A device and method for testing the output torque of a satellite reaction flywheel

Abstract

This invention discloses a satellite reaction flywheel output torque testing device, comprising a reaction flywheel, a torque transmission mechanism, an air-bearing platform, an adaptive self-aligning mechanism, a support mechanism, a torque sensor, a sensor connecting block, and a base; the reaction flywheel is connected to the torque sensor via the torque transmission mechanism; the torque sensor is fixed to the base via the sensor connecting block; the air-bearing platform and the adaptive self-aligning mechanism are sequentially arranged on the support mechanism, and the air-bearing platform is configured to support the reaction flywheel via an air film; the support mechanism and the base are connected by fasteners; the base is fixed to the ground by anchor bolts.

Description

Technical Field

[0001] This invention relates to satellite attitude and orbit control subsystems, and more particularly to a satellite reaction flywheel output torque testing device. Background Technology

[0002] The reaction flywheel is a crucial actuator in the satellite attitude and orbit control subsystem, used to compensate for disturbance torques generated by payload motion in real time. The accuracy of the reaction flywheel's torque output affects the compensation effect, thus impacting the satellite's attitude stability. Therefore, it is necessary to study a reaction flywheel output torque testing device to measure the output torque of the reaction flywheel. Currently, a commonly used method for measuring the output torque of a reaction flywheel integrates an optical encoder inside the torque compensation wheel. By counting and accumulating the pulse signals output by the optical encoder, the angular displacement is obtained, and then the second derivative is performed to obtain the angular acceleration. The torque output by the reaction flywheel is then indirectly obtained according to Newton's second law. This method is affected by the resolution and differential time interval of the optical encoder, resulting in a relatively large measurement error. Another method involves indirectly measuring the output torque of the reaction flywheel using a torque converter. The drawback of this method is that there is a positioning error between the stator and rotor of the torque converter, which affects the measurement of the reaction flywheel's output torque.

[0003] Therefore, those skilled in the art are dedicated to developing a satellite reaction flywheel output torque testing device and method with the smallest possible error. Summary of the Invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is a satellite reaction flywheel output torque testing device with the smallest possible error.

[0005] To achieve the above objectives, the present invention provides a satellite reaction flywheel output torque testing device in a first aspect, comprising a reaction flywheel, a torque transmission mechanism, an air-bearing platform, an adaptive self-aligning mechanism, a support mechanism, a torque sensor, a sensor connecting block, and a base; the reaction flywheel is connected to the torque sensor via the torque transmission mechanism, and the torque sensor is fixed to the base via the sensor connecting block; the air-bearing platform and the adaptive self-aligning mechanism are sequentially arranged on the support mechanism, and the air-bearing platform is configured to support the reaction flywheel via an air film; the support mechanism and the base are connected by fasteners; the base is fixed to the ground by anchor bolts.

[0006] Furthermore, the adaptive self-aligning mechanism includes a spherical support and a self-aligning spherical surface.

[0007] Furthermore, oil lubrication is used between the spherical support and the self-aligning spherical surface.

[0008] Furthermore, the torque transmission mechanism is used to connect the reaction flywheel and the torque sensor, including a connecting rod and an air-bearing support block.

[0009] Furthermore, the upper part of the connecting rod is directly connected to the reaction flywheel, and the lower end is connected to the torque sensor; the air-bearing support block is connected to the connecting rod, and its lower surface is the air-bearing platform support surface.

[0010] Furthermore, the support mechanism and the base are connected by screws, and the base is fixed to the ground by anchor bolts.

[0011] The second aspect of this invention provides a method for testing the output torque of a reaction flywheel, comprising the following steps:

[0012] The support mechanism and the base are connected by fasteners; the base is fixed to the ground by anchor bolts.

[0013] The air flotation platform and the self-aligning mechanism are sequentially installed onto the support structure;

[0014] The reaction flywheel is installed on the air-float platform and the self-aligning mechanism. The reaction flywheel and the torque sensor are connected through the torque transmission mechanism. The torque sensor is fixed on the base through the sensor connecting block.

