Fatigue Performance Prediction And Lightweight Improvement Research Of Commercial Vehicle’s Cab

Based on a commercial vehicle cab as the research object, this paper used the softwaressuch as Virtuallab, Hyperworks, Nastran and Isight to solve the fatigue strength problem ofthe commercial vehicle cab’s body in the proving ground test. The whole technical routeconcludes the collection and processing of road load spectrum, load forecasting, the finiteelement solution, cab optimization design improvements and final physical test whichformed a complete process and system of cab fatigue validation. At the same time, the keytechnology such as multi-body dynamics modeling,multi-objective optimization andvirtual load iteration were discussed and introduced in detail. This research project iscompound of three technology parts as follows:1. Fatigue load data acquisition of commercial vehicle cabThe accuracy of the fatigue load data on commercial vehicle cab is the basis andpremise of the fatigue forecasting project. Some technology such as Multi-body dynamicsapproach solution,collection and processing method of road load spectrum were introducedin detail and this paper especially describe the content on how to simulate the dampingcomponents and the technical breakthrough of low-frequency iteration technique.2. Fatigue strength test and solution of commercial vehicle cabThere’s a large of relations between accuracy of body fatigue prediction with cab’sfinite element model. During the studies we found that mesh form and modeling standardson the key parts of the car body directly affects the overall body fatigue performance, whichwill make difficulties for the engineers to judge the fatigue performance of cab. This articlealso compared the physical test results with simulation results so as to correct defect model.At the same time, we built the modeling standards and methods of fatigue analysis which isas a reference for industry engineering peers.3. Multi-objective optimization of the cab of commercial vehiclesCommercial vehicle cab structural improvements in the process and performanceimprovement programs have often relied on experience, it is difficult to find optimalsolutions that match the structure. To resolve this issue, this study is the first attempt to use the ISIGHT software and cab sheet metal parameters of orthogonal array experiment andthen using response surface methodology, established the optimal approximation model onthe multi-objective optimization of the cab, the results is satisfied. This method is the firstattempts for the research, it will continue the research as well as application developmentperformance and body design. Overall, the studies of the methods and experiences of theproject will be shared with everyone, and I hope the coworkers and experts criticize on theshortcomings of this article.