The influential factors of noise for dimethyl ether engine are studied and analyzed through experiments by using method of combustion noise and effective solutions for noise reduction are found out.
选择了燃烧噪声的研究方法，对二甲醚发动机噪声的影响因素进行了试验研究和分析，明确了降低噪声的有效途径。
A nonlinear noise reduction method by local projection using adaptive neighborhood selection is proposed.
提出了一种按照自适应方式选取邻域大小的局部投影降噪算法。
The traditional way of noise reduction by using cable connecting has resulted in problems such as the limit to the mobility of crewmembers and the weakening of the noise reduction ability.
由于现行的车内通话器均采用有线连接和传统的降噪方式，导致了乘员活动范围受限以及降噪能力不强等问题。
L. f. noise can be better attenuated so as to obtain good attenuation characteristics over the entire audible frequency range by using active noise reduction technique in the closed-air type earmuff.
在密闭型耳罩中，利用有源降噪技术可以较好地衰减低频噪声以使整个可听声频率范围内获得良好的衰减特性。
This paper achieves noise reduction by using wavelet packet transform, semisoft shrinkage function, Donoho standard deviation estimate and threshold obtain based on statistics.
计算结果表明：变形统计值与变形监测值吻合较好，统计复相关系数较大，估计标准误差较小。
This paper achieves noise reduction by using wavelet packet transform, semisoft shrinkage function, Donoho standard deviation estimate and threshold obtain based on statistics.
计算结果表明：变形统计值与变形监测值吻合较好，统计复相关系数较大，估计标准误差较小。
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