Calibration system and method based on centrifugal acceleration

Abstract

The invention discloses a calibration system and method based on centrifugal acceleration, and the system comprises a mass body rotating disc which is provided with a sensor installation position in the diameter direction, and the radius distance of the sensor installation position relative to the center of the rotating disc is adjustable; the motor is used for controlling the turntable provided with the to-be-calibrated vibration sensor to rotate; the turntable feature acquisition module is used for acquiring the angular velocity of the mass body turntable in real time; and the data processing module is used for generating a first relation model representing a change relation between different rotating disc rotating speeds corresponding to a single installation position radius and the rotating disc angular speed when the rotating disc stably rotates, so as to analyze the deviation between the first relation models of different installation position radiuses and take the deviation information as compensation for calibrating the vibration sensor. The method is suitable for establishing a calibration system based on centrifugal acceleration, vibration errors in the calibration process are reduced, and the stability of the calibration device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor calibration, and in particular to a calibration system and method based on centrifugal acceleration. Background Art

[0002] In recent years, with the increasing demand for oil and gas, the drilling target is moving towards deeper and more complex oil and gas reservoirs and unconventional reservoirs. The rotary steerable system faces more complex and harsher downhole conditions during the drilling process, and the construction difficulty is increasing. Downhole drilling instruments can obtain downhole parameters in real time, so as to grasp the actual downhole drilling conditions in time and optimize the drilling parameters. At present, in terms of the calibration of downhole instruments, it is necessary to develop relevant calibration equipment to ensure that the engineering parameters obtained by the downhole measuring short section during the actual drilling process are real-time and accurate.

[0003] Accelerometers are widely used in many motion measurement fields such as inertial navigation, weapon guidance, resource exploration, mechanical equipment vibration monitoring, and robot intelligent manufacturing. As the basic component of motion measurement, the technological progress of accelerometers will play an important role in promoting the development of my country's advanced manufacturing industry and other industries. With the continuous development of my country's economy and national defense, the demand for research, manufacturing, testing, calibration and large-scale application of high detection sensitivity (level) accelerometers has become more and more significant.

[0004] At present, the methods for generating standardized and reproducible acceleration on the ground for calibration mainly include centrifuge method, linear vibration table method, single pendulum table method and gravity field inclination method. Among them, the centrifuge method uses the centripetal acceleration generated by a precision centrifuge as input, and is mainly used to calibrate the performance under large acceleration (1g~100g). The linear vibration table method uses the linear vibration acceleration generated by a precision linear vibration table as input, and the generated acceleration amplitude is generally between 0.1mg and 1g, and can also be used to calibrate the second-order nonlinear coefficient and frequency response characteristics. The single pendulum table method uses the component of gravity acceleration along the pendulum tangent direction when the digital pendulum swings along a small angle of the vertical plane as input. It is limited by the angular measurement accuracy of about 1 arc second of the optical dividing head, end gear disc and rotary encoder, and the sharp deterioration of the nonlinearity of the pendulum motion as the pendulum rotation angle increases. The acceleration amplitude generated by this method is generally between 0.1μg and 1mg. The gravity field inclination method tests the accelerometer at multiple points in the gravity field and even rolls over. It is also limited by the angle measurement accuracy and the amplitude of the earth's gravity field. The acceleration amplitude generated by this method is generally between 0.1μg and 1g. It can be seen that the calibration method commonly used on the ground currently produces a standardized and reproducible acceleration signal amplitude of not less than 0.1μg. If it is used for the research and testing of high-sensitivity accelerometers on the ground, it cannot completely guarantee that the calibration factor remains unchanged when the input acceleration is reduced from 0.1μg to ng level. For example, there is the possibility of a dead zone, and the scientificity and accuracy of the calibration method are insufficient.

[0005] On the other hand, in the prior art, the six-position method is usually used to calibrate the accelerometer at different positions. When stationary, the output value fitting method is used to calculate the three-axis zero bias and scale factor error of the accelerometer. However, this method requires collecting the values ​​of the accelerometer at different positions. If the value of the accelerometer does not change sufficiently, the existing ellipsoid fitting method may cause the calibration parameters to diverge or overfit, and thus fail to judge the sensor and downhole parameters.

