Experimental Analysis on Structure-Borne Noise in an Enclosure
This paper present the experimental analysis conducted on a structure-borne noise in a rectangular enclosure
prototype made by joining of sheet aluminum metal and plywood. The study is significant as the structural noise could cause
annoyance and dizziness thus by deepening the comprehension on the structure-borne noise, the noise problem could be
overcome. In this study, modal analysis is carried out to seek the structure’s behavior in order to identify the characteristics
of enclosure in frequency domain ranging from 1 Hz to 100 Hz. Here, numbers of modes are identified and the characteristic
of mode shape is categorized. Modal experiment is used to diagnose the structural behavior while microphone is used to
diagnose the sound. Spectral testing is performed on the enclosure and it is acoustically excited using shaker and as it
vibrates, the vibrational and noise responses sensed by tri-axis accelerometer and microphone sensors are recorded
respectively. The modal modes extracted from the experiment are validated by simulation performed using MSC
NASTRAN/PATRAN software. From developed prototype, the structural behavior can be diagnosed and the mode shape
can be determined. In the end of the study, the relation and major contribution of the structural and sound in the enclosure
can be identified from the observation of both spectrums.
Keywords - Enclosure, Modal Analysis, Sound Analysis, Structure-Borne Noise.