Patent ID: 9494699
Filing Date: 2016-11-15
CPC Classification: G01V

Claim Text:
1. A seismic source signal apparatus for generating a seismic source signal, the apparatus comprising: a seismic source component for coupling a reaction mass to the earth; a controllable valve operatively connected to the seismic source component, the controllable valve including a spool; a displacement sensor configured to estimate a parameter relating to a position of the spool; and a controller controlling the controllable valve with a primary control signal generated by using a model of a response of the controllable valve over a selected operating range, wherein the model is configured to reduce a nonlinearity in flow versus displacement response of the controllable valve, wherein the nonlinearity occurs at a null point at a region of zero valve displacement, and wherein the primary control signal is based at least partially on a relationship defined by: Q=Hydraulic flow through the servo valve; K=Hydraulic flow gain; X P P wherein the model is based at least on information relating to a relationship between flow rate and valve displacement.