关键词: 畜禽运输车, 有限元, 模态分析, 灵敏度分析, 轻量化

Abstract: In order to reduce the high production cost and use cost of existing livestock and poultry transport vehicles, and improve the fuel economy of vehicles, this paper takes the skeleton of 8×4 livestock and poultry transport vehicles as the research object, and uses HyperMesh software to establish a finite element model of the skeleton of a livestock and poultry transport vehicle. The main body of the carriage is analyzed under vertical, steering and braking conditions. According to the analysis results, the stiffness and strength of the main part of the carriage are excessive. Due to the large number of components in the car, it is not possible to efficiently and targeted to determine the impact of key components on the overall performance of the car. Therefore, sensitivity analysis is used to obtain sensitivity functions of mass, firstorder torsional mode and steering condition respectively. The relative sensitivity of modal and steering conditions to mass is calculated respectively, and the components with smaller absolute value of relative sensitivity are selected. These components are used as design variables to optimize the size of the carriage frame. Under the rationality of ensuring the optimization structure, a total of 448 kg was lost, the weight loss rate reached 11.5%, and the lightweight effect was obvious.

Key words: livestock and poultry transport vehicle, finite element, modal analysis, sensitivity analysis, lightweight