AUTHORS : Zhigang Wang, Zeyu Weng, Suyi Shen, Minghui Li, Xiaoqing Shen, Shufeng Xiang

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ABSTRACT : This paper took the intake system of an internal combustion forklift as a whole, defined the filter core in air filter as a porous media characterized by geometrical and property parameters, and simulated perforated plate by creating acoustic impedance relationship between front and rear of perforated plate. According to the air intake noise test results of the internal combustion forklift，the improved scheme of intake system was proposed. The finite element models of intake system were established by the finite element method, and then their transmission losses were obtained. The comparison of the transmission losses showed that the acoustical performance of intake system was improved efficiently. Finally, the internal combustion forklift vehicle noise test was carried out; the test results showed that noise sound pressure level at ears were obviously reduced by improved intake system. Thus, this method is feasible and can be used for improvement on the acoustic performance of intake system.

KEYWORDS : Internal combustion forklift, intake system, acoustic performance, finite element method, improvement

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