【作者】 陈元建；

【导师】 权龙；

【作者基本信息】 太原理工大学 ， 机械电子工程， 2008， 硕士

【摘要】 二次调节静液传动技术是一种新型的液压传动技术。该技术是建立在恒压网络的基础上,通过改变传动系统中二次元件(轴向柱塞泵/马达)的斜盘倾角,从而改变其流量,来适应负载扭矩的变化。它能够在四象限内工作,重新利用系统的制动动能和重物势能,具有很高的效率和节能效果。二次调节静液传动系统实际上是一类系统的总称。这类系统按其应用范围可分为速度控制系统、位置控制系统、扭矩控制系统和功率控制系统。由于速度反馈是以上各类系统中都不可缺少的,因此,也可以按速度反馈的方式分为位移-弹簧-力反馈方案和电反馈方案,所谓位移-弹簧-力反馈方案,是指采用测速电机检测转速,通过位移-弹簧-力反馈比例控制阀,来实现对液压马达排量的控制;所谓电反馈方案,是指用测速电机或光电码器来测量马达轴的转速,实现转速反馈。针对阀控修磨机台车液压系统在工作过程中不停地启动、制动以及往复运动,造成了大量的能量损失,本论文提出采用二次调节技术的修磨机台车液压系统。论文首先对二次调节静液传动系统的组成及其工作原理进行分析和研究,利用MATLAB中的SIMLINK软件建立了位移-弹簧-力反馈比例变量泵的数字仿真模型,并对泵模型进行了动态仿真分析,作为力反馈系统结构设计仿真实验的理论依据。其次,以钢坯修磨机台车为系统的加载对象对二次调节静液传动系统进行建模。在建立各个元件数学模型的基础上得出二次调节静液传动系统的数学模型,作为系统仿真模型。最后对台车二次调节静液传动系统进行了节能特性分析并对系统各个工况参数对系统回收率的影响进行了深入的研究,仿真结果表明:系统的能量回收效率与系统的压力,系统的转速和负载驱动扭矩有关,且都随着各个参数的增大,系统的回收效率有所增加。采用常规PID控制方法分别采用两种系统方案对二次调节静液传动系统进行了转速控制实验,从仿真结果可以看出电反馈的转速控制效果要比位移-弹簧-力反馈的转速控制效果要好,但是,采用位移-弹簧-力反馈所需的生产成本低、性价比要比电反馈高。更多还原

【Abstract】 Secondary regulation of hydrostatic transmission technology is a new type of hydraulic drive technology. It is based on the net of constant pressure, accommodating the variety of the load by changing the camplate’s obliquity of the secondary unit (axial piston pump /motor),and so the flow changed, to adapt to the changes in load torque. By utilizing the four-quadrant characteristic of the secondary unit, the braking system of kinetic energy and potential energy heavy can be reused, so the technique has high efficiency and good effect of energy saving. Hydrostatic Transmission of secondary regulation is actually a generic term for a class of systems. Such systems can be divided into the speed control system, the position control system, the torque control systems and the power control systems by its scope of application. The speed feedback in the above systems are essential, as a result, It can be divided into displacement-spring-force feedback programme and electronic feedback programme. The so-called displacement-spring-force feedback programme is that using a speed measurement motor to detect speed and feedback the results to displacement - spring - force feedback proportional control valve, so the hydraulic motor displacement control is achieved. The so-called electronic feedback programmes is that using a speed measurement motor or a photoelectric codec instrument to measure the speed and achieve speed feedback.Because of the sharpening machine trolley hydraulic system in view of the valve is not to stop in the work process starts, the brake as well as the reciprocal motion, created the massive energy loss, the paper proposed that used secondary regulation technology in the sharpening machine trolley hydraulic system. First of all the paper research on the composition and working principle of the secondary regulation hydrostatic drive system,used the SIMLINK software to establish the displacement-spring-strength feedback proportion variable displacement pump’s digital simulation model, and has carried on the dynamic simulation analysis to the pump model. Secondly, take billet sharpening machine trolley as system’s load object to establish the mathematical models of secondary regulation hydrostatic transmission. In the foundation of establishing each part mathematical model, obtained the mathematical models of secondary regulation hydrostatic transmission, and takes the system simulation model. Finally, carryed on the energy conservation characteristic analysis of secondary regulation hydrostatic transmission system and conducts the thorough research to the system each operating mode parameter to the system returns-ratio influence. The result had indicated that system’s energy recovery efficiency related on the system’s pressure, system’s rotational speed and load actuation torque and along with each parameter’s enlargement, system’s recovery efficiency increases. Used the conventional PID control method to carry on the speed control experiment of the system, the simulation result shows that the electricity feedback is better compared to the displacement-spring-strength feedback speed control effect,but, the displacement-spring-strength feedback speed system is lower and the performance-to-price ratio is higher compared to the electricity system.更多还原