内燃机机械噪声与燃烧噪声识别

The identification of mechanical noise and combustion noise in internal combustion engine

针对内燃机噪声识别问题,建立数学模型并编制相应的程序,实现燃烧噪声和机械噪声的频谱分离和A计权声功率级计算。以单缸四冲程汽油机为例,通过构造包含干扰噪声的理论算例仿真识别,验证了程序的准确性和实用性。识别结果表明,分离前/后的燃烧噪声和机械噪声的频谱吻合良好,声功率级误差很小。

For identification of Internal Combustion engine （IC engine） noise, a mathematical model is established, and the corresponding procedures are generated, and the spectrums of the combustion noise and mechanical noise are separated and their Aweighted sound power levels are figured out. Taking example for a single cylinder four-stroke motor, by constructing theoretical examples that include interferential noises to simulate the identification, the accuracy and practicability of the procedures can be validated. Results of identification show that the spectrums of the combustion noise and mechanical noise before and after separation are agreed well, errors of A-weighted sound power level are small.