中文摘要：

针对现有气液压力机单通道供气控制模式存在输出力过冲量大、控制精度低等技术问题,设计了基于气液增压技术的双通道、双通径控制模式的气液压力机,大通径控制压力机供气速度,小通径控制压力精度。结合气路控制系统,建立了气液压力机气体质量流量模型和增压过程力学模型,在Matlab/Simulink仿真平台下实现压力机在不同气压、不同主通道节流孔截面积条件下的仿真,得出辅助通道截止压力以及压力机输出力最大偏差。仿真结果表明：辅助通道截止压力不变,主通道节流孔截面积相同时,气源压力越大,输出力最大偏差越大;气源压力相同,主通道节流孔截面积越小,输出力最大偏差越小。搭建了压力机实验平台,实验数据表明：输出力最大偏差小于100 N,与仿真数据吻合;辅助通道截止压力仿真数据可以作为压力机实际应用时双通道供气模式切换的控制依据。

英文摘要：

To solve the high output press overshoot and low control accuracy problem existed in gas-liquid press machine of single channel controlled mode,a gas-liquid press machine equipped with dual-channel and dual-aperture modes was designed based on the gas-liquid pressure technology,while the speed of press was controlled by the bigger aperture channel and the accuracy was controlled by the smaller one.In order to study the dual-channel gas-liquid press machine＇s features,the gas mass flow model and boost process mechanical model were established on basis of gas-liquid control system. For the sake of obtaining the cut-off pressure of auxiliary channel and the maximum deviation of output pressure,the models were simulated with different air pressures and various main channel orifice areas under Matlab /Simulink. The simulation results show that with the invariable cut-off pressure of auxiliary channel and the same main channel orifice area,the higher the air pressure goes,the greater the maximum deviation is; with the same air pressure,the smaller of main channel orifice area＇s size is,the smaller of maximum deviation is. To verify the feasibility of the cut-off pressure of auxiliary channel and the maximum deviation of output pressure,a testing platform was set up. The test result shows that the maximum deviation of output pressure is consistent with simulation result. The cut-off pressure of auxiliary channel from the simulation can be used as a basis for designing the dual-channel gas-liquid press machine in practical applications.