哈尔滨工程大学学报2025，Vol.46Issue(4)：660-666,7.DOI:10.11990/jheu.202302007
快艇螺旋桨线谱特性分析及检测
Analysis and detection of line spectrum of speedboat propeller
陈新华 1李嶷 1郑恩明 1方华 1杨鹤1
作者信息
- 1. 中国科学院 声学研究所,北京 100190
- 折叠
摘要
Abstract
Aiming to obtain the target voiceprint features,a low-frequency analysis record figure(LOFAR)is used to study the spectral lines of the target by processing the experimental data collected from a speedboat in a lake.The spectral characteristics of the speedboat are analyzed under two conditions:when the speedboat is moving steadily and when it is turning rapidly.Furthermore,the performance of the fast Fourier transform(FFT)is ana-lyzed using long-time and short-time data,and its effectiveness is evaluated across different experimental scenarios.An engineering implementation method for performing FFT on long-time data is proposed.The study reveals that the line spectrum of the target shifts with changes in its working conditions.The intensities of the fundamental frequen-cy and harmonic signals in LOFAR exhibit randomness,with many harmonics potentially remaining undetectable.This finding indicates that spectral line detection should rely on either long-time or short-time FFT,depending on whether the target is operating stably or undergoing rapid changes.This study provides theoretical and practical guidance for target detection and recognition.关键词
信号处理/频谱分析/信号检测/水下声信号/螺旋桨/舰船噪声/线谱/低频分析记录图Key words
signal processing/spectrum analysis/signal detection/underwater acoustic signal/propeller/ship noise/line spectrum/low-frequency analysis record figure分类
信息技术与安全科学引用本文复制引用
陈新华,李嶷,郑恩明,方华,杨鹤..快艇螺旋桨线谱特性分析及检测[J].哈尔滨工程大学学报,2025,46(4):660-666,7.
