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	1. Research on ultrasonic beam steering using multiplysics in bonded structures
	Qiu Zhaoguo
	Physics 27 July 2010
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	Abstract:Ultrasonic beam steering is an essential feature while modeling for inspection methodologies and phased array ultrasonic systems. The two methods of modeling beam steering are to model a wedge or use Huygens principle to generate a propagating wave front at the required angle. In this paper, a numerical model for time-domain ultrasonic plane wave for a desired angle is presented. The propagating angle is a function of the time-domain and the distance. The control parameter time is used for steering the beam at the desired angle as well as march at the required temporal discretisation. The single element line sources for plane wave are modeled with a propagating wave front at a desired angle. The ultrasonic beam is modeled using a number of discrete line elements excited without any time-delay.
	TO cite this article:Qiu Zhaoguo. Research on ultrasonic beam steering using multiplysics in bonded structures[OL].[27 July 2010] http://en.paper.edu.cn/en_releasepaper/content/4380061


	2. Effects of L-type Matching Network on Characteristics of Ultrasonic Transducers
	FANG You-yan ,Lin Shuyu
	Physics 19 January 2009
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	Abstract:A new L-type matching network was designed and the effects of matching network on resonant frequency and vibrational characteristics of ultrasonic transducers were studied. The theory and the experiment show that the L-type matching network composed of two inductors can change the resonant frequency.The transmission efficiency and the coupling between ultrasonic generator and transducer can be improved by changing the parameters of matching network.
	TO cite this article:FANG You-yan ,Lin Shuyu. Effects of L-type Matching Network on Characteristics of Ultrasonic Transducers[OL].[19 January 2009] http://en.paper.edu.cn/en_releasepaper/content/28022

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	3. Acoustic wave propagation within the Bragg gap in periodic sound ducts
	Zhiyong Tao,Weiyu He,Yumeng Xiao,Weihe Zhang,Xinlong Wang
	Physics 14 January 2009
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	Abstract:The well-known Bragg resonance prohibits the propagation of waves in periodic waveguides. In this work we report that sound transmission within the Bragg gap can be made possible through higher-order sound modes that break through the forbidden band by the interactions of different sound modes. We perform the investigation, both theoretical and experimental, in an acoustic duct with periodically varying wall. The theoretical prediction indicates that the guided wave modes can interact in waveguides of transevrse scales comparable to wavelength, so that the forbidden band undergos an abnormal change, thus giving rise to the considerable compression in bandwidth and a sharp descent on the upper edge of the stopband. The experiment comfirms the prediction, and the measurements of the transmission loss and the radial distribution of sound field agree quite well with the theory.
	TO cite this article:Zhiyong Tao,Weiyu He,Yumeng Xiao, et al. Acoustic wave propagation within the Bragg gap in periodic sound ducts[OL].[14 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27842


	4. EMD-based extraction of signal modulation
	Fei Bao,Xinlong Wang,Zhiyong Tao,Qinfu Wang,Shuanping Du
	Physics 13 January 2009
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	Abstract:A novel approach based on the Empirical Mode Decomposition (EMD) is made to extract information of modulation from complex signals. It is shown that EMD is capable of adaptively recovering modulation components submerged by background noise, and it achieves better performance than the traditional methods. A modified EMD technique for slowly modulated signals is then developed to further alleviate the noise effect, and it yields a remarkably improved performance for demodulation. A practical example is given to demonstrate the potential application of the novel technique in acoustic feature acquisition.
	TO cite this article:Fei Bao,Xinlong Wang,Zhiyong Tao, et al. EMD-based extraction of signal modulation[OL].[13 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27704


	5. Formation and transport of granular heaps in vertically vibrated containers with periodic corrugated bottoms
	Hua Zhang,Qi Wang,Guoqing Miao
	Physics 14 January 2008
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	Abstract:We report the formation and transportation of granular heaps in vertically vibrated containers with two types of periodic corrugated bottoms, one with a periodic array of ten identical Plexiglas rectangles mounted (named periodic container), and other with single-step (named single-step container). For the periodic container, when the excitation was weaker, several small heaps formed, and the number of them was the same as that of the rectangles on the bottom. As the excitation increased, the system presented three types of states：single well-defined heap, weaker wave, and stronger wave. Some local convections were observed in the interior of heap. For the single-step container, we observed the transportation of a heap toward step. We propose that the compressive force from the ambient gas plays a crucial role for the movement of the heap.
	TO cite this article:Hua Zhang,Qi Wang,Guoqing Miao. Formation and transport of granular heaps in vertically vibrated containers with periodic corrugated bottoms[OL].[14 January 2008] http://en.paper.edu.cn/en_releasepaper/content/18032


