| 高鑫,程玉胜.舰船螺旋桨轴频估计中线谱要素提取算法[J].,2010,29(6):443-448 |
| 舰船螺旋桨轴频估计中线谱要素提取算法 |
| A line spectrum element extraction algorithm in ship-propeller-shaft frequency estimations |
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| 中文摘要: |
| 舰船辐射噪声DEMON谱(调制解调谱)线谱要素提取是舰船螺旋桨轴频估计中的关键步骤。现有的线谱提取技术主要用于功率谱线谱检测,侧重于线谱频率的确定,不能满足舰船螺旋桨轴频估计需求。本文根据DEMON谱线谱的特点及人工提取线谱的过程,设计了一种新的线谱要素提取算法,改进了谱峰筛选技术,将多时刻的DEMON线谱基于最大似然估计和谱峰序列相似度加以融合决策,最终确定了线谱频率和幅值(峰值)及边界。通过实际数据验证,此线谱要素提取算法更适用于螺旋桨轴频估计,可提高轴频估计的准确率。 |
| 英文摘要: |
| DEMON line spectrum elements extraction of ship radiated noise is a key step in ship propeller shaft frequency estimation.The existing technique of line spectrum mainly uses in line-spectrum detection of power spectrum and focus on line-spectrum frequencies.This technique is far from sufficient to satisfy the demand of propeller shaft frequency estimation. According to the characteristics of DEMON line spectrum and the process of artificial line spectrum extraction,a new algorithm of line spectrum elements extraction is proposed in the paper.Screening peak technique is improved,line spectrum frequency is determinated form multipe-time peak screening results by maximum likelihood(ML) estimation,and line spectrum amplitude and circumscription are extracted from fusion data of multipe-time spectra. The analyse of the sea test data shows this algorithm meets the propeller shaft frequency estimation demand and the accuracy of frequency estimation can be improved. |
| DOI：10.11684/j.issn.1000-310X.2010.06.008 |
| 中文关键词: 螺旋桨 轴频估计 线谱要素提取 最大似然估计 |
| 英文关键词: Propeller Shaft frequency estimation Line spectrum elements extraction ML estimation |
| 基金项目: |
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| 摘要点击次数: 2472 |
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