. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. â range of ship periods maximum allowable force/X ratio 10% of line tension. oj (rad/sec) Period (sec) Figure 11. Force-to-amplitude ratio for 6,000-foot length of wire cable with 40,000-pound load, showing effect of accumulator size. feedback system, also shown in Figure 18, is incorporated to improve the performance of the automatic-centering system by adjusting the position of the cam that operates the boom-position sensor (va
. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. â range of ship periods maximum allowable force/X ratio 10% of line tension. oj (rad/sec) Period (sec) Figure 11. Force-to-amplitude ratio for 6,000-foot length of wire cable with 40,000-pound load, showing effect of accumulator size. feedback system, also shown in Figure 18, is incorporated to improve the performance of the automatic-centering system by adjusting the position of the cam that operates the boom-position sensor (valve 65 ) as a function of boom-tip speed. Traction Unit The traction winch, shown in Figure 14, is of the conventional double-drum, inclined-axis type, using six wraps of line around the drums. Drum liners are interchangeable to allow the use of different types and sizes of line. The drive is by a low-torque, high- speed, hydraulic motor through a reduction gear box and then through a single pinion gear that drives the bull gears on both drums. Designed maximum speed of the line is 60 ft/min at a maximum line pull of 65,000 pounds. The hydraulic circuitry is arranged so that the winch motor can be used as a pump, the main pump as a motor, and the diesel engine with its Jacobs compression brake as an energy-absorbing device (air compressor) to provide controllable dynamic braking during lowering operations. A spring-set, hydraulically released brake designed to stop a runaway load is also incorporated into the unit. Power Unit The diesel-hydraulic power unit is driven by a 743-cubic-inch-displacement, turbocharged Cummins 10. 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 Hu
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