condition determination device 100 of Fig. 1.

[0051] The control device 300 includes an operating condition determination device 100, a map creation unit 220, a control target value determination unit 310, and a control unit 320. The control device 300 includes an operating condition determination device 100, an operating state identification unit 210, a map creation unit 220, a control target value determination unit 310, and a control unit 320. The driving state identification unit 210 and the map creation unit 220 are the same as those in the driving support device 200 described above, and therefore a duplicated description will be omitted.

[0052] The control target value determination unit 310 determines a control target value for the control parameter of the rotating machine 10 based on the map created by the map creation unit 220. Specifically, the control target value determination unit 310 determines whether or not the original control target value calculated based on an external output command is within a range R1 in the map where the rubbing determination result is "absent." If the original control target value is within the range R1, the original control target value is used as is.

[0053] On the other hand, if the original control target value is not within range R1, the control target value determination unit 310 performs a correction so that the original control target value is within range R1. This correction may be performed, for example, so as to have a predetermined margin with respect to the boundary line L between ranges R1 and R2. This makes it possible to correct the control target value to one that can effectively prevent the occurrence of rubbing while suppressing deviation from the original control target value corresponding to the output command.

[0054] The control unit 320 controls the control parameters of the rotating machine 10 based on the control target value determined by the control target value determination unit 310. This makes it possible to control the rotating machine 10 to operate in a manner that satisfactorily follows the output command while avoiding the occurrence of rubbing.

[0055] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate.

[0056] The contents described in each of the above embodiments can be understood, for example, as follows.

[0057] (1) An operating condition determination device for a rotary machine according to one aspect includes: a signal acquiring unit for acquiring an AE signal from an AE sensor installed on a fixed portion of the rotating machine; a determination unit for determining the presence or absence of rubbing in the rotating machine based on the AE signal; an operating condition determination unit for determining a rubbing suppression operating condition to be imposed on a control of the rotating machine in order to suppress the rubbing when the determination unit determines that the rubbing is present; Equipped with.

[0058] According to the above aspect (1), the occurrence of rubbing can be determined early based on the AE signal acquired by the AE sensor, and when it is determined that rubbing is present, rubbing suppression operating conditions to be imposed on the control of the rotating machine in order to suppress rubbing are determined. By imposing the rubbing suppression operating conditions thus determined on the rotating machine, rubbing can be suppressed, thereby avoiding emergency stop of the rotating machine and effectively widening the operating range.

[0059] (2) In another embodiment, in the above embodiment (1), the rubbing suppression operating condition is preset for each operating mode of the rotary machine, The operating condition determination unit selects the rubbing suppression operating condition that corresponds to the operating mode being performed in the rotating machine when the determination unit determines that the rubbing occurs.

[0060] According to the above aspect (2), by selecting a rubbing suppression operating condition corresponding to the operating mode, rubbing occurring in the rotary machine in each operating mode can be effectively suppressed.

[0061] (3) In another embodiment, in the above embodiment (2), The operating modes involve variations in the speed or load of the rotating machine.

[0062] According to the above aspect (3), by setting rubbing suppression operating conditions for an operating mode in which rubbing is likely to occur due to fluctuations in the rotation speed or load of the rotating machine 10, rubbing in the rotating machine can be effectively suppressed.

[0063] (4) In another embodiment, in the above embodiment (2) or (3), When the operating mode being implemented by the rotating machine is a start-up mode in which the rotating machine is started in response to an output command, the operating condition determination unit determines the rubbing suppression operating condition so as to temporarily maintain the rotation speed of the rotating machine or reduce the speed increase rate when it is determined that rubbing is present.

[0064] According to the above aspect (4), when it is determined that rubbing is occurring when the rotation speed of the rotary machine increases over time in the start-up mode, the rubbing suppression operation conditions are determined so that the rotation speed of the rotary machine is temporarily maintained (held) (i.e., the start-up process of the rotary machine is temporarily stopped) or the speed increase rate is reduced. This makes it possible to effectively prevent rubbing from progressing as the rotation speed increases at the time of startup.

[0065] (5) In another embodiment, in the above (2) or (3), When the operating mode being implemented by the rotating machine is a load fluctuation mode in which the load of the rotating machine fluctuates in response to an output command, the operating condition determination unit determines the rubbing suppression operating conditions so as to temporarily maintain the load of the rotating machine at the time when it is determined that rubbing exists.

