A dynamic balance control method and device for horizontal low-pressure vibration test

Abstract

The present invention discloses a dynamic coil balance control method and device for a horizontal low-pressure vibration test. The dynamic coil speed is obtained by detecting the displacement of the dynamic coil, and the opening of the vacuum solenoid valve or the air source solenoid valve is adjusted according to the size of the dynamic coil speed by using a corresponding linear control function so that the speed of the dynamic coil is zero when it reaches the equilibrium position, so that the dynamic coil can quickly and smoothly return to the equilibrium position after exceeding the equilibrium position threshold. A dynamic coil balance control method for a horizontal low-pressure vibration test of the present invention solves the problem that the dynamic coil is difficult to accurately reach the equilibrium position, so that the dynamic coil can quickly and smoothly return to the equilibrium position after exceeding the equilibrium position threshold, and effectively ensures the control accuracy in the process of adjusting the dynamic coil position.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration platforms, and in particular to a method and a device for controlling the balance of a dynamic coil in a horizontal low-pressure vibration test. Background Art

[0002] Vibration tables are common vibration test equipment, widely used in aviation, aerospace, power batteries, electrical engineering, electronics, instrumentation, medical and other fields. Most existing vibration tables are used in normal pressure environments. Sometimes, vibration tests need to simulate actual working conditions, so a low-pressure environment is created in a sealed box, allowing vibration tests to be conducted in a low-pressure environment.

[0003] At present, there are many patents describing horizontal low-pressure vibration control methods in China. The existing horizontal low-pressure vibration control methods control one of the vacuum solenoid valve and the air source solenoid valve to be opened or both to be closed, and adjust the opening time ratio of the vacuum solenoid valve and the air source solenoid valve to maintain the balance of the moving coil. However, there are still the following problems in the control method:

[0004] 1. The existing horizontal low-pressure vibration control method adopts the method of controlling one of the vacuum solenoid valve and the air source solenoid valve to open to inflate and deflate the vacuum test vibration table during the process of maintaining the balance of the dynamic coil, so that the air pressure of the negative pressure test box and the vacuum test vibration table can be restored to the balance point. However, before the dynamic coil is balanced, the air pressure difference caused by the vibration test causes the dynamic coil to exceed the balance position threshold. When the vacuum test vibration table and the negative pressure test box air pressure are balanced, it is difficult for the dynamic coil to return to the balance position.

[0005] 2. In the existing horizontal low-pressure vibration control method, the vacuum solenoid valve and the air source solenoid valve are charged and discharged with a fixed opening in the process of maintaining the balance of the moving coil, and the opening time starts from the shortest opening time gear each time. The moving coil moves slowly, resulting in a long time for the moving coil to return to the equilibrium position.

[0006] 3. The existing horizontal low-pressure vibration control method controls the air source solenoid valve and the vacuum solenoid valve by increasing the solenoid valve opening time per second each time during the process of maintaining the balance of the moving coil. The solenoid valve control strategy is not adjusted according to the position of the moving coil, resulting in poor test control accuracy. Summary of the invention

[0007] In view of the above technical problems, the present invention proposes a method and device for controlling the balance of a moving coil in a horizontal low-pressure vibration test, so as to solve the problem that the existing low-pressure vibration test device is difficult to maintain the position balance of the moving coil and the control method is relatively simple.

[0008] A horizontal low-pressure vibration test dynamic coil balance control method comprises the following steps:

[0009] Step S1, placing the specimen on the specimen installation table, detecting the initial position of the moving coil by a displacement sensor, forming negative pressure inside the negative pressure test box and inside the vibration table body, so that the position of the moving coil is stable; starting the vacuum vibration test table, driving the specimen to vibrate on the specimen installation table;

[0010] Step S2, judging whether the dynamic coil exceeds the dynamic coil balance position threshold, the specific steps are as follows: the dynamic coil displacement before adjusting the dynamic coil position is , the moving coil moves toward the negative pressure test chamber Is positive, the moving coil moves toward the vibration table Negative; the displacement sensor detects the dynamic displacement in real time , and determine whether it satisfies ,in: is the dynamic coil balance position threshold; if it is not satisfied , then execute step S3; if satisfied , then repeat step S2;

[0011] Step S3, the displacement of the moving coil during the adjustment process is detected by the displacement sensor to calculate the moving coil speed, and a linear control function is used to adjust the opening of the vacuum solenoid valve connecting the second vacuum pump and the vibration table body or the opening of the air source solenoid valve connecting the high-pressure air source and the vibration table body, so that the speed of the moving coil is zero when it reaches the equilibrium position. The specific steps are as follows:

[0012] like , indicating that the moving coil moves toward the negative pressure test box, the vacuum solenoid valve is opened, and the initial opening of the vacuum solenoid valve is Then, according to the speed of the moving coil, the corresponding linear control function is used to adjust the opening of the vacuum solenoid valve, so that the moving coil quickly approaches the equilibrium position;

[0013] like , indicating that the dynamic coil moves toward the vibration table body, the air source solenoid valve is opened, and the initial opening of the air source solenoid valve is Then, according to the speed of the moving coil, the corresponding linear control function is used to adjust the opening of the air source solenoid valve, so that the moving coil quickly approaches the equilibrium position;

[0014] Step S4: Complete the test and take out the test piece.

