Experimental Study on Sloshing Characteristics in the Elastic Tank Based on Morlet Wavelet Transform  

作　　者：JIANG Mei-rong ZHONG Wen-jun YU Jian-xing LIU Pei-lin YIN Han-jun WANG Shou-dong MA Yu-xiang 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China [2]Offshore Oil Engineering Co.,Ltd.,CNOOC,Tianjin 300451,China [3]CNOOC Research Institute Co.,Ltd.,CNOOC,Beijing 100028,China [4]Transport Planning and Research Institute,Ministry of Transport,Beijing 100028,China [5]State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China

出　　处：《China Ocean Engineering》2018年第4期400-412,共13页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51609168 and 51239008);the Open Fund of State Key Laboratory of Coastal and Offshore Engineering(Grant No.LP1608);the National Key Basic Research Program of China(Grant No.2014CB046804)

摘　　要：Hydroelastic effect of sloshing is studied through an experimental investigation. Different excitation frequencies are considered with low-fill-depth and large amplitude. Morlet wavelet transform is introduced to analyze the free surface elevations and sloshing pressures. It focuses on variations and distributions of the wavelet energy in elastic tanks. The evolutions of theoretical and experimental wavelet spectra are discussed and the corresponding Fourier spectrums are compared. Afterwards, average values of the wavelet spectra are extracted to do a quantitative study at various points. From the wavelet analysis, sloshing energies are mainly distributed around the external excitation frequency and expanded to high frequencies under violent condition. In resonance, experimental wavelet energy of the elevation in elastic tanks is obviously less than that in the rigid one; for sloshing pressures, the elastic wavelet energy close to the rigid one and conspicuous impulse is observed. It recommends engineers to concern the primary natural frequency and impulsive peak pressures.Hydroelastic effect of sloshing is studied through an experimental investigation. Different excitation frequencies are considered with low-fill-depth and large amplitude. Morlet wavelet transform is introduced to analyze the free surface elevations and sloshing pressures. It focuses on variations and distributions of the wavelet energy in elastic tanks. The evolutions of theoretical and experimental wavelet spectra are discussed and the corresponding Fourier spectrums are compared. Afterwards, average values of the wavelet spectra are extracted to do a quantitative study at various points. From the wavelet analysis, sloshing energies are mainly distributed around the external excitation frequency and expanded to high frequencies under violent condition. In resonance, experimental wavelet energy of the elevation in elastic tanks is obviously less than that in the rigid one; for sloshing pressures, the elastic wavelet energy close to the rigid one and conspicuous impulse is observed. It recommends engineers to concern the primary natural frequency and impulsive peak pressures.

关 键 词：SLOSHING elastic tank wavelet transform free surface elevation PRESSURE 

分 类 号：P7[天文地球—海洋科学]