Vibration detection apparatus and control method thereof

Abstract

The invention relates to a vibration detection device and a control method thereof, and relates to the technical field of vibration, the vibration detection device comprises a first detection piece, a second detection piece, a driving unit and a control unit, the first detection piece of the vibration detection device does not need to adopt a fixing screw or pasting or other rigid installation forms; instead, the driving unit is used for driving the first detection piece to move, so that the first detection piece is in contact with the to-be-detected object for real-time monitoring and testing, repeated detection is facilitated, and the detection efficiency is improved. Besides, the vibration test value and the vibration reference value are calibrated through the control unit, after calibration, according to the corrected vibration test value, the control unit can set the pressure parameter corresponding to the vibration test value as the preset parameter, and under the preset parameter, each detection can be carried out under the preset pressure parameter, so that the detection efficiency is improved. And the authenticity and accuracy of the data are improved, so that the reliability of the test data is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of vibration detection, and in particular to a vibration detection device and a control method thereof. Background Art

[0002] With the development of life, electronic products are widely used in life. Most electronic equipment needs to undergo relevant inspections before leaving the factory to detect whether the electronic products meet the quality requirements. Vibration testing is one of the important links in quality inspection.

[0003] Normally, vibration sensors are used to detect product vibration values. The main installation methods include probe, adhesive, screw, etc.

[0004] However, most probe sensors are handheld and are not accurate enough in detecting product vibrations. Since the sensors are difficult to remove using adhesives or screws, the objects being tested may be replaced frequently and cannot meet the needs of multiple scenarios and multiple tests, thus affecting the detection results. Summary of the invention

[0005] Based on this, it is necessary to provide a vibration detection device and a control method thereof for the above technical problems. The first detection member of the vibration detection device does not need to be installed in a rigid manner such as fixing screws or pasting. Instead, the first detection member is driven to move by a driving unit so that the first detection member contacts the object to be tested for real-time monitoring and testing, which is convenient for repeated detection and improves the detection efficiency. In addition, the vibration test value and the vibration reference value are calibrated by the control unit. After calibration, according to the corrected vibration test value, the control unit will set the pressure parameter corresponding to the vibration test value as the preset parameter. Under the preset parameters, each detection can be performed under the preset pressure parameters, which improves the authenticity and accuracy of the data, thereby ensuring the reliability of the test data.

[0006] A first aspect of the present invention provides a vibration detection device, which includes a first detection member, a second detection member, a drive unit and a control unit, wherein the first detection member is used to detect a vibration test value of an object to be detected; the second detection member is connected to the first detection member, and is used to detect a pressure parameter corresponding to the vibration test value in real time; the drive unit is connected to the second detection member, and is used to drive the second detection member to move along a preset direction so that the first detection member contacts the object to be detected; the control unit is connected to the drive unit, controls the pressure parameter to be adjusted to a preset parameter, and controls the drive unit based on the preset parameter.

[0007] Through the above technical solution, the driving unit is used to drive the first detection member to move, so that the first detection member contacts the object to be tested for real-time monitoring and testing. The first detection member does not need to be rigidly installed in the form of fixing screws or pasting, which is convenient for repeated detection and improves the detection efficiency. In addition, the control unit can be used to perform each detection under the preset pressure parameters, which improves the authenticity and accuracy of the data, thereby ensuring the reliability of the test data.

[0008] In one embodiment, the first detecting member and the second detecting member are spaced apart along a preset direction.

[0009] Through the above technical solution, the driving unit can drive the first detection member and the second detection member to move along a preset direction, and the first detection member can more accurately sense the vibration and pressure changes of the object to be detected.

[0010] In one of the embodiments, the vibration detection device further includes a flexible unit arranged between the first detection member and the second detection member.

[0011] Through the above technical solution, when the driving unit applies a load to the first detection member, the elasticity of the flexible unit will cause the strain gauge in the compressive force sensor to deform, resulting in a relative change in resistance. The flexible unit can quickly respond to the vibration characteristics of the object to be measured, expand the frequency response range of the detection device, achieve a good contact effect and transmit vibration characteristics, and can suppress the influence of vibration noise to a certain extent; at the same time, when using the compressive force sensor for measurement, the elastic characteristics of the flexible unit can compensate for the sensitivity and response speed of the sensor, thereby achieving more accurate measurement results.

[0012] In one embodiment, the first detection element includes at least one of a vibration sensor and a combined temperature-vibration sensor.

