调节阀阀芯变开度振动分析

利用ANSYS软件建立丫可变压差下自动调节阀阀门内部流场模型以及阀芯模型，对流场和阀芯进行耦合力学分析阀芯的大位移运动，同时做实验验证此方法。用任意拉格朗日-欧拉（ALE）有限元计算方法分析流场。阀芯和流场有大位移运动的共同边界采用流体-固体耦合约束，并在计算中采用预测-多步校正算法，避免了反复迭代所导致的过大计算量。通过理论研究和实验发现，当由气动执行机构控制的调节阀开度调节时，阀芯有个振动的过程，且阀芯的振动是一种有规律的衰减振动。

Analysis of core vibration of regulating valve in regulation process

The interior flow field model and valve core model of the automatic control valve under variable differential pressure were established using ANSYS software.The coupling mechanical method was used to analyze the large displacement motion of the valve core,and experiments were carried out to verify this method.Arbitrary Lagrangian-Eulerian(ALE)finite element computational method was used to solve Navier-Stokes equations numerically.The common boundary of the valve core and the flow field that have large displacement motion was defined by the fluid-solid coupling restraint.The predictor-corrector algorithm was adopted in the computation to avoid the oversized computation burden caused by repeated iterations.Theoretical studies and experiment results discover that the valve core has a vibration process when the pneumatic actuator regulates the valve to a certain opening position,and the valve core vibration is a damping vibrating process.