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Application of Wavelet Transform to Acoustic Radiation and Scattering

Wen Lihua,Ren Xingmin

Strategic Study of CAE 2002, Volume 4, Issue 8,   Pages 63-68

Abstract:

Traditional boundary element methods with a full matrix equation for acoustic problems, have beenIn this paper, the new wavelet approaches have been presented for solving acoustic radiation and scattering, and structural-acoustic coupling.a basis of the orthogonal wavelets on the interval, and a wavelet spectral formulation for solving acousticThe new technique was employed to investigate the underwater acoustic radiation from a complicate structure

Keywords： wavelet analysis     acoustic radiation and scattering     structural-acoustic coupling     frequency iteration    

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A novel structural modification to eliminate the early coupling between bending and torsional mode shapes

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 131-142 doi: 10.1007/s11709-016-0376-4

Abstract: In this paper, a novel structural modification approach has been adopted to eliminate the early couplingto obtain the natural frequencies of the first eight mode shapes of vibrations before and after the structuralthe deck to analyze both the bending and the torsional stiffness of the system before and after the structuralFurthermore, the coupling between the vertical and torsional mode shapes has been removed to larger naturalThe novel structural approach manifested great efficiency in increasing vertical and torsional stiffness

Keywords： aeroelastic instability     structural damping     flutter wind speed     bending stiffness     torsional stiffness    

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Acoustic analysis of lightweight auto-body based on finite element method and boundary element method

LIANG Xinhua, ZHU Ping, LIN Zhongqin, ZHANG Yan

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 99-103 doi: 10.1007/s11465-007-0017-7

Abstract: The pressure response of the interior acoustic domain is solved by a boundary element method (BEM).To find the most contributing panel to the inner sound pressure, the panel acoustic contribution analysisFinally, the most contributing panel is located and the resulting structural optimization is found to

Keywords： harshness     automotive prototype     structural optimization     vibration     efficient    

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Augmentation of natural convective heat transfer by acoustic cavitation

Jun CAI, Xiulan HUAI, Shiqiang LIANG, Xunfeng LI,

Frontiers in Energy 2010, Volume 4, Issue 3,   Pages 313-318 doi: 10.1007/s11708-009-0064-3

Abstract: An experimental study was conducted to investigate the effects of acoustic cavitation on natural convectiveThe experimental results indicated that heat transfer could be enhanced by acoustic cavitation and had

Keywords： heat transfer enhancement     augmentation     acoustic cavitation     acoustic streaming     convective heat transfer    

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Acoustic fault signal extraction via the line-defect phononic crystals

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 1,   Pages 10-10 doi: 10.1007/s11465-021-0666-y

Abstract: The defect band, namely, the formed resonance band of line-defect PCs enables the incident acoustic wave

Keywords： phononic crystals     line-defect     fault signal extraction     acoustic enhancement    

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Experimental study on wire breakage detection by acoustic emission

Limin SUN, Ji QIAN

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4,   Pages 503-509 doi: 10.1007/s11709-011-0132-8

Abstract: This paper experimentally investigated wire breakage detection in a steel cable by acoustic emission

Keywords： acoustic emission (AE)     waveform     wire breakage     attenuation factor     wave velocity    

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Simulation and experimental improvement on a small-scale Stirling thermo-acoustic engine

Mao CHEN,Yonglin JU

Frontiers in Energy 2016, Volume 10, Issue 1,   Pages 37-45 doi: 10.1007/s11708-015-0390-6

Abstract: Compared with the traditional engines, the thermo-acoustic engines are relatively new and can act asIn this paper, the influence of the dimensions of the main parts of the small-scale Stirling thermo-acousticBased on the numerical simulation, a small-scale Stirling thermo-acoustic engine were constructed and

Keywords： thermo-acoustic Stirling engine     small-scale     simulation     experiment    

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Acoustic characteristics of bi-directional turbines for thermoacoustic generators

Dongdong LIU, Yanyan CHEN, Wei DAI, Ercang LUO

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 1027-1036 doi: 10.1007/s11708-020-0702-3

Abstract: A general expression for the acoustic characteristics of the bi-directional turbine was proposed basedThe turbine in the oscillating flow was treated in a lumped-parameter model to extract the acoustic impedanceThe key acoustic impedance characteristic of the turbine was the resistance and inertance due to complexcharacteristics are valid for describing the bi-directional turbine, providing the basis for optimization of the coupling

Keywords： thermoacoustic power generator     acoustic characteristics     bi-directional impulse turbine     energy conversion    

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Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 62-67 doi: 10.1007/s11465-007-0010-1

Abstract: Acoustic-structure sensitivity is used to predict the change of acoustic pressure when a structure designand response velocity sensitivity with respect to structure design variable were carried out by using structuralFEM, the acoustic response and acoustic pressure sensitivity with respect to structure velocity werecarried out by using acoustic BEM.Then, acoustic-structure sensitivity was computed by linking velocity sensitivity in FEM and acoustic

Keywords： sensitivity method     BEM     acoustic pressure     pressure sensitivity     frequency    

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Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete

Frontiers of Structural and Civil Engineering   Pages 1341-1356 doi: 10.1007/s11709-023-0988-4