[0015] Beneficial effect: The dynamic coil balance control method for horizontal low-pressure vibration test proposed in the present invention obtains the dynamic coil speed by detecting the displacement of the dynamic coil, and adjusts the opening of the vacuum solenoid valve or the air source solenoid valve to make the speed of the dynamic coil zero when it reaches the equilibrium position, so that the dynamic coil can quickly and smoothly return to the equilibrium position after exceeding the equilibrium position threshold.

[0016] In an optional implementation, the step S3 adjusts the vacuum solenoid valve or the air source solenoid valve to open according to the position of the moving coil, and adopts different control methods according to the distance between the moving coil and the equilibrium position, specifically:

[0017] In satisfying When the moving coil is moved, the opening of the vacuum solenoid valve or the opening of the gas source solenoid valve is adjusted according to the moving coil speed by using a linear control function with a first slope, so that the moving coil quickly approaches the equilibrium position;

[0018] In satisfying When the moving coil moves smoothly, the linear control function with the second slope is used to adjust the opening of the vacuum solenoid valve or the opening of the gas source solenoid valve according to the moving coil speed;

[0019] In satisfying When the vacuum solenoid valve opening or the gas source solenoid valve opening is adjusted by using the opening-displacement control function, wherein the first slope>the second slope;

[0020] For the The displacement of the moving coil at the moment, is the first distance coefficient, ranging from 0.5 to 0.6; is the second distance coefficient, ranging from 0.8 to 0.9;

[0021] is the distance between the initial adjustment position of the moving coil and the initial position of the moving coil;

[0022] , is the sampling number; the position farthest from the initial position of the moving coil is the initial adjustment position. .

[0023] Beneficial effect: The dynamic coil balance control method for the horizontal low-pressure vibration test proposed in the present invention adopts different control methods according to the distance of the dynamic coil from the balance position during the process of adjusting the dynamic coil position. When the distance is far, a linear control function with a larger slope is used to adjust the opening of the vacuum solenoid valve or the air source solenoid valve to make the dynamic coil quickly approach the balance position. When the distance is medium, a linear control function with a smaller slope is used to adjust the opening of the vacuum solenoid valve or the air source solenoid valve to make the dynamic coil move smoothly. When the distance is close, a displacement-related control function is used to adjust the opening of the vacuum solenoid valve or the air source solenoid valve, thereby effectively ensuring the control accuracy in the process of adjusting the dynamic coil position.

[0024] In an optional implementation, if , that is, Momentary dynamic displacement When the distance is the first distance, execute step S31 S32, calculating the moving coil velocity;

[0025] Step S31: The displacement sensor collects the Momentary dynamic displacement Calculate the moving coil speed , and judge in real time whether it is satisfied ,in: is the lower limit of the moving coil speed threshold for the first distance; is the upper limit of the first distance moving circle speed threshold; if it does not meet , then adjust the vacuum solenoid valve opening or the gas source solenoid valve opening, specifically:

[0026] When adjusting the vacuum solenoid valve opening, ;

[0027] When adjusting the opening of the gas source solenoid valve, ; and repeat step S31, wherein: is the initial opening of the vacuum solenoid valve; is the initial opening of the gas source solenoid valve; is the first distance solenoid valve opening control coefficient; is the first distance speed threshold mean, The calculation formula is If satisfied , then keep the solenoid valve opening unchanged, and then execute step S32;

[0028] Step S32: The displacement sensor collects the Momentary dynamic displacement And determine whether it satisfies If you are not satisfied , then return to step S31; if satisfied , then execute step S33;

[0029] Step S33: If , that is, Momentary dynamic displacement When the distance is the second, the control steps are as follows: the displacement sensor collects the Momentary dynamic displacement Calculate the moving coil speed , and judge in real time whether it is satisfied ,in: is the lower limit of the moving coil speed threshold for the second distance;

[0030] is the upper limit of the moving coil speed threshold for the second distance; ;like Dissatisfied , then adjust the opening of the vacuum solenoid valve or the gas source solenoid valve , and repeat step S5, wherein: It is the opening degree of the vacuum solenoid valve or the gas source solenoid valve when the moving coil just enters the second distance stage; is the opening control coefficient of the second distance vacuum solenoid valve or gas source solenoid valve, ; is the second distance speed threshold mean, The calculation formula is If satisfied , then keep the vacuum solenoid valve or the gas source solenoid valve open, and then execute step S34;

