Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Offshore prospecting
Patent
1986-09-22
1987-04-21
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Offshore prospecting
367 20, 367130, 367154, G01V 138, H04R 144
Patent
active
046601830
ABSTRACT:
A technique for a vibration isolation module (VIM) used for towed arrays is disclosed. The VIM has a stretchable cable on which is mounted one or more rigid spacers which make contact with an outer hose formed of a flexible material having a selected vibration attenuation characteristic. The spacer transmits energy between the parts of the VIM which contact the spacer for attenuation purposes. The spacer is "soft mounted" on the stretchable cable so that it may be moved by a limited amount along the cable in response to forces of a specified minimum magnitude. This ability to move allows adjustment of the internal parts of the VIM during use to avoid concentrating stress at any one particular contacting area. Disclosed is an embodiment where two sleeves are used to abut the spacer at opposing ends thereof. The sleeves are clamped to the stretchable cable with a limited clamping force such that they remain stationary until the spacer is exposed to the predetermined breakaway force and/or the stretchable cable cross-sectional size decreases by a predetermined amount.
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MacCulloch David B.
McGowan George A.
Eldred John W.
Hughes Aircraft Company
Jordan Charles T.
Karambelas Anthony W.
Runk Thomas A.
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