کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1759808 1019298 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Harmonic analysis of lossy, piezoelectric composite transducers using the plane wave expansion method
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم آکوستیک و فرا صوت
پیش نمایش صفحه اول مقاله
Harmonic analysis of lossy, piezoelectric composite transducers using the plane wave expansion method
چکیده انگلیسی

Periodic composite ultrasonic transducers offer many advantages but the periodic pillar architecture can give rise to unwanted modes of vibration which interfere with the piston like motion of the fundamental thickness mode. In this paper, viscoelastic loss is incorporated into a three-dimensional plane wave expansion model (PWE) of these transducers. A comparison with experimental and finite element data is conducted and a design to damp out these lateral modes is investigated. Scaling and regularisation techniques are introduced to the PWE method to reduce ill-conditioning in the large matrices which can arise. The identification of the modes of vibration is aided by examining profiles of the displacements, electrical potential and Poynting vector. The dispersive behaviour of a 2–2 composite transducer with high shear attenuation in the passive phase is examined. The model shows that the use of a high shear attenuation filler material improves the frequency band gap surrounding the fundamental thickness mode.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 48, Issue 8, December 2008, Pages 652–663
نویسندگان
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