共查询到20条相似文献，搜索用时 218 毫秒
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针对水轮机调节系统的非线性特性和"水锤"效应,结合人工蜂群算法(ABC)搜索过程精细、全局收敛性较强的特点,提出一种改进模糊人工蜂群算法(MFABC),将其应用于不同扰动工况下的水轮机调节系统中,并利用Matlab强大的仿真能力完成水轮机调节系统参数的优化。通过仿真实验,验证了所提出的MFABC算法较Ziegler Nichols算法、模糊PID算法、粒子群算法和标准ABC算法在全局搜索能力和收敛速度方面的有效性和优越性,保证该方案下系统能获得更好的动态性能。该仿真实验既可加深学生对水轮机调速器参数优化问题的认识与理解,也有利于提高学生的实验仿真能力。 相似文献
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《实验室研究与探索》2015,(12):21-24
针对水轮机调节系统结构复杂、难以控制等问题,在传统PID控制的基础上,运用模糊理论提出了基于模糊自适应PID控制的水轮机调速器参数整定方案,以实现对系统进行实时、在线控制。在水轮机调节系统数学模型的基础上,根据PID 3个参数分别对系统性能产生的影响,完成了模糊自适应PID控制器的设计与Matlab环境下的程序编写。在系统处于不同频率扰动下,分别采用提出的模糊自适应控制方案和Ziegler Nichols算法进行仿真实验。结果表明,提出的模糊自适应控制方案是一种有效的水轮机调速器参数整定方法,相比Ziegler Nichols算法,该方案控制下的系统能获得更好的动态性能。 相似文献
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袁地 《安阳师范学院学报》2009,(2)
构造了一个不同于Lorenz系统、Chen系统和Lu系统的三维连续自治混沌系统.利用非线性动力学的方法,通过理论推导、数值仿真、Lyapunov指数谱、分叉图、相图、Poincare截面图和功率谱研究了这个类Lorenz混沌系统的基本动力学特性,并分析了系统在不同参数时复杂的动力学现象,结果表明,该系统具有丰富的动力学行为. 相似文献
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针对典型电液伺服控制系统非线性、参数时变的特点,常规PID控制无法满足控制性能要求．文中提出将小脑模型（CMAC）神经网络和PID相结合的控制策略．仿真结果表明,经过CMAC神经网络对常规PID控制器的输出不断在线学习,系统能够有效抑制扰动,并具有实时性好,输出误差小,鲁棒性强等优点．在系统参数变化,外界扰动的影响下,其控制性能得到明显提高． 相似文献
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本文研究了非线性铰支直杆在轴向周期力扰动下的的响应问题,求出了相空间中其同宿轨道、异宿轨道和次谐轨道的参数方程,给出了分叉种类和物理参数的关系以及杆发生和未发生线性失稳时出现同宿分叉、异宿分叉和次谐分叉的条件. 相似文献
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利用分段光滑开关模型,通过MATLAB中simulink搭建模型并采用龙格-库塔（ Runge-Kutia ）算法,得到了电流模式Boost变换器的时域波形图及相图;利用精确离散迭代数学模型,通过MATLAB中M文件编程,得到了电流模式Boost变换器的庞加莱映射图及分叉图。在电流模式Boost变换器中选择不同的参考电流数值,采用这两种模型对不同的参考电流值进行仿真,两种仿真模型的工作状态是相同的,分别证明了电流模式Boost变换器中具有丰富的分叉与混沌现象,也就是非线性现象。 相似文献
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Based on convolution-type constitutive equations for linear viscoelastic materials with damage and the hypotheses of Timoshenko beams with large deflections, the nonlinear equations governing dynamical behavior of Timoshenko beams with damage on viscoelastic foundation were firstly derived. By using the Galerkin method in spatial domain, the nonlinear integro-partial differential equations were transformed into a set of integro-ordinary differential equations. The numerical methods in nonlinear dynamical systems, such as the phase-trajectory diagram, Poincare section and bifurcation figure, were used to solve the simplified systems of equations. It could be seen that simplified dynamical systems possess the plenty of nonlinear dynamical properties. The influence of load and material parameters on the dynamic behavior of nonlinear system were investigated in detail. 相似文献
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Dynamical Behavior of Nonlinear Viscoelastic Timoshenko Beams with Damage on a Viscoelastic Foundation 总被引：2，自引：0，他引：2
Based on convolution-type constitutive equations for linear viscoelastic materials with damage and the hypotheses of Timoshenko beams with large deflections, the nonlinear equations governing dynamical behavior of Timoshenko beams with damage on viscoelastic foundation were firstly derived. By using the Galerkin method in spatial domain, the nonlinear integro-partial differential equations were transformed into a set of integro-ordinary differential equations. The numerical methods in nonlinear dynamical systems, such as the phase-trajectory diagram, Poincare section and bifurcation figure, were used to solve the simplified systems of equations. It could be seen that simplified dynamical systems possess the plenty of nonlinear dynamical properties. The influence of load and material parameters on the dynamic behavior of nonlinear system were investigated in detail. 相似文献
