f Modeling And Modal Analysis Of Vibrator Mechanical System

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