Abstract
In order to study the influence of floating raft isolation system (FRIS) on the vibration characteristics of marine pump, a marine centrifugal pump with/without FRIS under the same operation condition, which specific speed is 66.7, was experimentally measured. The maximum efficiency of the pump is 75.8%, which is under 1.2 Qd. Results show that the characteristic frequencies in the vibration spectrums of the pump with/without FRIS are APF (axial passing frequency), the BPF (blade passing frequency) and its high-order harmonic frequency. After installing FRIS, under 0.8 Qd, 1.0 Qd and 1.2 Qd, the vibration intensity of the pump at inlet flange is slighter than that at pump base and larger than that at pump bracket. The vibration intensity at outlet flange is slighter than that at the pump bracket and larger than that at pump body, and the vibration intensity at connecting plate is the lowest. The vibration velocity level of pump base decreases with the increase of flow rate, the maximum vibration intensity at M1–M4 is reduced by 88% than that without FRIS, and the maximum vibration velocity of the APF at M1–M4 is reduced by 83.3% than that without FRIS.
Highlights
As vessels in the ship system, marine centrifugal pumps are widely used in the ship’s bilge ballast system, cooling water system, fire protection system, drainage system, circulating water system, and so on.[1]
The marine pump performance with floating raft isolation system (FRIS) is experimented in the closed experiment bench shown in Figure 2, which is mainly composed of signal data acquisition instrument, electromagnetic flowmeter, gate valve, water tank, pressure sensors, motor, marine pump, FRIS, base and computer
The maximum vibration velocity at the main frequency is reduced from 0.24 mm/s to 0.04 mm/s, and the vibration energy is reduced by 83.3%, which indicates that FRIS has a significant influence on the reducing the vibration velocity level
Summary
As vessels in the ship system, marine centrifugal pumps are widely used in the ship’s bilge ballast system, cooling water system, fire protection system, drainage system, circulating water system, and so on.[1]. Structure of the pump with FRIS is shown, which contains floating raft, vibration isolator, connecting plate, pump and motor. The marine pump performance with FRIS is experimented in the closed experiment bench shown, which is mainly composed of signal data acquisition instrument, electromagnetic flowmeter, gate valve, water tank, pressure sensors, motor, marine pump, FRIS, base and computer.
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