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Equivalent stochastic linearization (ESL) for nonlinear uncertain structure under stationary stochastic excitation is presented. There are two parts of difference between the original system and equivalent system: one is caused by the difference between the means of original and equivalent stochastic structure; and another is caused by the difference between the original and equivalent stochastic structure which has the relation with stochastic variables. Statistical characteristics of equivalent stochastic structure can be obtained in accordance with mean square criterion, so nonlinear stochastic structure is transformed into linear stochastic structure. In order to attain that objective, the compound response spectrum of linear stochastic structure under stationary random excitation which is used in the solution is derived in the case of the mutual independence between stochastic excitation and stochastic structure. Finally, the example shows the accuracy and validity of the proposed method. 相似文献
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受电弓/接触网系统动力学模型及特性 总被引:13,自引:2,他引:13
针对中国提速铁路采用的 CH1 60 - 0简单链型悬挂接触网及 SS7受电弓 ,建立接触网的有限元模型 ,计算得出固有频率及相应的模态振型 ,导出其振动方程 ,并推导出受电弓非线性模型的运动微分方程 ,利用泰勒级数展开对非线性模型进行线性化 ,得到受电弓框架的等效参数 ,最后在这个基础上建立起受电弓 /接触网垂向耦合动力学模型。应用受电弓的线性模型及非线性模型 ,而且考虑机车、轨道激扰因素影响下 ,对接触网 /受电弓系统的动态进行了运行模拟计算并加以比较。 相似文献
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以非增压柴油机为研究对象建立了柴油机调速的非线性模型,实验验证非线性模型的精度达到95%,以此模型为研究对象,采取了非线性系统的反馈线性化方法进行调速控制器的设计,对控制器进行的计算分析可知,控制器的确保相位裕量达到了60°,对控制系统的仿真计算表明其瞬态调速率达到9%,响应时间为4s. 相似文献
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基于反馈线性化与闭环增益成形的减摇鳍控制 总被引:4,自引:1,他引:3
根据减摇鳍系统的非线性数学模型,设计了一种具有鲁棒性的非线性控制器。通过采用精确反馈线性化方法将减摇鳍系统的非线性模型线性化,然后用闭环增益成形算法设计出非线性鲁棒控制器。用Matlab的Simulink工具箱分别对相同海况下未进行减摇控制、已设定航速及航速减半状态时采用减摇鳍控制的非线性数学模型进行仿真。仿真结果表明,该控制策略对于减摇鳍非线性控制系统是十分有效的,特别是鲁棒性能令人满意。算法的设计过程简单,物理意义明显。 相似文献
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考虑阻尼力矩和恢复力矩的非线性,运用能量法对正横规则波中船舶非线性横摇运动方程进行等效线性化,导出等效线性系数表达式,并验证其工程实用性,为船舶横摇预报提供理论分析计算模型。 相似文献
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A zero-speed fin stabilizer system was developed for rolling control of a marine robot.As a robot steering device near the sea surface with low speed,it will have rolling motion due to disturbance from waves.Based on the working principle of a zero-speed fin stabilizer and a marine robot’s dynamic properties,a roll damping controller was designed with a master-slave structure.It was composed of a sliding mode controller and an output tracking controller that calculates the desired righting moment and drives the zero-speed fin stabilizer.The methods of input-output linearization and model reference were used to realize the tracking control.Simulations were presented to demonstrate the validity of the control law proposed. 相似文献
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非线性液压阻尼悬架的优化设计及最优控制 总被引:7,自引:1,他引:7
本文对二自由度非线液压阻尼悬架系统进行了统计线性分析,并提出这种半主动非线性液压阻尼悬架系统针对不同路况进行最优控制的控制策略;同时对非线性阻尼系统进行实时仿真,得出此类液压阻尼对振动的抑制优于线性阻尼的结论。 相似文献
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在移动通讯领域内,线性功率放大器的高线性度是保障通讯信息无失真传播的重要因素。本文基于前馈线性放大器的原理,利用数字自适应控制算法,实现了功率放大器的高线性度。实验数据表明这种方法取得良好的控制效果。 相似文献