基于ANSYS的舰船桅杆振动半主动神经网络控制仿真
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摘要
舰船桅杆在风载、船舶横摇惯性载荷以及由螺旋桨引起的桅杆基础加速度激励等载荷作用下,其顶部雷达处会产生较大的转角振动,严重影响雷达追踪的分辨率。文中以磁流变液阻尼器(Magneto-Rheological Damper)为作动器,采用神经网络模拟该阻尼器的逆向动特性,并运用独立模态空间控制算法设计了半主动控制系统。研究了基于ANSYS平台的振动半主动控制实现方法,并最终在ANSYS中实现了基于磁流变阻尼器的舰船桅杆振动半主动控制。数值计算结果表明,文中设计的控制系统能有效地减小桅杆顶部雷达的转角振动,基于ANSYS实现结构振动控制仿真是可行的。
The rotational vibrations at the top of mast,which may be due to wind loading,inertial loading from ship rolling and base excitations induced by the running propeller often cause serious deterioration in radar-tracking resolution.In this paper,a method of semi-active vibration control using magneto-rheological(MR) dampers to reduce the rotational vibration of the mast is presented.ANSYS based simulation method of vibration control is proposed and ANSYS parametric design language is employed to code simulation calculation of vibration control.In this study,the independent modal space control algorithm is used for the vibration control.As the phenomenological model of an MR damper is highly nonlinear,which is difficult to analyse,a back-propagation neural network is trained to emulate the inverse dynamic characteristics of the MR damper in the analysis.Numerical simulations show that the proposed control methods can effectively suppress the rotational vibrations at the top of ship mast,and the simulation method of vibration control based on ANSYS is feasible.
The rotational vibrations at the top of mast,which may be due to wind loading,inertial loading from ship rolling and base excitations induced by the running propeller often cause serious deterioration in radar-tracking resolution.In this paper,a method of semi-active vibration control using magneto-rheological(MR) dampers to reduce the rotational vibration of the mast is presented.ANSYS based simulation method of vibration control is proposed and ANSYS parametric design language is employed to code simulation calculation of vibration control.In this study,the independent modal space control algorithm is used for the vibration control.As the phenomenological model of an MR damper is highly nonlinear,which is difficult to analyse,a back-propagation neural network is trained to emulate the inverse dynamic characteristics of the MR damper in the analysis.Numerical simulations show that the proposed control methods can effectively suppress the rotational vibrations at the top of ship mast,and the simulation method of vibration control based on ANSYS is feasible.
引文
[1]Hsueh Wen-Jeng,Lee Ya-Jung.Active vibration control on the mast of warships[J].International Shipbuilding Progress,1992,39(417):79-94.
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[3]李宏男,杨浩,李秀领.磁流变阻尼器参数化动力学模型的研究进展[J].大连理工大学学报,2004,44(4):616-624.
[4]隋莉莉,欧进萍.MR减振驱动器用于结构振动控制的算法研究[J].应用力学学报,2002,19(3):144-148.
[5]Spencer Jr B F,Dyke S J,Sain M K,et al.Phenomenological model for magneto-rheological dampers[J].Journal of Engineering Mechanics,1996,123(3):230-237.
[6]刘涛,杨凤鹏.精通ANSYS[M].北京:清华大学出版社,2002.
[7]星谷胜[日],常宝琦译.随机振动分析[M].北京:地震出版社,1977:43-61.
[8]Shinozuka M,Deodatis G.Simulation of stochastic processes by spectral representation[J].Applied Mechanics Review,1991,44:191-203.
[9]邹利军,金咸定.船舶上层建筑振动的最优控制分析[J].中国造船,1997,137(2):53-58.
[10]Dyke S J,Spencer Jr B F,Sain M K,et al.Modeling and control of magneto-rheological dampers for seismic response reduction[J].Smart Materials and Structures,1996,5:565-575.
[11]顾仲权,马扣根,陈卫东.振动主动控制(第一版)[M].北京:国防工业出版社,1997.
[2]Song T T,Reinhorn A M.Overview of active and hybrid structural control research in the U.S.[J].The Structure Dynamic Design of Tall Buildings,1993,2(1):192-209.
[3]李宏男,杨浩,李秀领.磁流变阻尼器参数化动力学模型的研究进展[J].大连理工大学学报,2004,44(4):616-624.
[4]隋莉莉,欧进萍.MR减振驱动器用于结构振动控制的算法研究[J].应用力学学报,2002,19(3):144-148.
[5]Spencer Jr B F,Dyke S J,Sain M K,et al.Phenomenological model for magneto-rheological dampers[J].Journal of Engineering Mechanics,1996,123(3):230-237.
[6]刘涛,杨凤鹏.精通ANSYS[M].北京:清华大学出版社,2002.
[7]星谷胜[日],常宝琦译.随机振动分析[M].北京:地震出版社,1977:43-61.
[8]Shinozuka M,Deodatis G.Simulation of stochastic processes by spectral representation[J].Applied Mechanics Review,1991,44:191-203.
[9]邹利军,金咸定.船舶上层建筑振动的最优控制分析[J].中国造船,1997,137(2):53-58.
[10]Dyke S J,Spencer Jr B F,Sain M K,et al.Modeling and control of magneto-rheological dampers for seismic response reduction[J].Smart Materials and Structures,1996,5:565-575.
[11]顾仲权,马扣根,陈卫东.振动主动控制(第一版)[M].北京:国防工业出版社,1997.
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