Mining Vehicle Cabin Interior Noise Simulation And Structural Improvement

In order to improve transport efficiency, reduce traffic density in mining area,enterprises committed to use larger tonnage vehicles, which promoting heavy industrygroup produced mining vehicles with more power engine. Complex road conditionsaggravated cabin’s low-frequency vibration and noise, especially in the range of20～200Hz. Noise of vehicles cabin was worth researchers to investing more time and energy.The paper, based on a AutoCad version of mining vehicles cabin, drawedcorresponding three-dimensional structure model using CATIA. Cabin’s finite elementmodel, acoustic cavity boundary element model and field points model were established inHyperMesh analyzed finite element model’s low-frequency mode in the range of20～200Hz. Applying to acoustic-structure coupled indirectly boundary element methodsimulated acoustic characteristics of the cabin in LMS Virtual.lab Acoustics gotten adriver right ear’s acoustic frequency response characteristics.Taken cabin finite element model’s harmonic response analysis result as boundarycondition, using indirectly boundary element method researched the driver right ear’sacoustic sensitivity response characteristics. The acoustic cavity boundary element modelwas divided into some plates that contribution were studied in the point where the right earof driver’s acoustic sensitivity reached the largest value gotten the plate that contributionwas largest.For acoustic largest contribution plate added stiffener of five kinds of structure toreduce cabin noise. Comparing to the original and five improved plates mode defined thebest plan. The driver right ear’s acoustic frequency response characteristics was simulatedagain, which was compared with original cabin.