| Modeling, Simulation, Analysis and Decision |
|
|
|
|
| Research on vibrator-ground coupling dynamic stiffness and dynamic damping under excitation of sweep signal |
| LI Gang1, XU Guang-ming1, HUANG Zhi-qiang1, QI Wen1, 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 |
|
|
|
Abstract The key to study the vibration excitation law of seismic vibrator is to accurately describe the interaction between vibrator and ground under sweep signal excitation. According to the elastic half space theory, a vibrator-ground coupling vibration model was established, the mathematical description of vibrator-ground coupling dynamic stiffness and dynamic damping was carried out, the model test was carried out, and the influence law of coupling parameters on dynamic stiffness and dynamic damping was studied. The results showed that the coupling parameters affecting dynamic stiffness and dynamic damping included sweep frequency, soil elastic modulus, soil density and plate bottom area; the interaction between the plate and the ground decreased with the increase of sweep frequency; the interaction between the soil with larger elastic modulus and lower density and the plate was relatively stronger, which was more conducive to vibration output, while the effect of increasing the plate bottom area on improving the dynamic stiffness decreased with the increase of sweep frequency. When using seismic vibrator for exploration, the effects of sweep frequency, soil properties and plate bottom area on dynamic stiffness and dynamic damping should be considered to obtain the desired seismic excitation signal.
|
|
Received: 06 September 2020
Published: 28 August 2021
|
|
|
扫描信号激振下振动器-大地耦合动刚度和动阻尼研究
准确描述在扫描信号激振下振动器与大地之间的相互作用是研究可控震源激振规律的关键。根据弹性半空间理论，建立了振动器-大地耦合振动模型，提出了振动器-大地耦合动刚度和动阻尼的数学描述，进行了耦合模型的试验验证，研究了耦合参数对动刚度和动阻尼的影响规律。结果表明，影响动刚度和动阻尼的耦合参数包括扫描频率、大地弹性模量、土壤密度和平板底面积；平板和地面之间的相互作用随着扫描频率的提高而减弱；弹性模量较大、密度较小的土壤与平板之间的相互作用较强，更有利于振动出力，而加大平板底面积对增大动刚度的作用随着扫描频率的提高而减弱。采用可控震源进行勘探作业时，应考虑扫描频率、土壤性质、平板底面积对动刚度和动阻尼的影响，以获得期望的地震激发信号。
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
