分布质量作用下悬臂梁系统的建模研究

he dynamic modeling of a cantilever beam under distributed mass is investigated by combining finite element (FE) analysis with parameter identification. By using a series of spring approximate to the boundary conditions of the cantilever beam and the contact/impact relation between the beam and the distributed mass, the dynamics characteristic of junction surface is simulated and the finite element dynamical model is formulated. The impact excitation method is employed to measure the modal property of the system with consideration of different status, and parameters of the system are identified by using optimal design theory. The rationality of the model and the feasibility of the parameter identification method are validated by the good agreement between experimental result and numerical calculation result.