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Iranian Journal of Mechanical Engineering Transactions of the ISME، جلد ۲۲، شماره ۲، صفحات ۲۱-۳۷
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عنوان انگلیسی Investigation and Comparison of Three Popular Ultrasonic Generators (PZT, PVDFEMFi) for Employing in Acoustic Scaling
چکیده انگلیسی مقاله Acoustic scaling is one of the efficient techniques for measuring acoustic
parameters of large and luxury places. Due to the range of acoustic
scaling frequency, an airborne ultrasonic transducer has been used for
transporting the power to the air. One major problem of ultrasonic
transducers, radiating acoustic energy into the air, is to find the proper
acoustic impedance of one or more matching layers. This work aims at
developing an original solution to the acoustic impedance mismatch
between transducer and air. Therefore we consider three piezoelectrics,
PZT, PVDF, and EMFi transducers and air that have high acoustic
impedance deference. We proposed the use of a genetic algorithm (GA) to
select the best acoustic impedances for matching layers from the material
database for a narrow band ultrasonic transducer that works at a
frequency below the 1MHz by considering attenuation. This yields a
highly more efficient transmission coefficient. Also, the results showed
that by using the increasing number of layers we can increase our chance
to find the best sets of materials with valuable both in acoustic impedance
and low attenuation. Precisely, the transmission coefficient is almost
higher than 80% for the more studied cases.
کلیدواژه‌های انگلیسی مقاله acoustic impedance,matching layers,Ultrasonic transducers,Genetic algorithm (GA),PZT,PVDF,EMFi
نویسندگان مقاله S. Saffar |
Corresponding Author, Associate Professor, Department of Acoustics and Sound Engineering, IRIB University, P.O. Box 1986916511, Tehran, I.R. Iran

نشانی اینترنتی https://jmee.isme.ir/article_246039_f12dd0470bf803968e984f8f14896ded.pdf
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