A Modal Study of Damping Treatments to Improve Low Frequency Sound Transmission Loss of a Structure Kolano and Saha Engineers Incorporated

Format:

Conference/Event

Author/Creator:

Deshpande, Deshpande, author.

Contributor:

Cone, Kerry

Saha, Pranab

Conference Name:

Noise and Vibration Conference and Exhibition (2017-06-12 : Grand Rapids, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2017

Summary:

AbstractMost of NVH related issues start from the vibration of structures where often the vibration near resonance frequencies radiates the energy in terms of sound. This phenomenon is more problematic at lower frequencies by structureborne excitation from powertrain or related components. This paper discusses a laboratory based case study where different visco-elastic materials were evaluated on a bench study and then carried on to a system level evaluation. A body panel with a glazing system was used to study both airborne and structureborne noise radiation. System level studies were carried out using experimental modal analysis to shift and tune the mode shapes of the structure using visco-elastic materials with appropriate damping properties to increase the sound transmission loss. This paper discusses the findings of the study where the mode shapes of the panel were shifted and resulted in an increase in sound transmission loss. This eventually resulted in reduced sound level inside the cabin

Notes:

Vendor supplied data

Publisher Number:

2017-01-1852

Access Restriction:

Restricted for use by site license