抑制柱体结构涡激振动的非线性能量阱减振装置优化设计  

AN OPTIMUM DESIGN OF NONLINEAR ENERGY SINK VIBRATION ABSORBING DEVICE FOR SUPPRESSING VORTEX-INDUCED VIBRATION OF CYLINDRICAL STRUCTURES

作　　者：陈东阳 顾超杰 朱卫军 李迺璐 杨俊伟 芮筱亭[2] CHEN Dong-yang;GU Chao-jie;ZHU Wei-jun;LI Nai-lu;YANG Jun-wei;RUI Xiao-ting(College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou 225100,China;Institute of Launch Dynamics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]扬州大学电气与能源动力工程学院,江苏扬州225100 [2]南京理工大学发射动力学研究所,江苏南京210094

出　　处：《工程力学》2020年第9期240-247,共8页Engineering Mechanics

基　　金：江苏省自然科学基金项目(BK20190871);国家自然科学基金项目(11672261);江苏省研究生科研与实践创新计划项目(KYCX19_2104)。

摘　　要：为了抑制柱体结构的涡激振动(Vortex induced vibration,VIV)问题,该文基于Van der Pol尾流振子模型、结构动力学理论和优化算法,建立了非线性能量阱(Nonlinear energy sink,NES)减振装置优化设计仿真模型。采用Van der Pol尾流振子模型,将其与二维弹性支撑柱体结构动力学方程结合,建立二维弹性支撑柱体单自由度涡激振动预报模型,并与文献实验数据对比,验证了模型的准确性;在模型中嵌入NES控制模型,完成NES作用下的单自由度柱体VIV预测模型,并将其与优化算法相结合,通过优化算法改变非线性能量阱的参数,设计出对柱体涡激振动抑制效果满足设计要求的非线性能量阱;通过仿真分析优化后的NES结构参数对柱体涡激振动的抑制效果和机理。案例优化结果表明,在Ur=5.5时,NES作用下的柱体振幅减小了66.39%,减振效果明显。同时,该文采用优化方法获得的NES结构参数符合实际生产要求,确保了实物生产设计的可能性。To suppress the vortex-induced vibration(VIV)of a cylindrical structure,an optimal design simulation model of a nonlinear energy sink(NES)vibration-absorber is established based on Van der Pol wake oscillator model,structural dynamics and optimization algorithm.The Van der Pol wake oscillator model and the structural dynamic equation of a two-dimensional elastically supported cylinder are used to establish the model,which predicts one-degree-of-freedom VIV of a two-dimensional elastically supported cylinder.And the accuracy of the model is verified by comparing it with the reference’s experimental data.The nonlinear governing equations of motion with NES are embedded in the above model to modify the VIV model under the action of NES.Combining with an optimization algorithm which changes the parameters of the initial NES,nonlinear energy sink meeting design requirements are achieved.The effect and mechanism of the optimized NES parameters on suppression of the VIV are analyzed by a mount of simulations.The results of optimization case show that the amplitude of the cylinder under NES decreases by 66.39%,when Ur=5.5.The effect of vibration reduction is obvious.At the same time,the structure parameters of NES obtained by this optimization method meet requirements of actual production and ensure the possibility of physical production design.

关 键 词：涡激振动 非线性能量阱 Van der Pol尾流振子模型 遗传算法 优化设计 

分 类 号：O353.1[理学—流体力学]