[0031] Step S34: The displacement sensor collects the Momentary dynamic displacement And determine whether it satisfies If not satisfied , then return to step S33; if satisfied , then execute step S35;

[0032] Step S35: When the , that is, Momentary dynamic displacement When the distance is the third distance, the specific control steps are as follows: close the vacuum solenoid valve or the gas source solenoid valve, and the displacement sensor collects the Momentary dynamic displacement Calculate the moving coil speed ,when When If you are not satisfied , then execute step S36; if satisfied , the vibration test ends;

[0033] Step S36: If , then open the gas source solenoid valve, the gas source solenoid valve opening ,in: is the moving coil speed in step S35 When the moving coil is displaced, When , return to step S35; if satisfied , then open the vacuum solenoid valve, the vacuum solenoid valve opening ,when , return to step S35.

[0034] Beneficial effects: The dynamic coil displacement stage is further subdivided and the opening of the vacuum solenoid valve or the air source solenoid valve and the dynamic coil speed are adjusted in a targeted manner. The corresponding thresholds and control coefficients are set at different distance stages, so that the motion state of the dynamic coil at each stage in the process of returning to the equilibrium position is more controllable. The opening of the vacuum solenoid valve or the air source solenoid valve is dynamically adjusted by the dynamic coil speed and displacement, which prevents the dynamic coil from crossing the equilibrium position or causing large fluctuations due to excessive speed or improper control when approaching the equilibrium position, effectively improving the accuracy and stability of the dynamic coil returning to the equilibrium position, thereby improving the reliability of the entire horizontal low-pressure vibration test device.

[0035] In an optional embodiment, the formula Calculate the moving coil velocity, where: For the dynamic circle Time speed, For the The displacement of the moving coil at the moment, For the Momentary dynamic displacement ,remember Dynamic speed .

[0036] In an optional implementation, the moving coil balance position threshold The value range is 0.5mm~1.0mm.

[0037] Beneficial effect: The dynamic coil balance position threshold of 0.5mm~1.0mm can effectively reduce the frequent triggering of the adjustment mechanism due to small displacement fluctuations caused by dynamic coil vibration while ensuring the dynamic coil balance accuracy, avoid system over-adjustment, reduce system energy consumption and equipment wear, and ensure that effective control can be carried out in time when the dynamic coil displacement exceeds a reasonable range to maintain the stable operation of the test device.

[0038] In an optional embodiment, the initial opening of the gas source solenoid valve The value range is 0.4~0.6, the initial opening of the vacuum solenoid valve The value range is 0.4~0.6.

[0039] Beneficial effect: The initial opening of the air source solenoid valve and the vacuum solenoid valve within this value range can avoid the initial opening being too large, which will cause drastic changes in air pressure and make the dynamic movement unstable, and can also prevent the initial opening from being too small, which will make the dynamic adjustment speed too slow. It helps to speed up the movement of the dynamic coil to the equilibrium position while ensuring its smooth movement, thereby improving the adjustment efficiency and system response performance.

[0040] In an optional implementation, the first distance moving coil speed lower threshold The value range is 8mm / s ~9mm / s; the upper limit of the first distance moving coil speed threshold The value range is 10 mm / s~11 mm / s;

[0041] Second distance moving coil speed threshold lower limit The value range is 7 mm / s ~8 mm / s; the upper limit of the second distance moving coil speed threshold The value range is 8mm / s ~9mm / s.

[0042] Beneficial effects: These threshold ranges are set based on the motion characteristics and control requirements of the dynamic coil at different displacement stages, and can accurately define the reasonable range of the dynamic coil speed. When the dynamic coil speed exceeds the corresponding threshold, timely adjustment of the solenoid valve opening can effectively prevent the dynamic coil from deviating from the expected trajectory due to excessive speed or slow speed, ensure the motion stability and adjustment accuracy of the dynamic coil at different stages, and ensure the reliability of the entire test process.

[0043] In an optional implementation, the first distance solenoid valve opening control coefficient The value range is 0.06~0.07; the second distance solenoid valve opening control coefficient The value range is 0.03~0.04.

[0044] Beneficial effect: When the distance is far, a larger control coefficient is used, which can make the solenoid valve opening have a more obvious regulating effect on the displacement change of the moving coil, and quickly shorten the distance between the moving coil and the equilibrium position; when the distance is close, a smaller control coefficient is used to achieve fine adjustment of the solenoid valve opening, avoiding overshoot or instability of the moving coil due to excessive adjustment, thereby improving the control accuracy and stability of the entire moving coil position adjustment process.

