| This paper mainly studies how to eliminate extra force to finish loading test of a certain airplane landing gear simulator. First, the paper designs the loading system on the basis of given loading data. Then, it sets up the linear model of simulation and simulate. As for the extra force, it can't meet the required loading precision. In order to improve the loading performance, it measures the extra force and analyzes its characteristics. Some effective methods are given out to eliminate the extra force in this paper, such as variable structure PID control, position compensation, and velocity feedback. They greatly improve the performance of the loading system. But for the full-loading of fore-landing gear, it still can't meet the loading precision completely. At the end of this paper, the reason is simply given out. The feature of CVI programming language and hardware design is also introduced in detail with some chapters. |
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