Finite-element Based Dynamic Modification for Gear TransmissionWANG Qing1,2,ZHANG Yi-du2,ZHANG Hong-wei2,LI Ding-shi2 (1.College of Safety & Environment Engineering,Capital University of Economics and Business,Beijing 100026,China;2.School of Mechanical Engineering & Automation,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)The finite-element model set with the meshed stiffness matrix of coupling vibration for the bevel gear transmission is established,and the technology of sensibility analysis of dynamic character and dynamic modification is elaborated.The dynamic characteristics of bending-tensional-axial-swing coupling vibration are calculated.The sensibility analysis of dynamic character is carried out using the results of finite-element analysis.A dynamic modification method for improving system dynamic characteristics is presented.The practice of this paper made valuable attempts of the engineering application for the dynamic modification of structure.gear;meshed stiffness;dynamic characteristics;sensibility;dynamic modification