A simulation approach for prediction and reduction of radiated noise of an air cleaner snorkel
The objective of this report is to propose a simulation approach for developing and evaluating the die design modifications that will minimize the radiated noise from an engine air cleaner snorkel. The procedure is firstly to use a commercial finite element program to compute the structural frequency response of a vibrating snorkel due to uniform internal acoustic pressure pulsation, then to use developed programs to estimate the surface acoustic intensity and mean-square vibration velocity, which are useful in identifying potential noise sources and the effectiveness of structural modifications for reducing vibration and radiated noise, for the vibrating snorkel. Various design alternatives that will minimize the structural breakout noise are considered. Initial alternatives are quickly evaluated using a simplified approach with beam elements representing the ribs. The detailed finite element models are used for final evaluation.
radiated noise air cleaner snorkel structural vibration