1 DSP的特征 微机和DSP(Digital Signal Processor数字信号处理器)同属数字式电子计算机,但它们分别是从不同的领域发展起来的技术产品。微机是从大型或者小型数字式电子计算机发展而来的;向超小型化、通用化方面发展的技术。而DSP则是...1 DSP的特征 微机和DSP(Digital Signal Processor数字信号处理器)同属数字式电子计算机,但它们分别是从不同的领域发展起来的技术产品。微机是从大型或者小型数字式电子计算机发展而来的;向超小型化、通用化方面发展的技术。而DSP则是从频谱分析器,滤波器等信号(波形)处理装置发展起来的;主要向数字化、软件化方向发展。展开更多
The high-pressure electro-pneumatic servo valve(HESV)is a core element of the high-pressure pneumatic servo system.The annular clearance and the rounded corner of the spool-sleeve can cause the leakage at null positio...The high-pressure electro-pneumatic servo valve(HESV)is a core element of the high-pressure pneumatic servo system.The annular clearance and the rounded corner of the spool-sleeve can cause the leakage at null position,thereby affecting high-precision control and stability of the servo system.This paper investigates the effects of the clearance structure on leakage behavior at null position of the HESV.A numerical approach was employed to evaluate the effects,and then a mathematical model was established to obtain the variation law of leakage flow rate at null position.The results indicate that the leakage flow rate at null position varies linearly with supply pressure and rounded corner radius,and is nonlinear as a quadratic concave function with annular clearance.The leakage flow rate of the annular clearance and the rounded corner varies with the valve opening in an invariable−nonlinear−linear trend.A test rig system of leakage behavior at null position of the HESV was built to confirm the validity of the numerical model,which agrees well with the conducted experimental study.展开更多
文摘1 DSP的特征 微机和DSP(Digital Signal Processor数字信号处理器)同属数字式电子计算机,但它们分别是从不同的领域发展起来的技术产品。微机是从大型或者小型数字式电子计算机发展而来的;向超小型化、通用化方面发展的技术。而DSP则是从频谱分析器,滤波器等信号(波形)处理装置发展起来的;主要向数字化、软件化方向发展。
基金Project(51705164)supported by the National Natural Science Foundation of China。
文摘The high-pressure electro-pneumatic servo valve(HESV)is a core element of the high-pressure pneumatic servo system.The annular clearance and the rounded corner of the spool-sleeve can cause the leakage at null position,thereby affecting high-precision control and stability of the servo system.This paper investigates the effects of the clearance structure on leakage behavior at null position of the HESV.A numerical approach was employed to evaluate the effects,and then a mathematical model was established to obtain the variation law of leakage flow rate at null position.The results indicate that the leakage flow rate at null position varies linearly with supply pressure and rounded corner radius,and is nonlinear as a quadratic concave function with annular clearance.The leakage flow rate of the annular clearance and the rounded corner varies with the valve opening in an invariable−nonlinear−linear trend.A test rig system of leakage behavior at null position of the HESV was built to confirm the validity of the numerical model,which agrees well with the conducted experimental study.
