圆形电源连接器随机振动分析与结构优化

Random Vibration Analysis and Structure Optimization of Circular Power Connector

对电连接器进行模态分析和随机振动分析,运用正交试验的方法,研究接触件不同的结构参数对电连接器固有频率、最大应力和接触件间隙的影响,选出最优的水平组合,并对优化前后电连接器的固有频率、最大应力和接触件间隙值进行比较;最后根据Miner累积损伤理论对电连接器的疲劳寿命进行预测。结果表明:径向加载时的电连接器最大应力值与接触件间隙值比轴向加载时大;冠簧宽度对电连接器一阶固有频率影响最大,冠簧长度对电连接器最大应力影响最大,冠簧厚度对接触件间隙影响最大;通过优化冠簧结构尺寸,可以减小电连接器受振动载荷时的接触件间隙值,最大应力值也会大幅下降,一阶固有频率值有明显上升;优化前后电连接器都未发生疲劳失效,优化后的总体损伤值与优化前相比下降较大,优化后的结构尺寸可以大幅增强电连接器的疲劳寿命。

In order to study the influence on the electric connector inherent frequency, maximum stress and contact clearance of the different structure parameters of contact element, by the orthogonal experiment method, a modal analysis and random vibration anal-ysis to electrical connector were conducted, and the optimal level combination was obtained. The natural frequency, the maximum stress and contact gap value of the electric connector of the electrical connector were compared before and after optimization. At last, using the Miner linear cumulative damage theory, the fatigue life of the electric connector was predicted. The results indicate that, the maximum stress value and the contact gap of radial load of the electric connector are bigger than axial loading. The width of spring crown has the biggest influence on first-order natural frequency, the length of spring crown has the biggest influence on maximum stress, and the thickness of spring crown has the biggest influence on contact element clearance. By optimizing the structure size of the crown spring, the contact clearance can reduce when the electric connector contact by vibration load, the maximum stress value will also fell sharply and the first-order natural frequency values has rise obviously. The electric connector has no fatigue failure before and after optimization, the overall damage value after optimization is declined larger compared with before optimization, and the optimized structure size can greatly enhance the fatigue life of electric connector.