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Modeling And Modal Analysis Of Vibrator Mechanical SystemNormal access

Author: Z. Wei
Event name: EAGE Vibroseis Workshop - Vibroseis acquisition and processing half century later, new developments in data quality and productivity
Session: Session 1: Vibroseis Engineering
Publication date: 13 October 2008
DOI: 10.3997/2214-4609.20147508
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 421.83Kb )
Price: € 20

Modern seismic vibrators are essentially hydro-mechanical systems driven by a servo-valve
that is electronically controlled. A schematic cross-section of the reaction mass, the baseplate
assembly and a hydraulic power supply system are shown in Figure 1. The piston, which is a
part of the baseplate driven structure, is rigidly connected to the baseplate pad. The piston
moves in a cylindrical bore inside the reaction mass and divides the cylinder into an upper
chamber and a lower chamber. High-pressure hydraulic oil fed alternately into the upper and
lower chambers drives the reaction mass up-and-down. The force acting on the reaction mass
is equally and oppositely applied to the piston. Through the baseplate structure the force is
transmitted into the ground.

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