An adjustable dynamic disturbance force measurement platform for special installation of vibration source and its measurement method

Abstract

The present invention provides an adjustable dynamic disturbance force measurement platform for special installation of vibration sources, including a base, a load platform and a force sensor. The platform is characterized in that slide rails are vertically installed at the four corners of the top of the base, slide platforms are installed on the inner sides of the slide rails, connectors 1 are installed on the slide platforms, force sensors are installed on the connectors 1, connectors 2 are installed on the force sensors, and connectors 2 are fixedly connected to the load platform by bolts. The dynamic force measurement platform described in the present invention can be installed with special vibration sources and can be installed through an adapter plate according to the size of the specially installed vibration source, so it has a wide range of adaptability. In addition, the load platform can be adjusted to a suitable position through the slide platform and the slide rails so that the system has a higher fundamental frequency, thereby achieving better measurement results.

Description

Technical Field

[0001] The invention relates to the technical field of dynamic disturbing force measurement, in particular to an adjustable dynamic disturbing force measurement platform for special installation of a vibration source. Background Art

[0002] Measuring the dynamic disturbance forces of large vibration sources in spacecraft on the ground is crucial for evaluating their impact on precision equipment within the spacecraft, optimizing the structures of key components, and optimizing the control of moving parts. Therefore, a ground-based dynamic disturbance force measurement device is needed.

[0003] The more common dynamic disturbance force measurement platforms, such as those disclosed in Chinese patents CN106289619A and CN115219092A, are generally designed with a load platform that is a single flat plate. The load platform and base are fixed and cannot be adjusted, let alone adjusted for specially installed vibration sources of different sizes, so as to achieve better measurement results. However, some vibration sources have special installation structures, such as a certain type of solar panel drive mechanism, a certain type of relay antenna, a certain type of camera shutter, etc., whose installation surface is not at the bottom of the vibration source but in the middle of the structure. Therefore, vibration sources that require special installation cannot be installed on the above-mentioned traditional dynamic disturbance force measurement platforms. In addition, the force measurement platform disclosed in Chinese CN101592518B, which can be installed with special vibration sources, cannot be adjusted for vibration sources of different sizes that require special installation, so as to achieve better measurement results. Summary of the Invention

[0004] The object of the present invention is to provide an adjustable dynamic disturbance force measurement platform for special installation of a vibration source, so as to solve the problems existing in the above-mentioned background technology.

[0005] The cam is mounted on a plurality of platforms, each of which is connected to a pair of movable members, each of which is connected to a pair of movable members, each of which is connected to a pair of movable members.

[0006] Furthermore, the force sensor is preferably a three-axis pressure sensor, and may also be a strain force sensor.

[0007] Furthermore, the upper portion of the slide rail is flush with the top of the slide rail, and reinforcing rods are respectively installed between adjacent slide rails, and the reinforcing rods are fixed to the slide rails by bolting.

[0008] Furthermore, threaded holes are provided at the four corners of the top of the base, and the threaded holes are used to bolt and fix the slide rail to the base. A countersunk hole is also provided on the top of the base, and the countersunk hole is used to install the measuring platform on the vibration isolation platform.

[0009] Furthermore, the connecting member 1 is in an I-shape, and a through hole 1 and a through hole 2 are respectively provided on the top and bottom of the connecting member 1. The through hole 1 is used to bolt the force sensor, and the through hole 2 is used to bolt the slide.

[0010] Furthermore, the second connector is L-shaped, and a third countersunk hole and a fourth countersunk hole are respectively provided at both ends of the second connector. The third countersunk hole is used to bolt the force sensor, and the fourth countersunk hole is used to bolt the load platform.

[0011] Furthermore, threaded holes three are symmetrically provided on both sides of the load platform, and the threaded holes three are bolted and fixed to the countersunk holes four of the connecting piece two.

[0012] Furthermore, the adapter plate can enable the measuring platform to match vibration sources of different radii. When the vibration source size is large, the mounting surface can match the second mounting threaded hole of the load platform, and there is no need to install the adapter plate. The large vibration source can be directly bolted through the first hole and the second threaded hole of the load platform; when the vibration source is small and the two cannot match, the small vibration source is bolted through the second hole and the fourth threaded hole of the adapter plate, and then bolted through the second countersunk hole of the adapter plate and the second threaded hole of the load platform to install the small vibration source on the load platform.

[0013] Furthermore, the slide is provided with a locking device.

[0014] Furthermore, the scale is provided with five large scale lines, and a number of small scale lines (not marked in the figure) are distributed between the large scale lines.

