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 aback-hoe loader machine. The cooling fan system noise analysis combined elements of aeroacoustictheory, Fan Law, sound power measurements and particle image velocimetry.The backhoe-loader cooling fan system consisted of a cooling fan, multiple radiators infront of the cooling fan, a shroud, a mock engine behind the cooling fan, and a simulated enginecompartment. A vortex flow structure was measured in front of the cooling fan. The cooling fansystem sound power spectrum was measured. The radiated sound power spectrum for the vortexinteraction with the fan blades was calculated. Measured and predicted cooling fan systemsound power results were compared.The overall structure and approach will be presented along with an overview of the theoryand initial results.