Abstract: The dynamic splitting tensile damage characteristics were evaluated using acoustic emission (AE) parameter

Keywords： steel fiber reinforced concrete     freeze–thaw cycling     Brazilian disc splitting test     acoustic emissiontechnique     dynamic splitting tensile acoustic emission properties    

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evolution behavior of polypropylene fiber reinforced concrete subjected to sulfate attack based on acoustic

Ninghui LIANG; Jinwang MAO; Ru YAN; Xinrong LIU; Xiaohan ZHOU

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3,   Pages 316-328 doi: 10.1007/s11709-022-0810-8

Abstract: reinforced concrete (PFRC) subjected to sulfate attack, a uniaxial compression test was carried out based on acoustic

Keywords： polypropylene fiber reinforced concrete     sulfate attack     damage evolution behavior     acoustic emission    

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Accumulated damage process of thermal sprayed coating under rolling contact by acoustic emission technique

Jia XU,Zhen-yu ZHOU,Zhong-yu PIAO

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 3,   Pages 227-232 doi: 10.1007/s11465-016-0395-9

Abstract: Acoustic emission (AE) technique was introduced to monitor the RCF process of the coatings.

Keywords： accumulated damage     spray coating     rolling contact fatigue     acoustic emission    

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Perspective: Acoustic Metamaterials in Future Engineering Perspective

Qiangbing Lu, Xin Li, Xiujuan Zhang, Minghui Lu, Yanfeng Chen

Engineering 2022, Volume 17, Issue 10,   Pages 22-30 doi: 10.1016/j.eng.2022.04.020

Abstract:

Acoustic metamaterials (AMMs) are a type of artificial materials thatmake use of appropriate structural designs and exhibit exotic properties not found in natural materialson their future engineering, especially in the most promising fields of sound absorption/isolation, acoustic

Keywords： Acoustic metamaterials     Sound absorption/isolation     Acoustic imaging     Engineering application    

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Fatigue features study on the crankshaft material of 42CrMo steel using acoustic emission

Yue SHI,Lihong DONG,Haidou WANG,Guolu LI,Shenshui LIU

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 3,   Pages 233-241 doi: 10.1007/s11465-016-0400-3

Abstract: In this paper, acoustic emission (AE) technology and machine vision are used to monitor the four-point

Keywords： acoustic emission     fatigue failure     remanufacturing crankshaft     wavelet analysis    

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Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 146-150 doi: 10.1007/s11465-006-0013-3

Abstract: It is important to analyze the propagation characteristics of guided waves in acoustic leak locationIn this paper, the acoustic leak signal is analyzed in the time-frequency domain.Based on the relation of time-frequency distribution of the acoustic leak signal and the dispersion curvesof guided waves, the mode components of acoustic leak signals were obtained.

Keywords： dispersion     selection     guided     research     time-frequency    

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Title Author Date Type Operation

Application of Wavelet Transform to Acoustic Radiation and Scattering

Wen Lihua,Ren Xingmin

Journal Article

A novel structural modification to eliminate the early coupling between bending and torsional mode shapes

Nazim Abdul NARIMAN

Journal Article

Acoustic analysis of lightweight auto-body based on finite element method and boundary element method

LIANG Xinhua, ZHU Ping, LIN Zhongqin, ZHANG Yan

Journal Article

Augmentation of natural convective heat transfer by acoustic cavitation

Jun CAI, Xiulan HUAI, Shiqiang LIANG, Xunfeng LI,

Journal Article

Acoustic fault signal extraction via the line-defect phononic crystals

Journal Article

Experimental study on wire breakage detection by acoustic emission

Limin SUN, Ji QIAN

Journal Article

Simulation and experimental improvement on a small-scale Stirling thermo-acoustic engine

Mao CHEN,Yonglin JU

Journal Article

Acoustic characteristics of bi-directional turbines for thermoacoustic generators

Dongdong LIU, Yanyan CHEN, Wei DAI, Ercang LUO

Journal Article

Research on acoustic-structure sensitivity using FEM and BEM

ZHANG Jun, ZHAO Wenzhong, ZHANG Weiying

Journal Article

Acoustic emissions evaluation of the dynamic splitting tensile properties of steel fiber reinforced concrete

Journal Article

evolution behavior of polypropylene fiber reinforced concrete subjected to sulfate attack based on acoustic

Ninghui LIANG; Jinwang MAO; Ru YAN; Xinrong LIU; Xiaohan ZHOU

Journal Article

Accumulated damage process of thermal sprayed coating under rolling contact by acoustic emission technique

Jia XU,Zhen-yu ZHOU,Zhong-yu PIAO

Journal Article

Perspective: Acoustic Metamaterials in Future Engineering

Qiangbing Lu, Xin Li, Xiujuan Zhang, Minghui Lu, Yanfeng Chen

Journal Article

Fatigue features study on the crankshaft material of 42CrMo steel using acoustic emission

Yue SHI,Lihong DONG,Haidou WANG,Guolu LI,Shenshui LIU

Journal Article

Modal analysis of acoustic leak signal in pipelines using time-frequency analysis

JIAO Jing-pin, FEI Ren-yuan, HE Cun-fu, WU Bin

Journal Article