【作者】 秦二卫；

【导师】 姜继海；

【作者基本信息】 哈尔滨工业大学 ， 机械电子工程， 2010， 硕士

【摘要】 直接驱动容积控制电液伺服系统(DDVC)是交流伺服电动机技术在液压领域中的成功应用。这种新型的伺服系统具有电动机易控制和液压大出力的双重特点,且没有节流、溢流损失,其能量的利用率较高,在频响要求不高的场合,可以替代传统的阀控式电液伺服系统,达到高效节能的目的。大量的相关文献表明:美日等国对直驱系统的研究已经比较成熟,已将其应用到多个相关领域,取得了一定的经济效益。但系统的动态特性不好使其应用场合受到很大的制约,但目前对直驱式系统的研究多着眼于该系统在实际工程中的应用,缺乏系统性能改进方面的研究,而且研究者对直驱式压力控制系统的研究也较少,这直接限制了直驱式系统在工程领域中的推广,因此继续深入开展对直驱式位置及压力控制系统的研究,具有重要的学术价值及广阔的应用前景。通过对传统电液伺服系统与直驱式电液伺服系统的比较分析,阐述了直驱式电液伺服系统的工作原理、组成及特点。对系统的各个部分进行了详细分析之后建立了直驱式位置控制及压力控制系统的数学模型,并对二者的开环频率特性以及稳定性进行了分析。针对直驱式位置控制系统存在起步及转向阶段的大时滞、运行过程中的正反向不对称性等特点,本文在对比分析传统PID控制与模糊控制的基础上,设计出了模糊PID控制器,并进行了相关的仿真分析,仿真结果显示出该控制器具有良好的控制性能。在数学模型基础上进行了压力控制系统的仿真分析,结果表明具有良好的输出力控制性能。另外为了分析系统中相关元件对系统性能的影响,本文进行了系统元件匹配方面的仿真分析,为直驱系统的设计以及改进提供了理论依据。制定了直驱式容积控制电液伺服系统的实验研究方案,搭建了位置控制以及压力控制实验台,并分别设计了二者的控制系统,进行了直驱式位置控制以及压力控制实验,实验结果验证了理论分析的正确性。另外,在分析不同排量液压泵对系统性能影响的基础上结合直驱式系统运行时液压泵的转速情况,提出了直驱式系统设计时液压泵的选用原则。更多还原

【Abstract】 Direct Drive Volume Control Servo System (DDVC) which combines AC servo motor technology and frequency conversion technology is a successful application in hydraulic. This new type of servo system is both easy to control, combines the characteristics of large hydraulic output, but also because there is no overflow throttling losses, the higher their energy efficiency, in certain situations, can replace the conventional valve control servo system, reaches high efficiency energy-saving purposes.A large number of relevant literature shows that: United States and Japan study on the direct-drive system is relatively mature, and the system has been applied to a number of related areas, made great economic benefits. However, the dynamic characteristics of the system is not very good so that applications are very well constrained, also, the current direct-drive system and its application more focused on the position control system, pressure control system is relatively less, it is also directly limited its application in related fields, thus carrying out the research on direct-drive system, improving its performance, is significant for its practical value and expanding its scope of application.Through the comparative analysis of Conventional electro-hydraulic servo system and direct drive servo system, this paper described the working principle of the direct-drive system, composition,strengths and weaknesses. Various parts of the system were established after detailed analysis of the direct drive position control and pressure control system model, and both open-loop frequency characteristics and stability were analyzed.For Direct Drive Volume Control System there is a big start and the steering phase delay, the operation process of positive and negative asymmetry and the long run to the hydraulic oil when the nonlinear characteristics, this paper designed the fuzzy PID controller based on the analysis between the traditional PID control and fuzzy control , and conducted the related simulation. Simulation results showed that the controller had good control performance.In the mathematical model based on the pressure control system simulation analysis show the output power with good control performance. Furthermore, in order to analyze system-related components of the system performance, this paper carried out the simulation about element matching aspects of the system ,which provides a theoretical basis for direct-drive system design and improve.This paper developed a research program, built position control and pressure control test-bed, designed the control systems, and carried on the experiment of direct drive position control and pressure control, the experimental results showed that the theoretical analysis is correct. Based on the analysis of the influence which caused by the pump to the system, and combined with the speed of the pump when DDVC system works, the principle to choose the pump in design of DDVC was derived.更多还原