ACOUSTIC WAVE PROPAGATION IN HIGH SCALE IMPEDANCE MISMATCH MEDIUMS

Md Rabiul Awal; Muzammil  Jusoh; Muhammad Syarifuddin Yahya; Salisa Abdul  Rahman; Ahmad Nazri  Dagang; Nurul Adilah  Abdul Latiff; Hidayatul Aini  Zakaria; Shakir  Saat

doi:10.31436/iiumej.v22i2.1563

Authors

Md Rabiul Awal Universiti Malaysia Terengganu https://orcid.org/0000-0002-9668-2733
Muzammil Jusoh Universiti Malaysia Perlis
Muhammad Syarifuddin Yahya Universiti Malaysia Terengganu
Salisa Abdul Rahman Universiti Malaysia Terengganu
Ahmad Nazri Dagang Universiti Malaysia Terengganu
Nurul Adilah Abdul Latiff Universiti Malaysia Terengganu https://orcid.org/0000-0002-9832-688X
Hidayatul Aini Zakaria Universiti Malaysia Terengganu
Shakir Saat Albukhary International University

DOI:

https://doi.org/10.31436/iiumej.v22i2.1563

Keywords:

Acoustic Energy Transfer, Acoustic Wave, Impedance Mismatch, ZnO, Multilayered Medium

Abstract

A finite element analysis of acoustic propagation in a multilayered medium is presented in this paper. A circular transmitter (diameter 14 mm, thickness 3 mm) and a rectangular receiver (20×10×0.5 mm³) are set to detect the variations in the propagation pattern. A complex medium (70×40×60 mm³) composed of skin, fat, muscle, bone and liquid is designed in a simulated environment. A scale of frequencies (10 kHz to 2 MHz) is applied to trace the impact on the propagation pattern as well. It is found from the analysis that fat and liquid layers affect the acoustic propagation the most (-69 dB), which results in a significant drop in the received sound pressure level at the receiving end. Again, other than skin and fat layers, low frequencies (less than 1 MHz) are more beneficial in terms of sound pressure level. However, higher frequencies contribute to lower displacements at the receiving end, which will cause less power potential as well.

ABSTRAK: Analisis elemen terhingga bagi penyebaran akustik dalam medium berlapis dibentangkan dalam kajian ini. Pemancar bulat (diameter 14 mm, ketebalan 3 mm) dan penerima segi empat tepat (20 × 10 × 0.5 mm³) diatur bagi mengesan perubahan pola penyebaran. Medium kompleks (70 × 40 × 60 mm³) yang terdiri daripada kulit, lemak, otot, tulang dan cecair direka dalam persekitaran simulasi. Skala frekuensi (10 kHz hingga 2 MHz) digunakan bagi mengesan corak penyebaran. Dapatan kajian menunjukkan bahawa lapisan lemak dan cecair mempengaruhi penyebaran akustik (-69 dB), yang mengakibatkan penurunan mendadak tahap penerimaan tekanan bunyi di hujung penerima. Selain lapisan kulit dan lemak, frekuensi rendah (kurang dari 1 MHz) adalah lebih berguna dari segi tahap tekanan suara. Walau bagaimanapun, frekuensi lebih tinggi menyebabkan kurang anjakan di hujung penerima, sekaligus mengurangkan potensi daya tenaga.

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