Pengaruh dari Direct Field Component pada Ruang Akustik dengan menggunakan SEA Model

Abstract

Statistical Energy Analysis (SEA) is a well-known method to analyze the flow of acoustic and vibration energy in a complex structure. This study investigates the application of the corrected SEA model in a non-reverberant acoustic space where the direct field component from the sound source dominates the total sound field rather than a diffuse field in a reverberant space which the classical SEA model assumption is based on. A corrected SEA model is proposed where the direct field component in the energy is removed and the power injected in the subsystem considers only the remaining power after the loss at first reflection. Measurement is conducted a box divided into two rooms separated by a partition with an opening where the condition of reverberant and non-reverberant can conveniently be controlled. In the case of a non-reverberant space where acoustic material was installed inside the wall of the experimental box, the signals are corrected by eliminating the direct field component in the measured impulse response. Using the corrected SEA model, comparison of the coupling loss factor (CLF) with the theory shows good agreement.

Pengukuran Sound Pressure Level (SPL) dalam kabin mobil dengan menggunakan SEA Model

“…Kondisi seperti ini mengakibatkan penggunaan SEA di dalam kabin kurang akurat. Suatu perkembangan dari metode SEA sudah di lakukan dengan menghilangkan bagian suara langsung(direct field) dari total energi suara sehingga hanya bagian suara hasil pantulan (reverberant field) yang akan di analisa oleh SEA [10]. Oleh karena itu, artikel ini fokus pada penggunaan SEA model yang sudah dikembangkan dan diaplikasikan di dalam kabin mobil untuk memprediksi tingkat kebisingan.…”