[0013] Through the above technical solution, suitable vibration sensors can be selected for specific application scenarios to achieve more accurate vibration detection and measurement. Vibration sensors are sensors that can sense vibration signals and convert them into electrical signal outputs. They have the advantages of high precision, high sensitivity and reliability, and are widely used in vibration measurement in machinery, electronics, aviation and other fields. Combined temperature and vibration sensors can measure temperature and vibration signals at the same time, which is of great significance for application scenarios that require simultaneous measurement of temperature and vibration signals.

[0014] In one embodiment, the second detection member includes a compressive force sensor.

[0015] Through the above technical solution, by combining the compressive force sensor with the vibration sensor, the vibration test value and pressure parameter of the object to be tested are measured simultaneously. The control unit can set the pressure parameter to an appropriate preset parameter to achieve accurate detection of the object to be tested under the preset parameter.

[0016] In one embodiment, the driving unit includes a driving portion connected to the second detecting member and a transmission portion connected to an output end of the driving portion, and the driving portion is used to drive the transmission portion to move along a preset direction.

[0017] Through the above technical solution, the driving unit can quickly control the movement of the transmission part, so that the first detection part can quickly contact the object to be measured, and multiple repeated measurements can be completed in a short time. The first detection part does not need to adopt rigid installation forms such as fixing screws or pasting, thereby improving measurement efficiency.

[0018] In one embodiment, the control unit includes a data collector connected to the first detection member and the second detection member, a motion control card connected to the drive unit, and a computer connected to the data collector and the motion control card, the data collector is used to obtain the vibration test value and the pressure parameter, the computer is used to control the pressure parameter to be adjusted to a preset parameter, and control the drive unit through the motion control card based on the preset parameter.

[0019] Through the above technical solution, the computer can adjust the pressure parameters to the preset parameters, and control the drive unit through the motion control card based on the preset parameters, so as to achieve precise control of the object to be measured, improve work efficiency, reduce human interference and errors, and ensure the stability and consistency of measurement.

[0020] In one of the embodiments, the vibration detection device further includes a load-bearing unit for supporting the driving unit and a shock-absorbing unit arranged on the load-bearing unit.

[0021] Through the above technical solution, the influence of external interference and noise on vibration detection can be reduced, and the accuracy and reliability of detection can be improved.

[0022] A second aspect of the present invention provides a control method for a vibration detection device, the control method comprising obtaining a vibration reference value of an object to be tested at a target position; obtaining a vibration test value of the object to be tested at the target position and a pressure parameter corresponding to the vibration test value; calibrating the vibration reference value according to the vibration test value; and if the calibration is successful, controlling the pressure parameter to be adjusted to a preset parameter, and controlling the drive unit based on the preset parameter.

[0023] Through the above technical solution, the vibration test value and the vibration reference value are calibrated by the control unit. After the calibration, according to the corrected vibration test value, the control unit will set the pressure parameter corresponding to the vibration test value as the preset parameter. Under the preset parameter, each detection can be performed under the preset pressure parameter, which improves the authenticity and accuracy of the data, thereby ensuring the reliability of the test data.

[0024] In one embodiment, the method for obtaining a vibration reference value of an object to be measured at a target position includes: installing a third detection member at the target position using an adhesive to obtain the vibration reference value.

[0025] Through the above technical solution, the vibration reference value of the object to be tested at the target position is detected by a rigid installation form such as pasting. This method can reduce external interference and avoid errors in detection data. The vibration reference value can be used as a calibration value for subsequent measurements, thereby improving the accuracy and reliability of the test.

[0026] The technical effects of the present invention are:

[0027] First, the first detection piece of the vibration detection device does not need to be installed in a rigid manner such as fixing screws or pasting. Instead, a driving unit is used to drive the first detection piece to move so that the first detection piece contacts the object to be tested for real-time monitoring and testing, which facilitates repeated testing and improves detection efficiency.

[0028] Second, in addition, the vibration test value and the vibration reference value are calibrated by the control unit. After calibration, based on the corrected vibration test value, the control unit will set the pressure parameter corresponding to the vibration test value as a preset parameter. Under the preset parameters, each detection can be performed under the preset pressure parameters, which improves the authenticity and accuracy of the data, thereby ensuring the reliability of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. 4 is a three-dimensional diagram of a vibration detection device in one embodiment.

[0030] Figure 2 Schematic diagram of the structure of a driving unit in one embodiment.

[0031] Figure 3 It is a schematic diagram of the structure of a control unit in one embodiment.

