Large-scale high-rigidity dynamometer system

Abstract

The invention relates to a large-scale high-rigidity dynamometer system, and belongs to the field of vibration measurement. Comprising an inner platform assembly, a force measuring ring assembly, an outer platform assembly and six-component force analysis software. The outer platform assembly is of a horizontally-placed square cylinder structure. A groove is formed in the top of the outer platform assembly; the inner platform assembly is embedded into the groove downwards from the top to achieve butt joint with the outer platform assembly. Force measuring ring assemblies are evenly arranged on the lower surface of the inner platform assembly in the circumferential direction. A cable of each force measuring ring assembly is led out from the side wall of the outer platform assembly and is connected with the six-component force analysis software; according to the invention, the six-component disturbance vibration force / torque generated by a large-scale disturbance vibration source can be accurately measured and displayed in real time, the method is used for analyzing the dynamic characteristics of the disturbance vibration source in six degrees of freedom in the space in the operation process of a spacecraft, and reference is provided for disturbance source suppression.

Description

Technical Field

[0001] This invention belongs to the field of vibration measurement and relates to a large-scale, high-stiffness force table system. Background Technology

[0002] As spacecraft require increasingly higher pointing accuracy and stability, it is necessary to more accurately measure the vibration characteristics of onboard moving parts (such as control moment gyroscopes, solar array drive mechanisms, and refrigerators). During ground testing, it is necessary to accurately measure the vibration force and vibration torque of the moving parts on the spacecraft.

[0003] Existing force measurement platforms can measure omnidirectional disturbance forces and moments within the 0-500Hz frequency band. However, since some structural frequencies of the force measurement platform also lie within this frequency band, these frequencies amplify the actual disturbance forces and moments of the measured object. To obtain the true disturbance characteristics, secondary calibration of the measurements is usually required to obtain data reflecting the structural characteristics of the force measurement platform, such as the transfer function, which is then used to correct the test data.

[0004] As the weight of moving parts increases, the frequency of the force measuring table structure decreases more significantly, and the structural frequencies within the 0-500Hz frequency band become more concentrated. If the measurement results are still corrected based on the transfer function, on the one hand, the verification work is time-consuming and inefficient, and it is impossible to obtain the real disturbance force in real time. On the other hand, the process of obtaining the transfer function will be affected by the error of the excitation system itself, affecting the accuracy of the correction results. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a large-scale, high-stiffness force measurement stage system that can accurately measure and display in real time the six-component disturbance force / torque generated by a large-scale disturbance source. This system can be used to analyze the dynamic characteristics of the disturbance source in the six degrees of freedom in space during spacecraft operation and provide a reference for disturbance source suppression.

[0006] The solution of the present invention is:

[0007] A large-scale, high-stiffness force measuring table system includes an inner platform assembly, a force measuring ring assembly, an outer platform assembly, and six-component force analysis software;

[0008] The outer platform component is a horizontally placed square column structure; a groove is provided on the top of the outer platform component; the inner platform component is embedded into the groove from the top downwards to achieve docking with the outer platform component; force measuring ring components are evenly arranged circumferentially on the lower surface of the inner platform component; the cables of each force measuring ring component are led out from the side wall of the outer platform component and connected to the six-component force analysis software; the six-component force analysis software enables real-time display of the measured six-component forces or torques.

[0009] In the aforementioned large-scale, high-rigidity force measuring table system, the upper surface of the inner platform component is a square structure; the lower surface of the inner platform component is a four-sided oblique cone structure; the groove shape on the top of the outer platform component corresponds to the inner platform component, thereby achieving a tapered fit between the inner platform component and the outer platform component.

[0010] In the aforementioned large-scale, high-rigidity force table system, the single-sided taper of the lower surface of the inner platform component is set to θ, where 20°≤θ≤70°. Through the taper fit, the assembly stability and lateral load capacity of the inner platform component and the outer platform component are improved.

