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首页> 外文会议>International Conference on Fluid Power Transmission and Control(ICFP' 2005); 20050405-08; Hangzhou(CN) >Modelling, Control Strategies and Applications for Alternating-flow Hydraulic System
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Modelling, Control Strategies and Applications for Alternating-flow Hydraulic System

机译：交流液压系统的建模，控制策略及应用

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摘要

Alternating-flow hydraulic (AFH) system is a new type of hydraulic system, and AFH technique was first used in military field in 1920s, civilian industry in 1960s. However, it differs from the traditional direct-flow hydraulic (DFH) system in operation mechanism, modelling methods, control strategies and applications, as well as some peculiarities. AFH system transfers signals and energy by piping or pulsation of actuating medium in tubes, especially suit for source of vibration. Although there is some commonness of the two, nothing but modelling, control strategies and applications is to be discussed in the article. The mathematical model (transfer function, differential equation, etc.) can be determined theoretically from first principles. There are some common methods, such as bond graph method, hydraulic resistance networks theory, subsystem coupling method etc. However, a difficulty remains, namely, how to find the parameters or to get precise mathematical model in consequence of the typical unknown and uncertain nonlinearity of AFH system. For DFH system, there are standard test procedures for determining these parameters. But for AFH system, these techniques don't work as well. Therefore, we often have to resort to more generic experimental methods for determining the parameters of mathematical model. In recent years, electro-hydraulic servo system has been applied to AFH system. This type of AFH system is superior to traditional cam-type driven one. However, electro-hydraulic servo system PID control method can't meet the increasing request of control quality. Although precise mathematical model can be set up in some cases, it is always so complex that makes the analysis, design and practice of the traditional control method based on the model more difficult. The intelligent control based on knowledge and not reliant to the precise mathematical model gives new ideas for solving these problems. Fuzzy control and neural network control are two kinds of artificial intelligent control methods. Integration of fuzzy control, neural network control and traditional PID control for AFH electro-hydraulic servo system is discussed in the paper. Owing to its limited applications and some undesired disadvantages such as low efficiency and strong noise, AFH technique advances heavily in the past decades. AFH components and systems and their application domains are introduced at the end of the article. The present research status and potential applications in the future of the AFH technique are expected.
机译：交流液压（AFH）系统是一种新型的液压系统，AFH技术在1920年代的军事领域和1960年代的民用工业中首次使用。但是，它在操作机构，建模方法，控制策略和应用以及某些特殊性方面与传统的直流液压（DFH）系统不同。 AFH系统通过管道或驱动介质中脉动介质的脉动传递信号和能量，特别适合于振动源。尽管两者有一定的共同点，但本文仅讨论建模，控制策略和应用。可以从第一原理理论上确定数学模型（传递函数，微分方程等）。常用的方法有键图法，水力阻力网络理论，子系统耦合法等。但是，由于典型的未知和不确定的非线性，如何找到参数或获得精确的数学模型仍然是一个难题。 AFH系统。对于DFH系统，有确定这些参数的标准测试程序。但是对于AFH系统，这些技术效果不佳。因此，我们经常不得不采用更通用的实验方法来确定数学模型的参数。近年来，电液伺服系统已经应用于AFH系统。这种AFH系统优于传统的凸轮式从动系统。但是，电液伺服系统的PID控制方法不能满足对控制质量日益增长的要求。尽管在某些情况下可以建立精确的数学模型，但它总是非常复杂，以致于难以基于模型对传统控制方法进行分析，设计和实践。基于知识而不依赖精确数学模型的智能控制为解决这些问题提供了新思路。模糊控制和神经网络控制是两种人工智能控制方法。本文讨论了AFH电液伺服系统的模糊控制，神经网络控制和传统PID控制的集成。由于其有限的应用和一些不良的缺点，例如效率低和噪音大，AFH技术在过去的几十年中取得了长足的进步。本文末尾介绍了AFH组件和系统及其应用领域。预计AFH技术的研究现状和未来的潜在应用。

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