Rotation jitter control method in azimuth thruster hydraulic system

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (1) : 180-186.

WU Zhe, LI Baoren, YANG Gang, GAO Longlong

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Abstract

Aimed at the rotation jitter phenomenon in the hydraulic system of azimuth thruster, a simulation model of the rotary hydraulic system with counterbalance valves was built based on AMESim，the influence of the counterbalance valve’s maximum throttle flow rate and spool stroke-flow area characteristics on its dynamic characteristics were analyzed. The simulation results show that periodic fluctuation of the control pressure of the counterbalance valve will lead to fluctuations in the spool position and flow area, which is the root cause of rotation jitter in the hydraulic system with counterbalance valves. When the maximum throttling flow rate of the CB series counterbalance valve is slightly less than or equal to the system design flow rate, the slewing action is more likely to achieve better smoothness. When the design flow rate of the hydraulic system with the counterbalance valve is less than the maximum throttling flow rate of the counterbalance valve, the larger the flow area gradient of the CB series counterbalance valve，the more severe of the rotation jitter, and vice versa, the smoother the slewing action, so the full throttle type counterbalance valve is easier to obtain smoothness, but this is at the expense of the loss of slewing speed. The large effective spool stroke of the MBE* improved counterbalance valve effectively reduces the sensitivity of the flow area to spool stroke, resulting in good stability at low system flow rates and low pressure loss at higher design flow rates.

Key words

Azimuth thruster / Counterbalance valve / Rotation jitter / Control method

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WU Zhe, LI Baoren, YANG Gang, GAO Longlong. Rotation jitter control method in azimuth thruster hydraulic system[J]. Journal of Vibration and Shock, 2022, 41(1): 180-186

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