[0066] According to the above aspect (5), when it is determined that rubbing occurs when the load of the rotating machine increases over time in the load variation mode, the rubbing suppression operating conditions are determined so that the load of the rotating machine is temporarily maintained (held) (i.e., the load of the rotating machine is controlled to be approximately constant). This makes it possible to effectively prevent rubbing from progressing with load variations of the rotating machine.

[0067] (6) In another embodiment, in the above embodiment (2) or (3), When the operating mode implemented by the rotating machine is a low-load operating mode in which the rotating machine operates at a low load in response to an output command, the operating condition determination unit determines the rubbing suppression operating condition so as to maintain or increase the load of the rotating machine when it is determined that rubbing is present.

[0068] According to the above aspect (6), if it is determined that rubbing is occurring when the load of the rotating machine is reduced over time to transition to the low-load mode, the rubbing suppression operating conditions are determined so that the load of the rotating machine is maintained (temporarily held) or increased, thereby making it possible to effectively prevent rubbing from progressing as the load of the rotating machine is reduced.

[0069] (7) In another embodiment, in the above embodiment (2) or (3), When it is determined that the rubbing occurs, the operating condition determination unit determines the rubbing suppression operating condition so as to increase a clearance between the fixed part and the rotating part in the rotating machine.

[0070] According to the above aspect (7), when it is determined that rubbing occurs in a rotary machine, the rubbing can be suppressed by increasing (or widening) the clearance between the fixed part and the rotating part.

[0071] (8) In another embodiment, in any one of (1) to (7) above, The determination unit determines the presence or absence of rubbing based on a rubbing detection index calculated based on information on a phase of the AE signal.

[0072] According to the above aspect (8), the presence or absence of rubbing is determined based on the rubbing detection index calculated based on the phase information of the AE signal, so that rubbing of the rotating machine can be detected before the rotating shaft generates axial vibration, and rubbing of the rotating machine can be detected efficiently and accurately.

[0073] (9) An operation assistance device for a rotary machine according to one aspect includes: An operating condition determination device for a rotary machine according to any one of the above (1) to (8), an operating state identification unit for identifying an operating state of the rotary machine; a map creation unit that creates a map based on a determination result of the determination unit and the driving state identified by the driving state identification unit; a display unit for displaying the map created by the map creation unit; Equipped with.

[0074] According to the above aspect (9), by displaying a map showing the correlation between the rubbing judgment result and the operating state of the rotating machine on the display unit, driving assistance can be provided to the driver to operate the rotating machine so that the operating state of the rotating machine does not deviate from the operating range.

[0075] (10) A control device for a rotary machine according to one aspect includes: An operating condition determination device for a rotary machine according to any one of the above (1) to (8), an operating state identification unit for identifying an operating state of the rotary machine; a map creation unit that creates a map based on a determination result of the determination unit and the driving state identified by the driving state identification unit; a control target value determination unit for determining a control target value for a control parameter of the rotating machine based on the map created by the map creation unit; a control unit for controlling the control parameters based on the control target value determined by the control target value determination unit; Equipped with.

[0076] According to the above aspect (10), a control target value of a control parameter is determined within a range in which rubbing does not occur in the rotating machine based on a map showing a correlation between the rubbing judgment result and the operating state of the rotating machine. Then, by controlling the rotating machine so that the control parameter of the rotating machine becomes the control target value thus determined, it is possible to control the rotating machine to operate in a manner that satisfactorily follows an output command while avoiding the occurrence of rubbing.

[0077] (11) A method for determining operating conditions of a rotary machine according to one aspect includes the steps of: acquiring an AE signal from an AE sensor installed on a fixed portion of a rotating machine; determining whether or not rubbing occurs in the rotating machine based on the AE signal; determining, when the determination unit determines that the rubbing is present, a rubbing suppression operation condition to be imposed on a control of the rotating machine in order to suppress the rubbing; Equipped with.

[0078] According to the above aspect (11), the occurrence of rubbing can be determined early based on the AE signal acquired by the AE sensor, and when it is determined that rubbing is present, rubbing suppression operating conditions to be imposed on the control of the rotating machine in order to suppress rubbing are determined. By imposing the rubbing suppression operating conditions thus determined on the rotating machine, rubbing can be suppressed, thereby avoiding emergency stop of the rotating machine and effectively widening the operating range. [Explanation of symbols]