[0045] The present invention further discloses a horizontal low-pressure vibration test device, which uses the horizontal low-pressure vibration test dynamic coil balance control method, including a negative pressure test box, a vacuum vibration test table and a control unit, wherein the negative pressure test box includes a negative pressure box body, a first vacuum pump for forming negative pressure in the negative pressure box body, a support table extending from the bottom wall into the negative pressure box body, a test piece installation table surface slidably arranged on the support table, and a connector connecting the test piece installation table surface and the dynamic coil;

[0046] The vacuum vibration test bench includes a vibration table body, a moving coil connected to the vibration table body to output vibration, a second vacuum pump connected to the vibration table body, a high-pressure gas source connected to the vibration table body, and a displacement sensor for detecting the position of the moving coil;

[0047] It also includes a vacuum solenoid valve connecting the second vacuum pump and the vibration table body, an air source solenoid valve connecting the high-pressure air source and the vibration table body, a back-pressure solenoid valve for connecting the negative pressure box and external air, and a negative pressure solenoid valve for controlling the on and off of the first vacuum pump;

[0048] The signal input end of the control unit is connected to the displacement sensor, and the signal output end is connected to the vacuum solenoid valve, the air source solenoid valve, the back pressure solenoid valve and the negative pressure solenoid valve.

[0049] In an optional implementation, the vacuum solenoid valve and the gas source solenoid valve are both proportional communication solenoid valves.

[0050] In summary, the dynamic coil balance control method for horizontal low-pressure vibration test proposed in the present invention solves the problem that the dynamic coil is difficult to accurately reach the balance position, so that the dynamic coil can quickly and smoothly return to the balance position after exceeding the balance position threshold, effectively ensuring the control accuracy in the process of adjusting the dynamic coil position. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural principle diagram of the present invention;

[0052] Figure 2 is a control flow chart of the present invention;

[0053] Figure 3 This is the moving coil position adjustment control flow chart.

[0054] Description of reference numerals:

[0055] 1. Second vacuum pump; 2. Vibration table body; 3. Vacuum solenoid valve; 4. First vacuum pump; 5. Negative pressure solenoid valve; 6. Negative pressure test chamber; 7. High-pressure gas source; 8. Gas source solenoid valve; 9. Moving coil; 10. Connectors; 11. Specimen mounting table; 12. Support table. DETAILED DESCRIPTION

[0056] The present invention will be further described below in conjunction with the embodiments in the accompanying drawings so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0057] like Figure 2 As shown, the present invention provides a dynamic balance control method for a horizontal low-pressure vibration test, comprising the following steps:

[0058] Step S1, placing the specimen on the specimen installation table, detecting the initial position of the moving coil by a displacement sensor, forming negative pressure inside the negative pressure test box and inside the vibration table body, so that the position of the moving coil is stable; starting the vacuum vibration test table, driving the specimen to vibrate on the specimen installation table;

[0059] Step S2, judging whether the dynamic coil exceeds the dynamic coil balance position threshold, the specific steps are as follows: the dynamic coil displacement before adjusting the dynamic coil position is , the moving coil moves toward the negative pressure test chamber Is positive, the moving coil moves toward the vibration table Negative; the displacement sensor detects the dynamic displacement in real time , and determine whether it satisfies ,in: is the dynamic coil balance position threshold; if it is not satisfied , then execute step S3; if satisfied , then repeat step S2;

[0060] Step S3, the displacement of the moving coil during the adjustment process is detected by the displacement sensor to calculate the moving coil speed, and a linear control function is used to adjust the opening of the vacuum solenoid valve 3 connecting the second vacuum pump 1 and the vibration table body 2 or to adjust the opening of the air source solenoid valve 8 connecting the high-pressure air source 7 and the vibration table body 2, so that the speed of the moving coil is zero when it reaches the equilibrium position. The specific steps are as follows:

[0061] like , indicating that the moving coil moves toward the negative pressure test box, the vacuum solenoid valve is opened, and the initial opening of the vacuum solenoid valve is Then, the corresponding linear control function is used to adjust the opening of the vacuum solenoid valve according to the speed of the moving coil, so that the moving coil quickly approaches the equilibrium position;

[0062] like , indicating that the dynamic coil moves toward the vibration table body, the air source solenoid valve is opened, and the initial opening of the air source solenoid valve is Then, according to the speed of the moving coil, the corresponding linear control function is used to adjust the opening of the air source solenoid valve, so that the moving coil quickly approaches the equilibrium position;

[0063] Step S4: Complete the test and take out the test piece.

