. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. 1-2| 1— |-" 1 range of ship periods 1—^ \. oj (rad/sec) Period (sec) Figure 10. Response ratio of nylon rope, showing effect of length. manner. In the automatic mode, valve 60A is in the center (off) position, and valve 60B is in the auto- matic position (as shown). Oil is supplied to the circuit from the hydraulic source via the pressure regulator 67A and the pressure-compensated flow- control valve 66. With the boom tip ab
. Development and evaluation of a motion compensating lift system for deep ocean construction. Underwater construction; Marine engineering; Civil engineering. 1-2| 1— |-" 1 range of ship periods 1—^ \. oj (rad/sec) Period (sec) Figure 10. Response ratio of nylon rope, showing effect of length. manner. In the automatic mode, valve 60A is in the center (off) position, and valve 60B is in the auto- matic position (as shown). Oil is supplied to the circuit from the hydraulic source via the pressure regulator 67A and the pressure-compensated flow- control valve 66. With the boom tip above midpoint, valve 65 supplies oil to accumulator bank 63D through F while simultaneously releasing oil from accumulator bank 63A through C through flow- control valve 64 and back to the main reservoir. When the boom position moves to below the midpoint, the oil supply is shifted to 63A through C while 63D through F are connected to the drain. If the average boom position is at the midpoint, the pressures in the two accumulator banks remain equal. If, however, the average boom position should move away from midpoint, one accumulator bank would receive more oil and, thus, have a higher pressure than the other. When the required pressure difference is reached, valve 61 is activated, turning on both the appropriate gas-transfer valves 19A through D and the compressor, to transfer gas in the direction necessary to bring the average boom position back to midpoint. Control-system response time is governed by both the relative and absolute settings of valves 64A through 66, and pressure regulator 67A. For manual control, valve 60A bypasses the boom-controlled valve and the flow-control valves 64C and 66. A boom-velocity. 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; Nav
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Keywords: ., bookcentury1900, booksubjectcivilengineering, booksubjectmarinee
