基于峰度检验和小波包分解的海洋平台脉冲噪声处理方法研究

海洋平台处于复杂的环境中,不仅受到风浪流的作用,而且还受到平台本身各种机器运转的影响,所以在平台上采集的信号一般都不可避免地包含大量噪声.其中,脉冲噪声是振动响应数据处理中经常遇到的干扰,严重影响了后续损伤敏感特征的提取.为了更好地消除脉冲噪声对特征提取的不利影响,引入了一种峰度检验和小波包阈值联合的降噪方法.将测得的...

Impulse noise processing for an offshore platform based on kurtosis detection and wavelet packet decomposition

The offshore platform is exposed in harsh environment,which is not only influenced by the wind,waves and currents,but also by the equipments on the platform.As a consequence,the response data measured on the platform contains a lot of noise inevitably.The impulse noise is a common kind of noise in the process of data processing,which seriously affects the subsequent extraction of damage-sensitive features.Thus,a method combinedly using kurtosis detection and wavelet packet threshold was proposed in order to eliminate the adverse effects of impulse noise effectively in feature extraction.First,the kurtosis of the measured responses was tested to determine the influence range of impulse noise.Then,the signal in the range was processed by a de-noising method based on wavelet packet decomposition.Finally,the de-noised signal was obtained by reconstructing the wavelet packet coefficients.Based on the measured data of a jacket platform in service,the effectiveness of the de-noising method proposed was verified.