The electromagnetic repulsion mechanism（ERM）is core operating device of high-speed mechanical switch

and the huge operating forces brings strong transient impacts to the ERM and the entire transmission system in closing and opening operation. The purpose of this paper is to obtain mechanical characteristics and structural strength of the ERM. LS-DYNA is adopted to construct the finite-element calculation model of high-speed mechanical switch

and mechanical characteristics and transient impact stress are calculated. Experimental measurements by laser rangefinders were performed to obtain the closing and opening time-travel diagrams of a high-speed mechanical switch. Numerical results and experimental results have a good match

which confirms the effectiveness of the numerical simulation method. In addition

parametric optimizations for the aforementioned numerical model were conducted

thus to reduce the closing bounce

opening bounce and transient impact stress in different parts of highspeed mechanical switch. The numerical calculation method and optimized parameters have a good guidance to the analysis and design of high-speed mechanical switch.