[0006] It can be seen that with the widespread application of domestic rotary steering systems in oil systems, there is currently no calibration method and device for rotary steering acceleration sensors. The rotary steering instrument is connected to the drill bit, and is more directly affected by vibration and high temperature underground. Long-term environmental impacts can damage the circuits and drilling tools of the rotary steering system. Therefore, the measurement method of the prior art is difficult to maintain stable accuracy, and the measurement and calibration results have errors such as moment of inertia, mass, and vibration.

[0007] In summary, in order to improve the accuracy of acceleration calibration and provide strong support for the real-time accuracy of instrument measurement parameters, it is crucial for the existing technology to establish a calibration system based on centrifugal acceleration. Summary of the invention

[0008] The purpose of the present invention is to provide a sensor calibration solution that can improve the accuracy of acceleration calibration and fully consider the problem of low calibration accuracy caused by various error factors in actual operation.

[0009] In order to solve the above technical problems, an embodiment of the present invention provides a calibration system based on centrifugal acceleration, including: a mass body turntable, which is provided with a sensor mounting position in the diameter direction, wherein the radial distance of the sensor mounting position compared to the center of the turntable is adjustable; a motor, which is used to control the rotation of the turntable on which the vibration sensor to be calibrated is installed; a turntable feature acquisition module, which is used to acquire the angular velocity of the mass body turntable in real time; and a data processing module, which is used to generate a first relationship model characterizing the relationship between different turntable rotation speeds and turntable angular velocity changes corresponding to a single mounting position radius when the turntable rotates stably, thereby analyzing the deviation between the first relationship models of different mounting position radii, and using the deviation information as compensation for calibrating the vibration sensor.

[0010] Preferably, the turntable feature acquisition module includes: a plurality of magnets evenly spaced apart along the circumferential direction of the turntable side wall; a grating sensor for sensing the plurality of magnets when the turntable rotates, so as to transmit the sensing signal to the data processing module.

[0011] Preferably, there are three magnets, wherein the data processing module is further used to count according to the induction signal, so as to calculate the angular velocity of the turntable.

[0012] Preferably, the sensor installation position comprises: a plurality of installation holes evenly distributed along the diameter direction of the turntable, and the plurality of installation holes are symmetrical about the center of the turntable.

[0013] Preferably, the calibration system further comprises: a weight, wherein the weight is mounted on a symmetrical mounting hole of the mounting hole where the vibration sensor to be calibrated is located, and the weight of the weight is consistent with the weight of the vibration sensor to be calibrated.

[0014] Preferably, the calibration system also includes: a vibration monitoring module, which is installed at the center of the turntable and is used to collect vibration data at the installation position in real time, wherein the data processing module is also used to determine whether the vibration state of the current calibration system is stable based on the vibration data.

[0015] Preferably, the data processing module is further used to determine that the current calibration system platform is in a stable state when the vibration data is less than or equal to a preset vibration threshold, or to suspend the analysis of the first relationship model when the vibration data is greater than the preset vibration threshold.

[0016] Preferably, the data processing module is also used to calculate the average angular velocity of each first time period, and determine whether the current turntable is rotating stably based on the difference between the average angular velocity of adjacent first time periods, wherein if the difference is less than or equal to a preset error threshold, it is determined that the current turntable has entered a stable rotation state; if the difference is greater than the preset error threshold, it is determined that the current turntable is in an unstable rotation state.

[0017] On the other hand, an embodiment of the present invention also provides a calibration method based on centrifugal acceleration, which is implemented by the calibration system as described above, wherein the calibration method includes: installing the vibration sensor to be calibrated on a mass body turntable, wherein a sensor mounting position is provided in the diameter direction of the mass body turntable, and the radial distance of the sensor mounting position relative to the center of the turntable is adjustable; using a motor to control the rotation of the mounting turntable; using a turntable feature acquisition module to collect the angular velocity of the mass body turntable in real time; when the turntable rotates stably, the data processing module generates a first relationship model characterizing the relationship between different turntable rotation speeds and the turntable angular velocity changes corresponding to a single mounting position radius, and analyzes the deviation between the first relationship models of different mounting position radii, so as to use the deviation information as compensation for calibrating the vibration sensor.

