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Volume 39 Issue 1
Jan.  2013
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Journal of Beijing University of Aeronautics and Astronautics  > 2013  >  (1): 78-82.
Xu Na, Li Yang, Zhou Zhenggan, et al. Improvement of finite difference time domain method and its application to calculation of ultrasonic sound fields[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, (1): 78-82. (in Chinese)
Citation: Xu Na, Li Yang, Zhou Zhenggan, et al. Improvement of finite difference time domain method and its application to calculation of ultrasonic sound fields[J]. Journal of Beijing University of Aeronautics and Astronautics, 2013, (1): 78-82. (in Chinese)
shu

Improvement of finite difference time domain method and its application to calculation of ultrasonic sound fields

  • 1.

    School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • 2. Aeronautical Manufacturing Technology Research Institute, Shanghai Aircraft Manufacturing Co., Ltd, Shanghai 200436, China

  • Received Date: 13 Oct 2011
  • Publish Date: 31 Jan 2013
    Abstract
  • Finite difference time domain (FDTD) method is an effective way to establish ultrasonic testing model. However, a big difference between acoustic impedances of two adjacent materials may cause instability of the difference computation in the interface of two materials. To solve this problem, based on the conventional FDTD algorithm, an improved FDTD method was introduced by taking the average of the ultrasonic parameters of two materials on both sides of the interface. The model was built for the sound field calculation of the media consisted by two adjacent materials, one of which the acoustical impedance is five orders larger than the other, and the conventional and improved FDTD method were used respectively. Numerical calculation and practical experiments for an ultrasonic probe were accomplished. The results show that the improved FDTD method is a feasible and effective method for ultrasonic sound filed calculation.

     

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