[0064] The present invention discloses a dynamic coil balance control method for a horizontal low-pressure vibration test. The dynamic coil speed is obtained by detecting the displacement of the dynamic coil, and the opening of a vacuum solenoid valve or an air source solenoid valve is adjusted so that the speed of the dynamic coil is zero when the dynamic coil reaches a balanced position, so that the dynamic coil can quickly and smoothly return to the balanced position after exceeding the balanced position threshold.

[0065] In an optional implementation, the step S3 adjusts the vacuum solenoid valve or the air source solenoid valve to open according to the position of the moving coil, and adopts different control methods according to the distance between the moving coil and the equilibrium position, specifically:

[0066] In satisfying When the moving coil is moved, the opening of the vacuum solenoid valve or the opening of the gas source solenoid valve is adjusted according to the moving coil speed by using a linear control function with a first slope, so that the moving coil quickly approaches the equilibrium position;

[0067] In satisfying When the moving coil moves smoothly, the linear control function with the second slope is used to adjust the opening of the vacuum solenoid valve or the opening of the gas source solenoid valve according to the moving coil speed;

[0068] In satisfying When the vacuum solenoid valve opening or the gas source solenoid valve opening is adjusted by using the opening-displacement control function, wherein the first slope>the second slope;

[0069] For the The displacement of the moving coil at the moment, is the first distance coefficient, ranging from 0.5 to 0.6; is the second distance coefficient, ranging from 0.8 to 0.9;

[0070] is the distance between the initial adjustment position of the moving coil and the initial position of the moving coil;

[0071] , is the sampling number; the position farthest from the initial position of the moving coil is the initial adjustment position. .

[0072] The dynamic coil balance control method for a horizontal low-pressure vibration test proposed in the present invention adopts different control methods according to the distance of the dynamic coil from the balance position during the process of adjusting the dynamic coil position. When the distance is far, a linear control function with a larger slope is used to adjust the opening of the vacuum solenoid valve or the air source solenoid valve so that the dynamic coil quickly approaches the balance position. When the distance is medium, a linear control function with a smaller slope is used to adjust the opening of the vacuum solenoid valve or the air source solenoid valve so that the dynamic coil moves smoothly. When the distance is close, a displacement-related control function is used to adjust the opening of the vacuum solenoid valve or the air source solenoid valve, thereby effectively ensuring the control accuracy in the process of adjusting the dynamic coil position.

[0073] In an optional implementation, if , that is, Momentary dynamic displacement When the distance is the first distance, execute step S31 S32, calculating the moving coil velocity;

[0074] Step S31: The displacement sensor collects the Momentary dynamic displacement Calculate the moving coil speed , and judge in real time whether it is satisfied ,in: is the lower limit of the moving coil speed threshold for the first distance; is the upper limit of the first distance moving circle speed threshold; if it does not meet , then adjust the vacuum solenoid valve opening or the gas source solenoid valve opening, specifically:

[0075] When adjusting the vacuum solenoid valve opening, ;

[0076] When adjusting the opening of the gas source solenoid valve, ; and repeat step S31, wherein: is the initial opening of the vacuum solenoid valve; is the initial opening of the gas source solenoid valve; is the first distance solenoid valve opening control coefficient; is the first distance speed threshold mean, The calculation formula is If satisfied , then keep the solenoid valve opening unchanged, and then execute step S32;

[0077] Step S32: The displacement sensor collects the Momentary dynamic displacement And determine whether it satisfies If you are not satisfied , then return to step S31; if satisfied , then execute step S33;

[0078] Step S33: If , that is, Momentary dynamic displacement When the distance is the second, the control steps are as follows: the displacement sensor collects the Momentary dynamic displacement Calculate the moving coil speed , and judge in real time whether it is satisfied ,in: is the lower limit of the moving coil speed threshold for the second distance;

[0079] is the upper limit of the moving coil speed threshold for the second distance; ;like Dissatisfied , then adjust the opening of the vacuum solenoid valve or the gas source solenoid valve , and repeat step S5, wherein: It is the opening degree of the vacuum solenoid valve or the gas source solenoid valve when the moving coil just enters the second distance stage; is the opening control coefficient of the second distance vacuum solenoid valve or gas source solenoid valve, ; is the second distance speed threshold mean, The calculation formula is If satisfied , then keep the vacuum solenoid valve or the gas source solenoid valve open, and then execute step S34;

[0080] Step S34: The displacement sensor collects the Momentary dynamic displacement And determine whether it satisfies If not satisfied , then return to step S33; if satisfied , then execute step S35;

[0081] Step S35: When the , that is, Momentary dynamic displacement When the distance is the third distance, the specific control steps are as follows: close the vacuum solenoid valve or the gas source solenoid valve, and the displacement sensor collects the Momentary dynamic displacement Calculate the moving coil speed ,when When If you are not satisfied , then execute step S36; if satisfied , the vibration test ends;

[0082] Step S36: If , then open the gas source solenoid valve, the gas source solenoid valve opening ,in: is the moving coil speed in step S35 When the moving coil is displaced, When , return to step S35; if satisfied , then open the vacuum solenoid valve, the vacuum solenoid valve opening ,when , return to step S35.