[0018] Preferably, the calibration method further comprises: installing a weight on a symmetrical mounting hole of the mounting hole where the vibration sensor to be calibrated is located, and the weight of the weight is consistent with the weight of the vibration sensor to be calibrated.

[0019] Compared with the prior art, one or more embodiments of the above scheme may have the following advantages or beneficial effects:

[0020] The present invention proposes a calibration system and method based on centrifugal acceleration. The present invention solves the problem that the measurement method of the prior art is difficult to maintain stable accuracy. The data processing module calculates the difference between the average values ​​of the angular velocities of adjacent first time periods to ensure the rotation stability of the mass body turntable and improve the calibration accuracy. The vibration monitoring module monitors the vibration of the calibration system in real time to reduce the vibration error in the calibration result, and the first relationship model corresponding to the relationship between the different turntable speeds and the turntable angular velocity changes under different radius conditions is obtained by continuously adjusting the rotation speed and / or sensor radius. The deviation information of the sensor to be calibrated is determined by comparing and analyzing the first relationship model under different radius conditions to complete the calibration. The present invention can effectively reduce the vibration error during the calibration process, improve the stability of the calibration device, and provide strong support for the real-time accuracy of instrument measurement parameters.

[0021] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of the centrifugal acceleration-based calibration system of an embodiment of the present application.

[0024] Figure 2 This is a specific structural example diagram of a calibration system based on centrifugal acceleration according to an embodiment of the present application.

[0025] Figure 3 This is an example diagram of the layout of sensor installation positions in the centrifugal acceleration-based calibration system of an embodiment of the present application.

[0026] Figure 4 Schematic diagram of the flow of the centrifugal acceleration calibration method according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0028] In addition, the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions. Also, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described can be performed in a sequence different from that here.

[0029] The terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "one", "one" and "item" used herein are also intended to include plural numbers. It should also be understood that the terms "include" and / or "comprise" used herein specify the existence of stated features, integers, steps, operations, units and / or components, without excluding the existence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0030] As a basic element for motion measurement, the technological progress of accelerometers will play an important role in promoting the development of my country's advanced manufacturing industry and other industries. With the continuous development of my country's economy and national defense, the demand for research, manufacturing, testing, calibration and large-scale application of high detection sensitivity (level) accelerometers has become increasingly prominent.

[0031] At present, the methods for generating standardized and reproducible acceleration on the ground for calibration mainly include centrifuge method, linear vibration table method, single pendulum table method and gravity field inclination method. Among them, the centrifuge method uses the centripetal acceleration generated by a precision centrifuge as input, and is mainly used to calibrate the performance under large acceleration (1g~100g). The linear vibration table method uses the linear vibration acceleration generated by a precision linear vibration table as input, and the generated acceleration amplitude is generally between 0.1mg and 1g, and can also be used to calibrate the second-order nonlinear coefficient and frequency response characteristics. The single pendulum table method uses the component of gravity acceleration along the pendulum tangent direction when the digital pendulum swings along a small angle of the vertical plane as input. It is limited by the angular measurement accuracy of about 1 arc second of the optical dividing head, end gear disc and rotary encoder, and the sharp deterioration of the nonlinearity of the pendulum motion as the pendulum rotation angle increases. The acceleration amplitude generated by this method is generally between 0.1μg and 1mg. The gravity field inclination method tests the accelerometer at multiple points in the gravity field and even rolls over. It is also limited by the angle measurement accuracy and the amplitude of the earth's gravity field. The acceleration amplitude generated by this method is generally between 0.1μg and 1g. It can be seen that the calibration method commonly used on the ground currently produces a standardized and reproducible acceleration signal amplitude of not less than 0.1μg. If it is used for the research and testing of high-sensitivity accelerometers on the ground, it cannot completely guarantee that the calibration factor remains unchanged when the input acceleration is reduced from 0.1μg to ng level. For example, there is the possibility of a dead zone, and the scientificity and accuracy of the calibration method are insufficient.

