山东大学学报（工学版）
山東大學學報（工學版）
산동대학학보（공학판）
JOURNAL OF SHANDONG UNIVERSITY(ENGINEERING SCIENCE)
2015年
3期
58-64
,共7页
座椅振动%集总经验模式分解%特征提取%能量贡献率%驾乘舒适性
座椅振動%集總經驗模式分解%特徵提取%能量貢獻率%駕乘舒適性
좌의진동%집총경험모식분해%특정제취%능량공헌솔%가승서괄성
seat vibration%ensemble empirical mode decomposition%feature extraction%energy contribution ratio%rid-ing comfort
针对某型液压挖掘机座椅振动加速度信号，应用集总经验模式分解（ensemble empirical mode decomposition， EEMD）方法进行处理，提出以能量贡献率与相关性分析相结合的方法，实现本征模态函数（intrinsic mode func-tion，IMF）中冗余项和伪信号的剔除；并应用连续小波变换（continuous wavelet transform，CWT）对各有效IMF分量进行时频分析，实现振源特征提取和定位。试验分析表明：影响驾乘舒适性的分量主要来源于发动机的发火激励和2阶转动激励，同时缸内气体压力循环作用产生的发动机切向、径向激励力也是一个重要的来源。该方法可有效地实现座椅振源信号的分解、筛选及定位，对于研究挖掘机振动舒适性具有一定的应用价值。
針對某型液壓挖掘機座椅振動加速度信號，應用集總經驗模式分解（ensemble empirical mode decomposition， EEMD）方法進行處理，提齣以能量貢獻率與相關性分析相結閤的方法，實現本徵模態函數（intrinsic mode func-tion，IMF）中冗餘項和偽信號的剔除；併應用連續小波變換（continuous wavelet transform，CWT）對各有效IMF分量進行時頻分析，實現振源特徵提取和定位。試驗分析錶明：影響駕乘舒適性的分量主要來源于髮動機的髮火激勵和2階轉動激勵，同時缸內氣體壓力循環作用產生的髮動機切嚮、徑嚮激勵力也是一箇重要的來源。該方法可有效地實現座椅振源信號的分解、篩選及定位，對于研究挖掘機振動舒適性具有一定的應用價值。
침대모형액압알굴궤좌의진동가속도신호，응용집총경험모식분해（ensemble empirical mode decomposition， EEMD）방법진행처리，제출이능량공헌솔여상관성분석상결합적방법，실현본정모태함수（intrinsic mode func-tion，IMF）중용여항화위신호적척제；병응용련속소파변환（continuous wavelet transform，CWT）대각유효IMF분량진행시빈분석，실현진원특정제취화정위。시험분석표명：영향가승서괄성적분량주요래원우발동궤적발화격려화2계전동격려，동시항내기체압력순배작용산생적발동궤절향、경향격려력야시일개중요적래원。해방법가유효지실현좌의진원신호적분해、사선급정위，대우연구알굴궤진동서괄성구유일정적응용개치。
The measured seat vibration responses of an excavator were firstly processed by ensemble empirical mode de-composition (EEMD).In order to eliminate meaningless and spurious components from the obtained intrinsic mode functions (IMF),a new method combining energy contribution ratio and correlation analysis was proposed.Then the selected “interesting”IMFs with actual physical interpretations were processed by continuous wavelet transform (CWT).Based on time-frequency characteristics of IMFs,the vibration signals corresponding to different excitation sources could be located and identified.The experimental results showed that combustion forces and second-order rota-tion forces of diesel engine contributed mainly to seat vibration,meanwhile,the tangential and radial forces of diesel en-gine caused by circulated gas pressure in cylinder also made contributions.The proposed method could be employed ef-fectively in decomposing,selecting and locating the seat vibration source signals,which was greatly helpful to further study of riding comfort.
