摘要
提出一种船舶实测辐射噪声信号的调制谱重构仿真方法。对实测信号进行时域波形和调制谱分析,提取螺旋桨旋转周期、叶片数、脉冲宽度、调制深度参数;通过仿真生成调制脉冲幅度参数与调制谱谐波谱线之间关系的对照表,查表确定各螺旋桨叶片的调制脉冲幅度参数;基于上述参数实现船舶实测辐射噪声信号的调制谱重构。仿真结果表明,该重构方法能够较好地保持调制谱第一组特征谐波谱线的频率、谱级相对大小排序等重要信号特征。
An approach to reconstruct and simulate the modulation spectrum of measured ship radiated noise is proposed.The time-domain wave and modulation spectrum of the measured signal are analyzed, which is applied to extract the rotation pe- riod, blade number, pulse width and modulation depth of the propeller.Correspondence table of modulation pulses＇ ampli- tude data and modulation harmonic spectrum lines is generated by simulations.The modulation pulses＇ amplitude parameters are then queried from the table.With these parameters, the modulation spectrum of measured ship radiated noise is recon- structed.Simulation results show that the important features, such as frequency and level order of the first group of modula- tion harmonic spectrum lines, .ere, are well maintained.
出处
《电声技术》
2016年第8期40-43,共4页
Audio Engineering
关键词
船舶辐射噪声
调制谱
重构
仿真
ship radiated noise
modulation spectrum
reconstruction
simulation
