Acoustic Attenuation Performance Analysis and Optimisation of Expansion Chamber Coupled Micro-perforated Cylindrical Panel Using Response Surface Method

This paper describes boundary element method (BEM), experimental and optimization studies conducted to understand the potential of expansion tube coupled micro-perforated cylindrical panel (MPCP) enhance acoustic attenuation for in-duct noise control issues. Due complex structure MPCP correct prediction attenuation, BEM is adopted on basis PLM Simcenter 3D software compute sound transmission loss (TL). As in-shape with numbers sub-milimeter holes, additive manufacturing based printing was utilized model prototyping reduce current design limitation enabled fast fabrication. The TL measurement two-load modal validation. Subsequently, a parametric concerning perforation hole diameter, ratio depth air space are carried out investigate acoustical performance. Optimization via response surface (RSM) used as it allows evaluating effects multiple parameters required in this study. validation result shows that error between measured values relatively small show good agreement. R-square value 0.89. finding from study widen peak can be achieve by reducing diameter one way increase amplitude increasing cavity depth. Finally, optimized commercial vacuum cleaner verification. pressure level (SPL) significantly attenuated within objective frequency 1.7 kHz its A-weighted SPL reduced 1.8 dB.