直线压缩机滑模变结构控制方法研究

发布时间：2018-01-07 18:40

本文关键词：直线压缩机滑模变结构控制方法研究　出处：《东北大学》2011年硕士论文　论文类型：学位论文

【摘要】：直线电机驱动的压缩机具有传统旋转电机驱动的压缩机不可比拟的优势,由于可以直接将电能转化为直线运动的机械能,因此不需要将旋转运动转化为直线运动的曲柄连杆机构,提升了压缩机的机械效率,简化了机械结构,减少了能量传递环节。直线压缩机具有体积小巧、结构紧凑、能耗低、效率高等优点,在对节能、环保要求越来越高的当今社会,直线压缩机的应用前景必将十分广阔。本文在分析了目前直线压缩机控制方法的基础上,针对活塞运行速度不稳定,抗扰动能力弱,控制不精确等问题,研究适合于直线压缩机活塞速度控制的智能方法。首先系统分析了动磁式直线压缩机内部结构和工作原理,根据直线压缩机等效磁路模型,对电机磁路和电磁推力关系式进行了推导,建立了电磁系统数学模型；同时,将压缩机机械系统等效为一个单质量单自由度的弹簧阻尼振动系统,建立了机械系统模型,完成了对直线压缩机整体数学模型的建立,为控制算法的研究奠定了理论基础。基于被控对象的数学模型,以提高系统性能及抗扰动能力为目标,首先运用传统PID控制策略,通过最小Mr和最大γ两种工程设计方法设计控制器参数,运用Matlab/Simulink进行仿真分析,系统受到恒值外力扰动情况下,其响应曲线会产生波动且恢复时间较慢,说明传统PID控制的鲁棒性不强；引入滑模变结构控制理论,设计了滑模变结构控制器,通过仿真分析,系统在一定范围的恒值扰动作用下能够实现完全不敏感,其抗干扰能力大幅提高,但抖振现象的存在对系统造成不利影响；为削弱抖振现象的影响,基于模糊控制理论,将模糊控制与滑模变结构控制相结合,设计了模糊滑模控制器,通过控制器参数的调节,系统在抗干扰能力提高的同时,抖振现象也得到了有效抑制,使系统达到了令人满意的动态和静态响应特性。
[Abstract]:The linear compressor has the advantages of small volume , compact structure , low energy consumption , high efficiency and the like , and has the advantages of compact volume , compact structure , low energy consumption and high efficiency . On the basis of analyzing the current control method of linear compressor , the intelligent method suitable for linear compressor piston speed control is studied aiming at the problems of unstable piston operation speed , weak anti - disturbance ability and imprecise control . Firstly , the internal structure and working principle of dynamic magnetic linear compressor are analyzed . According to the equivalent magnetic circuit model of linear compressor , the relationship between the magnetic circuit and the electromagnetic thrust is deduced , and the mathematical model of the electromagnetic system is established . At the same time , the mechanical system is equivalent to a single - mass single - degree - of - freedom spring damping vibration system , the mechanical system model is established , and the establishment of the integral mathematical model of the linear compressor is completed , and the theoretical foundation is laid for the study of the control algorithm . Based on the mathematical model of the controlled object to improve the system performance and the anti - disturbance ability , firstly , the traditional PID control strategy is applied to design the controller parameters by the minimum Mr and the max .

【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH45;TP273

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