静力-随机振动复合工况下带钢丝网套补偿器的强度分析

STRENGTH ANALYSIS OF COMPENSATOR REINFORCED BY WIRE CLOTH UNDER STATIC-RANDOM VIBRATION COMBINED CONDITIONS

针对带钢丝网套补偿器中钢丝网套细观结构复杂,服役过程中钢丝网套与导管相互作用复杂的问题,建立了静力-随机振动复合工况下带钢丝网套补偿器的强度分析模型,采用等效梁模型建立钢丝网套的有限元分析模型,针对带钢丝网套补偿器服役环境及力学性能特点,建立了接触-耦合混合分析方法,在静力工况中采用接触模拟钢丝网套与波纹管间非线性的相互作用,在随机振动工况中通过设置耦合方程,通过耦合波峰与钢丝网套的径向自由度以建立钢丝网套与波纹管间的作用关系。该模型的静、动力分析结果与带钢丝网套补偿器的静、动力试验结果之间的误差均在10%左右。开展了钢丝网套补偿器在静力-随机振动分析复合工况下的强度性能分析,讨论了不同方向随机振动激励对带钢丝网套补偿器导管力学性能的影响。结果显示,X方向激励对结构影响最大;波纹管第一个波峰处应力最大,属于结构薄弱环节。

Aiming at the complicated microstructure of the wire cloth in the compensator reinforced by wire cloth and the complicated interaction between the wire cloth and the bellow during service, the strength analysis of the compensator reinforced by wire cloth under the static-random vibration compound condition is established. The equivalent beam model is used to establish the finite element analysis model of the wire cloth. According to the working environment and mechanical performance characteristics of the compensator reinforced by wire cloth, a contact-coupling hybrid analysis method is established. The contact relationship between the bellow and the wire cloth is used in static conditions to simulate the non-linear interaction with the bellow. In the random vibration conditions, the interaction between the wire cloth and the bellow is established by coupling the radial degree of freedom of the wave peak of the bellow and the wire cloth in setting the coupling equation. The error between the static and dynamic analysis results of the model and the static and dynamic test results of the compensator with wire cloth is about 10%. The strength performance analysis of the compensator with wire cloth under the combined condition of static and random vibration analysis is carried out, and the influence of random vibration excitation in different directions on the compensator with wire cloth is discussed. The results show that the X-direction excitation has the greatest impact on the structure;the stress at the first wave peak of the bellow is the largest, which is a weak link in the structure.