helicopter noise meaning in Chinese
直升机噪音
Examples
- 2 . analysis of the helicopter noise signature
对空气中的直升机噪声进行了分析。 - For a conventional helicopter , the tail rotor is one of primary sources for helicopter noise
尾桨是直升机的主要噪声源,降低尾桨噪声对控制直升机的噪声水平具有重要意义。 - A sorting method of the helicopter noise sources is given . the temporal waveform and spectrum of the noise signature is analyzed . at last , the sound pressure spectrum density level is estimated with the experimental data taken from a specific navy helicopter
扼要阐述了直升机噪声的产生和分类，考察了直升机信号的波形和频谱特征，并对特定的直升机噪声的声压谱密度级进行了计算。 - Since the spectrum of the helicopter noise contains wide band continuous component and narrow band line component , we can use the wide band signal detection method or narrow band signal detection method . both detection methods are discussed
直升机噪声既含有宽带连续谱成分，又有很强的窄带线谱分量。根据直升机噪声的特点，我们既可以采用宽带能量检测，又可以采用窄带线谱来检测直升机信号。 - In this thesis , the major contributions of the author ’ s research work are as follows : at first , the classification of helicopter tail rotor noise sources and the existent method of helicopter noise research is introduced briefly
本文采用谐波分析法对直升机前飞状态下的尾桨噪声进行了理论分析研究。主要工作包括:本文首先简要介绍了直升机噪声的分类以及国内外直升机噪声研究方法的现状,总结了前人的研究成果。