Overload Protection Method and Device for a Vibration Sensor Calibration System

Abstract

The present invention discloses an overload protection method and device for a vibration sensor calibration system, which relates to the technical field of sensor calibration. The method includes controlling a power amplifier to output a target excitation signal to a vibration table; obtaining target vibration data generated by the vibration table vibrating in response to the target excitation signal, and obtaining a target output voltage of a standard vibration sensor; determining a standard vibration duration of the vibration table and a standard voltage threshold range of the standard vibration sensor according to the target vibration data; and performing overload protection on the standard vibration sensor calibration system according to the standard vibration duration or the standard voltage threshold range. After adopting the above technical solution, the present invention can perform overload protection on the vibration sensor calibration system, and avoid the situation that the coil of the vibration table is overheated and burned out or the fuse is blown due to overheating of the power amplifier.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor calibration, and particularly to an overload protection method and device for a vibration sensor calibration system. Background Art

[0002] Currently, most vibration sensor calibration systems drive a vibration table to generate vibrations with different acceleration amplitudes by adjusting the output gain of a power amplifier, thereby changing the current output of the power amplifier. However, when increasing the acceleration amplitude, since the current output by the power amplifier is large and the vibration amplitude is usually small at high frequencies, if the output of the standard sensor placed on the vibration table is abnormal and the acceleration target value is not obtained, and the operator still continuously increases the output gain of the power amplifier, it is very easy to have an overload situation, resulting in the overheating and burning of the vibration table coil or the blowing of the overheat fuse of the power amplifier;

[0003] At the same time, due to different loads of the vibration table or different vibration acceleration amplitudes, the excitation force required by the vibration table and the corresponding current values and heat generation amounts also vary greatly. During actual calibration operations by the operator, the vibration table is prone to overheating and burning due to continuous vibration under high current, and the heat generation of the AC coil is too large.

[0004] First, it is difficult to achieve real-time overload protection for the vibration table through hardware devices for the alternating current output by the power amplifier; second, due to the narrow space of the vibration table coil position and during the vibration of the moving coil, it is difficult to measure the coil temperature in real time to evaluate whether it is necessary to stop the vibration of the vibration table. Therefore, the overload protection methods for current vibration sensor calibration systems are relatively few and it is impossible to accurately evaluate whether to perform overload protection.

[0005] In view of this, the present invention deeply conceives in view of the above-mentioned many deficiencies and inconveniences, and actively researches, improves and tries to develop and design the present invention. Summary of the Invention

[0006] The purpose of the present invention is to provide an overload protection method and device for a vibration sensor calibration system, which can perform overload protection on the vibration sensor calibration system, and avoid the overheating and burning of the vibration table coil or the malfunction of the supporting power amplifier due to overheating.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] The present invention provides an overload protection method for a vibration sensor calibration system. The vibration sensor calibration system includes a standard vibration sensor, a vibration table, and a power amplifier. The method includes:

[0009] Controlling the power amplifier to output a target excitation signal to the vibration table;

[0010] Obtain the target vibration data generated by the vibration table vibrating in response to the target excitation signal, and obtain the target output voltage of the standard vibration sensor;

[0011] Determine the standard vibration duration of the vibration table and the standard voltage threshold interval of the standard vibration sensor according to the target vibration data;

[0012] Perform overload protection on the standard vibration sensor calibration system according to the standard vibration duration or the standard voltage threshold interval.

[0013] Further, the performing overload protection on the vibration sensor calibration system according to the standard voltage threshold interval includes:

[0014] If the target output voltage exceeds the standard voltage threshold interval, control the power amplifier to stop outputting the target excitation signal to the vibration table, so as to perform overload protection on the vibration sensor calibration system.

[0015] Further, it further includes:

[0016] If the target output voltage does not exceed the standard voltage threshold interval, control the power amplifier to continue outputting the target excitation signal, so that the vibration table continues to vibrate.

[0017] Further, after the step of if the target output voltage exceeds the standard voltage threshold interval, control the power amplifier to stop outputting the target excitation signal to the vibration table to perform overload protection on the vibration sensor calibration system, it further includes:

[0018] Determine an adjusted excitation signal according to the target vibration data, use the adjusted excitation signal as the target excitation signal, and re - execute the step of controlling the power amplifier to output the target excitation signal to the vibration table until the target output voltage does not exceed the standard voltage threshold interval.

