基于EEMD和CWT的挖掘机座椅振动分析

doi:10.6040/j.issn.1672-3961.0.2014.335

山东大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (3): 58-64.doi: 10.6040/j.issn.1672-3961.0.2014.335

基于EEMD和CWT的挖掘机座椅振动分析

卢丹^1,2, 周以齐^1,2

1. 山东大学机械工程学院, 山东济南 250061;
2. 高效洁净机械制造教育部重点实验室(山东大学), 山东济南 250061

收稿日期:2014-11-24 修回日期:2015-03-06 发布日期:2014-11-24
通讯作者: 周以齐(1957- ),男,山东济南人,教授,博士,主要研究方向为机械系统动力学,振动噪声控制,虚拟工程. E-mail:yqzhou@sdu.edu.cn E-mail:yqzhou@sdu.edu.cn
作者简介:卢丹(1991- ),女,陕西西安人,硕士研究生,主要研究方向为振动噪声控制与信号处理. E-mail:ludan1991@126.com
基金资助:
济南市高校自主创新计划资助项目(201303073)

Vibration analysis of excavator seat based on EEMD and CWT

LU Dan^1,2, ZHOU Yiqi^1,2

1. School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China;
2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture at Shandong University, Ministry of Education, Jinan 250061, Shandong, China

Received:2014-11-24 Revised:2015-03-06 Published:2014-11-24

摘要/Abstract

摘要： 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 function, 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。

关键词: 能量贡献率, 驾乘舒适性, 特征提取, 集总经验模式分解, 座椅振动

Abstract: The measured seat vibration responses of an excavator were firstly processed by ensemble empirical mode decomposition (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 rotation forces of diesel engine contributed mainly to seat vibration, meanwhile, the tangential and radial forces of diesel engine caused by circulated gas pressure in cylinder also made contributions. The proposed method could be employed effectively in decomposing, selecting and locating the seat vibration source signals, which was greatly helpful to further study of riding comfort.

Key words: seat vibration, ensemble empirical mode decomposition, feature extraction, energy contribution ratio, riding comfort

中图分类号:

TB53

卢丹, 周以齐. 基于EEMD和CWT的挖掘机座椅振动分析[J]. 山东大学学报(工学版), 2015, 45(3): 58-64.

LU Dan, ZHOU Yiqi. Vibration analysis of excavator seat based on EEMD and CWT[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2015, 45(3): 58-64.

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基于EEMD和CWT的挖掘机座椅振动分析

Vibration analysis of excavator seat based on EEMD and CWT

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