Application Of Improved Krylov Subspace Method In Frame Optimization

With the continuous development and progress of society,vehicle plays an increasingly important role in human life,while people on the performance requirements of the vehicle more stringent.Among them,the comfort of the vehicle more and more get the attention of people.Frame as a vehicle assembly matrix and load matrix of the structure,the structure design of the fit and unfit quality directly determines the performance of the whole structure of the vehicle.Therefore,the frame of the optimal design scheme put forward higher requirements.The traditional design method based on experience,due to the existence of autonomy in the design process and poor design accuracy,low efficiency and other limitations,it is difficult to meet the design requirements of modern frame optimization design,so the use of more scientific optimization design method of the frame structure Optimized design has attracted wide attention.In this paper,a truck frame as the research object.First of all,The 3D geometry model of frame structure was established by Pro/E software.Secondly,the finite element model of the frame structure is established by using the finite element software Hypermesh,and the frame model is analyzed statistically under two typical conditions,and the modal analysis and frequency response analysis are carried out simultaneously.Which in view of the frame structure of the frequency response analysis,on the basis of the study of frequency response analysis theory,the Krylov subspace method is improved,and the frequency response analysis of the frame structure is carried out based on this algorithm,and the computational efficiency is improved under the guarantee of the accuracy of the calculation.Through the above analysis,the evaluation frame of the structure of the static stiffness,strength and dynamic characteristics,so as to find out the weak point of the frame structure,to offer a scientific basis for the follow-up frame structure optimization design.Finally,the components with large influence on the longitudinal vibration amplitude of the bracket of the frame are selected as the design variables by the sensitivity analysis.On this basis,the lattice structure is sampled by Latin hypercube test design method,and the support vector regression approximation model of frame model is established.And the mathematical model of its structure optimization is established based on the frame approximation model,and then the optimization model is optimized by genetic algorithm to obtain the final optimization result.It was verified that the vibration characteristics of the frame were improved and the maximum vibration amplitude at the cab support was reduced,and the frame quality was reduced.It up to the size optimization of frame structure design,improve the vibration characteristics and improve the comfort of the vehicle.