[0019] Further, the determining the standard vibration duration of the vibration table according to the target vibration data includes:

[0020] Determine the standard vibration duration of the vibration table according to the target vibration data and the preset load of the vibration table;

[0021] The performing overload protection on the vibration sensor calibration system according to the standard vibration duration includes:

[0022] Obtain the real - time vibration duration of the vibration table in response to the target excitation signal;

[0023] If the real-time vibration duration exceeds the standard vibration duration, control the power amplifier to stop outputting the target excitation signal to the vibration table to provide overload protection for the vibration table.

[0024] Further, before controlling the power amplifier to output the target excitation signal to the vibration table, it further includes:

[0025] Obtain the preset load capacity of the vibration table;

[0026] Determine the estimated current when the vibration table bears the preset load capacity according to the preset load capacity;

[0027] If the estimated current is not equal to the preset current, determine that the preset load capacity is incorrect;

[0028] If the estimated current is equal to the preset current, execute the step of controlling the power amplifier to output the target excitation signal to the vibration table.

[0029] Further, if the real-time vibration duration does not exceed the standard vibration duration, control the power amplifier to continue outputting the target excitation signal to the vibration table.

[0030] An overload protection device for a vibration sensor calibration system, which includes

[0031] An excitation signal output module for controlling the power amplifier to output a target excitation signal to the vibration table;

[0032] A first data acquisition module for acquiring target vibration data generated by the vibration table vibrating in response to the target excitation signal, and acquiring the output voltage of the standard vibration sensor under different excitation signals;

[0033] A second data acquisition module for determining the standard vibration duration of the vibration table under different excitation signals and the output voltage threshold range of the standard vibration sensor under different excitation signals;

[0034] An overload protection module for providing overload protection for the vibration sensor calibration system according to the standard vibration duration or the standard voltage threshold range.

[0035] After adopting the above technical solution, the present invention controls the power amplifier to output the target excitation signal to the vibration table, and provides overload protection for the vibration sensor calibration system through the standard vibration duration or the standard voltage threshold range, which can avoid the situation that the coil of the vibration table overheats and burns out or the fuse burns out due to the overheating of the power amplifier. Description of the Drawings

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 is a schematic structural diagram of the vibration sensor calibration system in the present invention.

[0038] Figure 2 is a module connection diagram of the overload protection device of the vibration sensor calibration system in the present invention.

[0039] Figure 3 is a flowchart of the overload protection method for the vibration sensor calibration system of the present invention.

[0040] Figure 4 is a flowchart of performing overload protection on the vibration sensor calibration system according to a standard voltage threshold range in the present invention.

[0041] Figure 5 is a flowchart of performing overload protection on the vibration sensor calibration system according to a standard vibration duration in the present invention. Detailed Embodiments

[0042] To further explain the technical solution of the present invention, the following will elaborate on the present invention through specific embodiments.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0044] Refer to Figure 1As shown in the figure, the present invention discloses a vibration sensor calibration system, which includes a vibration table 1, a standard vibration sensor (not shown in the figure), a signal conditioner 2, a data acquisition card 3, a power amplifier 4 and a computer 5. The standard vibration sensor is placed on the vibration table 1. The output end of the standard vibration sensor is connected to the input end of the signal conditioner 2. The output end of the signal conditioner 2 is connected to the input end of the data acquisition card 3. The output end of the data acquisition card 3 is connected to the input end of the power amplifier 4. The output end of the power amplifier 4 is connected to the input end of the vibration table 1. The data acquisition card 3 is connected to the computer 5.

[0045] The principle of vibration sensor calibration is that when the vibration table 1 reaches the set vibration state, by collecting the measured sensor signal amplified by the signal conditioner 2, and knowing the amplification factor of the signal conditioner 2, combined with the vibration state of the vibration table 1 measured by the standard sensor, the sensitivity of the measured sensor can be calculated by the comparison method.

[0046] The vibration sensor calibration system can read the vibration waveform of the vibration table 1 in real time through the standard vibration sensor placed on the vibration table 1. The signal is conditioned by the signal conditioner 2 and then input into the analog input channel of the data acquisition card 3. Since the sensitivity of the standard vibration sensor and the amplification factor of the signal conditioner 2 are known quantities, the actual vibration amplitude and frequency information of the vibration table 1 can be calculated by the output sensitivity of the signal conditioner 2. Then the data acquisition card 3 adjusts the amplitude of the generated sine signal to achieve the closed-loop control of the acceleration value of the vibration table 1.

