Application of System Engineering Processes to Analyze and Predict Engine Cooling Fan System Noise for Off-highway Machines

摘要

System Engineering processes were applied to a cooling fan system noise analysis for a back-hoe loader machine. The cooling fan system noise analysis combined elements of aeroacoustic theory, Fan Law, sound power measurements and particle image velocimetry. The backhoe-loader cooling fan system consisted of a cooling fan, multiple radiators in front of the cooling fan, a shroud, a mock engine behind the cooling fan, and a simulated engine compartment. A vortex flow structure was measured in front of the cooling fan. The cooling fan system sound power spectrum was measured. The radiated sound power spectrum for the vortex interaction with the fan blades was calculated. Measured and predicted cooling fan system sound power results were compared. The overall structure and approach will be presented along with an overview of the theory and initial results.