Abstract
Seawater hydraulic piston pump has been widely used in ocean engineering and become a key power component for underwater equipment due to its inherent characteristic such as energy conservation and environment friendly. As one of the most important properties of seawater hydraulic piston pump, vibration would further determine the stability, reliability and stealth of underwater equipment. In this paper, the dynamic of a novel crankshaft seawater piston pump with gearbox are analyzed theoretically, illustrating the dramatically effect of the gearbox on the vibration characteristic of the seawater hydraulic piston pump. Then, a new type crankshaft seawater hydraulic piston pump system driven by a permanent magnet synchronous motor instead of asynchronies motor is proposed in order to eliminate the gearbox and improve the vibration characteristics. In addition, the vibration characteristic of this new type crankshaft seawater hydraulic piston pump system driven by asynchronous motor and permanent magnet synchronous motor are studied and compared experimentally. The experiment results indicate that the seawater hydraulic piston pump system driven by permanent magnet synchronous motor eliminating the gearbox has lower vibration acceleration level in comparison with the pump system driven by asynchronous motor and gearbox. The vibration acceleration level can be reduced from 7dB to 4.3dB. Driving the seawater hydraulic piston pump by permanent magnet synchronous motor instead of asynchronous motor is of benefit to eliminating the gearbox and reducing the vibration excitation source. Consequently, the vibration characteristic of the seawater hydraulic piston pump system driven by a permanent magnet synchronous motor is significantly improved.
Highlights
Water hydraulics possesses the advantages of little environment pollution, nonflammable, lower operating cost and so on because it directly uses natural water as working medium instead of traditional mineral oil [1,2,3]
It is more flexible in underwater application to build opencircuit system directly utilizing the seawater as working medium and discharging drainage to the open surroundings without needing return hose and reservoir. These special characteristics make it widely used in underwater equipment, such as variable ballast system (VBS), bilge drainage system, high pressure water mist fire suppression system, high pressure waterjet propulsion system, etc. [4,5,6,7,8]
Reducing the vibration of seawater hydraulic piston pump system has become the primary strategy to improve the overall performance of water hydraulics system and underwater equipment [10,11]
Summary
Water hydraulics possesses the advantages of little environment pollution, nonflammable, lower operating cost and so on because it directly uses natural water as working medium instead of traditional mineral oil [1,2,3]. Reducing the vibration of seawater hydraulic piston pump system has become the primary strategy to improve the overall performance of water hydraulics system and underwater equipment [10,11]. Optimizing the structure and modifying the stiffness and damping of the hydraulic piston pump to change its dynamic behavior is another significant method to reduce the vibration of hydraulic piston pump [10, 14, 18,19]. Xu et al [10, 31] optimized the valve-plate transition region, including relief grooves and timing to reduce the pressure pulsation, vibration and noise of hydraulic piston pump, and presented several new design methods of the valve plate. The comparison of the vibration characteristic between the pump system driven by permanent magnet synchronous motor and asynchronous motor was conducted to identify the advantage of the pump system driven by permanent magnet synchronous motor directly without gearbox
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