[0011] In the aforementioned large-scale high-rigidity force measuring table system, two circular countersunk holes are provided vertically at the joint of any two adjacent inclined surfaces on the lower surface of the inner platform component; each circular countersunk hole corresponds to the installation of one force measuring ring component; the inner wall of the circular countersunk hole is provided with threads, and the inner platform component and the outer platform component are fixed by locking screws.

[0012] In the aforementioned large-scale, high-rigidity force measuring platform system, a through hole is provided at the axis of the force measuring ring assembly, and a corresponding locking screw passes through the through hole of the force measuring ring assembly to press the force measuring ring assembly.

[0013] In the aforementioned large-scale high-rigidity force measuring table system, the outer platform assembly includes four L-shaped outer platforms, four side connecting blocks, four bottom connecting blocks, and a circular cover plate.

[0014] The four L-shaped outer platforms are connected sequentially along the circumference to form the main frame structure of the outer platform assembly; a side connecting block is set at the side wall of the joint between two adjacent L-shaped outer platforms; a bottom connecting block is set at the bottom of the joint between two adjacent L-shaped outer platforms to fix the four L-shaped outer platforms; a circular cover plate is horizontally installed at the bottom of the four L-shaped outer platforms to seal the bottom through hole.

[0015] In the aforementioned large-scale, high-rigidity force measuring platform system, the inner wall of each L-shaped outer platform is an inclined structure. After the four L-shaped outer platforms are circumferentially connected, they form a groove structure of four inclined cones around the outer platform assembly.

[0016] In the aforementioned large-scale, high-rigidity force measuring platform system, a socket mounting hole is provided at the bottom of the outer wall of one L-shaped outer platform corner; a socket is installed in the socket mounting hole to realize the insertion of external cable plugs.

[0017] In the aforementioned large-scale, high-rigidity force measuring platform system, during measurement, the external object to be measured is mounted on the horizontal surface on top of the inner platform assembly; the inner platform assembly and the outer platform assembly are connected by a force measuring ring assembly and a preload is applied; the outer platform assembly is fixed to the ground.

[0018] In the aforementioned large-scale, high-stiffness force stage system, each force ring component is connected to a six-component force analysis software via three signal channels, providing the force measured by each force ring component; the redundant signal channels ensure the reliability of signal acquisition.

[0019] The advantages of this invention compared to the prior art are:

[0020] (1) The present invention has high structural stiffness and strong load-bearing capacity, and can accurately measure the vibration characteristics of the test object in a wider frequency band. It has a wide range of applications and can measure large-scale test objects.

[0021] (2) The present invention adopts a high redundancy design. The high redundancy of the signal channels can reduce calibration error, improve measurement accuracy, and improve system reliability.

[0022] (3) The present invention develops a six-component force analysis software for real-time display of six-component force / torque, which greatly improves the convenience of measurement and can be used for closed-loop feedback of active control. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall large-scale, high-rigidity force measuring table system of the present invention;

[0024] Figure 2 This is an exploded view of the large-scale, high-rigidity force measuring table system of the present invention;

[0025] Figure 3 This is a schematic diagram of the platform components within the present invention;

[0026] Figure 4 This is a schematic diagram of the external platform components of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments.

[0028] This invention provides a large-scale, high-stiffness force measurement stage system that can accurately measure and display in real time the six-component disturbance force / torque generated by a large-scale disturbance source. This system is used to analyze the dynamic characteristics of the disturbance source in six degrees of freedom in space during spacecraft operation, providing a reference for disturbance source suppression.

