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本文对液压系统中普遍应用的进、回油路两种节流调速方案中速度转换的动态特性做了理论分析和实验研究。建立了油管、节流阀、油缸等基本液压元件的矩阵表达式,求得两种调速系统线性化的输出函数,并利用计算机求出数字解。文中提出了在液压系统工作转换中有“瞬时弹簧效应”存在,并求得了其简化的数学公式,分析了“瞬时弹簧效应”产生的原因及存在的条件,从而利用线性迭加方法求出实际系统的完整的输出函数。综合理论分析与实验研究,分析了进回油路两种调速系统的特点、联系、差别和应用范围。提出实际使用中进油路调速方案背压力的选择的动态依据。
This paper makes a theoretical analysis and experimental research on the dynamic characteristics of the speed conversion in two schemes of throttling and speed regulating, which are commonly used in hydraulic system. The matrix expressions of the basic hydraulic components such as oil pipe, throttle valve and fuel tank are established. The output functions of the two speed regulation systems are obtained linearly and the digital solution is obtained by computer. The paper presents the existence of “instantaneous spring effect” in the conversion of hydraulic system and obtains its simplified mathematical formula. The causes and existing conditions of “instantaneous spring effect” are analyzed, so that the practical application of linear superposition method The system’s complete output function. Comprehensive theoretical analysis and experimental study, analyzed the characteristics of the two into the oil return road speed control system, the contact, the difference and the scope of application. Put forward the actual use of oil into the road speed control program to choose the basis of the dynamic pressure.