Multi-dimensional vibration simulation device based on structural coupling

Abstract

The invention relates to a multi-dimensional vibration simulation device based on structural coupling. The multi-dimensional vibration simulation device comprises an upper platform, a simulation connecting piece and a lower platform; the lower platform is fixedly mounted on a mounting table board of a one-dimensional vibration table; the upper platform and the lower platform are in rigid connection through the simulation connecting piece; and a tested load is fixedly installed on the upper platform. Different modal frequencies and vibration modes of the upper platform can be constructed by adopting different forms of simulation connecting pieces, structural coupling in different directions is generated with one-dimensional vibration of the one-dimensional vibration table, three-dimensionalsimulation vibration meeting the requirement is constructed, and the measurement requirement of a three-dimensional test is met; a mechanical vibration isolation environment can be constructed through different simulation connecting pieces, coupling vibration in the non-main-vibration direction is reduced, the flexibility of a vibration test is greatly improved, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of spacecraft vibration tests, in particular to a multi-dimensional vibration simulation device based on structural coupling, which can realize three-dimensional vibration excitation for a measured load on a one-dimensional vibration table, adapt to complex vibration conditions, and improve It improves the flexibility and efficiency of vibration test. Background technique [0002] At present, the spacecraft needs to carry out vibration tests aimed at launch mechanics in the initial sample and positive sample stages, generally including sinusoidal vibration tests and random vibration tests, and the test requirements are generally for x, y, and z directions. Three tests are required, but due to the structural coupling of the spacecraft itself, when the vibration test is performed in a single direction, the non-main vibration direction will also vibrate, so each vibration will cause simultaneous vibration in th...

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Problems solved by technology

[0002] At present, the spacecraft needs to carry out vibration tests aimed at launch mechanics in the initial sample and positive sample stages, generally including sinusoidal vibration tests and random vibration tests, and the test requirements are generally for x, y, and z directions. Three tests are required, but due to the structural coupling of the spacecraft itself, when the vibration test is performed in a single direction, the non-main vibration direction will also vibrate, so each vibration will cause simultaneous vibration in three directions, so the vibration test in three directions After the completion, the actual vibration conditions experienced by the spacecraft must be more stringent than the intensity required for the test. If vibrations in three directions can be input at the same time, it is most in line with the actual test requirements and can avoid repeated vibrations; It is one-dimensional vibration. To complete the vibration test in three directions, the vibration table needs to be flipped and debugged, which increases the time cost

At present, there is no breakthrough in the technology of three-dimensional vibrating table at home and abroad, and there are few literature reports on this kind of equipment.

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