[0032] Figure 4 FIG. 4 is a flow chart of a control method of a vibration detection device in an embodiment.

[0033] Figure 5 Schematic diagram of the control method to maintain stable pressure parameters.

[0034] Description of the accompanying drawings: 100, vibration detection device; 10, first detection member; 20, second detection member; 30, drive unit; 31, drive part; 32, transmission part; 321, linear guide; 322, ball screw; 323, adapter plate; 324, fixed seat; 325, connecting rod; 40, control unit; 41, data acquisition device; 42, motion control card; 43, computer; 50, load-bearing unit; 60, shock-absorbing unit; 70, flexible unit; 200, object to be measured; X, preset direction. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, it can be the internal connection of two units or the interaction relationship between two units, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that if a unit is referred to as being "fixed to" or "disposed on" another unit, it may be directly on the other unit or there may be a central unit. If a unit is considered to be "connected to" another unit, it may be directly connected to the other unit or there may be a central unit at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0041] See also Figure 1 , Figure 2 and Figure 3, shows a schematic diagram of a vibration detection device in an embodiment of the present application, the vibration detection device 100 includes a first detection member 10, a second detection member 20, a drive unit 30 and a control unit 40, the first detection member 10 is used to detect the vibration test value of the object to be tested 200; the second detection member 20 is connected to the first detection member 10, and is used to detect the pressure parameter corresponding to the vibration test value in real time; the drive unit 30 is connected to the second detection member 20, and is used to drive the second detection member 20 to move along a preset direction X, so that the first detection member 10 contacts the object to be tested 200; the control unit 40 is connected to the drive unit 30, controls the pressure parameter to be adjusted to the preset parameter, and controls the drive unit 30 based on the preset parameter. The first detection member 10 does not need to adopt a rigid installation form such as fixing screws or pasting, but uses the drive unit 30 to drive the first detection member 10 to move, so that the first detection member 10 contacts the object to be tested 200 for real-time monitoring and testing, which is convenient for repeated detection and improves the detection efficiency. In addition, through the control unit 40, each detection can be carried out under the preset pressure parameter, which improves the authenticity and accuracy of the data, thereby ensuring the reliability of the test data.

[0042] like Figure 1 As shown, the vibration detection device 100 can be used to detect vibrations generated by different types of objects 200 to be detected, such as fans, motors, cylinders, robots, cars, bridges, large buildings and equipment. In addition, the vibration detection device 100 also includes a load-bearing unit 50 for supporting the driving unit 30 and a shock-absorbing unit 60 disposed on the load-bearing unit 50. The shock-absorbing unit 60 adopts a damping optical shock-absorbing platform, which can reduce the influence of external interference and noise on vibration detection and improve the accuracy and reliability of detection.

[0043] In this embodiment, the first detection member 10 includes a vibration sensor, and the second detection member 20 includes a compressive force sensor. The vibration sensor can be a vibration acceleration sensor, a vibration velocity sensor, a vibration displacement sensor, etc., which are based on different principles such as piezoelectric, electrostatic, gas damping or diaphragm. In this embodiment, a three-axis vibration sensor of Beijing Shengwang SW14533 is used. The compressive force sensor adopts Liheng Sensor LH-Z10C to detect the pressure parameters corresponding to the vibration test value in real time, which has the advantages of wide measurement range, high precision, fast response speed, strong anti-interference ability, etc. By combining the first detection member 10 and the second detection member 20, the vibration test value and pressure parameter of the object to be tested 200 are measured at the same time. The control unit 40 can set the pressure parameter to a suitable preset parameter based on the movement mode and speed of the driving unit 30. Under the preset parameters, the first detection member 10 and the object to be tested 200 are contacted in real time to detect, and the accuracy and consistency of each detection are ensured. The vibration detection device 100 can detect different types of objects to be tested to meet the needs of different practical application scenarios.

[0044] In other embodiments, a suitable vibration sensor can be selected for specific application scenarios. For example, the first detection member 10 adopts a temperature-vibration composite sensor. The temperature-vibration composite sensor is a sensor that can measure both temperature and vibration. It consists of a vibration sensor and a temperature sensor, and can measure vibration and temperature changes of different types of materials.

[0045] The compressive force sensor combined with the flexible unit 70 is an elastic body. When the driving unit 30 applies a load to the first detection member 10, the elasticity of the flexible unit 70 causes the strain gauge in the compressive force sensor to deform, and the resistance changes relatively. The transient response characteristics cooperate with the closed-loop control algorithm, and the Wheatstone bridge is used to accurately measure, ensure reliable results, and expand the frequency response range of the first detection member 10.

