Analysis of wave motion in one-dimensional structures through fast-Fourier-transform-based wavelet finite element method

Shen, Wei; Li, Dongsheng; Zhang, Shuaifang; Ou, Jinping

doi:10.1016/j.jsv.2017.03.014

Cited by 37 publications

(24 citation statements)

References 33 publications

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“…Meanwhile, the composition optimization and more characterizations methods, i.e., high-resolution transmission electron microscopy (HRTEM) [22,23], resonance ultrasound spectroscopy [39][40][41], etc., will be attempted to better understand its microstructure. Table 1 Bath…”

Section: Discussionmentioning

confidence: 99%

Microstructure and properties of Cu-Sn-Zn-TiO2 nano-composite coatings on mild steel

Gao

Cao

Jin

et al. 2018

Surface and Coatings Technology

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Cu-Sn-Zn coatings have been widely used in industry for their unique properties, such as good conductivity, high corrosion resistance and excellent solderability. To further improve the mechanical performance of Cu-Sn-Zn coatings, powder-enhanced method was applied in the current study and Cu-Sn-Zn-TiO2 nanocomposite coatings with different TiO2 concentration were fabricated. The microstructure of Cu-Sn-Zn-TiO2 nano-composite coatings were investigated by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The mechanical properties of coatings including microhardness and wear resistance were studied. The results indicate that the incorporation of TiO2 nanoparticle can significantly influence the properties of Cu-Sn-Zn coatings. The microhardness of Cu-Sn-Zn coating was increased to 383 HV from 330 HV with 1g/L TiO2 addition. Also, the corrosion resistance of coating was enhanced. The effects of TiO2 nanoparticle concentration on the microstructure, mechanical properties and corrosion resistance of Cu-Sn-Zn-TiO2 nano-composite coatings were discussed.

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Section: Discussionmentioning

confidence: 99%

Microstructure and properties of Cu-Sn-Zn-TiO2 nano-composite coatings on mild steel

Gao

Cao

Jin

et al. 2018

Surface and Coatings Technology

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“…There have been many prior researches that used dispersive behavior of elastic waves for non-destructive evaluation (NDE) of various structural elements [11][12][13][14][15]. The IE test is an NDE method that uses dispersion of transient elastic waves for evaluation delamination defects in plate-like concrete structures.…”

Section: Theoretical Background Of Iementioning

confidence: 99%

Evaluation of Delamination in Concrete by IE Testing Using Multi-Channel Elastic Wave Data

Kee

Lee

Candelaria

2019

Sensors

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The main objectives of this study are to develop a non-destructive test method for evaluating delamination defects in concrete by the Impact-echo test using multi-channel elastic wave data and to verify the validity of the proposed method by experimental studies in the laboratory. First, prototype equipment using an eight-channel linear sensor array was developed to perform elastic wave measurements on the surface of the concrete. In this study, three concrete slab specimens (1500 mm (width) by 1500 mm (length) by 300 mm (thickness)), with simulated delamination defects of various lateral dimensions and depth, were designed and constructed in the laboratory. Multi-channel elastic wave signals measured on the three concrete specimens were converted to the frequency-phase velocity image by using the phase-shift method. A data processing method was proposed to extract the dominant propagating waves and non-propagating waves from the dispersion images. The dominant wave modes were used to evaluate delamination defects in concrete. It was demonstrated that the surface wave velocity values were useful for characterizing the shallow delamination defects in concrete. In addition, the peak frequency of non-propagating wave modes extracted from the dispersion images gives information on the lateral dimensions and depths of the delamination defects. This study also discussed the feasibility of combined use of the results from propagating and non-propagating wave modes to better understand the information on delamination defects in concrete. As will be discussed, the multi-channel elastic wave measurements enable more accurate, consistent, and rapid measurements and data processing for evaluation of delamination defects in concrete than the single-channel sensing method.

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“…Contemporary China is in the period of social transformation, the objective existence of economic development and interest differentiation, social progress and contradiction, institutional reform and the lag of laws, concept change and moral anomie determines the great importance of building a harmonious society and constructing a public service system [2]. However, as an important part of public service, sports play an important role in comprehensively promoting the national construction plan.…”

Section: Problems Of Sports Public Servicementioning

confidence: 99%

“…The characteristics of recreational sports of square dance has been deeply loved by the rural villagers, together with the implementation of the national fitness program and the local government's wide attention, it promotes the spread of square dance in rural areas to a certain extent. However, in the period of social transformation, the development of China's sports public services has shown a clear non-equalization situation, which has actually caused the inequality of our citizens' sports rights [2]. In terms of the development of rural square dance, there is a clear difference between the rural areas and the urban areas regardless of origin implementation, exercise conditions, activities carried out, which highlights the uneven development of sports public services in a sense.…”

Section: Introductionmentioning

confidence: 99%

Sports Psychological Measurement And Statistical Method from the Perspective of Sports Public Service

Liu¹

2017

Proceedings of the 2017 3rd International Conference on Economics, Social Science, Arts, Education and Management Engineering (

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Abstract. In this paper, the literature and data induction method is used to study the rural square dance from the perspective of the supply mechanism of sports public service. The study found that problems such as single supply subject, limited scope of supply and inadequate supply power still existed in the rural square dance. Secondly, in view of the above problems, this paper adopts the measures to diversify the supply mechanism, expand the scope of supply and improve the supply power. Finally, this paper puts forward the prospect and two suggestions for the future development of rural square dance.

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Analysis of wave motion in one-dimensional structures through fast-Fourier-transform-based wavelet finite element method

Cited by 37 publications

References 33 publications

Microstructure and properties of Cu-Sn-Zn-TiO2 nano-composite coatings on mild steel

Microstructure and properties of Cu-Sn-Zn-TiO2 nano-composite coatings on mild steel

Evaluation of Delamination in Concrete by IE Testing Using Multi-Channel Elastic Wave Data

Sports Psychological Measurement And Statistical Method from the Perspective of Sports Public Service

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