[0083] The present invention further subdivides the moving coil displacement stage and specifically adjusts the opening of the vacuum solenoid valve or the air source solenoid valve and the moving coil speed, sets corresponding thresholds and control coefficients at different distance stages, and makes the moving coil more controllable in each stage of the process of returning to the equilibrium position. The opening of the vacuum solenoid valve or the air source solenoid valve is dynamically adjusted by the moving coil speed and displacement, which prevents the moving coil from crossing the equilibrium position or generating large fluctuations due to excessive speed or improper control when approaching the equilibrium position, effectively improving the accuracy and stability of the moving coil returning to the equilibrium position, thereby improving the reliability of the entire horizontal low-pressure vibration test device.

[0084] In an optional embodiment, the formula Calculate the moving coil velocity, where: For the dynamic circle Time speed, For the The displacement of the moving coil at the moment, For the Momentary dynamic displacement ,remember Dynamic speed .

[0085] In an optional implementation, the moving coil balance position threshold The value range is 0.5mm~1.0mm.

[0086] The dynamic coil balance position threshold of 0.5mm~1.0mm can effectively reduce the frequent triggering of the adjustment mechanism due to small displacement fluctuations caused by dynamic coil vibration while ensuring the dynamic coil balance accuracy, avoid system over-adjustment, reduce system energy consumption and equipment wear, and ensure that effective control can be carried out in time when the dynamic coil displacement exceeds a reasonable range to maintain the stable operation of the test device.

[0087] In an optional embodiment, the initial opening of the gas source solenoid valve The value range is 0.4~0.6, the initial opening of the vacuum solenoid valve The value range is 0.4~0.6.

[0088] It can be understood that the initial opening of the air source solenoid valve and the vacuum solenoid valve within this value range can not only avoid the initial opening being too large, causing drastic changes in air pressure and making the moving coil unstable, but also prevent the initial opening being too small, causing the moving coil to adjust too slowly. This helps to speed up the moving coil's movement to the equilibrium position while ensuring its smooth movement, thereby improving the adjustment efficiency and system response performance.

[0089] In an optional implementation, the first distance moving coil speed lower threshold The value range is 8mm / s ~9mm / s; the upper limit of the first distance moving coil speed threshold The value range is 10 mm / s~11 mm / s;

[0090] Second distance moving coil speed threshold lower limit The value range is 7 mm / s ~8 mm / s; the upper limit of the second distance moving coil speed threshold The value range is 8mm / s ~9mm / s.

[0091] The setting of these threshold ranges is based on the motion characteristics and control requirements of the dynamic coil at different displacement stages, and can accurately define the reasonable range of the dynamic coil speed. When the dynamic coil speed exceeds the corresponding threshold, timely adjustment of the solenoid valve opening can effectively prevent the dynamic coil from deviating from the expected trajectory due to excessive speed or slow speed, ensure the motion stability and adjustment accuracy of the dynamic coil at different stages, and ensure the reliability of the entire test process.

[0092] In an optional implementation, the first distance solenoid valve opening control coefficient The value range is 0.06~0.07; the second distance solenoid valve opening control coefficient The value range is 0.03~0.04.

[0093] When the distance is far, using a larger control coefficient can make the solenoid valve opening have a more obvious regulating effect on the dynamic displacement change, and quickly shorten the distance between the dynamic coil and the equilibrium position; when the distance is close, using a smaller control coefficient can achieve fine adjustment of the solenoid valve opening, avoiding overshoot or instability of the dynamic coil due to excessive adjustment range, thereby improving the control accuracy and stability of the entire dynamic coil position adjustment process.

[0094] like Figure 1 As shown, the present invention further discloses a horizontal low-pressure vibration test device, using the horizontal low-pressure vibration test dynamic coil balance control method, including a negative pressure test box, a vacuum vibration test table and a control unit, wherein the negative pressure test box includes a negative pressure box body, a first vacuum pump for forming a negative pressure in the negative pressure box body, a support table extending from the bottom wall into the negative pressure box body, a test piece installation table surface slidably arranged on the support table, and a connector connecting the test piece installation table surface and the dynamic coil;

[0095] The vacuum vibration test bench includes a vibration table body, a moving coil connected to the vibration table body to output vibration, a second vacuum pump connected to the vibration table body, a high-pressure gas source connected to the vibration table body, and a displacement sensor for detecting the position of the moving coil;

[0096] It also includes a vacuum solenoid valve connecting the second vacuum pump and the vibration table body, an air source solenoid valve connecting the high-pressure air source and the vibration table body, a back-pressure solenoid valve for connecting the negative pressure box and external air, and a negative pressure solenoid valve for controlling the on and off of the first vacuum pump;

[0097] The signal input end of the control unit is connected to the displacement sensor, and the signal output end is connected to the vacuum solenoid valve, the air source solenoid valve, the back pressure solenoid valve and the negative pressure solenoid valve.

