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工程设计学报
Chinese Journal of Engineering Design  2018, Vol. 25 Issue (2): 180-187    DOI: 10.3785/j.issn.1006-754X.2018.02.008
    
Parameter optimization design for vibration isolation system of accurately controlled routinely operated seismic source
LI Qin1, ZHANG Kai1, HUANG Zhi-qiang1, LI Gang1, HAO Lei2
1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;
2. Bureau of Geophysical Prospecting INC., China National Petroleum Corporation, Zhuozhou 072750, China
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Abstract  

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) during the excitation. Since the vibration isolation system has a great influence on the weight vibration, 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 amplification coefficient index was established as the evaluation of the weight amplitude, then the relationship between the index and the parameters of vibration isolation system was deduced, the influence 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 vibration isolation system had a great influence on the amplitude of the weight in the process of excitation. 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.

Key words： accurately controlled routinely operated seismic source(ACROSS)      semi-infinite space      MATLAB      coordinate alternation method     
Received: 11 May 2017      Published: 28 April 2018
CLC:  TE19  
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LI Qin
ZHANG Kai
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LI Gang
HAO Lei
Cite this article:

LI Qin, ZHANG Kai, HUANG Zhi-qiang, LI Gang, HAO Lei. Parameter optimization design for vibration isolation system of accurately controlled routinely operated seismic source. Chinese Journal of Engineering Design, 2018, 25(2): 180-187.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2018.02.008     OR     https://www.zjujournals.com/gcsjxb/Y2018/V25/I2/180


精密可控震源隔振系统参数优化设计

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。


关键词： 精密可控震源,  半无限空间,  MATLAB,  坐标轮换法 

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