. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. range of ship periods. n r U^ Hj maximum allowable force/X ratio 10% of line tension 1,000 feet Period (sec) Figure 12. Force-to-amplitude ratio for 6,000-foot length of nylon rope with 40,000-pound load, 5% accumulator size. diesel, rated at 250 bhp at 2,100 rpm, which drives both a main hydraulic pump that powers the traction winch and auxiliary pumps that drive the other system components. The engine is fitted with a Jacobs compressio
. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. range of ship periods. n r U^ Hj maximum allowable force/X ratio 10% of line tension 1,000 feet Period (sec) Figure 12. Force-to-amplitude ratio for 6,000-foot length of nylon rope with 40,000-pound load, 5% accumulator size. diesel, rated at 250 bhp at 2,100 rpm, which drives both a main hydraulic pump that powers the traction winch and auxiliary pumps that drive the other system components. The engine is fitted with a Jacobs compression brake which, when activated, converts the engine into a compressor capable of absorbing almost as much power as the normal out- put rating. When the unit operates in this mode, auxiliary hydraulic pumps continue to be driven and all system functions remain operable. Turntable Unit The motion-compensating, traction, and power components are all mounted on a turntable capable of 360-degree rotation controlled by the operator to allow offloading or onloading from the support-vessel deck. The turntable also permits the placing of the boom tip at the most advantageous position with respect to the ship for a lifting or lowering operation. Line-Storage Unit The line-storage unit is shown to the right in Figure 13 and in detail in Figure 15. It is capable of storing 7,000 feet of 3-inch-diameter nylon line (volume limit) or 7,000 feet of 1-1/2-inch-diameter wire rope (weight limit). Line tension during haul-in or payout is selected by the operator and auto- matically controlled to a level between 0 and 2,000 11. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hallanger, Lawrence W; Brackett, R. L; Naval Construction Battalion Center (Port Hueneme, Calif. ). Civil Engineering Laboratory. Port Hueneme, Calif. : Nava
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