Papers by Author: Lei Li

Abstract: Joint configuration reveals some nonlinearity under different conditions. In this paper, a bolted joint structure subjected to different preload and external excitation is designed to study the nonlinearity dynamic characteristics of assembled structure. At the same time, nature frequent and damping nonlinear characteristics of the bolted connection are analyzed based on energy dissipation theory. The urgency of discussing the nonlinear characteristics of the joint configuration is discussed, and the theoretical and experimental foundation was established.

Abstract: Joint parameters identification is a key problem in the modeling of complex structures. Aimed to solve the joint problem effectively in finite element analysis (FEA), the joint parameters (stiffness and damping) of a linear rolling guide were identified by measuring frequency response functions (FRFs). Hertz contact theory compared with the frequency domain identify method identified the correction of the experiment results. Modal analysis based FEA method coupled with modal test was used to analysis the dynamic characteristics of the linear rolling guide, which confirms that the proposed method can be successfully applied to evaluate the dynamics characteristics of mechanical systems of various configurations.