Modal Sensitivity Analysis And Structural Optimization Of The Cab Of The Engineering Vehicle

With governmental guidance and substantial support on infrastructure projects in recent years,engineering trucks have been widely used in many engineering projects.As one of the most important parts,mine truck cab bears loads frequent change and operation in poor environment.Thus,safety reliability and vibration comfort of mine truck cab always disappointing.Decreasing dynamic disturbance from external excitation frequency and improving dynamic behavior of mine truck cab have practical significance and project value.Based on vibration control theory,research on dynamic behavior of mine truck cab combines technologies of finite element simulation,modal test and structure optimization.On the basis of three dimensional model of the cab,finite element model established by pro-processing software Hypermesh.Numerical modal parameters figured by the solver and modal evaluation system built from perspectives of inherent frequency and modal shapes.At the same time,modal test was applied to the sample cab to acquire the real modal parameters and verify the veracity of finite element model.First overall torsional frequency was close to engine idle frequency which resulted vibration of the cab.So,structure optimization is discussed in this paper to solve the problem.In order to avoid aimless optimization,frequency sensitivity analysis and mass sensitivity analysis were done to find sensitivity parts of the cab.Finally,30 parts of the cab were selected to be optimized based on the parts' thickness.The improving of first overall torsion frequency was set as optimization object and overall mass of the cab was set as constraint condition.Optimal combination of thickness parameters was obtained after size optimization.The finite element model was also verified after optimization.This paper gives a systematic investigation on dynamic behavior of mine truck cab.By applying technologies of finite element simulation,modal test and structure optimization,first overall torsion frequency was improved without mass increase and vibration comfort was also improved by optimization.The done research also provides valuable reference for designing and developing engineering truck on big scale,especially interiorly.