[0015] Furthermore, the measurement method of the adjustable dynamic force measurement platform includes calibration and measurement, which are respectively performed as follows:

[0016] (1) Calibration method:

[0017] a. Install the adjustable dynamic force measurement platform on the vibration isolation table;

[0018] b. Connect the output signal of the force sensor to the signal amplifier and data acquisition in sequence, and set the relevant acquisition parameters;

[0019] c. Slide the load platform and align it with the lowest scale mark on the scale. Lock the slide and dynamically calibrate the measurement system according to Chinese patent CN115165273A to obtain its dynamic calibration matrix D1(ω). Similarly, obtain the dynamic calibration matrices D2(ω), D3(ω), D4(ω), and D5(ω) of the measurement system when the load platform is aligned with the other four scale marks.

[0020] d. Save the dynamic calibration matrix;

[0021] (2) Measurement method:

[0022] e. Install the adjustable dynamic force measurement platform on the vibration isolation table and try to choose a quiet time and place for measurement;

[0023] f. Connect the output signal of the force sensor to the signal amplifier and data acquisition in sequence, and set the same relevant acquisition parameters as those used in dynamic calibration;

[0024] g. Install the vibration source on the load platform, adjust the load platform so that the bottom of the vibration source is as close to the base as possible, and lock the slide;

[0025] h. Determine the dynamic calibration matrix based on the current position of the load platform. If the load platform is aligned with a large scale line, select the corresponding dynamic calibration matrix saved in step d. If the load platform is aligned with a small scale line, first select the dynamic calibration matrix corresponding to the two large scale lines closest to the small scale line. Then, based on the relationship between this small scale line and the two large scale lines, perform a difference calculation for each frequency point to obtain the dynamic calibration matrix D0(ω) corresponding to the small scale line.

[0026] i. The vibration source starts working, collects the output signal, uses the corresponding calibration matrix to perform dynamic force decoupling, and completes the measurement.

[0027] The beneficial effects of the present invention are:

[0028] The dynamic force measurement platform described in the present invention can install special vibration sources and can be installed through an adapter plate according to the size of the special installed vibration source, and has a wide range of adaptability; in addition, the load platform can be adjusted to a suitable position through the slide and the slide rail so that the system has a higher fundamental frequency, thereby achieving better measurement results; there is no need to replace the sensors or other components in the measurement platform for vibration sources of different sizes, which shortens the design cycle, and there is no need to install additional large-volume adapter tooling, thereby avoiding the influence of the tooling fundamental frequency on the measurement accuracy; in addition, since the platform has been dynamically calibrated in sections for different load platform positions, during measurement, the corresponding dynamic calibration matrix can be selected according to the position of the load platform relative to the scale (or a new dynamic calibration matrix can be obtained by performing the difference) for decoupling, which also simplifies the calibration and measurement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of an adjustable dynamic disturbance force measurement platform for installing a small vibration source.

[0030] Figure 2 Schematic diagram of the structure of an adjustable dynamic disturbance force measurement platform with a large vibration source installed.

[0031] Figure 3 Schematic diagram of the structural explosion of an adjustable dynamic disturbance force measurement platform for installing a small vibration source.

[0032] Figure 4 Schematic diagram of the structure of the base of the measuring platform.

[0033] Figure 5 Schematic diagram of the structure of the load platform of the measurement platform.

[0034] Figure 6 Schematic diagram of the structure of the adapter plate of the measurement platform.

[0035] Figure 7 This is a structural diagram of the connecting part 1 of the measuring platform.

[0036] Figure 8 This is a structural diagram of the second connector of the measuring platform.

[0037] Figure 9 Calibration flow chart of the measurement platform.

[0038] Figure 10 Set up a flow chart for the measurement of the measurement platform.

[0039] In the figure, 01-base, 011-threaded hole one, 012-countersunk hole one, 02-load platform, 021-hole one, 022-threaded hole two, 023-threaded hole three, 03-adapter plate, 031-hole two, 032-threaded hole four, 033-countersunk hole two, 034-boss, 04-reinforcement rod, 05-slide rail, 06-slide table, 07-connector one, 071-through hole one, 072-through hole two, 08-force sensor, 09-connector two, 091-countersunk hole three, 092-countersunk hole four, 10-scale, 111-small vibration source, 112-large vibration source. Implementation Method

[0040] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] like Figure 1-8 As shown, an adjustable dynamic disturbance force measurement platform for special installation of a vibration source includes a base 01, a load platform 02 and a force sensor 08. Slide rails 05 are vertically installed at the four corners of the top of the base 01, and slide platforms 06 are installed on the inner sides of the slide rails 05. The slide platforms 06 can slide vertically up and down on the slide rails 05. Connectors 07 are installed on the slide platforms 06, and force sensors 08 are installed on the connectors 07. Connectors 09 are installed on the force sensors 08. Connectors 09 are fixed to the load platform 02 by bolts. A hole 021 is opened in the middle of the load platform 02, and threaded holes 022 are opened on the load platform 02 and on the edge of the hole 021. The threaded hole 022 is connected to the adapter plate 03 by bolts, and a hole 031 is provided in the middle of the adapter plate 03. A threaded hole 032 is provided on the adapter plate 03 and on the edge of the hole 031. A countersunk hole 033 is provided on the adapter plate 03 at a position corresponding to the threaded hole 022 of the load platform 02. A circle of positioning bosses 034 is provided at the bottom of the adapter plate 03, and the bosses are inserted into the hole 021 of the load platform 02. A scale 10 is pasted on one of the side surfaces of the slide rail 05.

