液力变矩器动态循环流量的传递函数表征法

Transfer Function Representation of Dynamic Circulating Flow Rate of Torque Converter

为快速求解液力变矩器循环流量的动态响应,提出液力变矩器动态循环流量的传递函数表征法.该方法基于一元束流理论的推导,以确定结构形态的液力变矩器为对象,将动态循环流量视为以静态循环流量为输入的一阶线性系统的响应,通过液力变矩器常用工况范围内的简单工况CFD(计算流体动力学)静态、动态仿真数据,构建动态循环流量系统的传递函数.仿真结果表明:此方法对液力变矩器常用工况范围内的动态循环流量的预测拟合优度达到0.987,对输入、输出轴动态扭矩的预测拟合优度达到0.95;相对于CFD仿真,此方法在小幅牺牲计算精度的同时大幅提升了计算速度,是一种快速求解液力变矩器动态响应的有效方法.

In order to rapidly solve the dynamic response of circulating flow rate of torque converter, a transferfunctions representation method for dynamic circulating flow rate is proposed. In this method, through the derivationon the basis of one-dimension flow theory, a torque converter with certain structure is selected as the research object,and dynamic circulating flow rate is regarded as a first-order linear system^ response with the input of staticcirculating flow rate. Then, the transfer function of dynamic circulating flow system is constructed according to thestatic and dynamic CFD （ Computational Fluid Dynamics） simulation data under simple working conditions intorque converter’s common working range. Simulated results show that the proposed method helps achieve a fitgoodness of 0. 987 for dynamic circulating flow rate prediction in common working range, and a fit goodness of 0. 95for input and output shafts7 dynamic torque prediction; and that, in comparison with CFD simulation, the proposedmethod greatly increases the calculation speed only with a slight decrease in calculation accuracy, so that it is effectivein rapidly solving the dynamic response of torque converter.