磁 流 变 起 落 架 的 开 关 控 制 落 震 载 荷 减 缓 实 验

The magneto-rheological buffer of the landing gear is a semi-active damper designed based on the magneto-rheological effect. It can adjust the damping level of the buffer by varying the current of the exciting coil，thereby alleviating the landing load of the landing gear. We design a magneto-rheological buffer with on-off control and test the circuit dynamic response of the magneto-rheological buffer. To solve the time delay problem of the circuit response，an on-off controller with local negative feedback is proposed and designed to adjust the excitation coil current of the magneto-rheological buffer to alleviate the drop load. The effectiveness of alleviating the landing load is validated through the drop test. The results show that using the on-off control strategy with local negative feedback，we can reduce the peak value of the drop load by 10. 3%，compared with the case in which the exciting coil is not energized （i. e. ，the oleo-pneumatics buffer）.