Ground vibration test fixture for large-scale spacecraft

Abstract

The invention provides a ground vibration test fixture for a large-scale spacecraft. The ground vibration test fixture comprises a fixture main body, a first interface, a second interface, an upper end surface outer wall lug boss, a position limiting block and an upper end surface inner wall lug boss, wherein the first interface is arranged at the bottom of the fixture main body, the second interface is arranged at the top of the fixture main body, the upper end surface of the fixture main body is provided with the upper end surface outer wall lug boss and the upper end surface inner wall lug boss, and the position limiting block is arranged on the upper end surface outer wall lug boss and is used for limiting the transverse sliding of a limiting product. The ground vibration test fixture solves the problems of great weight, low intensity, low rigidity, low first-order base frequency and the like under the condition that an interface of an entity type large-scale vibration test fixture is enlarged. The fixture structure form adopts the rib plate type, the rigidity and the intensity of the large-scale vibration test fixture are greatly improved, the first-order frequency of the fixture is 3 to 5 times higher than that of an aircraft, and the safety and the reliability of the vibration test are greatly improved.

Description

technical field [0001] The invention relates to a vibration test fixture, especially a vibration test fixture with a large interface, in particular to a ground vibration test fixture for a large space vehicle. Background technique [0002] Vibration test is an important part of environmental test, and fixture plays an extremely important role in vibration test. The vibration test fixture transmits the vibration energy of the mechanical connection to the test piece from the vibration table, and it cannot be distorted during the energy transmission process. In the entire test frequency range of the vibration table, it is difficult to transmit the vibration energy of the moving coil to the table without distortion. Unreasonable fixture design, manufacture, installation and use are prone to "overvibration" and "undervibration". Even if the requirements of the control spectrum are barely met, the load on the control system will be increased, especially when the dynamic response ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at defects such as low structural strength, weak stiffness, low first-order frequency, and large mass of the solid-type large-scale vibration test fixture in the prior art when the interface expansion is nearly doubled and the fixture height is required to be not less than 900mm, the purpose of the present invention is to It is to provide a large interface rib type vibration test fixture

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