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This paper presents the research on the laws of systematic-parameter dependent variation in the vibration amplitude of drum-brake limit cycle oscillations (LCO). We established a two-degree non-linear dynamic model to describe the low-frequency vibration of the drum brake, applied the centre manifold theory to simplify the system, and obtained the LCO amplitude by calculating the normal form of the simplified system at the Hopf bifurcation point. It is indicated that when the friction coefficient is smaller than the friction coefficient at the bifurcation point, the amplitude decreases; whereas with a friction coefficient larger than the friction coefficient of bifurcation point, LCO occurs. The results suggest that it is applicable to suppress the LCO amplitude by changing systematic parameters, and thus improve the safety and ride comfort when applying brake. These findings can be applied to guiding the design of drum brakes. 相似文献
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为了实现双拇指手位置的精确控制,将模糊控制和滑动模态控制相结合,建立手指关节的状态方程,通过模糊控制规则确定滑动模态控制量,减小了滑模控制器的颤抖。仿真结果表明模糊滑动模态控制不仅可以抑制抖动而且具有良好的性能。 相似文献
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油泵恢复性差是机械式喷油泵常见的主要故障之一,此故障不仅影响企业生产油泵的进度,而且还对发动机的性能有严重影响,直接导致发动机游车或抖动问题。本报告主要针对配RSUV调速器的P型喷油泵恢复性差问题进行了原因分析和解决方案。 相似文献
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文章结合××-××试验任务海上浮筏通信系统应用的实际,论述了该系统的基本组成,并从有线传输、同步复用和无线信道传输入手,着重 对微波接力机各个环节锁相环做了综合性的分析,揭示了锁相环抖动累积的原因。在对锁相环环路性能论证的基础上,提出了浮筏通信系统设计中各个接口环 节抑制或降低抖动的方法。 相似文献