The Research On Hydraulic Servo Vibroseis Vibration System

Seismic exploration is one of the most mature and widely used geophysical exploration methods.Seismic source is an indispensable part of seismic exploration.The quality of seismic source excitation signal is directly related to the quality of collected data and the difficulty of data interpretation.In order to improve the quality of collected data,reduce false signals in data and increase effective signals in data information,seismic exploration should use seismic sources that stimulate seismic waves to be stable and reliable.The heavy hammer source is simple to operate and convenient to use,but it has little excitation energy and poor repeatability,and is only suitable for shallow seismic exploration.The explosive source has high excitation energy and good excitation waveform,but the inconvenient transportation of the explosive source has great impact on the environment and high cost,so it is not suitable for urban seismic exploration and seismic exploration in sensitive areas.Mini-SOSIE and electromagnetic vibroseis are small in size,convenient in transportation,and have strong topographic adaptability.However,mini-SOSIE have low signal output accuracy and small output power,and electromagnetic vibroseis have small output power.Both of them can only be applied to shallow seismic exploration.Conventional hydraulic vibroseis have high excitation energy and good repeatability,but they are large in volume and mass,inconvenient in transportation,and require high exploration sites.Therefore,they are not suitable for seismic exploration in hilly and urban areas.In this paper,the portable hydraulic servo vibroseis can be well applied to the middle and shallow seismic exploration in urban areas,and the middle and shallow seismic exploration in mountainous and hilly areas with complex terrain,which fills the gap in other application fields of seismic sources.In this paper,the portable hydraulic servo vibroseis excitation system is studied by Amesim simulation software and laboratory experiments.In this paper,two kinds of hydraulic oil circuits are designed for vibration system,and the reference models of two kinds of oil circuit vibration system are established by Amesim software.The main function of the reference model is to screen the oil circuit and provide reference for the actual model.By analyzing the mechanical output variable curve of the reference model vibration mechanism and the oil pressure flow curve,the final oil hydraulic circuit of the shock system is selected.The actual model of vibration system is established and simulated by using oil hydraulic circuit.The simulation shows that the hammer gravity has a great influence on the output of mechanical variables such as displacement,velocity and output of the vibration mechanism.In order to eliminate this influence,PID adjustment function is introduced into the model.PID adjustment function makes closed-loop adjustment on the hammer displacement through the LVDT displacement sensor of the hammer to reduce the influence of the hammer gravity.The simulation results of the actual model with the PID adjustment function are analyzed in detail,and the ideal results are obtained,which guide the research and development of seismic source successfully.Modeling and simulation of air spring vibration isolation system in shock excitation system are carried out in this paper.This paper quantitatively evaluates the vibration isolation effect of the air spring,and provides a reference for the vibration isolation design of the source shock mechanism.The simulation of the vibroseis model provides great help for the research and development of the vibroseis,and the vibroseis prototype is developed with reference to the simulation model.The acceleration and output signals of vibroseis are collected by dynamic signal analyzer and sensor,and the quality of acceleration curve and output curve is evaluated quantitatively.In order to test the performance of the prototype,field tests were carried out in a mine goaf in jingyue,changchun.The terrain conditions of the test site are complex,the terrain is undulating and there are many gullies.The site harsh terrain conditions on the vibroseis off-road ability to put forward high requirements.Through field tests,the off-road performance of the vibroseis prototype is tested well,and the source can be well applied to urban seismic exploration and seismic exploration in mountainous areas and other complex terrain conditions.Portable hydraulic servo vibroseis can fill in the blank of explosive source and large hydraulic servo vibroseis.It has a wide application prospect in middle and shallow seismic exploration and in urban and mountainous areas with complex terrain.In order to improve the quality of vibroseis,some improvements are made to the simulation model.In order to adjust the gravity of the hammer,the additional displacement signal of the controller can affect the output curve of the vibroseis to some extent.In order to reduce this effect,a double acting oil cylinder is added to the shock plate of the original model.In this paper,the output of the improved model variable is analyzed in detail.The signal amplitude of displacement adjustment of the new model is very small,and the frequency sweeping signal is basically unchanged.The force curve quality of the shock mechanism is much better than that of the original model.The model improvement is of guiding significance to the subsequent research and development of seismic source.