摘要
针对新一代特种车辆油气弹簧减振阀频繁出现零部件失效的问题,通过对该结构进行有限元仿真,对其内部流场和关键结构件表面的压力场进行了研究。对油气弹簧进行了数学建模,结合其工作原理推导了其阻尼力的计算公式;采用三维软件对其阻尼结构和周围油液流场进行了物理建模,并基于ANSYS Workbench平台对其进行了流固耦合仿真,通过和试验的压差测试结果比较,验证了仿真模型的准确性,得到了油液流场的压力和流速计算结果。研究结果表明:油气弹簧阻尼结构的核心流场流速和压力分布十分不均匀,最大流速出现在常通孔内,最大压力出现在阀座大头一侧,开阀压差为53.8 MPa左右,开阀后两侧的压差急剧减小,阀芯耦合面的压力分布不再周向均匀;该研究结果可为后续的可靠性研究和优化设计提供一定的参考依据。
Aiming at the problem of frequent failure of components in hydro-pneumatic spring damper of new generation special vehicles,the internal flow field and the pressure field on the surface of key structural parts were studied through the finite element simulation of the structure.The mathematical model of the hydro-pneumatic spring was established,and the calculation formula of its damping force was derived based on its working principle.The damping structure and the surrounding oil flow field were modeled by 3D software,and the fluid structure coupling simulation was carried out based on ANSYS Workbench platform.The accuracy of the simulation model was verified by comparing with the experimental pressure difference test results,and the calculation results of the pressure and velocity of the oil flow field were obtained.The results show that the velocity and pressure distribution in the core flow field of the hydro-pneumatic spring damping structure are very uneven,the maximum velocity appears in the through hole,the maximum pressure appears in the big end side of the valve seat,the pressure difference is about 53.8 MPa to open the valve,the pressure difference decreases sharply after opening the valve,and the pressure distribution on the coupling surface of the valve core is no longer uniform in the circumferential direction.This provides a certain reference for the follow-up reliability research and optimization design.
作者
闻华殿
刘震涛
赵韬硕
张旭
WEN Hua-dian;LIU Zhen-tao;ZHAO Tao-shuo;ZHANG Xu(Power Machinery and Vehicular Engineering Institute,Zhejiang University,Hangzhou 310027,China;China North Vehicle Research Institute,Beijing 100071,China)
出处
《机电工程》
CAS
北大核心
2021年第9期1091-1098,共8页
Journal of Mechanical & Electrical Engineering
基金
内燃机可靠性国家重点实验室开放基金资助项目(skler-201807)。
关键词
油气弹簧
减振阀
流固耦合
仿真模型
hydro-pneumatic spring
damping valve
fluid-structure coupling
simulation model