[0098] In an optional implementation, the vacuum solenoid valve and the gas source solenoid valve are both proportional communication solenoid valves.

[0099] In summary, the dynamic coil balance control method for horizontal low-pressure vibration test proposed in the present invention solves the problem that the dynamic coil is difficult to accurately reach the balance position, so that the dynamic coil can quickly and smoothly return to the balance position after exceeding the balance position threshold, effectively ensuring the control accuracy in the process of adjusting the dynamic coil position.

Claims

1. A method for controlling the balance of a dynamic coil in a horizontal low-pressure vibration test, characterized in that: The steps include: Step S1, placing the specimen on the specimen installation table, detecting the initial position of the moving coil by means of a displacement sensor, forming negative pressure inside the negative pressure test box and the vibration table body, so that the position of the moving coil is stable; starting the vacuum vibration test table, driving the specimen to vibrate on the specimen installation table; Step S2, judging whether the dynamic coil exceeds the dynamic coil balance position threshold, the specific steps are as follows: the dynamic coil displacement before adjusting the dynamic coil position is , the moving coil moves toward the negative pressure test chamber Is positive, the moving coil moves toward the vibration table Negative; the displacement sensor detects the dynamic displacement in real time , and determine whether it satisfies ,in: is the dynamic coil balance position threshold; if it is not satisfied , then execute step S3; if satisfied , then repeat step S2; Step S3, using a displacement sensor to detect the displacement of the moving coil during the adjustment process and calculate the speed of the moving coil, using a linear control function to adjust the opening of the vacuum solenoid valve (3) connecting the second vacuum pump (1) and the vibration table (2) or to adjust the opening of the air source solenoid valve (8) connecting the high-pressure air source (7) and the vibration table (2), so that the speed of the moving coil is zero when it reaches the equilibrium position. The specific steps are as follows: like , indicating that the moving coil moves toward the negative pressure test chamber, the vacuum solenoid valve is turned on, and then the opening of the vacuum solenoid valve is adjusted according to the speed of the moving coil using the corresponding linear control function; like , indicating that the moving coil moves toward the vibration table body, the air source solenoid valve is turned on, and then the corresponding linear control function is used to adjust the opening of the air source solenoid valve according to the speed of the moving coil; Step S4, complete the test and take out the test piece; The step S3 adjusts the vacuum solenoid valve or the air source solenoid valve to open according to the position of the moving coil, and adopts different control methods according to the distance between the moving coil and the equilibrium position, specifically: In satisfying When the vacuum solenoid valve opening or the gas source solenoid valve opening is adjusted according to the moving coil speed, a linear control function with a first slope is used; In satisfying When the vacuum solenoid valve opening or the gas source solenoid valve opening is adjusted according to the moving coil speed, a linear control function with a second slope is used; In satisfying When the vacuum solenoid valve opening or the gas source solenoid valve opening is adjusted by using the opening-displacement control function, wherein the first slope>the second slope; for The dynamic displacement at the moment, is the first distance coefficient, ranging from 0.5 to 0.6; is the second distance coefficient, ranging from 0.8 to 0.9; is the distance between the initial adjustment position of the moving coil and the initial position of the moving coil; , is the sampling number; the position farthest from the initial position of the moving coil is the initial adjustment position. .

