An Optimization Approach to Improving Eigenvalues of Light-Weight Beam Structures

摘要

This paper presents a structural optimization approach to reduce vibration, which is a key issue in the structural design of components for head positioners. This method can be used in the concept design stage of head arms for hard disk drives. Head arm vibration modes that affect the accuracy of head positioning are discussed to obtain the feasible design domain of eigenvalues. An optimization algorithm based on a projection method is formulated to obtain the shape with the maximal eigenvalue under a constant weight. The formulation is applied to a primitive head arm model, simultaneously considering the bending mode and the lateral bending mode. The conditions for maximization of the eigenvalues are not the same for both modes. This paper treats the vibration problems of head arms and shows that a feasible domain of natural frequencies can be found for any given weight.