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该文针对制动摩擦颤振现象,建立了摩擦制动装置的刚柔耦合动力学模型,应用伽辽金离散和数值计算,揭示了摩擦块的盘面振动与摩擦盘面外振动间的耦合关系(即内共振条件)对系统振动的影响,并分析摩擦块的颤振特点。分析可知,转速高于临界转速时,由于盘的弹性振动,摩擦块在盘内作近简谐周期运动,转速低于临界转速后,系统产生摩擦-滞滑颤振。运动耦合越强,滞滑-颤振出现的越早,引起的振动也越强烈和复杂。同时,由于盘的弹性振动对摩擦块产生强迫激励,会在一定转速范围内产生共振。
In this paper, based on the phenomenon of brake friction dither, a rigid-flexible coupling dynamic model of friction brake is established. By using Galerkin discretization and numerical calculation, the coupling relation between the friction of disk surface and the vibration of disk is revealed Ie internal resonance conditions) on the system vibration and analysis of the chatter characteristics of the friction block. The analysis shows that when the rotational speed is higher than the critical speed, the friction block moves in the disk near the harmonic period due to the elastic vibration of the disk. When the rotational speed is lower than the critical rotational speed, the system produces the friction-hysteresis flutter flutter. The stronger the kinematic coupling, the slower the slip-to-flutter occurs and the more intense and complex the vibration is. At the same time, due to the elastic disk vibration of the friction block has a forced excitation, will produce resonance within a certain speed range.