	6. Simulation of SH-TE seismoelectric logging
	cui zhiwen ,wang kexie
	Physics 29 October 2007
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	Abstract:The seismoelectric field excited by purely torsional loading applied directly to the borehole wall is considered. A brief formulation and some computed waveforms show the advantage of using SH-TE seismoelectric waves logging to measure shear velocity in a fluid-saturated porous formation. By assuming the acoustic field is not influenced by its induced electromagnetic field due to seismoelectric effect, the coupling governing equations for electromagnetic field are reduced to Maxwell equations with a propagation current source. It shows this simplification is valid and the borehole seismoelectric conversion efficient is mainly dependent on the electrokinetic coupling coefficient. The receivers to detect the conversion electromagnetic field and obtain shear velocity can be set in the borehole fluid in SH-TE seismoelectric waves log.
	TO cite this article:cui zhiwen ,wang kexie . Simulation of SH-TE seismoelectric logging[J].Chinese Physics Letter，2007，24（12）：3454~3457.


	7. Empirical Formulas of Sound Absorption Coefficients and Spectrums of
	zhang xin an
	Physics 30 July 2007
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	Abstract:A new theory is put forward that the sound absorption principle of perforated panel is similar to imperforated plate. Sound is absorbed by the vibration of panel, while not the holes on them. Base of this description, the empirical formulas of sound absorption coefficients of perforated panel and imperforated plate (diaphragm) are obtained, i.e. the sound absorption coefficients are descend with the increase of resonance frequency linearly. In addition, sound absorption spectrum formulas of perforated panel and imperforated plate (diaphragm) have also been found, they can be 0.1 to the power of function of resonance frequency’s sequence number and bandwidth.
	TO cite this article:zhang xin an. Empirical Formulas of Sound Absorption Coefficients and Spectrums of[OL].[30 July 2007] http://en.paper.edu.cn/en_releasepaper/content/14313


	8. The relationship of resonance sound absorption frequency between perforated panel and thin plate
	Xin an Zhang
	Physics 16 February 2007
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	Abstract:This paper investigates the relationship of resonance sound absorption frequency between perforated panel and thin plate. Classical theory believed that the perforated panel and thin plate have different sound absorption principle and the formula to calculate resonance sound absorption frequency have been deduced from different way, inevitably, they are unlike for their equation express. However, it is discovered that the two formulas can be equaled to each other for the common materials used in practice. The two formulas have been examined and deduced being equal when the density and thickness of materials are below 8 and above 0.1mm. respectively.
	TO cite this article:Xin an Zhang . The relationship of resonance sound absorption frequency between perforated panel and thin plate[OL].[16 February 2007] http://en.paper.edu.cn/en_releasepaper/content/11172


	9. The Formula of Sound Absorption Spectrums For Fibrous Materials
	Zhang Xin’an
	Physics 06 December 2006
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	Abstract:The current sound absorption theory is still the Rayleigh model. But this model is just the theory model. It is not agreement with the practice even though it had been studied for over 100 years. Based of this theory, Zwikker and Kosten established the theory of acoustical effective density and the effective bulk modulus which is also the popular theory in acoustics literature to explain the sound absorption characteristics of fibrous materials. However, because of the complexity of these expressions, it is difficult to obtain physical insight into the acoustic behavior of the porous materials and to determine the dominant mechanism for sound absorption for a given material at a given frequency. Alternatively there are very simple expressions. Through testing the sound absorption coefficient of thick and thin fiber layers at different frequency with the back distance 5cm,10cm,20cm,30cm and 40cm,the author found the law of sound absorption at different frequency and also get the formula. With this formula, we can get the accurate relative sound absorption coefficient of fibrous materials from frequency.
	TO cite this article:Zhang Xin’an. The Formula of Sound Absorption Spectrums For Fibrous Materials[OL].[ 6 December 2006] http://en.paper.edu.cn/en_releasepaper/content/10199


	10. fiber’s vibration, maximum tension, compress modulus，sound absorption coefficient formula
	Zhang Xin’an
	Physics 05 December 2006
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	Abstract:Fibrous materials had been used as sound absorption materials for over one century .The current sound absorption theory is still the Rayleigh model. But this model is just the theory model. It is not agreement with the practice even though it had been studied for over 100 years. Based of this theory, Zwikker and Kosten established the theory of acoustical effective density and the effective bulk modulus which is also the popular theory in acoustics literature to explain the sound absorption characteristics of fibrous materials. However, because of the complexity of these expressions, it is difficult to obtain physical insight into the acoustic behavior of the porous materials and to determine the dominant mechanism for sound absorption for a given material at a given frequency. Alternatively there are very simple expressions. A new theory was put forward that fibrous material absorb the sound by the fiber’s vibration. This theory can be proved by the equation obtained by the vibration analyze and also the experimental sound absorption formula of fibrous material in another paper of the author.
	TO cite this article:Zhang Xin’an. fiber’s vibration, maximum tension, compress modulus，sound absorption coefficient formula[OL].[ 5 December 2006] http://en.paper.edu.cn/en_releasepaper/content/10161

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