[0032] On the other hand, in the prior art, the six-position method is usually used to calibrate the accelerometer at different positions. When stationary, the output value fitting method is used to calculate the three-axis zero bias and scale factor error of the accelerometer. However, this method requires collecting the values ​​of the accelerometer at different positions. If the value of the accelerometer does not change sufficiently, the existing ellipsoid fitting method may cause the calibration parameters to diverge or overfit, and thus fail to judge the sensor and downhole parameters.

[0033] In order to solve the above problems, the present invention proposes a calibration system and method based on centrifugal acceleration. The present invention solves the problem that the measurement method of the prior art is difficult to maintain stable accuracy. The data processing module calculates the difference between the average values ​​of the angular velocities of adjacent first time periods to ensure the rotation stability of the mass body turntable and improve the calibration accuracy. The vibration monitoring module monitors the vibration of the calibration system in real time to reduce the vibration error in the calibration result, and obtains the first relationship model corresponding to the relationship between the different turntable speeds and the turntable angular velocity changes under different radius conditions by continuously adjusting the speed and / or sensor radius. The deviation information of the sensor to be calibrated is determined by comparing and analyzing the first relationship model under different radius conditions to complete the calibration. The present invention can effectively reduce the vibration error during the calibration process, improve the stability of the calibration device, and provide strong support for the real-time accuracy of instrument measurement parameters.

[0034] Embodiment 1

[0035] Figure 1 It is a schematic diagram of the overall structure of the centrifugal acceleration-based calibration system of an embodiment of the present application. Figure 2 This is a specific structural example diagram of the centrifugal acceleration calibration system according to the embodiment of the present application. Figure 1 and Figure 2 The specific structure of the calibration system of this embodiment is described in detail.

[0036] like Figure 1 As shown, the device described in the embodiment of the present invention includes: a mass body turntable 5, a sensor to be calibrated 9, a motor 3, a turntable feature acquisition module 7 and a data processing module 8. Figure 3 As shown, 1 represents a magnet, 2 represents a mounting hole, 3 represents a motor, 4 represents a grating sensor, 5 represents a mass body turntable, and 6 represents a vibration sensor.

[0037] Specifically, a sensor mounting position is provided above the diameter of the mass body turntable 5. The radial distance of the sensor mounting position relative to the center of the turntable is adjustable. The vibration sensor 9 to be calibrated is installed on the mass body turntable 5 through the sensor mounting position. The motor 3 is used to control the turntable 5 on which the vibration sensor 9 to be calibrated is installed to rotate. The turntable feature acquisition module 7 is used to collect the angular velocity of the mass body turntable 5 in real time. The data processing module 8 is used to generate a first relationship model that characterizes the relationship between the different turntable rotation speeds and the turntable angular velocity changes corresponding to a single mounting position radius when the turntable 5 rotates stably, so as to analyze the deviation between the first relationship models of different mounting position radii, so as to use the deviation information as compensation for calibrating the vibration sensor 9.

[0038] In one embodiment, a sensor mounting position is provided on the mass body turntable 5. The sensor mounting position includes: a plurality of mounting holes 2 evenly distributed along the diameter direction of the mass body turntable 5. The plurality of mounting holes 2 are symmetrical about the center of the turntable 5. The mounting holes 2 can also be used to place weights. The weights are mounted on the mounting holes 2 symmetrical to the mounting holes 2 where the vibration sensor 9 to be calibrated is located, and the weight of the weights is consistent with the weight of the vibration sensor 9 to be calibrated.

[0039] In this embodiment, the mass body turntable 5 is made of a material with a heavy mass and a high density, and the mass body turntable 5 is connected to the motor 3 through a connecting shaft. When the motor 3 rotates, the mass body turntable 5 is driven to rotate at the same speed. The large mass body turntable 5 can eliminate the error caused by the modulation of the motor 3 when the motor 3 rotates, thereby improving the stability of the calibration platform.

[0040] Furthermore, multiple mounting holes 2 evenly distributed along the diameter direction of the mass body turntable 5 are used to place the sensor 9 and weights to be calibrated. The mass of the sensor 9 and the weight to be calibrated is equal, and the radius distance between the two and the center of the mass body turntable 5 is equal, so as to ensure that the state of the mass body turntable 5 is balanced and stable when rotating, reduce the generation of vibration, and thus improve the calibration accuracy of the vibration sensor 9. When adjusting the radius distance between the sensor 9 to be calibrated and the center of the turntable 5, the position of the weight is also adjusted accordingly.

