| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Enhancement effect of cumulative second-harmonic generation by closed propagation feature of circumferential guided waves |
| Guang-Jian Gao(高广健)1, Ming-Xi Deng(邓明晰)2, Ning Hu(胡宁)2, Yan-Xun Xiang(项延训)3 |
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 |
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Abstract 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.
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Received: 08 November 2019
Revised: 11 December 2019
Accepted manuscript online:
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PACS:
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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43.25.+y
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(Nonlinear acoustics)
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43.20.Mv
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(Waveguides, wave propagation in tubes and ducts)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11834008, 11704410, 11632004, 11474361, and U1930202). |
Corresponding Authors:
Ming-Xi Deng, Yan-Xun Xiang
E-mail: dengmx65@yahoo.com;yxxiang@ecust.edu.cn
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Cite this article:
Guang-Jian Gao(高广健), Ming-Xi Deng(邓明晰), Ning Hu(胡宁), Yan-Xun Xiang(项延训) Enhancement effect of cumulative second-harmonic generation by closed propagation feature of circumferential guided waves 2020 Chin. Phys. B 29 024301
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