Unlocking impulse measuring method with flexible connecting device

Abstract

An unlocking impulse measuring method with a flexible connection device comprises the steps that a rigid support and a load adaptation structure are connected and disconnected, and a flexible connection link posture adjusting device is additionally arranged between a transition support at the top of a flexible connection link and the flexible connection link; the effective load is connected with the load adaptive structure through the transition bracket, the flexible connection link attitude adjusting device and the flexible connection link; a rigid support limiting device is installed between the rigid support and the load adaptive structure, and the height of the rigid support limiting device is adjusted so that the upper surface of the rigid support limiting device can just make contact with the bottom face of the rigid support without extrusion; the rigid support is controlled to detonate through ground equipment; in the test process, displacement of a flexible connection link is monitored, an impact response measurement system is used for measuring an effective load and impact response on the flexible connection link, the speed of the rigid support is measured through two measurement means of high-speed camera shooting and laser vibration measurement, and the initial speed and the effective load mass measured in the test are calculated as the initial speed. The impulse generated at the detonation moment of the rigid support is obtained.

Description

Technical Field

[0001] This invention relates to a method for measuring unlocking impulse with a flexible connection device, belonging to the field of impact dynamics technology. Background Technology

[0002] With the improvement of remote sensing satellite functional indicators, optical payloads are particularly sensitive to the micro-vibrations of the satellite platform and itself. To achieve "dynamic and static isolation" between the satellite platform and the optical payload, a flexible connection device is used for connection. Due to the low stiffness of the flexible connection device, during the satellite's active launch phase, a rigid support needs to be installed in parallel with the flexible connection device to withstand the mechanical loads of the active phase. After the satellite enters orbit, the rigid support is unlocked, thus achieving dynamic and static separation between the satellite platform and the optical payload, providing a "quiet" working environment for the optical payload.

[0003] During the satellite design phase, in order to verify the reliability of the rigid support unlocking and the impact of the impulse generated during the unlocking process on the flexible connection device, a rigid support unlocking test needs to be conducted after the satellite's overall mechanical test. During the rigid support unlocking process, because the flexible connection device has low stiffness and cannot directly withstand the gravitational force of the optical load, an unlocking impulse method needs to be designed to protect the flexible connection device, and the unlocking impulse needs to be measured. Summary of the Invention

[0004] The technical problem to be solved by this invention is to design an unlocking impulse measurement method for satellites using flexible connection devices, so as to ensure the accuracy of the impact measurement while protecting the flexible connection device from damage caused by the load gravity during the unlocking process of the rigid support.

[0005] The objective of this invention is achieved through the following technical solutions: A method for measuring unlocking impulse with a flexible connection device includes: The connection between the rigid support and the load-adaptive structure is disconnected, and a flexible connection adjustment device is installed between the transition bracket at the top of the flexible connection link and the flexible connection link. The payload is connected to the load-adapting structure through a transition bracket, a flexible connection link, an attitude adjustment device, and a flexible connection link. A rigid support limiting device is installed between the rigid support and the load-adapting structure. The height of the rigid support limiting device is adjusted so that its upper surface just contacts the bottom surface of the rigid support without squeezing, thus ensuring buffering and limiting protection for the unlocked rigid support. The rigid support was detonated by ground equipment; the displacement of the flexible connection was monitored during the test; the impact response measurement system was used to measure the effective load and the impact response on the flexible connection; the velocity of the rigid support was measured by high-speed camera and laser vibration measurement; and the impulse generated at the moment of detonation of the rigid support was obtained based on the velocity and effective load mass measured in the test.

[0006] Preferably, the attitude adjustment device of the flexible connection link is adjusted so that the effective load is aligned with the top interface of the flexible connection link, so as to avoid generating additional torque on the flexible connection link.

[0007] Preferably, an unlocking impulse test fixture system is used, which includes: Load unloading device: counteracts the effective load gravity and provides approximately free boundary conditions; Flexible connection link attitude adjustment device: When there is an irreparable positional deviation between the payload and the load-adaptive structure during docking, it can achieve docking between the payload and the flexible connection link by adjusting its own local position while keeping the flexible connection link in a zero position. Ground support fixtures: a combination of support load, flexible connection links, and load-adaptive structures; Rigid load support: When the effective load is removed after the test, a rigid load support is used to fix the effective load. Rigid support limiting device: provides buffering and limiting protection for the unlocked rigid support.

[0008] Compared with the prior art, the present invention has the following advantages: (1) The present invention uses a load gravity unloading device to unload the effective load by gravity, providing the effective load with an approximately free boundary state, and effectively obtaining the unlocking impulse of the rigid support in the free state of the effective load.

[0009] (2) The present invention uses a limiting protection device to limit the flexible connection link to prevent the rigid support from stretching or compressing the flexible connection link at the moment of unlocking, and effectively protects the flexible connection link from structural damage during the unlocking process.

