基于HHT变换的晃荡实验冲击荷载特性分析研究  

Research on characteristics of experimental sloshing impact load based on HHT

作　　者：杨志勋 徐潜岳 杨钰城[2] 张文首[2] 岳前进 YANG Zhi-xun;XU Qian-yue;YANG Yu-cheng;ZHANG Wen-shou;YUE Qian-jin(College of Mechanical and Electrical Engineering,Harbin Engineering University,Harbin 150001,China;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116023,China;Department of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China)

机构地区：[1]哈尔滨工程大学机电工程学院,哈尔滨150001 [2]大连理工大学运载工程与力学学部工业装备结构分析国家重点实验室,辽宁大连116023 [3]大连理工大学海洋科学与技术学院,辽宁盘锦124221

出　　处：《船舶力学》2020年第11期1393-1401,共9页Journal of Ship Mechanics

基　　金：国家科技重大专项资助项目(2011ZX05026-006-06);中央高校基本科研业务费项目(3072019CFJ0702)。

摘　　要：对于储液舱内的液体晃荡问题,室内模型实验是研究晃荡荷载特征及规律最为有效的研究方法。本文引入HHT(Hilbert-Huang Transform,希尔伯特黄变换)-EMD(Empirical Mode Decomposition,经验模态分解)方法进行晃荡冲击时程的频域特性分析研究,首先采用EMD将晃荡冲击时程分解为多个IMF(Intrinsic Mode Function,本征模态函数),然后通过HHT对IMF分量进行谱分析,结果表明HHT-EMD方法能够用于晃荡冲击时程的分析和处理。此外,由于晃荡冲击时程波动性复杂所产生的IMF分量较多,通过与晃荡实验图像对比分析发现,冲击过程中能量主要集中于高频和低频部分,而且分量中低阶部分代表晃荡现象的高频噪声,次阶分量代表晃荡冲击能量部分,高阶部分代表晃荡液体的运动趋势。在此基础上对晃荡时程进行了去噪声处理。上述方法的引入为晃荡荷载研究提供了有益的参考。In the ocean oil-gas engineering field,the development of FLNG(Floating Liquefied Natural Gas)and LNG(Liquefied Natural Gas)ships has attracted more attention recently,which will play an important role in the LNG(-163℃)marine exploitation and the global transportation.GTT membrane tank is one of key components of FLNG for storing LNG.However,the sloshing problem is considered as a crucial factor in the design of LNG tanks to be partially filled.Considering strong nonlinearity of sloshing load time-history,HHT(Hilbert-Huang Transform)-EMD(Empirical Mode Decomposition)is introduced to make the frequency domain analysis,including signal scale characteristics and instantaneous frequency information based on the data in the largest scale model tank.The results indicate that in the complicated pressure signal,the highest order components represent the high frequency noise,the higher order components carry the most energy of sloshing load and the low order components represent the trend of the sloshing liquid surface.Based on the above results,the pressure signal is reconstructed.The research achievement can serve as a useful reference for the solution of sloshing problems of large-scaled LNG tanks.

关 键 词：模型实验 晃荡 冲击荷载 HHT变换 频域分析 

分 类 号：TV131[水利工程—水力学及河流动力学]