[0029] Large-scale, high-stiffness force table systems, such as Figure 1 , Figure 2As shown, the system specifically includes an inner platform assembly 1, a force-measuring ring assembly 2, an outer platform assembly 3, and a six-component force analysis software 4. The outer platform assembly 3 is a horizontally placed square column structure; a groove is provided at the top of the outer platform assembly 3; the inner platform assembly 1 is inserted into the groove from the top downwards, achieving docking with the outer platform assembly 3; force-measuring ring assemblies 2 are evenly arranged circumferentially on the lower surface of the inner platform assembly 1; cables from each force-measuring ring assembly 2 are led out from the side wall of the outer platform assembly 3 and connected to the six-component force analysis software 4; the six-component force analysis software 4 enables real-time display of the measured six-component forces or torques.

[0030] like Figure 3 As shown, the upper surface of the inner platform component 1 is a square structure; the lower surface of the inner platform component 1 is a four-sided oblique cone structure; the groove shape on the top of the outer platform component 3 corresponds to the inner platform component 1 and the outer platform component 3, realizing the tapered fit between the inner platform component 1 and the outer platform component 3.

[0031] The single-sided taper of the lower surface of the inner platform component 1 is set to θ, where 20°≤θ≤70°. Through the taper fit, the assembly stability and lateral load capacity of the inner platform component 1 and the outer platform component 3 are improved.

[0032] Two circular countersunk holes are vertically arranged at the joint of any two adjacent inclined surfaces on the lower surface of the inner platform assembly 1; each circular countersunk hole corresponds to the installation of one force-measuring ring assembly 2; the inner wall of the circular countersunk hole is threaded, and the inner platform assembly 1 is fixed to the outer platform assembly 3 by means of a locking screw. A through hole is provided at the axis of the force-measuring ring assembly 2, and the corresponding locking screw passes through the through hole of the force-measuring ring assembly 2 to press the force-measuring ring assembly 2.

[0033] In this invention, each force ring assembly 2 is connected to the six-component force analysis software 4 through three signal channels, providing the force measured by each force ring assembly 2; the redundant signal channels ensure the reliability of signal acquisition.

[0034] like Figure 4 As shown, the outer platform assembly 3 includes four L-shaped outer platforms 301, four side connecting blocks 303, four bottom connecting blocks 307, and a circular cover plate 308. The four L-shaped outer platforms 301 are sequentially joined together circumferentially to form the main frame structure of the outer platform assembly 3. A side connecting block 303 is provided at the side wall of the joint between two adjacent L-shaped outer platforms 301. A bottom connecting block 307 is provided at the bottom of the joint between two adjacent L-shaped outer platforms 301, thus fixing the four L-shaped outer platforms 301. The circular cover plate 308 is horizontally installed at the bottom of the four L-shaped outer platforms 301 to seal the bottom through holes.

[0035] The inner wall of each L-shaped outer platform 301 is a sloping structure, so that after the four L-shaped outer platforms 301 are connected circumferentially, they form a groove structure of four oblique cones of the outer platform assembly 3. A socket mounting hole is opened at the bottom of the outer wall at the corner of one of the L-shaped outer platforms 301; a socket is installed in the socket mounting hole to realize the insertion of external cable plugs.

[0036] During measurement, the external object to be measured is mounted on the horizontal surface at the top of the inner platform assembly 1; the inner platform assembly 1 and the outer platform assembly 3 are connected by the force measuring ring assembly 2 and a preload is applied; the outer platform assembly 3 is fixed to the ground.

[0037] The six-component force analysis software of the force measuring table system uses the calibration matrix obtained through calibration to load into the six-component force analysis software for real-time measurement, making the measurement more convenient.

[0038] The present invention has high structural rigidity and strong load-bearing capacity, and can accurately measure the vibration characteristics of the test object in a wider frequency band. It has a wide range of applications and can measure large-scale test objects.

[0039] Meanwhile, the high redundancy design reduces calibration errors, improves measurement accuracy, and enhances system reliability.

