基于三维动网格的驱动气缸启动特性研究

Research on Starting Characteristic of Pneumatic Cylinder Based on 3D Dynamic Mesh

针对汽车安全座椅坐垫倾角调节装置对其驱动机构的特殊要求,根据其结构和工作原理,建立气缸启动阶段的三维模型,并将模型进行网格划分。根据FLUENT软件提供的计算方法和湍流模型,结合UDF(用户自定义函数)和动网格技术进行了模拟计算,并搭建实验台进行实验验证。使用验证后的模型分析了启动气管通道长度、启动压力、活塞直径和喷口高度这几个参数对气缸启动特性的影响。结果表明:对启动特性影响最大的是启动通道长度,其次是启动压力,活塞直径在一定范围内对其有影响,而喷口高度的影响很小。研究结果为坐垫倾角调节装置驱动气缸的优化提供了理论依据。

Aiming at the special requirement on the driving mechanism by vehicle seat cushion obliquity adjustment device,a three dimensional(3D) model of cylinder starting stage was built and the model was meshed according to its structure and operating principle.Based on the calculation methods and physical flow models of FLUENT software,in combination with User-Defined Function(UDF) and dynamic mesh technique,simulated calculation was performed and result was verified by experiments with built test platform.The factors which affected the starting characteristic of the pneumatic cylinder,such as length of starting channel,starting pressure,piston diameter and nozzle height,were analyzed with the verified model.The result show that: the length of starting channel has the largest influence on starting characteristic,the starting pressure is the one followed,and the piston diameter has impacts on it in a certain range,while the smallest one is the nozzle height.The research result provides theoretical basis for the optimization of driving pneumatic cylinder of obliquity adjustment device.