[0015] The air-floating platform uses an air-film support torque compensation wheel;

[0016] The internal rotor of the torque compensation wheel undergoes acceleration and deceleration movements.

[0017] The torque sensor outputs a voltage signal, which is then used to calculate the reaction torque output by the reaction flywheel.

[0018] Furthermore, the adaptive self-aligning mechanism includes a spherical support and a self-aligning spherical surface.

[0019] Furthermore, oil lubrication is used between the spherical support and the self-aligning spherical surface.

[0020] Furthermore, the torque transmission mechanism is used to connect the reaction flywheel and the torque sensor, including a connecting rod and an air-bearing support block.

[0021] Furthermore, the upper part of the connecting rod is directly connected to the reaction flywheel, and the lower end is connected to the torque sensor; the air-bearing support block is connected to the connecting rod, and its lower surface is the air-bearing platform support surface.

[0022] Furthermore, the support mechanism and the base are connected by screws.

[0023] The air-floating platform and adaptive self-aligning mechanism of the torque testing system in this invention greatly reduce the influence of interference torque caused by gravity and the misalignment between the reaction flywheel and the central axis of the torque sensor on the measurement of the output torque of the reaction flywheel.

[0024] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a satellite reaction flywheel output torque testing system in a preferred embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of an adaptive centering mechanism in a preferred embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the working principle of the satellite reaction flywheel output torque testing system in a preferred embodiment of the present invention;

[0028] Figure 4 This is a structural diagram of an air flotation platform in a preferred embodiment of the present invention. Detailed Implementation

[0029] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0030] A specific embodiment of the satellite reaction flywheel output torque testing system according to the present invention is as follows: Figure 1 As shown, the system includes a reaction flywheel 1, a torque transmission mechanism (including a connecting rod 4 and an air-bearing support block 10), an air-bearing platform 2, an adaptive self-aligning mechanism 3, a support mechanism 6, a torque sensor 5, a sensor connecting block 7, and a base 8. First, the upper part of the reaction flywheel 1 and the connecting rod 4 in the torque transmission mechanism are connected by screws, and the lower part of the connecting rod 4 is connected to the torque sensor 5 via a coupling 9; the torque sensor 5 is fixed to the base 8 via the sensor connecting block 7. Second, the air-bearing platform 2 and the adaptive self-aligning mechanism 3 are sequentially mounted on the support mechanism 6 through positioning holes. The support mechanism 6 and the base 8 are connected together by screws, and the base 8 is fixed to the ground by anchor bolts. Finally, the air-bearing platform 2 supports the reaction flywheel 1 by supporting the air-bearing support block 10 via an air film.

[0031] When the internal rotor of the reaction flywheel 1 accelerates and decelerates, a reaction torque is generated on the outer shell of the reaction flywheel 1. This reaction torque is transmitted to the torque sensor 5 through the connecting rod 4 in the torque transmission mechanism. After receiving the reaction torque output by the reaction flywheel 1, the torque sensor 5 outputs a corresponding voltage signal, which can then be used to calculate the reaction torque output by the reaction flywheel 1. The air-floating platform 2 supports the reaction flywheel 1 through the air-film support air-floating support block 10. On the one hand, this balances the weight of the reaction flywheel 1, thereby overcoming the crosstalk caused by the weight of the reaction flywheel 1 on the measurement of the torque sensor 5. On the other hand, it also greatly reduces the influence of the additional frictional torque generated by supporting the weight of the reaction flywheel 1 on the torque measurement system.

[0032] The adaptive self-aligning mechanism 3 of the torque testing system Figure 2 As shown, the adaptive self-aligning mechanism 3 includes a spherical support 32 and a self-aligning spherical surface 31, which are lubricated by oil. During the installation of the reaction flywheel 1 and the torque sensor 5, the adaptive self-aligning mechanism 3 utilizes the adaptive adjustment principle of the spherical connection to adaptively fine-tune the central axis of the torque sensor 5, ensuring that the central axis of the torque sensor 5 and the central axis of the reaction flywheel 1 are aligned, thus reducing measurement errors caused by inconsistencies in the central axes. If the central axes of the reaction flywheel 1 and the torque sensor 5 are not aligned, the adaptive self-aligning mechanism 3 will adjust them through slight twisting according to the adaptive adjustment of the spherical connection to ensure that their central axes are aligned.

