船舶辐射噪声信号仿真及评价

Simulation and evaluation of ship radiated noise signals

船舶辐射噪声信号仿真应尽可能多地仿真特定船舶辐射噪声的信号特征,达到具体应用对信号仿真度的要求。对船舶辐射噪声仿真信号进行评价,是调整仿真参数和判定仿真信号是否达到要求的必要步骤。该文给出了一套对实测船舶辐射噪声信号进行重构仿真及评价的方法,仿真过程考虑了信号的听觉、连续谱、调制谱和线谱特征,评价方法对各特征进行指标提取和量化,并通过实测与仿真信号之间的相似度计算评价仿真信号的仿真度。对实测船舶辐射噪声信号进行重构仿真的试验结果显示,仿真信号具有较高的特征仿真度,与计算的仿真度评价数值一致。

Simulation of ship radiated noise signals should exhibit the specified ship radiated noise signals’ features as far as possible in order to meet the fidelity requirement of applications. Evaluation of the simulated ship radiated noise signals is necessary for the correction of simulation parameters and determination if the simulated signals have met the qualification. A method is proposed to reconstruct signals from measured ship radiated noise signals and then evaluate its fidelity. The simulation procedure synthesizes the auditory, continuous spectrum, line spectrum and demodulation spectrum features of the ship radiated noise signals. The evaluation method extracts and quantifies indices of features mentioned above, and evaluates the fidelity of the simulated noise signals by computing the similarity between the measured and simulated noise signals. Experiments are conducted to evaluate the feasibility and validity of this method with measured ship radiated noise signals. The results show that the reconstructed signals are of high simulation fidelity, which is coincident with the evaluated fidelity value.