The motive source of traditional lawn mower is internal combustion engine, it result in noise pollution, exist the energy problem and exhaust problem, and increase the pressure of energy.
传统草坪机一般使用内燃机作为动力源，造成了噪音污染，而且还存在能源和排放问题，增加了能源压力。
2
A sound mode technology was proposed for exactly identifying an internal combustion engine's noisesource.
为了准确识别内燃机噪声源，提出了一种声模态分析技术。
3
The performance of an exhaust muffler of internal combustion engine is related not only to the construction of itself, but also to the characters of the exhaust noisesource.