Date of Award

2025

Document Type

Open Access Master's Thesis

Degree Name

Master of Science in Mechanical Engineering (MS)

Administrative Home Department

Department of Mechanical and Aerospace Engineering

Advisor 1

Sriram Malladi

Committee Member 1

Jim DeClerck

Committee Member 2

Jason Blough

Abstract

This research covers a variety of hydraulic configurations to characterize wave propagation and transmission loss. This is mathematically calculated via a transfer matrix that separates the acoustic pressure waves into upstream and downstream. Although there is a solid mathematical basis (ASTM E2611) for these calculations, a range of tests were performed to compare the accuracy of these calculations to real-time data. The main set of tests were performed on a two-part impedance tube setup with a sample section in the center. A total of 13 dynamic pressure transducers (DPT’s) are placed along the bench to record the pressure throughout testing. Three methods known as side branch resonators, Herschel-Quincke tubes, and simple expansion muffler methods all use vibroacoustic attenuation and have been tested and validated on this test bench to better understand the attenuation properties. With this data, these properties can now be accurately characterized through baseline, side branch resonator, and Herschel Quincke (HQ) tube tuning configurations. All of these concepts have been supported by simulation to further validate all experimental results.

Download

Share

COinS