Topology optimization of micro hard disk driving arm frequency based on modal tracking technology

摘要

A working micro hard disk driving arm mainly produces vibration of three directions: longitudinal bending, torsion and transverse bending. In order to ensure that the natural frequency keeps away from the external excitation frequency to avoid the resonance phenomenon, the natural frequency and vibration mode of the structure are optimized with SIMP method, and then improve the dynamic characteristics of the micro hard disk driving arm. To maximize its natural frequency of first-order torsion, longitudinal bending and transverse bending, the driving arm structure topology optimization model of dynamic characteristics is established, which is based on the SIMP interpolation model. Introducing modal tracking technology to avoid the switch of modal shape, using sensitivity filtering technology to inhibit the numerical singularity problems like checkerboard, grid dependence, constructing a material renewed algorithm based on modal sensitivity sorting by Optimality Criteria, structural dynamic characteristic topological optimization is put forward aiming at maximizing the specific vibration mode frequency. Numerical results show that, the natural frequency of micro hard disk driving arm is significantly increased, which provides a new way to improve the dynamic performance of micro hard disk driving arm effectively.