【作者】 常虹；

【导师】 姜继海；

【作者基本信息】 哈尔滨工业大学 ， 机械电子工程， 2009， 硕士

【摘要】 在近十几年来,借于液压技术领域中应用成熟的容积控制系统和电机领域交流伺服电机广泛应用的背景下,出现了直接驱动容积控制电液伺服系统(Direct Drive Volume Control,简称DDVC)或称无阀电液伺服系统。电液伺服系统以其出力大,响应快,精度高等优点被广泛用于航天、国防以及各民用工业甚至日常生活中;交流伺服电动机则以其可靠性高,控制方便等优点在自动控制领域中具有广阔的发展前景。直驱式容积控制电液伺服系统综合了二者的优点,具有体积小,结构简单,节能高效,易于计算机控制等显著优点,被认为是液压控制的重要发展方向之一。通过查阅大量的国内外相关文献,国外尤其是美国和日本等国对此系统的研究已趋于成熟,目前已经将直驱式电液伺服系统应用在多个领域中,并取得了很大的经济效益。但系统动态特性不高的问题也使其应用场合受到限制。因此对直驱式容积控制电液伺服系统进行研究,对提高系统的性能与实际应用价值、拓展系统的应用前景具有重要的意义。本文分析了给水泵汽轮机传统阀控式调速方式的优缺点,通过与直驱式电液伺服系统作对比,阐述了直驱式电液伺服系统的原理、组成和优缺点,并对直驱式电液伺服系统进行了结构设计、理论分析和试验研究。本文对系统的吸排阀和锁阀组成的集成阀块、密闭油罐及直驱式系统的其它连接部件进行了结构设计。同时还建立交流伺服电机的数学模型,分析泵控非对称液压缸动力机构的原理并建立其数学模型,最终得出直驱式电液伺服系统的数学模型。讨论了各项参数对系统性能的影响,通过系统的开环频率特性分析了系统的稳定性及稳态误差,并在此基础上进行了系统计算机仿真研究。搭建了直驱式电液伺服系统的试验台,对系统进行了试验研究,从而验证了数学模型的正确性。采用PID控制策略可以改善系统的动态特性,使系统能够满足控制要求。更多还原

【Abstract】 In the last decade, by the application of mature volume control systems and widely used AC servo motor areas, the direct drive volume control(Direct Drive Volume Control, referred to DDVC) electro-hydraulic servo system is came out, which also named electro-hydraulic servo system with no electro-hydraulic servo valve. Electro-hydraulic servo system has the high power, high intensity and fast response. It has been applied extensively in many fields such as space flight, national defense and some other industry fields. At present, AC servo system has perfect development and foreground in the field such as automation with good reliability and convenient control performance. The DDVC electro-hydraulic servo system is the outcome of them. It possesses many advantages such as smaller bulk, simpler construct, energy saving being prone to control with computer and some others, so the system is considered as one of the most important directions in the field of hydraulic-control.Having looked up related literatures and reference materials at home and abroad, especially in foreign countries such as the United States and Japan, their study of this system has become more mature, and now they have used the direct drive volume control electro-hydraulic servo system in many areas, and they already have a great economic benefits. But the weakness of dynamic performance restricts its further application. Therefore, it is great significant to study of the DDVC electro-hydraulic servo system to enhance the performance of the system.This paper analyzes the advantages and disadvantages of traditional valve control forms in the feed water pump turbine, and through comparison with the DDVC electro-hydraulic servo system, expounding the principles, composition, the advantages and disadvantages of DDVC electro-hydraulic servo system. Also, make a design, theoretical analysis and experimental studies on DDVC electro-hydraulic servo system.This paper designs the compositive valves which components of fill oil valves and lock valves, closed oil tank and device connector. At the same time, establishing the AC servo motor mathematical model, analyzing the principle of pump-controlled hydraulic unsymmetrical cylinders power machine and establishing the mathematical model. In addition, establish the mathematical model of the whole DDVC system. Last, analyzing the parameters that influence the system’s performance,through the frequency characteristics of open-loop system analyzing stability and the steady-state error, and simulating with computer.To build up a test-bed for DDVC electro-hydraulic servo system, taking the experiment in order to verify the correctness of the mathematical model. PID control strategy can be used to improve the system dynamic characteristics, enabling the system to meet the control requirements.更多还原