本文研究了新型惯质调谐质量阻尼器(novel tuned mass damper inerter,NTMDI)的安装方法对其优化设计与减振性能的影响。详细介绍了NTMDI-R(反向安装的NTMDI)的力学模型,并采用经典固定点理论对NTMDI-R进行了优化设计,得到了NTMDI-R最...本文研究了新型惯质调谐质量阻尼器(novel tuned mass damper inerter,NTMDI)的安装方法对其优化设计与减振性能的影响。详细介绍了NTMDI-R(反向安装的NTMDI)的力学模型,并采用经典固定点理论对NTMDI-R进行了优化设计,得到了NTMDI-R最优结构参数的解析式;对比研究了NTMDI-R与现有四种经典调谐质量阻尼器(TMD、TMDI、VTMD和NTMDI)在简谐激励和随机激励下的减振效果,并探究了安装方法对NTMDI-R减振性能的影响。结果表明:正、反向安装的两种减振器(NTMDI和NTMDI-R)优化参数不同,安装方法对其减振性能有较大影响。当表观质量比β小于0.1时,NTMDI-R的减振效果差于NTMDI;而β大于0.1时,NTMDI-R的减振效果与NTMDI基本一致,因此采用NTMDI进行结构减振应明确其安装方向。基础加速度和荷载力分别作用下,NTMDI-R的减振效果相对于NTMDI分别降低了3.9%和4.7%。展开更多
智能软开关(soft open point,SOP)能够提供实时潮流控制、故障快速自愈和馈线负载平衡,在配电网中得到了广泛应用。然而,电网电压暂降(grid voltage dips,GVD)是典型的大扰动工况,无法通过小信号方法分析配电网SOP在该工况下的稳定运行...智能软开关(soft open point,SOP)能够提供实时潮流控制、故障快速自愈和馈线负载平衡,在配电网中得到了广泛应用。然而,电网电压暂降(grid voltage dips,GVD)是典型的大扰动工况,无法通过小信号方法分析配电网SOP在该工况下的稳定运行机理。为此,采用混合势理论(mixed potential theory,MPT)研究了GVD工况下SOP的稳定性,并提出了增强SOP稳定性的参数优化策略和虚拟电容控制策略。首先,建立了SOP的非线性平均模型。在此基础上,利用MPT推导出SOP在GVD条件下的大信号稳定性判据(large signal stability criterion,LSSC)。此外,为了增强SOP系统的稳定性,基于LSSC提出了参数优化策略和构建虚拟电容的控制策略。最后,通过MATLAB/Simulink时域仿真验证了上述方法的有效性,即:1)基于LSSC可以有效地分析SOP在GVD下的稳定性;2)基于LSSC的系统参数优化策略和构建虚拟电容控制策略可以有效提高系统在大扰动条件下的稳定运行能力。展开更多
To solve the problem of providing the best initial situation for terminal guidance when multiple missiles intercept multiple targets,a group cooperative midcourse guidance law(GCMGL)considering time-to-go is proposed....To solve the problem of providing the best initial situation for terminal guidance when multiple missiles intercept multiple targets,a group cooperative midcourse guidance law(GCMGL)considering time-to-go is proposed.Firstly,a threedimensional(3D)guidance model is established and a cooperative trajectory shaping guidance law is given.Secondly,for estimating the unknown target maneuvering acceleration,an adaptive disturbance observer(ADO)is designed,combining finitetime theory with a radial basis function(RBF)neural network,and the convergence of the estimation error is proven using Lyapunov stability theory.Then,to ensure time-to-go cooperation among missiles within the same group and across different groups,the group consensus protocols of virtual collision point mean and the inter-group cooperative consensus protocol are designed respectively.Based on the group consensus protocols,the virtual collision point cooperative guidance law is given,and the finite-time convergence is proved by Lyapunov stability theory.Simultaneously,combined with trajectory shaping guidance law,virtual collision point cooperative guidance law and the intergroup cooperative consensus protocol,the design of GCMGL considering time-to-go is given.Finally,numerical simulation results show the effectiveness and the superiority of the proposed GCMGL.展开更多
文摘本文研究了新型惯质调谐质量阻尼器(novel tuned mass damper inerter,NTMDI)的安装方法对其优化设计与减振性能的影响。详细介绍了NTMDI-R(反向安装的NTMDI)的力学模型,并采用经典固定点理论对NTMDI-R进行了优化设计,得到了NTMDI-R最优结构参数的解析式;对比研究了NTMDI-R与现有四种经典调谐质量阻尼器(TMD、TMDI、VTMD和NTMDI)在简谐激励和随机激励下的减振效果,并探究了安装方法对NTMDI-R减振性能的影响。结果表明:正、反向安装的两种减振器(NTMDI和NTMDI-R)优化参数不同,安装方法对其减振性能有较大影响。当表观质量比β小于0.1时,NTMDI-R的减振效果差于NTMDI;而β大于0.1时,NTMDI-R的减振效果与NTMDI基本一致,因此采用NTMDI进行结构减振应明确其安装方向。基础加速度和荷载力分别作用下,NTMDI-R的减振效果相对于NTMDI分别降低了3.9%和4.7%。
文摘智能软开关(soft open point,SOP)能够提供实时潮流控制、故障快速自愈和馈线负载平衡,在配电网中得到了广泛应用。然而,电网电压暂降(grid voltage dips,GVD)是典型的大扰动工况,无法通过小信号方法分析配电网SOP在该工况下的稳定运行机理。为此,采用混合势理论(mixed potential theory,MPT)研究了GVD工况下SOP的稳定性,并提出了增强SOP稳定性的参数优化策略和虚拟电容控制策略。首先,建立了SOP的非线性平均模型。在此基础上,利用MPT推导出SOP在GVD条件下的大信号稳定性判据(large signal stability criterion,LSSC)。此外,为了增强SOP系统的稳定性,基于LSSC提出了参数优化策略和构建虚拟电容的控制策略。最后,通过MATLAB/Simulink时域仿真验证了上述方法的有效性,即:1)基于LSSC可以有效地分析SOP在GVD下的稳定性;2)基于LSSC的系统参数优化策略和构建虚拟电容控制策略可以有效提高系统在大扰动条件下的稳定运行能力。
基金supported by the National Natural Science Foundation of China(62003264).
文摘To solve the problem of providing the best initial situation for terminal guidance when multiple missiles intercept multiple targets,a group cooperative midcourse guidance law(GCMGL)considering time-to-go is proposed.Firstly,a threedimensional(3D)guidance model is established and a cooperative trajectory shaping guidance law is given.Secondly,for estimating the unknown target maneuvering acceleration,an adaptive disturbance observer(ADO)is designed,combining finitetime theory with a radial basis function(RBF)neural network,and the convergence of the estimation error is proven using Lyapunov stability theory.Then,to ensure time-to-go cooperation among missiles within the same group and across different groups,the group consensus protocols of virtual collision point mean and the inter-group cooperative consensus protocol are designed respectively.Based on the group consensus protocols,the virtual collision point cooperative guidance law is given,and the finite-time convergence is proved by Lyapunov stability theory.Simultaneously,combined with trajectory shaping guidance law,virtual collision point cooperative guidance law and the intergroup cooperative consensus protocol,the design of GCMGL considering time-to-go is given.Finally,numerical simulation results show the effectiveness and the superiority of the proposed GCMGL.
