基于非线性输出频率响应函数(Nonlinear Output Frequency Response Function,NOFRF),对引入了被动非线性消振器(Nonlinear Energy Sink,NES)的单自由度振动系统进行了分析,从频域分析的角度评价NES的振动抑制效果,对其进行动力学参数...基于非线性输出频率响应函数(Nonlinear Output Frequency Response Function,NOFRF),对引入了被动非线性消振器(Nonlinear Energy Sink,NES)的单自由度振动系统进行了分析,从频域分析的角度评价NES的振动抑制效果,对其进行动力学参数设计。首先,建立了引入NES的振动系统非线性动力学模型。然后,通过数值仿真,对单自由度系统进行了非线性输出频率响应函数分析和输出频率响应分析,从频域分析的角度解释了在原振动系统中引入NES对原系统固有频率几乎没有影响的原因。最后,通过分析NES各参数对振动抑制效果的影响,对NES进行了动力学参数设计。本文得出的分析结果对于工程领域中NES的设计具有非常重要的指导意义。展开更多
Parametric modeling of the impeller which drove a small wind device was built by knowledge fusion technology.NACA2410 airfoil blade was created by KF language.Using technology of UG/KF secondary development for the au...Parametric modeling of the impeller which drove a small wind device was built by knowledge fusion technology.NACA2410 airfoil blade was created by KF language.Using technology of UG/KF secondary development for the automatic modeling of wind turbine blade,the program can read in the airfoil data files automatically and the impeller model entity can be generated automatically.In order to modify the model,the aerodynamic characteristics of the impeller were analyzed for getting aerodynamic parameters by Fluent.The maximum force torch and best parameters of impeller were calculated.A physical prototype impeller was manufactured and the correctness of the design was verified,and the error of force torch between simulation and experimental results is about 10%.Parameterization design of the impeller model greatly improves the efficiency of modeling and flexibility of the CAD system.展开更多
文摘基于非线性输出频率响应函数(Nonlinear Output Frequency Response Function,NOFRF),对引入了被动非线性消振器(Nonlinear Energy Sink,NES)的单自由度振动系统进行了分析,从频域分析的角度评价NES的振动抑制效果,对其进行动力学参数设计。首先,建立了引入NES的振动系统非线性动力学模型。然后,通过数值仿真,对单自由度系统进行了非线性输出频率响应函数分析和输出频率响应分析,从频域分析的角度解释了在原振动系统中引入NES对原系统固有频率几乎没有影响的原因。最后,通过分析NES各参数对振动抑制效果的影响,对NES进行了动力学参数设计。本文得出的分析结果对于工程领域中NES的设计具有非常重要的指导意义。
基金Project(gjd-09041)supported by the Natural Science Foundation of Shanghai Municipal Education Commission,China
文摘Parametric modeling of the impeller which drove a small wind device was built by knowledge fusion technology.NACA2410 airfoil blade was created by KF language.Using technology of UG/KF secondary development for the automatic modeling of wind turbine blade,the program can read in the airfoil data files automatically and the impeller model entity can be generated automatically.In order to modify the model,the aerodynamic characteristics of the impeller were analyzed for getting aerodynamic parameters by Fluent.The maximum force torch and best parameters of impeller were calculated.A physical prototype impeller was manufactured and the correctness of the design was verified,and the error of force torch between simulation and experimental results is about 10%.Parameterization design of the impeller model greatly improves the efficiency of modeling and flexibility of the CAD system.
