摘要
针对精密可控震源压重在激振作业中振幅过大会导致震源下传能量减小及信噪比降低,而隔振系统对震源压重的振动情况有较大影响,对隔振系统参数进行了优化设计。结合机械系统动力学及半无限空间理论建立震源振动动力学模型,采用压重振幅放大系数作为压重振动幅值大小的评价指标,分析压重振幅与隔震系统参数之间的关系,并利用MATLAB软件分别分析隔振系统刚度、阻尼比等关键参数对它的影响;分析发现隔振系统刚度与阻尼比在激振过程中对压重振幅有着较大的影响,不合理的参数设计会使压重剧烈振动甚至发生共振。在此基础上,基于坐标轮换法设计了相应的优化算法,并得到了扫描频宽范围内不同压重质量下隔振系统刚度和阻尼比的最优参数组合。研究结果表明:优化后的精密可控震源隔振系统压重振动幅值在整个扫描频宽内波动显著减小,振幅最大值较优化前减小了75%。研究结果为精密可控震源隔振系统设计提供了参考和指导,为提升震源能量传递率及信噪比提供了一种新思路。
The excessive amplitude of the weight of accurately controlled routinely operated seismic source(ACROSS)results in lowering output energy and signal to noise ratio(SNR)dur‐ing the excitation.Since the vibration isolation system has a great influence on the weight vibra‐tion,the parameter optimization design is carried out.Based on the theory of mechanical system dynamics and semi‐infinite space,the dynamics model of ACROSS was established.The amplifi‐cation coefficient index was established as the evaluation of the weight amplitude,then the rela‐tionship between the index and the parameters of vibration isolation system was deduced,the in‐fluence of the key parameters such as the stiffness and damping ratio of vibration isolation system on the index was analyzed by MATLAB.It was found that the stiffness and damping ratio of vi‐bration isolation system had a great influence on the amplitude of the weight in the process of ex‐citation.The irrational parameter design may cause weight severe vibration and even resonance.On this basis,the optimization algorithm was designed based on the coordinate alternation method to find the optimal parameter combination between the stiffness and damping ratio under different weight.The results showed that the weight vibration amplitude of optimized ACROSS was significantly reduced in the scanning bandwidth,and the maximum amplitude was reduced by 75%after optimization.The research results provide reference and guidance for the design of ACROSS vibration isolation system and a new way to enhance the energy transfer rate and SNR of ACROSS.
作者
李琴
张凯
黄志强
李刚
郝磊
LI Qin;ZHANG Kai;HUANG Zhi-qiang;LI Gang;HAO Lei(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu 610500,China;Bureau of Geophysical Prospecting INC”China National Petroleum Corporation,Zhuozhou 072750,China)
出处
《工程设计学报》
CSCD
北大核心
2018年第2期180-187,共8页
Chinese Journal of Engineering Design
基金
国家高技术研究发展计划(863计划)资助项目(2012AA061201)
中国石油天然气集团公司重大科技专项(2013E-3808)
关键词
精密可控震源
半无限空间
MATLAB
坐标轮换法
accurately controlled routinely operated seismic source(ACROSS)
semi‐infinite space
MATLAB
coordinate alternation method