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一类新超混沌系统及其自同步 总被引：2，自引：0，他引：2
高智中 《常熟理工学院学报》2011,25(8):31-34
基于一个三维混沌系统构造了一个新的四维超混沌系统,利用系统的分岔图、Lyapunov指数谱图和相图分析方法研究了该系统的运动规律．根据线性系统稳定性定理,设计了一种非线性反馈控制器,实现了该超混沌系统的自同步,数值模拟结果验证了理论分析的正确性． 相似文献
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Rotor systems supported by angular contact ball bearings are complicated due to nonlinear Hertzian contact force. In this paper, nonlinear bearing forces of ball bearing under five-dimensional loads are given, and 5-DOF dynamic equations of a rigid rotor ball bearing system are established. Continuation-shooting algorithm for periodic solutions of the nonlinear non-autonomous dynamic system and Floquet multipliers of the system are used. Furthermore, the bifurcation and stability of the periodic motion of the system in different parametric domains are also studied. Results show that the bifurcation and stability of period-1 motion vary with structural parameters and operating parameters of the rigid rotor ball bearing system. Avoidance of unbalanced force and bending moment, appropriate initial contact angle, axial load and damping factor help enhance the unstable rotating speed of period-1 motion. 相似文献
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一类新的混沌系统及其混沌控制 总被引：1，自引：0，他引：1
构造了一个新的三维自治混沌系统,该系统含有四个参数,三个非线性项.通过理论分析和相轨迹图、分岔图、Lyapunov指数谱等非线性动力学分析方法研究了系统的非线性动力学行为.最后运用线性反馈控制法对新混沌系统进行控制,将混沌轨道控制到稳定的周期轨道,并给出了数值仿真结果,证实了所设计的线性反馈控制器的有效性. 相似文献
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嵌岩桩非线性动力学特性 总被引：1，自引：0，他引：1
The nonlinear dynamic characteristics of a pile embedded in a rock were investigated. Suppose that both the materials of the pile and the soil around the pile obey nonlinear elastic and linear viscoelastic constitutive relations. The nonlinear partial differential equation governing the dynamic characteristics of the pile was first derived. The Galerkin method was used to simplify the equation and to obtain a nonlinear ordinary differential equation. The methods in nonlinear dynamics were employed to solve the simplified dynamical system, and the time-path curves, phase-trajectory diagrams, power spectrum, Poincare sections and bifurcation and chaos diagrams of the motion of the pile were obtained. The effects of parameters on the dynamic characteristics of the system were also considered in detail. 相似文献
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引入二次多项式平方轮胎模型,选取合适的状态变量,建立了四轮转向汽车四维非线性动力学系统,应用中心流形定理对其进行了降维处理并转换为中心流形上的一阶约化系统.应用非线性分岔和稳定性理论对均匀路面工况的稳定性进行了分析,并在Matlab/Simulink中进行了仿真.结果表明：随着车速和前轮转角的增加,高维四轮转向汽车奇异点处会发生鞍结分岔,该分岔会导致汽车失稳. 相似文献
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对固相振荡燃烧模型所研究的化学现象进行了非线性动力学分析,将线性反馈控制方法应用到化学反应模型中。通过数值仿真,系统的相图、状态历程图、全局分岔图均表明：不断的调整控制参数,该方法能将此系统控制到稳定的周期轨道。 相似文献
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该文数值计算了两类连续混沌方程的分岔图、李氏指数谱,同时模拟仿真了这两类混沌系统的混沌吸引子,并以此为基础通过数值模拟讨论了第三类连续微分方程的混沌动力学行为,得到了相应的混沌吸引子. 相似文献