[0041] In one embodiment, the turntable feature acquisition module 7 includes: a plurality of magnets 1, which are evenly spaced along the circumferential direction of the side wall of the turntable 5. A grating sensor 4, which is used to sense the plurality of magnets 1 when the turntable 5 rotates, so as to transmit the sensing signal to the data processing module 8, and then calculate the turntable angular velocity.

[0042] Figure 3 This is an example diagram of the layout of the sensor installation positions in the centrifugal acceleration-based calibration system of the embodiment of the present application. Figure 3As shown, three magnets 1 are placed 120° apart from each other in the circumferential direction of the side wall of the mass body turntable 5, and a grating sensor 4 is placed at the same horizontal position as the turntable magnet 1. When the mass body turntable 5 rotates driven by the motor 3, the magnet 1 passes the position of the grating sensor 4, and the grating sensor 4 senses the signal and uploads the signal to the data processing module 8.

[0043] In one embodiment, a bracket extending from the motor 3 is used to enable the sensing end of the grating sensor 4 to be arranged opposite to the side wall of the mass body turntable 5 .

[0044] Further, the data processing module 8 marks the sensing signal of the grating sensor 4 as A n In this embodiment, the signal sensed by the grating sensor 4 for the first time is marked as A. 1 The second signal sensed by the grating sensor 4 is marked as A 2 The data processing module 8 obtains the signal A based on 1 and signal A 2 The time and the angle between adjacent magnets 1 are used to calculate the angular velocity of the turntable.

[0045] In one embodiment, the turntable feature acquisition module 7 further includes: a vibration monitoring module 6. The vibration monitoring module 6 is installed at the center of the mass body turntable 5, and is used to collect vibration data at the installation position in real time.

[0046] In one embodiment, the data processing module 8 is used to obtain the vibration data collected by the vibration monitoring module 6 in real time, and judge whether the vibration state of the current calibration system is stable according to the vibration data. Specifically, when the vibration data is less than or equal to the preset vibration threshold, it is determined that the current calibration system platform is in a stable state; when the vibration data is greater than the preset vibration threshold, the analysis of the first relationship model is suspended.

[0047] In this embodiment, if Figure 2 As shown, the vibration monitoring module 6 is located at the center of the mass body turntable 5 to monitor the stability of the calibration platform in real time. When the frequency of the motor 3 changes, the speed of the mass body turntable 5 will also change through the motor connecting shaft, which will cause the turntable 5 to rotate unstably and cause the vibration of the calibration platform. The vibration monitoring module 6 collects the vibration data at the installation position in real time and uploads it to the data processing module 8.

[0048] Further, the data processing module 8 determines the stability of the current calibration system based on the vibration data and in combination with the preset vibration threshold. When the vibration data collected by the vibration monitoring module 6 is less than or equal to the preset vibration threshold, the data processing module 8 determines that the current calibration system platform is in a stable state and calculates the turntable angular velocity, and generates the relationship between the rotation speed of the mass body turntable 5 and the turntable angular velocity in combination with the preset frequency of the motor 3. Change the frequency of the motor 3, obtain the changing relationship between the different turntable rotation speeds and the turntable acceleration, and establish a calibration model, that is, a first relationship model. Then analyze the deviation between the first relationship models of different installation position radii. When the vibration data collected by the vibration monitoring module 6 is greater than the preset vibration threshold, the data processing module 8 suspends the analysis of the first relationship model, thereby reducing the calibration error caused by vibration and improving the accuracy of the calibration system.

[0049] In this embodiment, the data processing module 8 obtains the data of the sensor 9 to be calibrated at different installation position radii, analyzes and calculates the deviation information of the sensor 9 to be calibrated in combination with the first relationship model, and then uses the deviation information as compensation for calibrating the vibration sensor 9, thereby calibrating the vibration sensor 9.

[0050] In one embodiment, the data processing module 8 is further used to calculate the average angular velocity of each first time period, and determine whether the current turntable 5 is rotating stably according to the difference between the average angular velocity of adjacent first time periods. If the current difference is less than or equal to the preset error threshold, it is determined that the current turntable 5 has entered a stable rotation state; if the current difference is greater than the preset error threshold, it is determined that the current turntable 5 is in an unstable rotation state.