[0033] like Figure 3As shown, the torque sensor 5 in the torque testing system outputs a corresponding voltage signal when subjected to the reaction torque from the reaction flywheel 1. This voltage signal is proportional to the reaction torque output by the reaction flywheel 1. The reaction torque output by the reaction flywheel 1 can be calculated based on the sensitivity of the torque sensor 5. The lower-level computer measurement and control system simultaneously collects the digital pulse signal output by the reaction flywheel 1 and the voltage signal output by the torque sensor 5 and transmits them to the upper-level computer software. After receiving the data collected by the lower-level computer measurement and control system, the upper-level computer measurement and control software calculates and processes the voltage signal output by the torque sensor 5 to obtain the output torque of the reaction flywheel. At the same time, it counts and accumulates the digital pulse signal output by the reaction flywheel 1 to obtain the angular displacement, then performs a second derivative to obtain the angular acceleration, and then indirectly obtains the reference output torque of the reaction flywheel according to Newton's second law. This reference output torque is compared with the output torque obtained by the torque sensor 5 to verify the reliability of the output torque obtained by the torque sensor 5. The air-floating platform 2 of the torque testing system mainly reduces the influence of gravity and the frictional torque generated by gravity on the measurement of the output torque of the reaction flywheel; while the adaptive self-aligning mechanism 3 of the torque testing system mainly overcomes the influence of the interference torque caused by the misalignment between the reaction flywheel and the central axis of the torque sensor on the measurement of the output torque of the reaction flywheel.

[0034] like Figure 4 As shown, in a specific embodiment of the present invention, the air flotation platform 2 includes an inner ring 21, an outer ring 22, and a throttling orifice 23.

[0035] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A satellite reaction flywheel output torque testing device, characterized in that, The system includes a reaction flywheel, a torque transmission mechanism, an air-float platform, an adaptive self-aligning mechanism, a support mechanism, a torque sensor, a sensor connecting block, and a base. The reaction flywheel is connected to the torque sensor via the torque transmission mechanism. The torque sensor is fixed to the base via the sensor connecting block. The air-float platform and the adaptive self-aligning mechanism are sequentially mounted on the support mechanism. The air-float platform is configured to support the reaction flywheel via an air film. The support mechanism and the base are connected by fasteners. The base is fixed to the ground with anchor bolts. The adaptive self-aligning mechanism includes a spherical support and a self-aligning sphere. The torque transmission mechanism connects the reaction flywheel and the torque sensor and includes a connecting rod and an air-float support block. The upper part of the connecting rod is directly connected to the reaction flywheel, and the lower end is connected to the torque sensor. The air-float support block is connected to the connecting rod, and its lower surface is the support surface of the air-float platform.

2. The satellite reaction flywheel output torque testing device as described in claim 1, wherein, Oil lubrication is used between the spherical support and the self-aligning spherical surface.

3. The satellite reaction flywheel output torque testing device as described in claim 2, wherein, The support mechanism and the base are connected by screws.

4. A method for testing the output torque of a satellite reaction flywheel using a satellite reaction flywheel output torque testing device according to any one of claims 1-3, characterized in that, Including the following steps: The support mechanism and the base are connected by fasteners; the base is fixed to the ground by anchor bolts. The air flotation platform and the self-aligning mechanism are installed sequentially on the support mechanism; The reaction flywheel and the torque sensor are connected by a torque transmission mechanism, and the torque sensor is fixed on the base by a sensor connecting block. The air-floating platform uses an air-film support to support a reaction flywheel; The internal rotor of the reaction flywheel accelerates and decelerates. The torque sensor outputs a voltage signal, which is then used to calculate the reaction torque output by the reaction flywheel.

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