涡街流量信号背景噪声的混沌特性研究  

Research on the Chaos Performance of Noise in Vortex Flow Signal

作　　者：宋磊[1] 陈洁[1] 李斌[1] 

机构地区：[1]上海大学机械工程与自动化系,上海200072

出　　处：《计量学报》2005年第2期155-158,共4页Acta Metrologica Sinica

摘　　要：首先介绍涡街发生的原理,分析了涡街噪声信号的产生具有混沌特性的可能性,引入小波方法分解涡街流量信号,运用混沌理论对涡街背景噪声信号的Lyapunov指数进行了计算仿真,结果表明涡街噪声信号是具有混沌特性的,并提取了涡街噪声信号的混沌特征,计算了盒维数。为定性地研究涡街流量信号特征提出了新的思路,实验数据的仿真结果说明了该方法的有效性。The chaos theory is introduced for studying the performance of vortex noisy signal. The possibility that vortex noisy signal should be in possession of chaos characteristic is firstly analyzed. The vortex noisy signal is obtained by decomposing the vortex flow signal with the wavelet transform, and then simulation computation is used on the Lyapunov exponent of vortex noisy signal by the chaos theory. Its result approves that vortex noisy signal has chaos characteristic. Finally, the chaos characteristic of vortex noisy signal is picked up by calculating its box-dimension. The simulation result demonstrates the feasibility of research on performance of vortex noisy signal by chaos theory.

关 键 词：计量学 涡街 流量信号 噪声 混沌 

分 类 号：TB937[一般工业技术—计量学]