新型磁流变液阻尼器在装载机悬架系统的应用研究

发布时间：2018-07-24 20:44

【摘要】：随着时代和科技的进步,人们对车辆的行驶稳定性和乘坐舒适性提出更高的要求,因此半主动悬架技术受到学术界和工业界的广泛关注。磁流变液作为一种新型智能材料,可以在外加磁场作用下,实现液态和半固态的快速转化,其转化过程是可控制和可逆的。磁流变液阻尼器根据磁流变液的特性而设计的,具有响应速度快、可控性好、功耗低和结构相对简单,输出力大等优点,非常适合在车辆悬架系统中应用。为此,本文设计出新型自馈能磁流变液阻尼器,将其配备在ZL50轮式装载机悬架系统中,其意义在于通过理论分析和仿真试验,得出这种磁流变液阻尼器设计原理和方法,从而为早日开发出节能降耗和高可靠性的半主动磁流变液悬架系统提供有价值的设计依据和实施手段。论文的具体内容如下: 第1章,阐述了本课题研究的背景和意义;分别概述了国内外磁流变液、磁流变液阻尼器、车辆悬架系统和悬架控制系统的研究现状和存在的问题;针对ZL50轮式装载机悬架系统存在的问题,提出本文的主要研究内容。第2章,着重设计单出杆式的新型馈能磁流变液阻尼器,根据Bingham力学模型,建立其输出力的模型。对该新型磁流变液阻尼器的机械结构和磁路进行多目标优化设计;对阻尼器的馈能部分即馈能发电机进行结构设计;在Matlab/simulink中建立该阻尼器的模型,分析其外特性。第3章,建立正弦路面激励的数学模型;简要介绍悬架系统的性能评价指标;建立装载机的半主动悬架系统和被动悬架系统模型;判断半主动悬架系统的稳定性,推导出悬架系统的传递函数,分析其幅频特性;分析悬架系统参数对其响应的影响状况。第4章,分析悬架系统可观测性和可控性。设计了线性二次最优控制器、模糊控制器、模糊神经网络控制器和馈能控制,在Matlab/Simulink中对此四种控制策略进行仿真分析对比。最后,对本论文的研究工作和成果进行总结;最后指出本文所存在的不足,并展望下一步的研究工作。
[Abstract]:With the development of the times and science and technology, people put forward higher requirements for vehicle driving stability and ride comfort, so semi-active suspension technology has been widely concerned by academia and industry. As a new intelligent material, magnetorheological fluid (MRF) can realize the rapid transformation of liquid and semisolid under the action of external magnetic field, and the conversion process is controllable and reversible. The magneto-rheological fluid damper is designed according to the characteristics of the magnetorheological fluid. It has the advantages of high response speed, good controllability, low power consumption, relatively simple structure and large output force. It is very suitable for application in vehicle suspension system. In this paper, a new type of magneto-rheological fluid damper with self-fed energy is designed and equipped in the suspension system of ZL50 wheel loader. Its significance lies in the design principle and method of the magneto-rheological fluid damper through theoretical analysis and simulation test. It provides valuable design basis and practical means for the early development of semi-active magnetorheological suspension system with energy saving and high reliability. The main contents of the thesis are as follows: in Chapter 1, the background and significance of the research are described, and the magneto-rheological fluid damper, the magnetorheological fluid damper, and the magneto-rheological fluid damper at home and abroad are summarized respectively. The research status and existing problems of vehicle suspension system and suspension control system, aiming at the existing problems of ZL50 wheel loader suspension system, put forward the main research contents of this paper. In chapter 2, a new type of magneto-rheological fluid damper with single output rod is designed. According to the Bingham mechanical model, the output force model is established. The mechanical structure and magnetic circuit of the new magnetorheological fluid damper are optimized by multi-objective design; the energy fed generator of the damper is designed; the model of the damper is established in Matlab/simulink and its external characteristics are analyzed. In chapter 3, the mathematical model of sinusoidal road excitation is established; the performance evaluation index of suspension system is introduced briefly; the semi-active suspension system and passive suspension system model of loader are established; the stability of semi-active suspension system is judged. The transfer function of suspension system is derived and its amplitude-frequency characteristic is analyzed, and the influence of suspension system parameters on its response is analyzed. Chapter 4 analyzes the observability and controllability of suspension system. The linear quadratic optimal controller, fuzzy neural network controller and energy feedback control are designed. The four control strategies are simulated and compared in Matlab/Simulink. Finally, the research work and results of this paper are summarized, and the shortcomings of this paper are pointed out, and the further research work is prospected.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH243;TB535.1

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