[0042] The force sensor 08 is preferably a three-axis pressure sensor, and may also be a strain gauge force sensor.

[0043] The upper portion of the slide rail 05 is flush with the top of the slide rail 05 , and reinforcing rods 04 are respectively installed between adjacent slide rails 05 , and the reinforcing rods 04 and the slide rail 05 are fixed by bolting.

[0044] The four corners of the top of the base 01 are provided with threaded holes 011, and the threaded holes 011 are used to bolt the slide rail 05 to the base 01. The top of the base 01 is also provided with a countersunk hole 012, and the countersunk hole 012 is used to install the measuring platform on the vibration isolation platform.

[0045] The connecting member 07 is in an I-shape, and a through hole 071 and a through hole 072 are respectively provided on the top and bottom of the connecting member 07. The through hole 071 is used to bolt the force sensor 08, and the through hole 072 is used to bolt the slide 06.

[0046] The second connecting member 09 is L-shaped, and the two ends of the second connecting member 07 are respectively provided with a third countersunk hole 091 and a fourth countersunk hole 092. The third countersunk hole 091 is used to bolt the force sensor 08, and the fourth countersunk hole 092 is used to bolt the load platform 02.

[0047] The two sides of the load platform 02 are symmetrically provided with threaded holes 023, and the threaded holes 023 are bolted and fixed to the countersunk holes 092 of the second connecting piece 09.

[0048] The adapter plate 03 enables the measuring platform to match vibration sources of different radii. When the vibration source size is a large vibration source 112, the mounting surface can match the mounting threaded hole 2 022 of the load platform 02. There is no need to install the adapter plate 03. The large vibration source 112 can be directly passed through the hole 1 021 and bolted to the threaded hole 2 022 of the load platform 02; when the vibration source is a small vibration source 111 and the two cannot match, the small vibration source 111 is passed through the hole 2 031 and bolted to the threaded hole 4 032 of the adapter plate 03, and then bolted to the threaded hole 2 022 of the load platform 02 through the countersunk hole 2 033 of the adapter plate 03 to install the small vibration source 111 on the load platform 02.

[0049] The slide 06 is provided with a locking device.

[0050] The scale 10 is provided with five large scale lines, and a number of small scale lines (not shown in the figure) are distributed between the large scale lines.

[0051] like Figure 9-10 As shown, in order to take into account the influence of the fundamental frequency of the measurement system on the measurement accuracy, the dynamic calibration is based on frequency domain data. The measurement method of the adjustable dynamic force measurement platform includes calibration and measurement, which are performed as follows:

[0052] (1) Calibration method:

[0053] a. Install the adjustable dynamic force measurement platform on the vibration isolation table;

[0054] b. Connect the output signal of force sensor 08 to the signal amplifier and data acquisition in sequence, and set the relevant acquisition parameters;

[0055] c. Slide the load platform 02 and align it with the lowest scale mark on the scale. Lock the slide and refer to Chinese patent CN115165273A to dynamically calibrate the measurement system to obtain its dynamic calibration matrix D1(ω). Similarly, obtain the dynamic calibration matrices D2(ω), D3(ω), D4(ω), and D5(ω) of the measurement system when the load platform 02 is aligned with the other four scale marks.

[0056] d. Save the dynamic calibration matrix;

[0057] (2) Measurement method:

[0058] e. Install the adjustable dynamic force measurement platform on the vibration isolation table and try to choose a quiet time and place for measurement;

[0059] f. The output signal of the force sensor 08 is sequentially connected to the signal amplifier and the data acquisition, and the relevant acquisition parameters are set to be the same as those during dynamic calibration;

[0060] g. Install the vibration source on the load platform 02, adjust the load platform 02 so that the bottom of the vibration source is as close to the base 01 as possible, and lock the slide 06;

[0061] h. Determine the dynamic calibration matrix based on the current position of the load platform 02. If the load platform 02 is aligned with a large scale line on the scale 10, select the corresponding dynamic calibration matrix saved in step d. If the load platform is aligned with a small scale line on the scale 10, first select the dynamic calibration matrix corresponding to the two large scale lines closest to the small scale line. Then, based on the relationship between this small scale line and the two large scale lines, perform a difference calculation for each frequency point to obtain the dynamic calibration matrix D0(ω) corresponding to the small scale line.

