某轻型卡车副水箱支架振动开裂分析与结构优化

Vibration Cracking Analysis and Structure Optimization of a Light Truck Expansion Tank Bracket

为了解决某轻型卡车副水箱支架的开裂问题,首先采集副水箱支架激励端在各个路况下的振动加速度,测试结果表明其在带角度搓板路面的加速度最大。然后基于模态频率响应方法并结合副水箱支架总成有限元模型及其频域载荷对其进行振动强度分析,分析结果表明其应力集中点与开裂位置一致,并且其最大应力超过材料极限值,不满足强度性能要求。再基于集成平台并采用第二代非劣排序遗传算法对其进行优化与分析,分析结果表明优化之后其应力水平均低于材料屈服强度,并且实现了轻量化。最后对其优化方案进行应力对标,测试结果表明其仿真值与测试值基本一致,并且顺利通过了整车道路可靠性验证。

Aiming at solving the cracking problem of a light truck expansion tank bracket.Firstly,the vibration accelerations of expansion tank bracket excitation end under various road conditions were collected,the test results showed that the accelerations of angular washboard road were larger than other roads.Secondly,it was vibration strength analyzed based on its finite element model and frequency domain load by adopt modal frequency response method,the analysis results showed that its stress concentration point was consistent with the cracking position,and its maximum stress exceed the material limit value,it didn't meet strength performance requirements.Thirdly,it was optimization designed and analyzed by adopting integration platform and non-dominated sorting genetic algorithm,the analysis results showed that its stress level was lower than the material yield strength,and the lightweight was achieved.Lastly,its optimization scheme was stress benchmarked,the test results showed that its simulation value was basically consistent with the test value,and it successfully passed the vehicle road reliability verification.