Date of Award


Document Type

Master's Thesis

Degree Name

Master of Science in Mechanical Engineering (MS)

College, School or Department Name

Department of Mechanical Engineering-Engineering Mechanics


Charles D. Van Karsen


This thesis aims at understanding the vibro-acoustic behavior related to vehicle boom in passenger cars. Acoustic boom in the 40 Hz frequency range is studied on a 2013 Chevrolet Cruze LTZ model. Impact testing, full vehicle structural and acoustic modal tests are first performed to understand, locate and test the boom phenomenon and the fluid-structure interaction between the vehicle structure and acoustic cavity. Later, different iterations like effect of door cavities, trunk cavity and rear seats are also tested to understand their participation. LMS Test.Lab software is used for data acquisition, processing and analysis of the test results.

Finite Element Analysis (FEA) is also carried out for car shaped simple box like structures to help understand the fluid-structure interaction. Different analysis techniques such as coupled and uncoupled Boundary Element method (BEM) and Finite Element Method (FEM) are performed to understand the difference between the techniques. Iterations for effect of door cavities and rear seats are also performed for these simple car models (SCM). HyperMesh, LMS Virtual.Lab and MATLAB software packages are used for modeling, analysis and plotting of results.

With the help of this thesis, an insight in the vibro-acoustic interaction for passenger cars is gained.