Seismic vibrator

This provides an increase in source efficiency and consequently a cost saving for acquisition. The addition of Vibrator Auto-Guidance optimizes vibroseis productivity in two ways. This reduces both its travel time between VPs and any operator-induced delays. Additional time is saved by reducing dead time spent on deploying and recovering the baseplate. The descent of the baseplate is anticipated by the system and commences before the truck has come to a complete standstill. By positioning the Nomad vibrator with the highest degree of accuracy within 1 m of the surveyed position , the Vibrator Auto-Guidance also ensures that the data collected is of the highest possible quality.
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Dynamic Characteristics Analysis of a Seismic Vibrator-Ground Coupling System

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Seismic vibrator - Wikipedia

The seismic vibrator has become a main energy source for land seismic exploration. For a seismic vibrator, a piston is installed in the vertical direction in the reaction mass, and the reaction mass moves up and down along the piston. Because of vibrator dynamic disturbances in the reaction mass and baseplate system, the vibrator output force is contaminated by harmonic distortion. This distorted output force results in poor quality of seismic data. This paper studies the dynamics and disturbances of the piston as well as the reaction mass. The results show that the reaction mass disturbance is mainly caused by the horizontal oil flow inlet going to the reaction mass chamber. Precisely speaking, the ideal vertical motion of the reaction mass is disturbed by a combination of a reaction mass rotational motion along the piston and a bending motion of the piston.
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Seismic vibrator

A mathematical model to describe the seismic vibrator and ground coupling is proposed based on dynamic analyses of the vibrator baseplate structure and properties of soil. It produces reasonable results and the trend of amplitude envelope follows the experimental data. With this model, characterization of the vibrator-ground coupling is performed. Modal analysis study shows that the motions between the vibrator reaction mass and baseplate experience a combination of a first-order vibration mode and a second-order vibration mode. The corresponding frequencies of two vibration modes are located at 2.
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A seismic vibrator is a truck-mounted or buggy-mounted device that is capable of injecting low-frequency vibrations into the earth. It is one of a number of seismic sources used in reflection seismology. Today, seismic vibrators are used to perform about half of all seismic surveys on land.
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