应用调谐质量阻尼器(tuned mass damper, TMD)改善某摩托车手把振动。建立了用于手把减振研究的整车有限元模型,通过振动台架试验验证发动机激励下所建模型的可行性。提出了一种符合TMD安装方式的嵌入式TMD振动模型,以手把第一阶振动模...应用调谐质量阻尼器(tuned mass damper, TMD)改善某摩托车手把振动。建立了用于手把减振研究的整车有限元模型,通过振动台架试验验证发动机激励下所建模型的可行性。提出了一种符合TMD安装方式的嵌入式TMD振动模型,以手把第一阶振动模态频率为TMD调谐频率,以抑制手把振动加速度响应为目标,结合Den Hartog定点理论和等价质量识别法确定了嵌入式TMD最优减振设计参数值。通过发动机激励下的手把振动响应分析表明:所设计TMD对手把振动有显著抑制效果,其总加权加速度均方根值减小了37.8%。展开更多
Since the dynamical system and control system of the missile are typically nonlinear, an effective acceleration tracking autopilot is designed using the dynamic surface control(DSC)technique in order to make the missi...Since the dynamical system and control system of the missile are typically nonlinear, an effective acceleration tracking autopilot is designed using the dynamic surface control(DSC)technique in order to make the missile control system more robust despite the uncertainty of the dynamical parameters and the presence of disturbances. Firstly, the nonlinear mathematical model of the tail-controlled missile is decomposed into slow acceleration dynamics and fast pitch rate dynamics based on the naturally existing time scale separation. Secondly, the controller based on DSC is designed after obtaining the linear dynamics characteristics of the slow and fast subsystems. An extended state observer is used to detect the uncertainty of the system state variables and aerodynamic parameters to achieve the compensation of the control law. The closed-loop stability of the controller is derived and rigorously analyzed. Finally, the effectiveness and robustness of the design is verified by Monte Carlo simulation considering different initial conditions and parameter uptake. Simulation results illustrate that the missile autopilot based DSC controller achieves better performance and robustness than the other two well-known autopilots.The method proposed in this paper is applied to the design of a missile autopilot, and the results show that the acceleration tracking autopilot based on the DSC controller can ensure accurate tracking of the required commands and has better performance.展开更多
文摘应用调谐质量阻尼器(tuned mass damper, TMD)改善某摩托车手把振动。建立了用于手把减振研究的整车有限元模型,通过振动台架试验验证发动机激励下所建模型的可行性。提出了一种符合TMD安装方式的嵌入式TMD振动模型,以手把第一阶振动模态频率为TMD调谐频率,以抑制手把振动加速度响应为目标,结合Den Hartog定点理论和等价质量识别法确定了嵌入式TMD最优减振设计参数值。通过发动机激励下的手把振动响应分析表明:所设计TMD对手把振动有显著抑制效果,其总加权加速度均方根值减小了37.8%。
基金supported by Joint Fund of the Ministry of Education f or Equipment Pre-research (6141A20223)。
文摘Since the dynamical system and control system of the missile are typically nonlinear, an effective acceleration tracking autopilot is designed using the dynamic surface control(DSC)technique in order to make the missile control system more robust despite the uncertainty of the dynamical parameters and the presence of disturbances. Firstly, the nonlinear mathematical model of the tail-controlled missile is decomposed into slow acceleration dynamics and fast pitch rate dynamics based on the naturally existing time scale separation. Secondly, the controller based on DSC is designed after obtaining the linear dynamics characteristics of the slow and fast subsystems. An extended state observer is used to detect the uncertainty of the system state variables and aerodynamic parameters to achieve the compensation of the control law. The closed-loop stability of the controller is derived and rigorously analyzed. Finally, the effectiveness and robustness of the design is verified by Monte Carlo simulation considering different initial conditions and parameter uptake. Simulation results illustrate that the missile autopilot based DSC controller achieves better performance and robustness than the other two well-known autopilots.The method proposed in this paper is applied to the design of a missile autopilot, and the results show that the acceleration tracking autopilot based on the DSC controller can ensure accurate tracking of the required commands and has better performance.
