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Radiation Noise Analysis and Structural Optimization of the Air Filter
for a Hybrid Pickup Truck
JIN Dong
2023, 48(24):
115-120.
DOI: 10.16638/j.cnki.1671-7988.2023.024.023
The intake sound pressure leads to the vibration of the air filter shell, which produces
radiation noise. The radiation noise can be suppressed by optimizing the structure of the air filter.
During the test of a hybrid pickup truck, it is found that there is an obvious roaring inside the
engine at 2 000 r/min. According to the investigation of the roaring, it is found that the air filter shell
roaring noise of the intake system is the main contribution source. In order to solve this problem,
the air filter modal analysis and intake sound pressure spectrum calculation are conducted at first,
and the result shows that the excitation of the sound pressure of intake of air filter can resonate with the vibration frequency of the air filter upper panel, resulting in increased noise in the vehicle.
Secondly, through the topology optimization of the upper shell of the air filter, the optimal location
of stiffeners is found, which greatly improves the modal frequency of the upper shell of the air filter,
avoids the frequency of the maximum value of the sound pressure excitation spectrum, and
eliminates resonance. And then, through the calculation of radiated noise, it is confirmed that the
total sound power level of the optimized upper shell of the air filter is reduced by 8 dB(A), and the
noise improvement effect is very significant. Finally, through experimental vehicle verification, it
has been proven that this research method can effectively solve this similar problem.
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