[0079] 10 Rotating Machinery 20 Bearing section 30 Rotational Axis 32 Moving blade 40 Cabin 42 Inlet 44 Stator blade 46 Outlet 50 Sensors 52 Tachometer 100 Operating condition determination device 110 Signal acquisition unit 112 Storage section 120 Judgment section 121 Filter processing section 122 Data Processing Unit 123 Rotation synchronous component calculation section 124 Indicator calculation section 125 Threshold calculation unit 126 Rubbing Judgment Unit 130 Operation condition determination unit 140 Output section 200 Driving support device 210 Driving state identification unit 220 Map Creation Department 230 Display section 300 Control device 310 Control target value determination unit 320 Control Unit

Claims

1. a signal acquiring unit for acquiring an AE signal from an AE sensor installed on a fixed portion of the rotating machine; a determination unit for determining the presence or absence of rubbing in the rotating machine based on the AE signal; an operating condition determination unit for determining a rubbing suppression operating condition to be imposed on a control of the rotating machine in order to suppress the rubbing when the determination unit determines that the rubbing is present; Equipped with the rubbing suppression operating condition is preset for each operating mode of the rotary machine, the operating condition determination unit selects the rubbing suppression operating condition corresponding to the operating mode being performed in the rotary machine when the determination unit determines that the rubbing is present, the operation modes include a low-load operation mode in which, when the operation of the rotating machine becomes unnecessary in response to an output command, the operation mode being implemented by the rotating machine maintains the rotating machine in a low-load state by reducing the load without stopping the rotating machine, and is capable of following the load when the operation of the rotating machine becomes necessary again in response to the output command; The rubbing suppression operating condition corresponding to the low-load operating mode is a condition in which reduction in the load of the rotating machine is interrupted or temporarily increased.

2. The device for determining operating conditions of a rotating machine according to claim 1 , wherein the operating mode involves a change in a rotation speed or a load of the rotating machine.

3. 3. The operating condition determination device for a rotating machine according to claim 1, wherein when the operating mode implemented in the rotating machine is a start-up mode in which the rotating machine is started in response to an output command, the operating condition determination unit determines the rubbing suppression operating condition so as to temporarily maintain the rotation speed of the rotating machine or reduce the speed increase rate when it is determined that the rubbing occurs.

4. 3. The operating condition determination device for a rotating machine as described in claim 1 or 2, wherein when the operating mode implemented in the rotating machine is a load fluctuation mode in which the load of the rotating machine fluctuates in response to an output command, the operating condition determination unit determines the rubbing suppression operating condition so as to temporarily maintain the load of the rotating machine at the time when it is determined that the rubbing occurs.

5. 3. The operating condition determination device for a rotating machine according to claim 1, wherein when it is determined that rubbing occurs, the operating condition determination unit determines the rubbing suppression operating condition so as to increase a clearance between the fixed portion and the rotating portion in the rotating machine.

6. The operating condition determination device for a rotating machine according to claim 1 , wherein the determination unit determines the presence or absence of rubbing based on a rubbing detection index calculated based on information on a phase of the AE signal.

7. The operating condition determination device for a rotary machine according to any one of claims 1 to 6, an operating state identification unit for identifying an operating state of the rotary machine; a map creation unit that creates a map based on a determination result of the determination unit and the driving state identified by the driving state identification unit; a display unit for displaying the map created by the map creation unit; An operation assistance device for a rotating machine comprising:

8. The operating condition determination device for a rotary machine according to any one of claims 1 to 6, an operating state identification unit for identifying an operating state of the rotary machine; a map creation unit that creates a map based on a determination result of the determination unit and the driving state identified by the driving state identification unit; a control target value determination unit for determining a control target value for a control parameter of the rotating machine based on the map created by the map creation unit; a control unit for controlling the control parameters based on the control target value determined by the control target value determination unit; A control device for a rotating machine comprising:

9. acquiring an AE signal from an AE sensor installed on a fixed portion of a rotating machine; determining whether or not rubbing occurs in the rotating machine based on the AE signal; determining, when the determination unit determines that the rubbing is present, a rubbing suppression operation condition to be imposed on a control of the rotating machine in order to suppress the rubbing; Equipped with the rubbing suppression operating condition is preset for each operating mode of the rotary machine, determining the rubbing suppression operating condition by selecting the rubbing suppression operating condition corresponding to the operating mode being performed in the rotary machine when it is determined that the rubbing is present; The operating modes include a low-load operating mode in which, when the operating mode implemented by the rotating machine becomes unnecessary in response to an output command, the rotating machine is maintained in a low-load state by reducing the load without stopping the rotating machine, and can follow the load when operation of the rotating machine becomes necessary again in response to the output command, and the rubbing suppression operating condition corresponding to the low-load operating mode is one in which the reduction in the load of the rotating machine is interrupted or temporarily increased.

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