Dynamic behavior and resonance frequencies of air-qap resonators = 에어갭 공명기의 동특성 및 공진주파수

다국어 초록 (Multilingual Abstract)

It has been already reported in the author’s previous paper (Kang, 2000) that the air-gap system composed of the partition sheet and the air-gap is effective in suppressing a resonant peak, which is split into two peaks on both sides of the original peak. It may be said that this phenomenon is analogous to that occurred in the cavities with the Helmholtz resonator. In general, the input acoustic impedance in the entrance of the neck of the Helmholtz resonator is considered to examine its performance. Similarly in this paper a reflection coefficient is evaluated as the ratio of the acoustic pressure of a wave incident upon the lower surface of the sheet, to the pressure reflected from the surface. In addition, an analogy of the air-gap system to the Helmholtz resonator is offered by means of obtaining the inertance and the compliance, which let the air-gap system act as a band-pass filter.

목차 (Table of Contents)

• 1. INTRODUCTION
• 2. REFLECTION COEFFICIENT
• 2.1. Gap effect
• 2.2. Headliner effect
• 2.3. Roof effect
• 3. HELMHOLTZ RESONATOR
• 3.1. Resonance frequencies
• 3.2. Analogy to the Helmholtz resonator
• 3.2.1. Physical concept on the resonance frequency
• 3.2.2. Analogy of the resonance frequency
• 4. SUMMARY