[0010] (3) The present invention uses two measurement methods: high-speed camera and laser vibration measurement. It has high measurement accuracy and flexible operation, and can accurately measure the impulse generated by the rigid support at the moment of unlocking. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the impulse measurement status; Figure 2 This is a schematic diagram of the impulse measurement process.

[0012] Reference numerals: 1-Load unloading device; 2-Effective load; 3-Rigid support; 4-Rigid support limiting device; 5-Load adaptation structure; 6-Ground support fixture; 7-Transition bracket; 8-Flexible connection adjustment device; 9-Flexible connection. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0014] The unlocking impulse test fixture system includes: 1) Load unloading device 1: counteracts the gravity of effective load 2 and provides approximately free boundary conditions.

[0015] 2) Flexible connection link attitude adjustment device 8: When there is an irreparable positional deviation between the effective load 2 and the load matching structure 5, it can achieve docking between the effective load 2 and the flexible connection link 9 by adjusting itself locally, while keeping the flexible connection link 9 in a zero position.

[0016] 3) Ground support fixture 6: a combination of support effective load 2, flexible connection link 9, and load adaptation structure 5.

[0017] 4) Rigid load support: When the effective load 2 is removed after the test is completed, the effective load is fixed by a rigid load support.

[0018] 5) Rigid support limiting device 4: Provides buffering and limiting protection for the unlocked rigid support 3.

[0019] Figure 1 This is a schematic diagram of the unlocking impulse test system. The payload 2 and the load adapter structure 5 are connected via a flexible connection link 9. A flexible connection link adjustment device 8 is installed on the flexible connection link 9, and the flexible connection link adjustment device 8 achieves interface matching with the payload 2 through a transition bracket 7. A rigid support 3 is installed in parallel with the flexible connection link 9. The top of the rigid support 3 is connected to the payload 2, and the bottom is connected to the load adapter structure 5 through a rigid support limiting device 4, achieving buffering and limiting protection for the rigid support 3 after unlocking.

[0020] A method for measuring unlocking impulse with a flexible connection device includes: The connection between the rigid support 3 and the load-adapting structure 5 is disconnected, and a flexible connection adjustment device 8 is installed between the top transition bracket 7 of the flexible connection link 9 and the flexible connection link 9. The flexible connection adjustment device 8 is adjusted to align the effective load 2 with the top interface of the flexible connection link 9, so as to avoid generating additional torque on the flexible connection link 9.

[0021] The payload 2 is connected to the load adapter structure 5 via the transition bracket 7, the flexible connection adjustment device 8, and the flexible connection 9. A rigid support limiting device 4 is installed between the rigid support 3 and the load adapter structure 5. The height of the rigid support limiting device 4 is adjusted so that its upper surface just contacts the bottom surface of the rigid support 3 without squeezing, thus ensuring buffering and limiting protection for the unlocked rigid support 3.

[0022] The rigid support 3 was detonated simultaneously by ground equipment. During the test, the displacement of the flexible connection link 9 was monitored, and the impact response on the effective load 2 and the flexible connection link 9 was measured by an impact response measurement system. The velocity of the rigid support 3 was measured by two measurement methods: high-speed imaging and laser vibration measurement. Based on the velocity and effective load mass measured in the test, the impulse generated at the moment of detonation of the rigid support was obtained.

[0023] Figure 2 This is a schematic diagram of an embodiment of the unlocking impulse measurement method. The payload is connected to the load-adapting structure via a flexible connection link, and the rigid support is installed in parallel with the flexible connection link. The measurement process for the unlocking impulse of the rigid support of the payload is as follows: 1) Lowering the payload assembly: Use a payload lifting device to lift and lower the payload-flexible connection link-load adaptation structure assembly into the satellite. 2) Installation of the assembly onto the ground support fixture: The assembly is transferred to the unlocking impulse test area, the ground support fixture is adjusted to align with the interface of the assembly, the assembly is placed on the ground support fixture, and the ground support fixture and load adapter structure are connected. 3) Disconnect the transition support from the flexible connection link; 4) The effective load is lifted by the effective load gravity unloading device to a distance of 250mm from the top of the flexible connection link at the lower end of the transition support; 5) Install a flexible connection link attitude adjustment device: Install a flexible connection link attitude adjustment device under the transition support; 6) Payload leveling; 7) Install a rigid support limiting device below the rigid support; 8) Install high-speed camera and laser vibration target: attach high-speed camera and laser vibration target to the rigid support and flexible connection; 9) Connect the flexible connection link attitude adjustment device to the flexible connection link: The position of the effective load is adjusted by the effective load gravity unloading device and the flexible connection link attitude adjustment device. The flexible connection link attitude adjustment device is aligned with the top hole of the flexible connection link and connected. During this process, the height of the rigid support limit device is adjusted to protect the flexible connection link. 10) Adjustment of rigid support limiting device and confirmation of effective load status: Adjust the height of the rigid support limiting device so that its upper surface just contacts the bottom surface of the effective load rigid support but without compression; 11) Measurement system preparation and status verification: Arrangement, debugging, and status verification of high-speed camera system and laser vibration measurement system; 12) Confirm the status of the flexible connection link, and set and confirm the unlock status; 13) Electric detonation unlocking and impulse measurement of rigid support: From the time of detonation to the end of the test, a high-speed camera measures the velocity of the rigid support and the flexible connection; a laser vibration meter measures the velocity of the rigid support. 14) Check the unlocking status of rigid supports and the status of flexible connections; 15) Rigid support removal: Disconnect the rigid support limiting device from the lower flange and load-adaptive structure of the rigid support, and move the rigid support limiting device horizontally out.