[0046] In this embodiment, the vibration detection device 100 also includes a flexible unit 70 disposed between the first detection member 10 and the second detection member 20. The flexible unit 70 can be at least one of a compression spring, a tension spring, a combination of a compression spring and a tension spring, and an elastic material. When the drive unit 30 applies a load to the first detection member 10, the elasticity of the flexible unit 70 causes the strain gauge in the compressive force sensor to deform, resulting in a relative change in resistance. The flexible unit 70 can quickly respond to the vibration characteristics of the object to be measured 200, expand the frequency response range of the detection device, achieve a good contact effect and conduct vibration characteristics, and can suppress the influence of vibration noise to a certain extent; at the same time, when using the compressive force sensor for measurement, the elastic characteristics of the flexible unit 70 can compensate for the sensitivity and response speed of the sensor, thereby achieving a more accurate measurement result.

[0047] like Figure 1 As shown, Figure 2As shown, in this embodiment, the vibration sensor and the pressure sensor are arranged at intervals along the preset direction X, and the vibration sensor and the pressure sensor are on the same straight line. The advantage of this design is that the vibration and pressure changes of the object 200 to be tested can be sensed more accurately. The driving unit 30 includes a driving part 31 connected to the second detection member 20 and a transmission part 32 connected to the output end of the driving part 31. The driving part 31 adopts a Panasonic MHMF011L1S1 servo motor. The transmission part 32 includes a linear guide 321, a ball screw 322, an adapter plate 323, a fixed seat 324 and a connecting rod 325. The linear guide 321 is connected to the servo motor. One end of the ball screw 322 is connected to the driving end of the servo motor and can drive the ball screw 322 to rotate, and the other end is rotatably connected to the inner wall of the linear guide 321. The adapter plate 323 is threadedly connected to the ball screw 322 and can slide on the linear guide 321. The fixed seat is arranged on the adapter plate 323 and connected to the connecting rod 325. The end of the connecting rod 325 is connected to the compressive force sensor through a connecting flange. The servo motor drives the ball screw 322 to rotate, and the adapter plate 323 slides on the linear guide rail 321, so that the connecting rod 325 drives the vibration sensor and the pressure force sensor to move along the preset direction X. The ball screw 322 converts the rotation of the servo motor into linear motion to meet the working requirements.

[0048] In other embodiments, the driving unit 30 may adopt other structures. For example, the driving unit 30 adopts a linear motor. The output end of the linear motor is connected to the pressure force sensor through a connecting flange. The output ends of the vibration sensor, the pressure force sensor and the linear motor are all in the preset direction X. The linear motor can drive the vibration sensor and the pressure force sensor to move along the preset direction X, which can also meet the working requirements.

[0049] like Figure 1 As shown, Figure 2 As shown, Figure 3 As shown, the control unit 40 includes a data collector 41, a motion control card 42 and a computer 43. The data collector 41 is connected to the first detection member 10 and the second detection member 20 and can obtain vibration test values ​​and pressure parameters. The computer 43 is connected to the data collector 41 and the motion control card 42, and the motion control card 42 is connected to the servo motor. Through the vibration test values ​​and pressure parameters collected by the data collector 41, the computer 43 can analyze and process the vibration conditions and pressure changes of the object to be tested 200. At the same time, the computer 43 can control the pressure parameters to be adjusted to the preset parameters, and control the rotation of the servo motor through the motion control card 42 based on the preset parameters.

[0050] See also Figure 4 This embodiment provides a control method for a vibration detection device, the control method comprising:

[0051] S401: Obtaining a vibration reference value of the object to be measured 200 at a target position;

[0052] like Figure 1 As shown, based on the vibration characteristics of the object to be tested 200, N typical working conditions of the object to be tested 200 are tested, the typical working conditions are different vibration states of the object to be tested 200, the target position of the object to be tested 200 is selected, and the third detection member (not shown) is installed at the target position using adhesive to obtain N vibration reference values. The third mounting member can be a vibration sensor, and the third detection member is installed by adhesive to detect the object to be tested 200. The vibration reference value is closest to the ideal state, and the vibration reference value has a higher accuracy. However, the gluing method is cumbersome to operate, cannot be automated, and is prone to leaving residues on the surface of the object to be tested 200.