2. The horizontal low-pressure vibration test dynamic coil balance control method according to claim 1 is characterized in that: If satisfied ,Right now Momentary dynamic displacement When the distance is the first distance, execute step S31 S32, calculating the moving coil velocity; Step S31: Calculate Dynamic speed , and judge in real time whether it is satisfied ,in: is the lower limit of the moving coil speed threshold for the first distance; is the upper limit of the first distance moving circle speed threshold; if it does not meet , then adjust the vacuum solenoid valve opening or the gas source solenoid valve opening, specifically: When adjusting the vacuum solenoid valve opening, ; When adjusting the opening of the gas source solenoid valve, ; and repeat step S31, wherein: is the initial opening of the vacuum solenoid valve; is the initial opening of the gas source solenoid valve; is the first distance solenoid valve opening control coefficient; is the first distance speed threshold mean, The calculation formula is If satisfied , then keep the solenoid valve opening unchanged, and then execute step S32; Step S32: real-time acquisition by displacement sensor Momentary dynamic displacement And determine whether it satisfies If you are not satisfied , then return to step S31; if satisfied , then execute step S33; Step S33: If ,Right now Momentary dynamic displacement When it is the second distance, the control steps are as follows: Calculate Dynamic speed , and judge in real time whether it is satisfied ,in: is the lower limit of the moving coil speed threshold for the second distance; is the upper limit of the moving coil speed threshold for the second distance; ; like Dissatisfied , then adjust the opening of the vacuum solenoid valve or the gas source solenoid valve , and repeat step S5, wherein: It is the opening degree of the vacuum solenoid valve or the gas source solenoid valve when the moving coil just enters the second distance stage; is the opening control coefficient of the second distance vacuum solenoid valve or gas source solenoid valve, ; is the second distance speed threshold mean, The calculation formula is If satisfied , then keep the vacuum solenoid valve or the gas source solenoid valve open, and then execute step S34; Step S34: The displacement sensor collects the Momentary dynamic displacement And determine whether it satisfies If not satisfied , then return to step S33; if satisfied , then execute step S35; Step S35: When the ,Right now Momentary dynamic displacement When the distance is the third distance, the specific control steps are as follows: close the vacuum solenoid valve or the gas source solenoid valve, and calculate Dynamic speed ,when When If you are not satisfied , then execute step S36; if satisfied , the vibration test ends; Step S36: If , then open the gas source solenoid valve, the gas source solenoid valve opening ,in: is the moving coil speed in step S35 When the moving coil is displaced, When , return to step S35; if satisfied , then open the vacuum solenoid valve, the vacuum solenoid valve opening ,when , return to step S35.

3. The dynamic balance control method for horizontal low-pressure vibration test according to claim 1 is characterized in that: Using formula Calculate the moving coil velocity, where: For dynamic Time speed, for The dynamic displacement at the moment, for Momentary dynamic displacement ,remember Dynamic speed .

4. The horizontal low-pressure vibration test dynamic coil balance control method according to claim 1, characterized in that: The moving coil balance position threshold The value range is 0.5mm~1.0mm.

5. The horizontal low-pressure vibration test dynamic coil balance control method according to claim 2, characterized in that: Initial opening of the gas source solenoid valve The value range is 0.4~0.6, the initial opening of the vacuum solenoid valve The value range is 0.4~0.

6.

6. The horizontal low-pressure vibration test dynamic coil balance control method according to claim 2, characterized in that: The first distance moving coil speed threshold lower limit The value range is 8mm / s ~9mm / s; The upper limit of the first distance moving coil speed threshold The value range is 10 mm / s~11 mm / s; Second distance moving coil speed threshold lower limit The value range is 7 mm / s ~8 mm / s; The upper limit of the second distance moving coil speed threshold The value range is 8mm / s ~9mm / s.

7. The dynamic balance control method for horizontal low-pressure vibration test according to claim 2 is characterized in that: The first distance solenoid valve opening control coefficient The value range is 0.06~0.07; the second distance solenoid valve opening control coefficient The value range is 0.03~0.

04.

8. A horizontal low-pressure vibration test device, using the horizontal low-pressure vibration test dynamic balance control method as described in any one of claims 1 to 7, characterized in that: It comprises a negative pressure test box (6), a vacuum vibration test bench and a control unit, wherein: The negative pressure test box comprises a negative pressure box body, a first vacuum pump (4) for forming negative pressure in the negative pressure box body, a support platform (12) protruding from the bottom wall into the negative pressure box body, a test piece mounting table (11) slidably arranged on the support platform, and a connecting piece (10) connecting the test piece mounting table and the moving coil (9); The vacuum vibration test bench comprises a vibration table body (2), a moving coil (9) connected to the vibration table body (2) for outputting vibration, a second vacuum pump (1) connected to the vibration table body (2), a high-pressure gas source (7) connected to the vibration table body (2), and a displacement sensor for detecting the position of the moving coil (9); It also includes a vacuum solenoid valve (3) connecting the second vacuum pump (1) and the vibration table (2), an air source solenoid valve (8) connecting the high-pressure air source (7) and the vibration table (2), a back-pressure solenoid valve for connecting the negative pressure box and external air, and a negative pressure solenoid valve (5) for controlling the on and off of the first vacuum pump (4); The signal input end of the control unit is connected to the displacement sensor, and the signal output end is connected to the vacuum solenoid valve (3), the air source solenoid valve (8), the back pressure solenoid valve and the negative pressure solenoid valve (5).

9. The horizontal low-pressure vibration test device according to claim 8, characterized in that: The vacuum solenoid valve (3) and the gas source solenoid valve (8) are both proportional communication solenoid valves.

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