[0051] In this embodiment, when the mass body turntable 5 rotates under the drive of the motor 3, the magnet 1 passes the position of the grating sensor 4, and the grating sensor 4 senses a signal and uploads the signal to the data processing module 8. The data processing module 8 calculates the angular velocity in real time based on the time of the signals of two adjacent magnets 1 sensed by the grating sensor 4 and the angle of the two adjacent magnets 1, and calculates the average angular velocity in the first time period in combination with the preset first time period.

[0052] Further, the data processing module 8 calculates the difference between the average values ​​of the angular velocities in two adjacent first time periods. If the difference is less than or equal to the preset error threshold, it is determined that the current turntable 5 has entered a stable rotation state, and then a first relationship model of the relationship between the different turntable rotation speeds and the turntable angular velocity changes is generated; if the difference is greater than the preset error threshold, it is determined that the current turntable 5 is in an unstable rotation state, and the analysis of the first relationship model is suspended. The present invention can calculate the turntable angular velocity by measuring each magnet point with a grating, and further compare the average speed. When the average speed is close to the same, the speed is stable, thereby eliminating or reducing the accuracy of calibration due to vibration and stability (such as calibration errors caused by unstable turntable rotation), thereby improving calibration efficiency and calibration accuracy.

[0053] In this embodiment, the calibration system based on centrifugal acceleration is also used to verify the accuracy of the calibration. The calibration system compensates and corrects the vibration sensor 9 to be calibrated according to the deviation information calculated by the data processing module 8, and then turns on the calibration platform again for verification. The data of the vibration sensor 9 to be calibrated is obtained, and the deviation between it and the first relationship model is calculated. If the deviation is less than or equal to the preset deviation threshold, the calibration is determined to be successful. If the deviation is greater than the preset deviation threshold, recalibration is performed.

[0054] The present invention combines the motor speed to calibrate the vibration sensor. The turntable with a large mass can offset the asynchronous error between the turntable and the motor drive shaft, which is used to improve the stability of the speed. The three-axis vibration monitoring device in the middle of the turntable can monitor the stability of the calibration device. The radius of the sensor to be calibrated can be changed on the turntable, and weights of the same mass are placed at the sensor radius corresponding to the diameter line to further improve the stability of the calibration device. Grating points are installed on the side of the turntable at 120° apart to calculate the speed of the turntable.

[0055] Embodiment 2

[0056] Based on the centrifugal acceleration-based calibration system described in the first embodiment, the present invention further provides a centrifugal acceleration-based calibration method, which is used to implement the centrifugal acceleration-based calibration system described in the first embodiment.

[0057] Figure 4 FIG. 1 is a flow chart of a calibration method based on centrifugal acceleration according to an embodiment of the present application. Figure 4 As shown, the centrifugal acceleration calibration method according to the embodiment of the present invention comprises the following steps:

[0058] Step S410: Install the vibration sensor 9 to be calibrated on the mass body turntable 5.

[0059] Step S420: Use the motor 3 to control the installation turntable 5 to rotate.

[0060] Step S430: Use the turntable feature acquisition module 7 to acquire the angular velocity of the mass body turntable 5 in real time.

[0061] Step S440, when the turntable 5 rotates stably, the data processing module 8 generates a first relationship model that characterizes the relationship between the different turntable rotational speeds and the turntable angular velocity changes corresponding to a single installation position radius, and analyzes the deviation between the first relationship models of different installation position radii, so as to use the deviation information as compensation for calibrating the vibration sensor 9.

[0062] The present invention proposes a calibration system and method based on centrifugal acceleration. The present invention solves the problem that the measurement method of the prior art is difficult to maintain stable accuracy. The data processing module calculates the difference between the average values ​​of the angular velocities of adjacent first time periods to ensure the rotation stability of the mass body turntable and improve the calibration accuracy. The vibration monitoring module monitors the vibration of the calibration system in real time to reduce the vibration error in the calibration result, and the first relationship model corresponding to the relationship between the different turntable speeds and the turntable angular velocity changes under different radius conditions is obtained by continuously adjusting the rotation speed and / or sensor radius. The deviation information of the sensor to be calibrated is determined by comparing and analyzing the first relationship model under different radius conditions to complete the calibration. The present invention can effectively reduce the vibration error during the calibration process, improve the stability of the calibration device, and provide strong support for the real-time accuracy of instrument measurement parameters.

