Author Correction: Directional sound beam emission from a configurable compact multi-source system

Responding to complexity and particularity welding on the geometry of TKY tubular node, this paper constructs mathematical model of tubular joint weld of arbitrary section by simplifying the geometry structure, and draws welded joints and ultrasonic sound beam lines based on the actual specifications in order to solve the problems of low efficiency, positioning difficulty, missing inspection and etc. The computeraided simulation technology can realize the visualization in the beam coverage model of welded joints, which can commendably guide the design of ultrasonic phased array inspection and overcome the blindness of the instrument detection parameters, thus improving the effectiveness and pertinence of the actual detection. Study shows that it is beneficial to enhance the effectiveness of the detection tubular joint weld by employment of Visual beam and ultrasonic phased array technology.

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Focusing of a sound beam in an underwater waveguide using a vertical antenna

Acoustical Physics ◽

10.1134/s1063771013030020 ◽

2013 ◽

Vol 59 (3) ◽

pp. 297-304 ◽

Cited By ~ 4

Author(s):

V. V. Artel’nyi ◽

P. V. Artel’nyi ◽

A. L. Virovlyansky ◽

P. I. Korotin ◽

A. V. Nasedkin ◽

...

Keyword(s):

Sound Beam ◽

Vertical Antenna

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A more general model equation of nonlinear Rayleigh waves and their quasilinear solutions

Modern Physics Letters B ◽

10.1142/s0217984916500962 ◽

2016 ◽

Vol 30 (08) ◽

pp. 1650096 ◽

Cited By ~ 4

Author(s):

Shuzeng Zhang ◽

Xiongbing Li ◽

Hyunjo Jeong

Keyword(s):

Rayleigh Waves ◽

General Equation ◽

Wave Motion ◽

Numerical Solutions ◽

Second Harmonic ◽

Approximate Equation ◽

Finite Amplitude ◽

Sound Beam ◽

Quasilinear Theory ◽

Sound Beams

A more general two-dimensional wave motion equation with consideration of attenuation and nonlinearity is proposed to describe propagating nonlinear Rayleigh waves of finite amplitude. Based on the quasilinear theory, the numerical solutions for the sound beams of fundamental and second harmonic waves are constructed with Green’s function method. Compared with solutions from the parabolic approximate equation, results from the general equation have more accuracy in both the near distance of the propagation direction and the far distance of the transverse direction, as quasiplane waves are used and non-paraxial Green’s functions are obtained. It is more effective to obtain the nonlinear Rayleigh sound beam distributions accurately with the proposed general equation and solutions. Brief consideration is given to the measurement of nonlinear parameter using nonlinear Rayleigh waves.

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Wave Physics of Sound Field. The Sound Beam

Ultrasonic Testing of Materials ◽

10.1007/978-3-662-02296-2_5 ◽

1977 ◽

pp. 62-89 ◽

Cited By ~ 1

Author(s):

Josef Krautkrämer ◽

Herbert Krautkrämer

Keyword(s):

Sound Field ◽

Sound Beam

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Adaptive Beam-Forming Based on the Mutative Scale Chaos Optimization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.588-589.703 ◽

2012 ◽

Vol 588-589 ◽

pp. 703-706

Author(s):

Zhi Wei Zhang ◽

Bo Wang ◽

Zhi Gang Zhu

Keyword(s):

Optimization Problem ◽

Optimization Method ◽

Beam Forming ◽

Distribution Law ◽

Sound Beam ◽

Chaos Optimization ◽

Vector Error ◽

Doa Mismatch ◽

Global Optimal ◽

Signal Vector

In order to improve the SINR of the beam-former in the case of DOA mismatch, the paper raises the probability of constraint beam-forming algorithm based on mutative scale chaos optimization in connection with the worst performance of the best sound beam-forming algorithm. By introducing the probability constraints confidence interval and the signal vector error distribution law in the beam-forming, the constrained optimization problem is eventually turned into a nonlinear optimization problem. Then the global optimal weight is searched by the mutative scale chaos optimization method. Simulations have shown that the algorithm can significantly improve the SINR.

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Design and Tests of Audio Directional System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.198-199.1047 ◽

2012 ◽

Vol 198-199 ◽

pp. 1047-1052

Author(s):

Yang Zhang ◽

Li Min Tao

Keyword(s):

Theoretical Analysis ◽

Light Beam ◽

Test Data ◽

Harmonic Distortion ◽

Experimental System ◽

The Self ◽

Far Field ◽

Sound Beam ◽

System Components ◽

Working Principle

Audio directional system is a new-style loudspeaker, which can project the sound beam onto a given region as light beam. In this paper, the basic working principle and the system components of audio directional system are proposed. The total harmonic distortion of the self-demodulated signal is analyzed based on “Berktay far-field solution”. Besides, this paper has designed the audio directional experimental system whose performances have been tested. The shortcomings of the self-demodulation theory are pointed out after the comparison between the test data and the theoretical analysis results.

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