Numerical simulation of electromagnetic acoustic transducer in the time domain

1991 ◽  
Vol 69 (1) ◽  
pp. 89-98 ◽  
Author(s):  
R. Ludwig ◽  
X.‐W. Dai
Keyword(s):  
Numerical Simulation ◽  
Time Domain ◽  
Electromagnetic Acoustic Transducer ◽  
Acoustic Transducer ◽  
The Time Domain

Numerical Simulation by CGM for Moving Force Identification

2012 ◽  
Vol 238 ◽  
pp. 826-829
Author(s):  
Zhen Chen ◽  
Jun Ling Han
Keyword(s):  
Numerical Simulation ◽  
Time Domain ◽  
Bending Moment ◽  
Identification Accuracy ◽  
Time Varying ◽  
Acceptable Solution ◽  
Moving Force ◽  
Ill Posed ◽  
Simulation Results ◽  
The Time Domain

The conjugate gradient method (CGM) is compared with the time domain method (TDM) in the paper. The numerical simulation results show that the CGM have higher identification accuracy and robust noise immunity as well as producing an acceptable solution to ill-posed problems to some extent when they are used to identify the moving force. When the bending moment responses are used to identify the time-varying loads, the identification accuracy is more obviously improved than the TDM, which is more suitable for the time-varying loads identification.

scholarly journals Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Yuedong Xie ◽  
Sergio Rodriguez ◽  
Wenbo Zhang ◽  
Zenghua Liu ◽  
Wuliang Yin
Keyword(s):  
Analytical Solution ◽  
Time Domain ◽  
Fdtd Method ◽  
Force Density ◽  
Large Radius ◽  
Electromagnetic Acoustic Transducer ◽  
Transducer Array ◽  
Ultrasound Waves ◽  
Acoustic Transducer ◽  
Frequency Regime

Previously, we developed a method based on FEM and FDTD for the study of an Electromagnetic Acoustic Transducer Array (EMAT). This paper presents a new analytical solution to the eddy current problem for the meander coil used in an EMAT, which is adapted from the classic Deeds and Dodd solution originally intended for circular coils. The analytical solution resulting from this novel adaptation exploits the large radius extrapolation and shows several advantages over the finite element method (FEM), especially in the higher frequency regime. The calculated Lorentz force density from the analytical EM solver is then coupled to the ultrasonic simulations, which exploit the finite-difference time-domain (FDTD) method to describe the propagation of ultrasound waves, in particular for Rayleigh waves. Radiation pattern obtained with Hilbert transform on time-domain waveforms is proposed to characterise the sensor in terms of its beam directivity and field distribution along the steering angle, which can produce performance parameters for an EMAT array, facilitating the optimum design of such sensors.

scholarly journals Experimental and simulated milling stability tests

Mechanik ◽  
2017 ◽  
Vol 90 (11) ◽  
pp. 965-967
Author(s):  
Piotr Andrzej Bąk ◽  
Krzysztof Jemielniak
Keyword(s):  
Numerical Simulation ◽  
Stability Analysis ◽  
Time Domain ◽  
Cutting Parameters ◽  
Milling Machine ◽  
Machined Surface ◽  
Simulation Results ◽  
The Stability ◽  
The Time Domain

Self-excited vibrations significantly reduce the milling productivity, deteriorate the quality of machined surface and tool life. One of the ways to avoid these vibrations is to modify the cutting parameters based on the stability analysis results. A method of numerical simulation of self-excited vibrations in the time domain can be used for this purpose. A comparison of numerical simulation results with those from experiments conducted using a milling machine is presented. The results confirm the correctness of applied modeling.

scholarly journals DYNAMICS OF AN ELASTIC AIRPLANE

Aviation ◽  
2005 ◽  
Vol 9 (1) ◽  
pp. 8-13
Author(s):  
Peter Chudý ◽  
Vladimír Daněk
Keyword(s):  
Numerical Simulation ◽  
Analytical Solution ◽  
Time Domain ◽  
Aerospace Engineering ◽  
Elastic Response ◽  
Elastic Model ◽  
The Past ◽  
University Of Technology ◽  
Complex Simulation ◽  
The Time Domain

This paper presents the work performed by the Institute of Aerospace Engineering at the Brno University of Technology. The purpose of the project was to compare the results obtained from classical analytical solutions and a complex numerical simulation of an airplane's aero elastic response. Compared to the analytical solution, which reduces the entire process to a straightforward manipulation with time‐proven graphs and tables, the numerical simulation offers a more complex description of the dynamic processes. A complex simulation, in contrast to the analytical solution providing us with only one estimated parameter, allows monitoring selected quantities in the time domain, thus giving us a tool for a visual qualification of the investigated process. In the past, dynamic aeroelastic properties were estimated utilizing simplified stick beam models. The desire for more complex aero elastic simulations led to the concept of the advanced aero elastic model, coupling advanced 3D structural FEM models with proven aerodynamic theory in the form of the DLM panel method.

Modeling of Floating Pneumatic Rubber Fender in Numerical Simulation of Side-by-Side Moored Vessels

2003 ◽  
Author(s):  
Shigeki Sakakibara ◽  
Masayoshi Kubo
Keyword(s):  
Numerical Simulation ◽  
Time Domain ◽  
Simulation Method ◽  
Shear Load ◽  
Performance Tests ◽  
Compression Tests ◽  
Numerical Simulation Method ◽  
Load Tests ◽  
Pure Compression ◽  
The Time Domain

In this paper, we approach a modeling of the floating pneumatic rubber fender in the time domain numerical simulation of side-by-side moored vessels. In the investigations, we conduct several performance tests such as pure compression tests and compression with shear load tests for the miniature fender. From the investigations, it is concluded that it is necessary to consider the actual fender performance for the development of the numerical simulation method.

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