Abstract: Aiming to improve the service performance of a certain type of vehicle bellows, the structural parameters of the bellows were optimized. The finite element model for modal analysis and static analysis of the bellows was established, and the effects of thickness, wave height, valley radius of curvature and inner diameter on the first-order natural frequency and maximum stress value of the bellows were studied based on the single-factor variable method. Based on the principle of orthogonal test design and combined with the range analysis and variance analysis, the first-order natural frequency and maximum stress value were used as the optimization indexes, and the order of influence of each factor on the test indexes was determined. The optimal combination of structural parameters was obtained by the comprehensive balance method and the optimization results were verified. The results show that the first-order natural frequency and maximum stress value increase with the increase of thickness, decrease with the increase of wave height and inner diameter, and show a trend of decreasing and then increasing with the increase of valley radius of curvature. Through the range analysis and variance analysis, it can be concluded that the order of influence of each factor on the two indexes are: thickness, wave height, inner diameter, valley radius of curvature. The optimal combination of structural parameters is: thickness of 0.25 mm, wave height of 11.6 mm, valley radius of curvature of 1.30 mm, and internal diameter of 121.0 mm. The optimized bellows has higher natural frequency and lower stress level in service condition.
Keywords: bellows; modal analysis; static analysis; structural optimization; orthogonal test; variance analysis
合肥工业大学学报自科版