Enhancement effect of cumulative second-harmonic generation by closed propagation feature of circumferential guided waves  

作　　者：Guang-Jian Gao Ming-Xi Deng Ning Hu Yan-Xun Xiang 高广健;邓明晰;胡宁;项延训(Department of Physics,Army Logistics University,Chongqing 401331,China;College of Aerospace Engineering,Chongqing University,Chongqing 400044,China;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]Department of Physics,Army Logistics University,Chongqing 401331,China [2]College of Aerospace Engineering,Chongqing University,Chongqing 400044,China [3]School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Chinese Physics B》2020年第2期301-308,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11834008,11704410,11632004,11474361,and U1930202).

摘　　要：On the basis of second-order perturbation approximate and modal expansion approach,we investigate the enhancement effect of cumulative second-harmonic generation(SHG)of circumferential guided waves(CGWs)in a circular tube,which is inherently induced by the closed propagation feature of CGWs.An appropriate mode pair of primary-and double-frequency CGWs satisfying the phase velocity matching and nonzero energy flux is selected to ensure that the second harmonic generated by primary CGW propagation can accumulate along the circumference.Using a coherent superposition of multi-waves,a model of unidirectional CGW propagation is established for analyzing the enhancement effect of cumulative SHG of primary CGW mode selected.The theoretical analyses and numerical simulations performed directly demonstrate that the second harmonic generated does have a cumulative effect along the circumferential direction and the closed propagation feature of CGWs does enhance the magnitude of cumulative second harmonic generated.Potential applications of the enhancement effect of cumulative SHG of CGWs are considered and discussed.The theoretical analysis and numerical simulation perspective presented here yield an insight previously unavailable into the physical mechanism of the enhancement effect of cumulative SHG by closed propagation feature of CGWs in a circular tube.On the basis of second-order perturbation approximate and modal expansion approach,we investigate the enhancement effect of cumulative second-harmonic generation(SHG) of circumferential guided waves(CGWs) in a circular tube,which is inherently induced by the closed propagation feature of CGWs.An appropriate mode pair of primary-and doublefrequency CGWs satisfying the phase velocity matching and nonzero energy flux is selected to ensure that the second harmonic generated by primary CGW propagation can accumulate along the circumference.Using a coherent superposition of multi-waves,a model of unidirectional CGW propagation is established for analyzing the enhancement effect of cumulative SHG of primary CGW mode selected.The theoretical analyses and numerical simulations performed directly demonstrate that the second harmonic generated does have a cumulative effect along the circumferential direction and the closed propagation feature of CGWs does enhance the magnitude of cumulative second harmonic generated.Potential applications of the enhancement effect of cumulative SHG of CGWs are considered and discussed.The theoretical analysis and numerical simulation perspective presented here yield an insight previously unavailable into the physical mechanism of the enhancement effect of cumulative SHG by closed propagation feature of CGWs in a circular tube.

关 键 词：CIRCUMFERENTIAL guided wave second-harmonic generation(SHG) enhancement effect of CUMULATIVE SHG CLOSED PROPAGATION FEATURE 

分 类 号：TN814[电子电信—信息与通信工程]