共查询到17条相似文献,搜索用时 0 毫秒
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针对先进歼击机功率电传作动系统舵面控制的需求,提出了一种具有电气一液压复合调节容积式舵机的结构方案,并讨论了这种舵机的操纵状态和工作特性。在此基础上,推导了描述舵机动态特性的非线性状态方程。然后,采用非线性系统的几何控制理论,证明了系统满足精确线性化的条件,并给出了基于时间—误差性能指标(ITAE)最小的最优控制律,成功地解决了复合舵机控制系统存在的交联问题和相乘非线性问题。所提出的控制方法奠定了电气—液压复合舵机非线性控制理论的基础。 相似文献
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To control the position of differential cylinder closed loop without using any throttle elements, a new idea that two speed variable pumps are used to compensate the non-symmetric flow of differential cylinder is carried out. According to the leaking property of the system, a speed offset principle is also proposed to eliminate the cavitation and tension caused by the leakage and condensation of oil, which makes the system be in the same state as a valve controlled circuit. This principle is explained theoretically and experimentally. Further the relationship that the pressures in cylinder chambers change with load and leakage, and the relationship between biasing speed and pre-load pressures in cylinder chambers are established. The research has proved that the new system has similar technique features as those of controlled with servo valves, but due to the elimination of all the throttle lose the efficiency of system can be improved greatly. 相似文献
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ADAPTIVE VARIABLE STRUCTURE CONTROLLERS AND APPLICATION TO ENGINE IDLE SPEED CONTROL SIMULATION 总被引:2,自引:0,他引:2
Hui Qing Quyang MinggaoState Key Laboratory of AutomotiveSafety Energy Tsinghua University Beijing China 《机械工程学报(英文版)》2003,16(2):171-174
A neural-network-based adaptive variable structure control methodology is proposed for the tracking problem of nonlinear discrete-time input-output systems. The unknown dynamics of the system are approximated via radial basis function neural networks. The control law is based on sliding modes and simple to implement. The discrete-time adaptive law for tuning the weight of neural networks is presented using the adaptive filtering algorithm with residue upper-bound compensation. The application of the proposed controller to engine idle speed control design is discussed. The results indicate the validation and effectiveness of this approach. 相似文献
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气动人工肌肉是一种具有功率自重比/功率体积比大、响应快的新型气动元件,近年来已引起了人们广泛关注。然而,由于难于实现气动人工肌肉系统的精确控制,从而阻碍了其更加广泛的应用。在气动人工肌肉动态数学模型的基础上,提出采用基于CMAC的气动人工肌肉两层滑模变结构控制方法。CMAC神经网络用于学习气动人工肌肉系统的不确定信息,并作为前馈补偿使跟踪误差快速收敛,通过变结构控制消除网络的学习误差和不可重复随机干扰的影响,确保系统鲁棒性。试验结果表明了该方法的有效性和系统的鲁棒性。 相似文献
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神经网络模型参考自适应控制及其在带材板形控制系统中的应用 总被引:5,自引:0,他引:5
通过对某轧机液压弯辊系统特性的分析,提出了神经网络模型参考自适应控制策略,兼顾了系统的动态特性和静态特性,成功地解决了未知、不确定、非线性系统的辨识与控制问题;并将其用于液压弯辊系统仿真,结果表明该系统的性能良好,将会明显提高产品质量。 相似文献
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半主动直接输出反馈变结构控制电流变阻尼器减振研究 总被引:1,自引:0,他引:1
针对多层结构电流变阻尼器减振系统运动状态难以完全实时测量、扰动存在不确定性、系统参数容易出现摄动以及阻尼器连续可调的特点,提出了半主动直接输出反馈变结构控制策略,根据滑模运动方程稳定的Hurwitz判据选择滑模梯度参数,实现控制与扰动完全解耦;饱和非线性环节使阻尼器阻尼力不超调;阻尼力对主结构做负功控制规则保证主结构最佳减振。仿真分析表明,电流变阻尼器减振控制系统效果明显,不仅对扰动具有自适应性,而且对系统参数摄动也具有很强的鲁棒性。 相似文献
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FUZZY GLOBAL SLIDING MODE CONTROL BASED ON GENETIC ALGORITHM AND ITS APPLICATION FOR FLIGHT SIMULATOR SERVO SYSTEM 总被引:4,自引:0,他引:4
LIU Jinkun School of Automation Science & Electrical Engineering Beihang University Beijing China HE Yuzhu Department of System Engineering of Engineering Technology Beihang University B eijing China 《机械工程学报(英文版)》2007,20(3):13-17
To alleviate the chattering problem, a new type of fuzzy global sliding mode controller (FGSMC) is presented. In this controller, the switching gain is estimated by fuzzy logic system based on the reachable conditions of sliding mode controller(SMC), and genetic algorithm (GA) is used to optimize scaling factor of the switching gain, thus the switch chattering of SMC can be alleviated. Moreover, global sliding mode is realized by designing an exponential dynamic sliding surface. Simulation and real-time application for flight simulator servo system with Lugre friction are given to indicate that the proposed controller can guarantee high robust performance all the time and can alleviate chattering phenomenon effectively. 相似文献
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整车非线性系统的输入输出解耦及解耦比例微分控制 总被引:1,自引:1,他引:1
根据非线性解耦控制理论设计出解耦控制器,以消除装有主动悬架(ASS)和电动助力转向(EPS)的集成控制器中控制通道的耦合和路面不平度的干扰.为进一步减少响应时间和跟踪误差并降低超调量,在解耦控制器的基础上,设计出动态响应较为理想的解耦比例微分(PD)控制器.仿真结果表明,基于解耦控制的ASS EPS集成系统,与未集成的ASS或EPS系统相比,前者能更好地改善汽车动力学特性.此外,解耦PD控制与单独的解耦控制相比,在改善整车的行驶平顺性和操纵稳定性等方面效果也更为明显.为验证理论分析和仿真计算的正确性,进行实车道路试验,试验采用自行设计的ASS EPS集成控制系统,试验结果与仿真计算结果基本吻合,进一步验证了所提方法是正确有效的. 相似文献
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