Study on Topology Optimization of Constrained Damping of Commercial Vehicle Floor

Abstract

The constrained damping is often used to improve the vibration characteristics of the floor of commercial vehicles. In order to obtain a reasonable layout of the constrained damping of the floor, the topological optimization design of the constrained damping on floor was conducted using the ESO (evolutionary structural optimization) method. Targeting the maximization of the modal loss factor and the amount of material as constraint condition, the joint simulation analysis is carried out with MATLAB and NASTRAN. In order to analyze the influence of sensitivity filter radius parameters on topology optimization results, the finite element model of rectangular plate was established and different filter radius parameters were set up for simulation analysis. The results show that the modal loss factor of the structure increases first and then decreases with the number of iterations. When the sensitivity filtering radius is increased, the modal loss factor of the structure is also increased first and then decreased. A clear damping boundary and a structural modal loss factor can be obtained when the sensitivity filtering radius is greater than 10 times the element size. The results based on rectangular plate are applied to the cab floor, and the first and third orders are optimized. The first order modal loss factor increases 3.7% and the third order is improved by 9.2% when the material content is 50% of the total laying. The effect of optimization is obvious.