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工程设计学报
工程设计学报  2019, Vol. 26 Issue (6): 658-665    DOI: 10.3785/j.issn.1006-754X.2019.00.013
保质设计     
震源振动器平板损伤机理及其疲劳寿命预测研究
陈振, 周阳, 敬爽, 黄志强, 陈言
西南石油大学 机电工程学院， 四川成都 610500
Study on damage mechanism and fatigue life prediction of seismic vibrator baseplate
CHEN Zhen, ZHOU Yang, JING Shuang, HUANG Zhi-qiang, CHEN Yan
School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
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摘要： 振动器是可控震源地震信号激发的关键装置，长期宽、高频地震波激发致使振动器平板焊接部位出现裂纹甚至疲劳失效，这不仅会大大减短平板工作寿命，而且严重影响震源信号质量。由此，对平板开裂断口的微观形貌进行分析，掌握平板疲劳损伤区域内损伤特征、裂纹扩展规律，揭示平板开裂断口损伤机理。针对平板疲劳损伤模式和特点，开展平板“三点弯曲”疲劳试验，拟合平板S—N曲线，预测平板疲劳寿命，并与采用断裂力学法的疲劳寿命计算结果进行比较。结果表明，经疲劳试验参数修正的S—N曲线法的精度高于断裂力学法，可准确预测震源振动器平板的工作寿命。研究成果为延长震源振动器平板的疲劳寿命、增强其可靠性提供了科学的理论支持，有助于提高我国油气勘探技术及相关工程装备的研发水平和国际竞争力。
关键词： 振动器平板;  损伤机理;  疲劳寿命;  疲劳试验分析    
Abstract: The vibrator is the key device for the excitation of the seismic signal of vibroseis. Long-term wide and high-frequency seismic wave excitation causes cracks or even fatigue failure in the welded part of the vibrator baseplate, which will not only greatly reduce the working life of the baseplate, but also seriously affect the source signal quality. Therefore, the micromorphology of the baseplate cracking fracture was analyzed. The damage characteristics and crack propagation law of the fatigue damage area of the baseplate were grasped, which revealed the damage mechanism of the baseplate cracking fracture. According to the fatigue damage mode and characteristics of the baseplate, the "three-point bending" fatigue test of the baseplate was carried out, and the S-N curve of the baseplate was fitted. The fatigue life of the baseplate was predicted, and compared with the fatigue life calculated by the fracture mechanics method. The results showed that the S-N curve method modified by fatigue test parameters was more accurate than the fracture mechanics method, and it could accurately predict the working life of the seismic vibrator baseplate. The research results provide scientific theoretical support for prolonging the fatigue life of seismic vibrator baseplate and enhancing its reliability, which will significantly enhance the research and development level and international competitiveness of China's oil and gas exploration technology as well as the related engineering equipment.
Key words: vibrator baseplate    damage mechanism    fatigue life    fatigue test analysis
收稿日期: 2019-03-26 出版日期: 2019-12-28
CLC:  TH 122  
基金资助: 国家自然科学基金青年基金资助项目（41802198）
作者简介: 陈振(1985—)，男，湖北黄冈人，副教授，硕士生导师，博士，从事振动器关键部件疲劳行为分析等研究，E-mail：117976897@qq.com，https://orcid.org/0000-0002-3595-1645
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引用本文:

陈振, 周阳, 敬爽, 黄志强, 陈言. 震源振动器平板损伤机理及其疲劳寿命预测研究[J]. 工程设计学报, 2019, 26(6): 658-665.

CHEN Zhen, ZHOU Yang, JING Shuang, HUANG Zhi-qiang, CHEN Yan. Study on damage mechanism and fatigue life prediction of seismic vibrator baseplate. Chinese Journal of Engineering Design, 2019, 26(6): 658-665.

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https://www.zjujournals.com/gcsjxb/CN/10.3785/j.issn.1006-754X.2019.00.013    或    https://www.zjujournals.com/gcsjxb/CN/Y2019/V26/I6/658

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