[0053] S402: Acquire a vibration test value of the object to be tested 200 at a target position and a pressure parameter corresponding to the vibration test value;

[0054] like Figure 1 As shown, the vibration detection device 100 of this embodiment is used to test N typical working conditions of the object to be tested 200. Under the action of the driving unit 30, when the first detection member 10 contacts the target position of the object to be tested 200, the first detection member 10 can detect N vibration test values ​​of the object to be tested, and the second detection member 20 can detect N initial pressure parameters of the object to be tested.

[0055] S403: calibrating the vibration reference value according to the vibration test value;

[0056] According to N vibration reference values, a control model can be used to correct N vibration test values. The control model can be a simple multiple curve fitting or a deep learning model training to map the vibration test value to the vibration reference value. The control model can be used to obtain the deviation between the vibration reference value and the vibration test value, that is, the calibration value. Based on the calibration value, the control model can calculate the calibration value of each vibration test value. In the iterative process, the error is eliminated by continuously adjusting the control quantity parameters in the control model, so that the vibration test value is gradually brought close to the actual vibration reference value. The control quantity can refer to the weight and bias of the neural network model, or the parameters of the fitting curve, such as the intercept and slope of the fitting curve.

[0057] S404: If the calibration is successful, the control pressure parameters are adjusted to the preset parameters, and Figure 5 As shown, the driving unit 30 is controlled based on preset parameters;

[0058] like Figure 1As shown, after calibration, the control model will correct the vibration test value to the vibration reference value, and the pressure parameter corresponding to the vibration test value will also change accordingly. The initial pressure parameter is adjusted to the preset parameter. The calibrated vibration test value and the preset parameter can more accurately reflect the actual vibration characteristics of the object to be tested 200, thereby improving the accuracy and reliability of the test. Under the preset parameters, the control unit 40 controls the driving unit 30 to realize real-time contact detection between the first detection member 10 and the object to be tested 200, and ensure the accuracy and consistency of each detection.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A vibration detection device, characterized in that: The vibration detection device comprises: The first detection component is used to detect the vibration test value of the object to be tested; a second detection member, connected to the first detection member, and used for detecting in real time a pressure parameter corresponding to the vibration test value; a driving unit connected to the second detecting member, and configured to drive the second detecting member to move along a preset direction so that the first detecting member contacts the object to be detected; and A control unit is connected to the driving unit, controls the pressure parameter to be adjusted to a preset parameter, and controls the driving unit based on the preset parameter.

2. The vibration detection device according to claim 1, characterized in that: The vibration detecting device further includes a flexible unit disposed between the first detecting member and the second detecting member.

3. The vibration detection device according to claim 2, characterized in that: The first detecting member and the second detecting member are arranged at intervals along the preset direction.

4. The vibration detection device according to claim 1, characterized in that: The first detection component includes at least one of a temperature-vibration composite sensor and a vibration sensor.

5. The vibration detection device according to claim 1, characterized in that: The second detection member includes a compressive force sensor.

6. The vibration detection device according to claim 1, characterized in that: The driving unit comprises a driving part connected to the second detecting member and a transmission part connected to an output end of the driving part, and the driving part is used to drive the transmission part to move along the preset direction.

7. The vibration detection device according to claim 1, characterized in that: The control unit includes a data collector connected to the first detection member and the second detection member, a motion control card connected to the drive unit, and a computer connected to the data collector and the motion control card, the data collector is used to obtain the vibration test value and the pressure parameter, the computer is used to control the pressure parameter to be adjusted to a preset parameter, and control the drive unit through the motion control card based on the preset parameter.

8. The vibration detection device according to any one of claims 1 to 7, characterized in that: The vibration detection device further includes a load-bearing unit for supporting the driving unit and a shock-absorbing unit arranged on the load-bearing unit.

9. A control method for a vibration detection device according to any one of claims 1 to 8, characterized in that: The control method comprises: Obtaining a vibration reference value of the object to be measured at a target position; Acquire a vibration test value of the object to be tested at a target position and a pressure parameter corresponding to the vibration test value; calibrating the vibration reference value according to the vibration test value; and If the calibration is successful, the pressure parameter is controlled to be adjusted to a preset parameter, and the driving unit is controlled based on the preset parameter.

10. The control method of the vibration detection device according to claim 9, characterized in that: The method for obtaining the vibration reference value of the object to be measured at a target position includes: installing the third detection member at the target position using an adhesive to obtain the vibration reference value.

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