Spatial multidimensional micro-vibration simulator based on six-dimensional parallel mechanism

Abstract

The invention relates to a spatial multidimensional micro-vibration simulator based on a six-dimensional parallel mechanism, in particular to a parallel mechanism based on the Stewart-Gough platform. The spatial multidimensional micro-vibration simulator comprises an upper platform, a lower platform and six driving legs, wherein the upper platform and the driving legs are connected through spherical hinges; the lower platform and the driving legs are connected through hook joints; the driving legs are composed of components like voice coil motors, leaf springs and stop sleeves, and can output vibration with the maximum amplitude of 3 mm and the maximum frequency of 500 Hz in the axial direction. According to the spatial multidimensional micro-vibration simulator based on the six-dimensional parallel mechanism, provided by the invention, by adjusting expansion and contraction of the six driving legs to control the six-dimensional motion of the upper platform and the load thereof, the simulation of spatial micro-vibration can be completed; the vibration mode output by the simulator is multidimensional random vibration with specific spectrum form, the effective bandwidth is 0.5-100 Hz, and the shock excitation magnitude is 10<-5> g-10<-3>g.

Description

technical field [0001] The invention belongs to the technical field of spacecraft, and in particular relates to a space multi-dimensional micro-vibration simulator based on a six-dimensional parallel mechanism. Background technique [0002] A variety of equipment carried on the spacecraft, such as refrigeration compressors, solar panel rotation mechanisms, attitude adjustment gyroscopes, etc., will produce tiny vibrations. These tiny vibrations have the characteristics of wide frequency band distribution, small amplitude, and complex forms, which seriously affect the imaging quality of optical remote sensors on space vehicles. A common solution is to isolate the optical remote sensor from vibration. In order to evaluate the effectiveness of vibration isolation systems on aircraft, extensive ground tests are required, and the premise of this work is to be able to reproduce the spectral characteristics of these small vibrations. Therefore, it is a subject of great significan...

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Problems solved by technology

[0003] At present, many scholars have done a lot of work on the research of multi-dimensional vibration simulators. Among them, Hostens et al. designed a six-dimensional vibration simulator, which has the characteristics of large amplitude and narrow frequency band. Park et al. developed A multi-dimensional micro-vibration simulator for simulating a reaction flywheel, but there is a certain difference between the disturbance force generated by the device and the target value due to the influence of coupling factors

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