The invention provides a method for optimizing automobile body damping distribution. The method comprises the following steps: a finite
element model of a composite damping plate is constructed, an automobile body is taken as a flexible panel of the composite damping plate, and a layer of conode bias shell elements for simulating a damping material is arranged on the flexible panel; values of assigned frequencies in a
noise transfer function are solved in a preset frequency range,
sound pressure amplitudes of the assigned frequencies are obtained, and corresponding target
sound pressure values are set for the assigned frequencies; a target function is determined, and a
topological optimization model is established with the
relative thickness of a damping unit as a design variable and the
mass of the damping unit as a constraint condition;
modal analysis is performed on all the shell elements on the composite damping plate according to the finite
element model, the
topological optimization model of each
shell element is solved, and an automobile body damping distribution nephogram and a
noise transfer function curve are obtained. With implementation of the method, damping distribution is designed,
global optimization processing of all modals in a certain frequency range is realized, and the inhibition action of damping distribution on
noise radiation can be improved obviously.