[0062] i. The vibration source starts working, collects the output signal, uses the corresponding calibration matrix to perform dynamic force decoupling, and completes the measurement.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adjustable dynamic disturbance force measurement platform for special installation of vibration source, comprising a base, a load platform and a force sensor, characterized in that: The four corners of the top of the base are respectively vertically mounted with slide rails, and slide platforms are respectively mounted on the inner sides of the slide rails, and the slide platform can slide vertically up and down on the slide rails. The slide platform is respectively mounted with connecting parts one, and force sensors are respectively mounted on the connecting parts one, and connecting parts two are respectively mounted on the force sensors. The connecting parts two are fixedly connected to the load platform by bolts. The load platform is provided with a hole one in the middle, and a threaded hole two is provided on the load platform and the edge of the hole one, and the threaded hole two is connected to an adapter plate by bolts. The adapter plate is provided with a hole two in the middle, and a threaded hole four is provided on the upper and lower edges of the hole two of the adapter plate, and a countersunk hole two is provided on the adapter plate at a position corresponding to the threaded hole two of the load platform. The bottom of the adapter plate is provided with a circle of positioning bosses, and the bosses are stuck in the holes one of the load platform, and a scale is pasted on one side of the slide rail; The measurement method of the adjustable dynamic disturbance force measurement platform, including calibration and measurement, is carried out as follows: (1) Calibration method: a. Install the adjustable dynamic force measurement platform on the vibration isolation table; b. Connect the output signal of the force sensor to the signal amplifier and data acquisition in sequence, and set the relevant acquisition parameters; c. Slide the load platform and align it with the lowest scale mark on the scale. Lock the slide and dynamically calibrate the measurement system to obtain its dynamic calibration matrix D1(ω). Similarly, obtain the dynamic calibration matrices D2(ω), D3(ω), D4(ω), and D5(ω) of the measurement system when the load platform is aligned with the other four scale marks. d. Save the dynamic calibration matrix; (2) Measurement method: e. Install the adjustable dynamic force measurement platform on the vibration isolation table and try to choose a quiet time and place for measurement; f. Connect the output signal of the force sensor to the signal amplifier and data acquisition in sequence, and set the same relevant acquisition parameters as those used in dynamic calibration; g. Install the vibration source on the load platform, adjust the load platform so that the bottom of the vibration source is as close to the base as possible, and lock the slide; h. Determine the dynamic calibration matrix based on the current position of the load platform. If the load platform is aligned with a large scale line, select the corresponding dynamic calibration matrix saved in step d. If the load platform is aligned with a small scale line, first select the dynamic calibration matrix corresponding to the two large scale lines closest to the small scale line. Then, based on the relationship between this small scale line and the two large scale lines, perform a difference calculation for each frequency point to obtain the dynamic calibration matrix D0(ω) corresponding to the small scale line. i. The vibration source starts working, collects the output signal, uses the corresponding calibration matrix to perform dynamic force decoupling, and completes the measurement.

2. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The force sensor is preferably a three-axis pressure sensor, and may also be a strain gauge force sensor.

3. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The upper portion of the slide rail is flush with the top of the slide rail, and reinforcing rods are respectively installed between adjacent slide rails. The reinforcing rods are fixed to the slide rails by bolting.

4. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The four corners of the top of the base are provided with threaded holes, which are used to bolt the slide rail to the base. The top of the base is also provided with a countersunk hole, which is used to install the measuring platform on the vibration isolation platform.

5. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The connecting member 1 is in an I-shape, and a through hole 1 and a through hole 2 are respectively provided on the top and bottom of the connecting member 1. The through hole 1 is used for bolting the force sensor, and the through hole 2 is used for bolting the slide.

6. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The second connector is L-shaped, and a third countersunk hole and a fourth countersunk hole are respectively provided at both ends of the second connector. The third countersunk hole is used for bolting the force sensor, and the fourth countersunk hole is used for bolting the load platform.

7. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The two sides of the load platform are symmetrically provided with threaded holes three, and the threaded holes three are bolted and fixed to the countersunk holes four of the connecting piece two.

8. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The adapter plate enables the measuring platform to match vibration sources of different radii. When the vibration source is large, the mounting surface can match the second mounting threaded hole of the load platform, and there is no need to install the adapter plate. The large vibration source can be directly bolted through the first hole and the second threaded hole of the load platform. When the vibration source is small and the two cannot match, the small vibration source is bolted through the second hole and the fourth threaded hole of the adapter plate, and then bolted through the second countersunk hole of the adapter plate and the second threaded hole of the load platform to install the small vibration source on the load platform.

9. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The slide is provided with a locking device.

10. The adjustable dynamic disturbance force measurement platform for special installation of vibration source according to claim 1, characterized in that: The scale is provided with five large scale lines, and a plurality of small scale lines are distributed between the large scale lines.

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