共查询到18条相似文献,搜索用时 156 毫秒
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以电液伺服三轴仪伺服轴向力的伺服系统为研究对象,采用定量反馈理论(QFT)设计的鲁棒控制器进行控制其设计,并利用AMESim软件建立液压系统的动态数学模型,代替传统的传递函数所建立模型的进行联合仿真。研究表明,QFT控制器可以有效抑制参数扰动,如弹性负载刚度变化、油液有效体积弹性模数变化,系统摩擦力变化。工程上易于实现,可以有效地改善伺服三轴仪的控制性能。 相似文献
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定量反馈理论(QFT)是一种新颖的频率域鲁棒控制技术,在N ichols图上开展分析与设计。针对大包线范围内系统模型变化大的特点,可采用QFT设计横航向控制器。由于QFT主要针对单输入单输出(SISO)系统进行分析,因此首先应采用特征结构配置(EA)理论将无人机的横航向模态进行近似解耦,将多输入多输出(M IMO)系统转化为SISO系统,再采用QFT进行控制系统设计。本文将两种控制方法结合起来,构成综合优化飞行控制方法,针对某型无人机包线范围内选取的18个状态点组成的控制对象模板进行控制设计,并进行非线性仿真。仿真结果表明设计的控制器使得无人机在全包线范围内具有较好的性能和鲁棒稳定性。 相似文献
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提出了一种适用于伺服系统的基于QFT理论的控制器设计方法;考虑到伺服控制系统对象模型参数存在一定摄动,设计了鲁棒性能控制器;通过综合考虑被控对象的模型不确定范围和系统的性能指标.可实现一定范围模型摄动系统的强鲁棒性。仿真结果表明设计的控制系统总体性能优于经典PID设计的系统。 相似文献
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设计了一种新型数字式电动执行器控制系统,该系统扩展了网络通信和遥控调试等功能:受控系统对象模型存在不确定性,同时电动执行器控制系统对给定值有无超调跟踪性能要求,为此设计了基于定量反馈理论(QFT)的二自由度控制器。硬件调试和控制算法仿真实验证明系统的是实际可行的。 相似文献
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基于QFT的电液力伺服系统的鲁棒控制 总被引:3,自引:2,他引:3
采用QFT方法,对电液伺服加载系统进行了鲁棒控制器设计。结果表明,控制器能够有效地抑制参数扰动,如弹性负载刚度变化、有效体积弹性模数变化等。控制器结构简单,工程上易于实现,有较高的实用价值。 相似文献
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定量反馈理论(QFT)是一种比较新颖的频域鲁棒设计方法。介绍了QFT的基本原理,并通过铣床加工控制来说明QFT的设计思路和方法。仿真结果显示,采用QFT方法可以获得良好的控制效果,容易满足性能要求。 相似文献
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以数控滚齿机伺服控制系统为研究对象,分析了系统的结构组成和工作原理,建立了驱动系统控制器的数学模型,在传统控制算法基础上,选用PI交叉耦合控制算法,开展了伺服控制系统加载状态下的仿真分析研究。结果表明:与传统控制算法相比,基于PI交叉耦合控制算法的伺服控制系统具有更高的控制精度,能更加有效地控制和降低数控机床的同步误差,保证了数控机床的加工精度;同时,在数控机床驱动系统设计过程中,可参考此算法对控制系统进行设计优化。该研究实现了传统控制算法的理论突破,对数控滚齿机伺服控制系统的性能优化设计具有重要的参考意义。 相似文献
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Yoonsu Nam 《Journal of Mechanical Science and Technology》2000,14(12):1358-1364
A dynamic load simulator which can reproduce, on-ground, the aerodynamic hinge moment of control surface, is an essential rig for performance and stability test of aircraft actuation system. The hinge moment varies widely in the flight envelope depending on specific flight condition and maneuvering status. To replicate the wide spectrum of this hinge moment variation within some accuracy bounds, a force controller is designed based on the Quantitative Feedback theory (QFT). A dynamic model of load actuation system is derived, and compared with the experimental results. Through this comparison, a nominal plant model of load actuation system with some uncertainty bounds is developed. The efficacy of QFT force controller is verified by numerical simulation, in which hydraulic actuation system dynamics of aircraft control surface is considered. 相似文献
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In this paper, the equivalent disturbance rejection (EDR) in QFT design methodology is proposed for dealing with sampled-data systems with time-delay. This EDR is mainly to overcome the non-minimum phase zero generated by the first order Pade' approximation of the time-delay factor. Due to plant parameter uncertainty, the analogue controller is to be designed so that the system response lies within permissible bounds. By approximate Z-transform, the analogue controller can be transformed directly into a digital one and then the analogue plant is transformed into the digital plant, with sampling time as a free parameter. By adjusting the sampling time, the uncertain sampled-data system can be stabilized. In comparison with other approaches, our design framework is much more systematic by using only algebraic manipulations and transparent enough to guide the designer to realize the physical controller for the plant with prescribed bounds on its parameters. 相似文献
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为了满足国内对中高端测试分选设备的需求,提高测试分选机的效率,通过参阅大量的文献,并且仔细研究了国外的转塔式测试分选机,拟制了TX900型转盘式QFN测试分选机的系统设计。论述了TX900型QFN测试分选机的工作原理及运行过程,运用模块化设计方法建立了系统结构模型,并详细论述了各部分的结构设计;接着介绍了设备的电气控制结构和控制软件设计,给出了控制程序流程图;最后讨论了该机的关键技术及解决方案。研究结果表明,该机具有效率高、兼容性强、扩充性强等特点。整个系统设计为转盘式QFN测试分选机最后的实现奠定了基础。 相似文献
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This paper presents the design of a quantitative feedback control system for a three-axis hydraulic road simulator. The road
simulator is a multiple input-output (MIMO) system with parameter uncertainties which should be compensated with a robust
control method. The objective of the present paper is to reproduce the random input signal or real road vibration signal by
three hydraulic cylinders. The replaced m
2 MISO equivalent control system is suggested, which satisfies the design specification of the original m×m MIMO control system by decoupling each of the three axes. Quantitative Feedback Theory (QFT) is used to control the simulator.
The QFT illustrates a tracking performance of the closed-loop controller with low order transfer function G (s) and pre-filter F (s) having the minimum bandwidth for the uncertain plant with parameter uncertainty. The efficacy of the designed controller
is verified through dynamic simulation, which is co-simulated with hydraulic models of Matlab and Adams multi-body. The simulation
and the experimental results show that the proposed control technique works well for uncertain hydraulic plant systems. 相似文献