[0047] As Figure 2 shown: An overload protection device for a vibration sensor calibration system, which includes

[0048] An excitation signal output module 10 for controlling the power amplifier to output a target excitation signal to the vibration table;

[0049] A first data acquisition module 20 for acquiring the target vibration data generated by the vibration table vibrating in response to the target excitation signal, and acquiring the output voltage of the standard vibration sensor under different excitation signals, that is, the target output voltage;

[0050] A second data acquisition module 30 for determining the standard vibration duration of the vibration table under different excitation signals and the output voltage threshold range of the standard vibration sensor under different excitation signals according to the target vibration data;

[0051] An overload protection module 40 for performing overload protection on the vibration sensor calibration system according to the standard vibration duration or the standard voltage threshold range.

[0052] As Figure 3As shown, the present invention provides an overload protection method for a vibration sensor calibration system, including:

[0053] Controlling the power amplifier 4 to output a target excitation signal to the vibration table 1;

[0054] Among them, the vibration table 1 is a vibration source for calibrating and detecting various types of vibration sensors. The vibration table 1 is also called a vibration exciter or a vibration generator. In practical applications, the vibration table 1 is connected to a coil placed in a magnetic field. After the excitation signal is input into the coil, the workbench connected to the coil can be driven to work.

[0055] Among them, the target excitation signal is an excitation sine signal for driving the vibration table 1 to work. Specifically, the controller controls the data acquisition card 3 to generate an initial excitation sine signal with a specific frequency and send it to the power amplifier 4. The power amplifier 4 amplifies the power of the initial excitation sine signal and then outputs the target excitation signal to the vibration table 1. The vibration table 1 works after being excited by the target excitation signal.

[0056] Among them, the vibration table 1 can be the vibration table 1 in the vibration sensor calibration system as Figure 1 shown; the controller can be the computer 5 in the vibration sensor calibration system as Figure 1 shown.

[0057] Obtaining the target vibration data generated by the vibration table in response to the target excitation signal vibration, and obtaining the target output voltage of the standard vibration sensor;

[0058] Among them, the vibration table 1 will generate the target vibration data after being excited by the target excitation signal to work; specifically, the workbench of the vibration table 1 will have different vibration information when vibrating under different working conditions. Exemplarily, usually, different vibration conditions of the vibration table 1 correspond to different vibration accelerations and vibration frequencies. The target vibration data can be the vibration acceleration and vibration frequency of the vibration table 1.

[0059] Among them, in practical applications, a standard vibration sensor is provided on the vibration table 1. When the vibration table 1 works, the standard vibration sensor outputs corresponding detection data after detecting the vibration change of the vibration table 1; specifically, the detection data can be the output voltage and frequency of the standard vibration sensor; obtaining the output voltage of the standard vibration sensor as the target output voltage.

[0060] Determining the standard vibration duration of the vibration table and the standard voltage threshold interval of the standard vibration sensor according to the target vibration data;

[0061] Overload protection is performed on the standard vibration sensor calibration system according to the standard vibration duration or the standard voltage threshold range.

[0062] Specifically: as Figure 4 shown, when performing overload protection on the vibration sensor calibration system according to the standard voltage threshold range:

[0063] The following steps are included:

[0064] Step 1: Control the power amplifier 4 to output a target excitation signal to the vibration table 1; that is, the computer 5 controls the data acquisition card 3 to output a target excitation signal, the power amplifier 4 amplifies the target excitation signal input by the data acquisition card 3, and outputs the target excitation signal to the vibration table 1;

[0065] Step 2: Obtain the target vibration data generated by the vibration table 1 vibrating in response to the target excitation signal, and obtain the target output voltage of the standard vibration sensor; that is, according to the vibration of the vibration table 1 at different vibration accelerations, the standard vibration sensor will correspondingly output different target output voltages and frequencies corresponding to different vibration acceleration values;

[0066] Step 3: Determine the standard voltage threshold range of the standard vibration sensor according to the target vibration data; that is, determine the standard voltage value range that the standard vibration sensor should output according to different vibration acceleration values, and compare the target output voltage of the standard vibration sensor obtained in Step 2 with the standard voltage threshold range determined in Step 3 to evaluate in real time whether the target output voltage meets the standard voltage threshold range;

[0067] Step 4: If the target output voltage exceeds the standard voltage threshold range, control the power amplifier 4 to stop outputting the target excitation signal to the vibration table 1 to perform overload protection on the vibration sensor calibration system;

[0068] Step 5: If the target output voltage does not exceed the standard voltage threshold range, control the power amplifier 4 to continue to output the target excitation signal to make the vibration table 1 continue to vibrate.