[0024] The contents not described in detail in this specification are common knowledge to those skilled in the art.

[0025] 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 method for measuring unlocking impulse including a flexible connecting device, characterized in that, include: The connection between the rigid support and the load-adaptive structure is disconnected, and a flexible connection adjustment device is installed between the transition bracket at the top of the flexible connection link and the flexible connection link. The payload is connected to the load-adapting structure through a transition bracket, a flexible connection link, an attitude adjustment device, and a flexible connection link. A rigid support limiting device is installed between the rigid support and the load-adapting structure. The height of the rigid support limiting device is adjusted so that its upper surface just contacts the bottom surface of the rigid support without squeezing, thus ensuring buffering and limiting protection for the unlocked rigid support. The rigid support was detonated by ground equipment; the displacement of the flexible connection was monitored during the test; the impact response measurement system was used to measure the effective load and the impact response on the flexible connection; the velocity of the rigid support was measured by high-speed camera and laser vibration measurement; and the impulse generated at the moment of detonation of the rigid support was obtained based on the velocity and effective load mass measured in the test.

2. The unlocking impulse measurement method according to claim 1, characterized in that, Adjust the attitude adjustment device of the flexible connection link to align the effective load with the top interface of the flexible connection link, so as to avoid generating additional torque on the flexible connection link.

3. The unlocking impulse measurement method according to claim 1, characterized in that, An unlocking impulse test fixture system is adopted, which includes: Load unloading device: counteracts the effective load gravity and provides approximately free boundary conditions; Flexible connection link attitude adjustment device: When there is an irreparable positional deviation between the payload and the load-adaptive structure during docking, it can achieve docking between the payload and the flexible connection link by adjusting its own local position while keeping the flexible connection link in a zero position. Ground support fixtures: a combination of support load, flexible connection links, and load-adaptive structures; Rigid load support: When the effective load is removed after the test, a rigid load support is used to fix the effective load. Rigid support limiting device: provides buffering and limiting protection for the unlocked rigid support.

4. A method for measuring the unlocking impulse containing a flexible connecting device, characterized in that, include: 1) Lowering the payload assembly: Use a payload lifting device to lift and lower the payload-flexible connection link-load adaptation structure assembly into the satellite. 2) Install the assembly onto the ground support fixture; 3) Disconnect the transition support from the flexible connection link; 4) The effective load is lifted by the effective load gravity unloading device to the distance between the lower end face of the transition support and the top of the flexible connection link; 5) Install a flexible connection link attitude adjustment device: Install a flexible connection link attitude adjustment device under the transition support; 6) Payload leveling; 7) Install a rigid support limiting device below the rigid support; 8) Install high-speed camera and laser vibration target: attach high-speed camera and laser vibration target to the rigid support and flexible connection; 9) Connect the attitude adjustment device to the flexible connection link; 10) Adjustment of rigid support limiting device and confirmation of effective load status: Adjust the height of the rigid support limiting device so that its upper surface just contacts the bottom surface of the effective load rigid support but without compression; 11) Measurement system preparation and status verification: Arrangement, debugging, and status verification of high-speed camera system and laser vibration measurement system; 12) Confirm the status of the flexible connection link, and set and confirm the unlock status; 13) Electrically detonated unlocking of rigid supports and impulse measurement; 14) Check the unlocking status of rigid supports and the status of flexible connections; 15) Removal of rigid supports.

5. The unlocking impulse measurement method according to claim 4, characterized in that, Step 2) includes: transferring the assembly to the unlocking impulse test area, adjusting the ground support fixture to align it with the interface of the assembly, placing the assembly on the ground support fixture, and connecting the ground support fixture and the load adapter structure.

6. The unlocking impulse measurement method according to claim 4, characterized in that, Step 9) includes: adjusting the position of the effective load through the effective load gravity unloading device and the flexible connection link attitude adjustment device; aligning and connecting the flexible connection link attitude adjustment device with the top hole of the flexible connection link; and adjusting the height of the rigid support limiting device to protect the flexible connection link during the process.

7. The unlocking impulse measurement method according to claim 4, characterized in that, Step 13) includes: from the time of detonation to the end of the test, a high-speed camera measures the speed of the rigid support and the flexible connection; and a laser vibrometer measures the speed of the rigid support.

8. The unlocking impulse measurement method according to claim 4, characterized in that, Step 15) includes: disconnecting the rigid support limiting device from the lower flange of the rigid support and the load adaptation structure, and moving the rigid support limiting device horizontally out.

Images