[0040] This invention develops a six-component force analysis software for real-time display of six-component forces / torques, which greatly improves the convenience of measurement and can be used for closed-loop feedback in active control.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A large-scale, high-stiffness force measuring stage system, characterized in that: It includes an inner platform component (1), a force measuring ring component (2), an outer platform component (3), and a six-component force analysis software (4); Among them, the outer platform component (3) is a horizontally placed square column structure; the top of the outer platform component (3) is provided with a groove; the inner platform component (1) is embedded into the groove from the top downward to achieve docking with the outer platform component (3); the lower surface of the inner platform component (1) is uniformly arranged with force measuring ring components (2) along the circumference; the cables of each force measuring ring component (2) are led out from the side wall of the outer platform component (3) and connected to the six-component force analysis software (4); the six-component force analysis software (4) is used to realize the real-time display of the measured six-component force or torque.

2. The large-scale, high-stiffness force measuring table system according to claim 1, characterized in that: The upper surface of the inner platform component (1) is a square structure; the lower surface of the inner platform component (1) is a four-sided oblique cone structure; the groove shape on the top of the outer platform component (3) corresponds to the inner platform component (1) and the outer platform component (3) to achieve a tapered fit.

3. The large-scale, high-stiffness force measuring stage system according to claim 2, characterized in that: Set the single-sided taper of the lower surface of the inner platform component (1) to θ, 20°≤θ≤70°; through the taper fit, improve the assembly stability and lateral load capacity of the inner platform component (1) and the outer platform component (3).

4. The large-scale, high-stiffness force measuring stage system according to claim 2, characterized in that: Two circular countersunk holes are provided vertically at the joint of any two adjacent inclined surfaces on the lower surface of the inner platform assembly (1); each circular countersunk hole corresponds to the installation of a force measuring ring assembly (2); the inner wall of the circular countersunk hole is provided with threads, and the inner platform assembly (1) and the outer platform assembly (3) are fixed by locking screws.

5. The large-scale, high-stiffness force measuring stage system according to claim 4, characterized in that: The force measuring ring assembly (2) has a through hole at its axis, and the corresponding locking screw passes through the through hole of the force measuring ring assembly (2) to press the force measuring ring assembly (2).

6. The large-scale, high-stiffness force measuring stage system according to claim 2, characterized in that: The outer platform assembly (3) includes four L-shaped outer platforms (301), four side connecting blocks (303), four bottom connecting blocks (307), and a circular cover plate (308); Among them, four L-shaped outer platforms (301) are connected in sequence along the circumference to form the main frame structure of the outer platform assembly (3); a side connecting block (303) is set at the side wall of the joint of two adjacent L-shaped outer platforms (301); a bottom connecting block (307) is set at the bottom of the joint of two adjacent L-shaped outer platforms (301) to fix the four L-shaped outer platforms (301); a circular cover plate (308) is horizontally installed at the bottom of the four L-shaped outer platforms (301) to seal the bottom through hole.

7. A large-scale, high-stiffness force measuring table system according to claim 6, characterized in that: The inner wall of each L-shaped outer platform (301) is a sloping structure, so that after the four L-shaped outer platforms (301) are connected in the circumferential direction, they form a groove structure of four sloping cones of the outer platform assembly (3).

8. A large-scale, high-stiffness force measuring stage system according to claim 6, characterized in that: One of the L-shaped outer platforms (301) has a socket mounting hole at the bottom of the outer wall at the corner; a socket is installed in the socket mounting hole to realize the insertion of the external cable plug.

9. A large-scale, high-stiffness force measuring stage system according to claim 6, characterized in that: During measurement, the external object to be measured is mounted on the horizontal surface on top of the inner platform assembly (1); the inner platform assembly (1) and the outer platform assembly (3) are connected by a force measuring ring assembly (2) and a preload is applied; the outer platform assembly (3) is fixed to the ground.

10. A large-scale, high-stiffness force measuring stage system according to claim 1, characterized in that: Each force ring assembly (2) is connected to the six-component force analysis software (4) through three signal channels, providing the force measured by each force ring assembly (2); the redundant signal channels ensure the reliability of signal acquisition.

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