with the development of finite element technology, finite element model is becoming to the main analysis tool. However, because some theoretic assumptions, unsuitable constraint and uncertain material property are applied, the simulation result of finite element model isn’t different from the testing data. In order to improve the design quality and safety of spacecraft, this paper deduced the formula of spacecraft finite element updating, developed the spacecraft finite element model updating system, the software mainly of five parts: the frequency response function calculation, the loading inverse solution, the finite element model updating, the data display, virtual experimentation. Software can complete exciting force inverse, parameter sensitivity analysis, parameters screening and finite element model updating. The calculation result of updated finite element model is in accordance with testing curve shape on the main vibration direction, first-order frequency error is ±5%, response error is ±10%. Software meet the need of finite element model updating, it provide a software base for spacecraft design.
Acording to the fact that the finite element model of electromagnetic vibration shaker for
virtual experiment is not accurate enough to complete accurately spacecraft test, made a correlation
analysis of the finite element output frequency response function and the measured frequency
response function by their correlation coefficients. Analyzed the sensitivity of the materials for FRF
and screened the parameters to update, made the correlation coefficient error of electromagnetic
vibration shaker finite element model frequency response function and the measured as the
optimization objective, the optimization and modification of shaker finite element model parameters
were completed by iteration method. The frequency response function of the modified finite element
model approximately agreed with the experimental frequency response function. It met the virtual
experiments of electromagnetic vibration shaker.
A novel intelligent driver based on digital signal controller (DSC) has been put forward for magneto-rheological (MR) damper. The working principles of MR damper were described, as well as the hardware circuit scheme of signal condition and MR damper driver etc. on account of TMS320F28335 DSC. A hierarchical control algorithm was designed and the studies for the performance of the driver were conducted. The results suggest that the driver could provide accurate drive current for MR damper, and meanwhile the respond time is less than 2ms, which can meet the drive requirements of MR damper.
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