[0069] After performing overload protection on the standard vibration sensor in the above Step 4, it further includes: determining an adjusted excitation signal according to the target vibration data, using the adjusted excitation signal as the target excitation signal, and re-executing the step of controlling the power amplifier 4 to output the target excitation signal to the vibration table 1 until the target output voltage does not exceed the standard voltage threshold range. The way to adjust the excitation signal can be that the operator troubleshoots and resolves the abnormality of the output of the standard vibration sensor or the abnormal vibration of the vibration table 1.

[0070] The vibration sensor calibration system is overload protected by using a method of comparing the standard voltage threshold interval value. This can avoid the situation where, when the standard vibration sensor has no output or the output is abnormal, the power amplifier 4 continues to increase the target excitation signal output (and outputs alternating current), causing the coil of the vibration table 1 to overheat and burn out, or the power amplifier 4 to overheat and cause the fuse to burn out because the voltage output by the standard vibration sensor is not within the standard voltage threshold interval or the vibration table 1 does not obtain a vibration acceleration value.

[0071] like Figure 5 As shown, when the vibration sensor calibration system is overload protected according to the standard vibration duration, the following steps are included:

[0072] Step 1: Control the power amplifier 4 to output the target excitation signal to the vibration table 1; that is, the computer 5 controls the data acquisition card 3 to output the target excitation signal, the power amplifier 4 amplifies the target excitation signal input by the data acquisition card 3, and outputs the target excitation signal to the vibration table 1;

[0073] Step 2: Acquire target vibration data generated by the vibration table 1 in response to the target excitation signal; the target vibration data is the vibration acceleration and vibration frequency of the vibration table 1;

[0074] Step 3: Determine the standard vibration duration of the vibration table according to the target vibration data and the preset load of the vibration table 1; the standard vibration duration of the vibration table 1 is related to the wire diameter and winding length of the vibration table 1, and it is necessary to evaluate the heat generation and heat resistance level of the wire diameter and winding length of the vibration table 1. According to the evaluation results, a preliminary test of the continuous vibration of the vibration table 1 is performed, and the maximum duration of the continuous vibration of the vibration table 1 is recorded in the computer 5 program according to the working conditions of different loads and different vibration acceleration values, that is, the standard vibration duration. Different loads and different vibration accelerations have different standard vibration durations;

[0075] Step 4: Obtaining the real-time vibration duration of the vibration table 1 in response to the target excitation signal;

[0076] Step 5: If the real-time vibration duration exceeds the standard vibration duration, the power amplifier 4 is controlled to stop outputting the target excitation signal to the vibration table 1 to protect the vibration table from overload. Step 6: If the real-time vibration duration does not exceed the standard vibration duration, the power amplifier 4 is controlled to continue outputting the target excitation signal to the vibration table 1.

[0077] Before the above step 1, it also includes:

[0078] Obtain the preset load capacity of the vibration table 1 and determine the preset current of the vibration table 1 corresponding to the preset load capacity according to the preset load capacity; that is, since the weight of the moving parts of the vibration table 1 itself is fixed, according to the load capacity (preset load capacity) of the standard sensor to be measured, the magnitude of the direct current corresponding to the electromagnetic force for balancing the weight of the moving parts of the vibration table itself and the standard sensor to be measured can be recorded in advance through the computer program on the computer 5 (i.e., the preset current).

[0079] Determine the operating current of the vibration table 1 when it is loaded with the preset load capacity according to the preset load capacity; if the operating current is not equal to the preset current, it is determined that the preset load capacity is incorrect; at this time, re-measure the weight of the standard vibration sensor and re-enter the re-measured preset load capacity or troubleshoot the problem.

[0080] If the operating current is equal to the preset current, then execute the step of controlling the power amplifier 4 to output a target excitation signal to the vibration table 1.

[0081] Obtain the maximum vibration duration that the vibration table 1 can vibrate according to the weight of the standard vibration sensor and the vibration acceleration of the vibration table. When the longest vibration duration is reached, the computer 5 will control the data acquisition card 3 to output an excitation signal, and the power amplifier 4 will also stop outputting the target excitation signal, so that the vibration table 1 stops vibrating. This method can prevent the coil of the vibration table 1 from being burned due to overheating.