[0063] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person familiar with the technology within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0064] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0065] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0067] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0068] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A calibration system based on centrifugal acceleration, It is characterized in that include: A mass body turntable, which is provided with a sensor installation position in the diameter direction, wherein the radial distance of the sensor installation position relative to the center of the turntable is adjustable; A motor, which is used to control the rotation of a turntable on which the vibration sensor to be calibrated is installed; A turntable feature acquisition module, which is used to acquire the angular velocity of the mass body turntable in real time; A data processing module is used to generate a first relationship model that characterizes the relationship between the different turntable rotation speeds and the turntable angular velocity changes corresponding to a single installation position radius when the turntable rotates stably, thereby analyzing the deviation between the first relationship models of different installation position radii, and using the deviation information as compensation for calibrating the vibration sensor.

2. The calibration system according to claim 1, It is characterized in that The turntable feature acquisition module comprises: A plurality of magnets are evenly spaced and distributed along the circumferential direction of the side wall of the turntable; The grating sensor is used to sense the plurality of magnets when the turntable rotates, so as to transmit the sensing signal to the data processing module.

3. The calibration system according to claim 2, It is characterized in that There are three magnets, wherein the data processing module is also used to count according to the induction signal, so as to calculate the angular velocity of the turntable.

4. The calibration system according to any one of claims 1 to 3, It is characterized in that The sensor installation position includes: a plurality of installation holes evenly distributed along the diameter direction of the turntable, and the plurality of installation holes are symmetrical about the center of the turntable.

5. The calibration system according to claim 4, It is characterized in that The calibration system further includes: a weight, which is mounted on a symmetrical mounting hole of the mounting hole where the vibration sensor to be calibrated is located, and the weight of the weight is consistent with the weight of the vibration sensor to be calibrated.

6. The calibration system according to any one of claims 1 to 5, It is characterized in that The calibration system also includes: A vibration monitoring module is installed at the center of the turntable and is used to collect vibration data at the installation position in real time, wherein the data processing module is also used to determine whether the vibration state of the current calibration system is stable based on the vibration data.

7. The calibration system according to claim 6, It is characterized in that The data processing module is further used to determine that the current calibration system platform is in a stable state when the vibration data is less than or equal to a preset vibration threshold, or to suspend the analysis of the first relationship model when the vibration data is greater than the preset vibration threshold.

8. The calibration system according to claim 2 or 3, It is characterized in that The data processing module is further used to calculate the average angular velocity of each first time period, and determine whether the current turntable is rotating stably based on the difference between the average angular velocity of adjacent first time periods, wherein if the difference is less than or equal to a preset error threshold, it is determined that the current turntable has entered a stable rotation state; if the difference is greater than the preset error threshold, it is determined that the current turntable is in an unstable rotation state.

9. A calibration method based on centrifugal acceleration, It is characterized in that The calibration method is implemented by a calibration system according to any one of claims 1 to 8, wherein the calibration method comprises: The vibration sensor to be calibrated is installed on the mass body turntable, wherein a sensor installation position is provided in the diameter direction of the mass body turntable, and the radial distance of the sensor installation position compared to the center of the turntable is adjustable; Use a motor to control the rotation of the mounting turntable; Using a turntable feature acquisition module to acquire the angular velocity of the mass body turntable in real time; When the turntable rotates stably, the data processing module generates a first relationship model that characterizes the relationship between different turntable rotational speeds and turntable angular velocity changes corresponding to a single installation position radius, and analyzes the deviation between the first relationship models of different installation position radii to use the deviation information as compensation for calibrating the vibration sensor.

10. The calibration method according to claim 9, It is characterized in that The calibration method further comprises: The weight is installed on a symmetrical mounting hole of the mounting hole where the vibration sensor to be calibrated is located, and the weight of the weight is consistent with the weight of the vibration sensor to be calibrated.

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