卵石碰撞的声学特征分析  

Analysis of acoustic features of pebble collision

作　　者：薛飞龙 宋丹丹[1] 杜思材 

机构地区：[1]重庆交通大学河海学院,重庆400074

出　　处：《人民长江》2018年第1期95-98,102,共5页Yangtze River

基　　金：重庆市研究生科研创新项目(CYS16175)

摘　　要：探究卵石推移质运动机理对研究河床演变、水库淤积、航道整治等方面意义重大,但现有卵石运动观测技术存在诸多局限性而无法满足实际需求。由于声波在水中传播具有独特优势,基于音频分析研究卵石粒径、碰撞速度对其声学特征的影响,分析音频信号中的时域、频域参数信息,初步探索卵石碰撞声学特征与自身物理特征间的相互关系并提取关键声学特征参数。分析结果表明,波形指标、峰值因子、功率谱密度峰值和频能比与卵石粒径呈正相关性,碰撞速度对波形指标、功率谱密度峰值影响较大。Study on the movement mechanism of pebble bedload is significant to riverbed evolution forecast, reservoir sedimen- tation research and waterway regulation engineering. However, there are many limitations in the existing pebble movement obser- vation technology. Due to the unique advantages of sound wave propagation in water, the audio analysis was used to study the effects of particle size and collision velocity on acoustic features of pebble. Besides, the time domain and frequency domain pa- rameters of the audio signal are analyzed. Furthermore, the relationship between the acoustic features of pebbles and its own physical characteristics was investigated, and the key acoustic parameters were extracted. The research results showed that the waveform parameters, peak factor, peak of power spectral density and frequency energy ratio were positively correlated with the pebble size. Moreover, the collision speed has exerted a relatively large influence on the waveform index and peak power spectral density.

关 键 词：卵石碰撞 音频分析 波形指标 功率谱密度峰值 频能比 卵石推移质 

分 类 号：TV85[水利工程—水利水电工程]