CONTROL SYSTEM FOR MARINE VIBRATORS TO REDUCE FRICTION EFFECTS

摘要

Techniques are disclosed relating to control of seismic sources such as marine vibrators. According to some embodiments, iterative learning control (ILC) systems may be used to control such vibrator including an excitation signal and seismic sources. According to some embodiments, a control unit provides first input signals to the marine vibrator which include an excitation signal and a high-amplitude, low-frequency signal, the latter is operable to decrease friction effects in the marine vibrator. Furthermore local sensor(s) placed in, on, or near a seismic source and/or remote sensors placed in the far-field region to measure the acoustic output of the marine vibrator. The control unit is further configured to generate initial values for a transfer function of the marine vibrator based on the measured acoustic output.

主权项

1. A system, comprising:
a marine vibrator configured to generate acoustic output; and a control unit configured to:
provide first input signals to the marine vibrator, the first input signals including an excitation signal and a high-amplitude, low-frequency signal, wherein the high-amplitude, low-frequency signal is operable to decrease friction effects in the marine vibrator;measure the acoustic output of the marine vibrator; andgenerate initial values for a transfer function of the marine vibrator based on the measured acoustic output.