耦合作用下各载荷对结构疲劳损伤影响程度的评估方法

Evaluation Method for Influence Degree of Each Load on Fatigue Damage of Mechanical Structure under Coupling Effect

针对传统评估方法不能评定多荷载耦合作用下各载荷分别对机械结构疲劳损伤的影响程度,提出在不需识别各耦合载荷大小的情况下,基于载荷与动应力响应的传递关系进行解耦,利用疲劳损伤影响参数,评估各载荷对机械结构疲劳损伤影响程度的方法;并以轨道车辆转向架齿轮箱吊座为例验证了所提出评估方法的可行性和实用性;分析结果可为载荷、机械结构的进一步优化提供依据。

The traditional evaluation method can not assess the influence degree of each load on the fatigue damage of the mechanical structure under multiple-load coupling. A new evaluation method is proposed to evaluate the influence degree of each load by decoupling the load without identifying the value of each coupling load based on the transitive relation between load and dynamic stress response with the help of fatigue damage influencing parameters. Taking the gear box bracket of track vehicle bogie as an example, the feasibility and practicability of the proposed method has been validated. The analysis results can provide the basis for the further optimization of the load and mechanical structure.