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本文把平面四杆机构中的曲柄和连架杆视为无质量的弹簧,考虑集中质量和分布质量,以及机构输入,输出刚度,用广义有限元法求解机构的固有频率,用Rayleigh方法修正。提出了频率机率的概念,并运用该概念解释弹性四杆机构的低阶谐振现象。
In this paper, the crank and the connecting rod are considered as massless springs in the planar four-bar mechanism. The mass and distribution quality of the mechanism and the input and output stiffness of the mechanism are considered. The natural frequencies of the mechanism are solved by the generalized finite element method and corrected by the Rayleigh method. The concept of frequency probability is put forward and the low-order resonance of elastic four-bar mechanism is explained by this concept.