[0082] The computer 5 includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor can execute the steps of the above-mentioned method.

[0083] As mentioned above, it is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An overload protection method for a vibration sensor calibration system, characterized in that: The vibration sensor calibration system includes a standard vibration sensor, a vibration table, and a power amplifier. The overload protection method of the vibration sensor calibration system includes: Controlling the power amplifier to output a target excitation signal to the vibration table; Obtaining target vibration data generated by the vibration table vibrating in response to the target excitation signal, and obtaining the target output voltage of the standard vibration sensor; Determining the standard vibration duration of the vibration table and the standard voltage threshold range of the standard vibration sensor according to the target vibration data; Performing overload protection on the standard vibration sensor calibration system according to the standard vibration duration or the standard voltage threshold range; Wherein, determining the standard vibration duration of the vibration table according to the target vibration data includes: Determining the standard vibration duration of the vibration table according to the target vibration data and the preset load of the vibration table; Wherein, performing overload protection on the vibration sensor calibration system according to the standard vibration duration includes: Obtaining the real-time vibration duration of the vibration table in response to the target excitation signal; If the real-time vibration duration exceeds the standard vibration duration, controlling the power amplifier to stop outputting the target excitation signal to the vibration table to perform overload protection on the vibration table.

2. The overload protection method of a vibration sensor calibration system according to claim 1, wherein: Performing overload protection on the vibration sensor calibration system according to the standard voltage threshold range includes: If the target output voltage exceeds the standard voltage threshold range, controlling the power amplifier to stop outputting the target excitation signal to the vibration table to perform overload protection on the vibration sensor calibration system.

3. The overload protection method of a vibration sensor calibration system according to claim 2, characterized in that: It further includes: If the target output voltage does not exceed the standard voltage threshold range, controlling the power amplifier to continue outputting the target excitation signal to make the vibration table continue to vibrate.

4. The overload protection method of a vibration sensor calibration system according to claim 2, characterized in that: After performing overload protection on the vibration sensor calibration system by controlling the power amplifier to stop outputting the target excitation signal to the vibration table when the target output voltage exceeds the standard voltage threshold range, it further includes: Determining an adjusted excitation signal according to the target vibration data, using the adjusted excitation signal as the target excitation signal, and re-executing the step of controlling the power amplifier to output the target excitation signal to the vibration table until the target output voltage does not exceed the standard voltage threshold range.

5. The overload protection method of a vibration sensor calibration system according to claim 1, characterized in that: Before controlling the power amplifier to output the target excitation signal to the vibration table, it further includes: Obtaining the preset load of the vibration table and determining the preset current of the vibration table corresponding to the preset load according to the preset load; Determining the operating current of the vibration table when it is loaded with the preset load according to the preset load; If the operating current is not equal to the preset current, determining that the preset load is incorrect; If the operating current is equal to the preset current, performing the step of controlling the power amplifier to output the target excitation signal to the vibration table.

6. The overload protection method of a vibration sensor calibration system according to claim 1, characterized in that: If the real-time vibration duration does not exceed the standard vibration duration, controlling the power amplifier to continue outputting the target excitation signal to the vibration table.

7. An overload protection device for a vibration sensor calibration system, comprising: An excitation signal output module for controlling a power amplifier to output a target excitation signal to a vibration table; A first data acquisition module for acquiring target vibration data generated by the vibration table vibrating in response to the target excitation signal, and acquiring the output voltages of a standard vibration sensor under different excitation signals; A second data acquisition module for determining, according to the target vibration data, the standard vibration duration of the vibration table under different excitation signals and the output voltage threshold range of the standard vibration sensor under different excitation signals; An overload protection module for performing overload protection on the vibration sensor calibration system according to the standard vibration duration or the standard voltage threshold range; wherein the second data acquisition module is further configured to determine the standard vibration duration of the vibration table according to the target vibration data and the preset load capacity of the vibration table; wherein the overload protection module is further configured to acquire the real-time vibration duration of the vibration table in response to the target excitation signal; if the real-time vibration duration exceeds the standard vibration duration, the power amplifier is controlled to stop outputting the target excitation signal to the vibration table to perform overload protection on the vibration table.

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