闫国华,田硕.飞行状态下涡扇发动机风扇音频信号合成[J].声学技术,2020,39(1):87~92 |
飞行状态下涡扇发动机风扇音频信号合成 |
Synthesis of fan audio signals of turbofan engine in flight state |
投稿时间:2019-07-20 修订日期:2019-09-02 |
DOI:10.16300/j.cnki.1000-3630.2020.01.015 |
中文关键词: 涡扇发动机噪声 Heidmann模型 噪声预测 音频合成 |
英文关键词: turbofan engine noise Heidmann model noise prediction audio synthesis |
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中文摘要: |
为了能以快速、低成本的方式获得飞机起飞过程中,噪声适航审定飞越噪声测量点处涡扇发动机风扇部件的音频信号,对该音频信号的合成方式进行了研究,并提出了一种基于Heidmann风扇噪声预测模型的音频信号合成方法。该方法首先将环境参数、涡扇发动机风扇部件的尺寸参数和性能参数输入Heidmann预测模型得到源噪声数据,根据ANP数据库计算得到航迹数据,接着根据航迹数据对源噪声数据进行修正,得到噪声适航审定飞越噪声测量点处噪声数据。将上述数据输入Adobe Audition软件,分别用加法合成法和减法合成法合成单音噪声和宽频噪声,再在该软件中对噪声进行组合拼接,最后得到飞行状态下风扇部件的音频信号。对合成的音频信号进行播放并使用声学测量仪器进行测量,验证了该方法的正确性和有效性。 |
英文摘要: |
In order to obtain the fan audio signals of turbofan engine at the noise measurement point during aircraft take-off in a fast and low-cost way, the synthesis method of the fan audio signals is studied and an audio signal synthesis method based on Heidmann fan noise prediction model is proposed. Firstly, environmental parameters, dimension parameters and performance parameters of the fan components of turbofan engine are input into Heidmann prediction model to obtain source noise data. Then, flight track data are calculated according to ANP database. Then, the source noise data are modified according to flight track data to obtain noise data at the flyover noise measurement point in noise airworthiness certification. The above data are input into Adobe Audition software to synthesize tones and broadband noise by using additive synthesis and subtractive synthesis, and then combine the noise in the software to obtain the audio signal of fan components in flying. Finally, the synthesized audio signal is broadcasted and measured by acoustic measuring instrument, which proves that the method is correct and effective. |
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