Analysis of Vibration Characteristics Induced by Water Hammer of Ship’s Longitudinal Inclination and Balance System

2020 ◽  
Vol 10 (04) ◽  
pp. 34-43
Author(s):  
宗和 周
Keyword(s):  
Water Hammer ◽  
Vibration Characteristics ◽  
Balance System

Study on Vibration Characteristics of Fracturing Piping in Pump-Starting and Pump-Stopping Water Hammer

2019 ◽  
Vol 19 (4) ◽  
pp. 1093-1104 ◽  
Author(s):  
Yinping Cao ◽  
Yihua Dou ◽  
Yuxi Huang ◽  
Jiarui Cheng
Keyword(s):  
Water Hammer ◽  
Vibration Characteristics

Water Hammer Characteristic of the Pipeline in Ship Pitch Balance System

2013 ◽  
Vol 341-342 ◽  
pp. 400-405
Author(s):  
Li Kun Peng ◽  
Yang Yang Zhang ◽  
Liang Qin Yu
Keyword(s):  
Mathematical Models ◽  
Water Hammer ◽  
Ball Valve ◽  
Flow Area ◽  
Balance System ◽  
Water Shift ◽  
Before And After ◽  
Simulation Results ◽  
Ship Pitch ◽  
Impact Characteristics

In ship pitch balance system, serious flow impact and water hammer occur because of the turning on and off of valve during the procedure of water-shift. Flow area of the ball valve used most on ship was derived, and mathematical models of pressure lost before and after valve were formulated. Besides, considering the fact of water-shift balance system, an AMESim model was established based on improved traditional throttle model. And the validity of AMESim model was ascertained by comparing simulation results of stable pressure before and after valve with calculated values from mathematical models. Then, with the AMESim model, impact characteristics of water-shift pipeline were investigated when adopting various valve switch rules, length of pipelines before and after valve and using an accumulator in system. From that, methods to reduce pipeline impact were proposed, which make good references for noise control of ship pitch balance system.

Water Hammer Control of Ship’s Trim Balance System

2021 ◽  
Author(s):  
Lingbo Zhou ◽  
Zhikuan Hu ◽  
Yudong Sun ◽  
Yong Duan
Keyword(s):  
Water Hammer ◽  
Balance System

An Experimental Study to Predict Dynamic Performance of Check Valve by Water Hammer

2019 ◽  
Vol 19 (1) ◽  
pp. 1-12
Author(s):  
Tae-Kook Park ◽  
Yong-Bum Lee ◽  
Jae-Hyeong Kim ◽  
Ki-Chun Lee ◽  
Dong-Cheon Baek
Keyword(s):  
Experimental Study ◽  
Dynamic Performance ◽  
Check Valve ◽  
Water Hammer

Characterisation of the Humming-Type Noise and Vibration of the Automotive HVAC System

2019 ◽  
Vol 16 (2) ◽  
pp. 6634-6648
Author(s):  
A. Z. A. Mazlan ◽  
M. H. A. Satar ◽  
M. H. Hamdan ◽  
M. S. Md. Isa ◽  
S. Man ◽  
...  
Keyword(s):  
Vibration Characteristics ◽  
Operating Conditions ◽  
Hvac System ◽  
Frequency Range ◽  
Noise And Vibration ◽  
Power Steering ◽  
Pump Compressor

The automotive heating and ventilating air condition (HVAC) system, when vibrating, can generate various types of noises such as humming, hissing, clicking and air-rushes. These noises can be characterised to determine their root causes. In this study, the humming-type noise is taken into consideration whereby the noise and vibration characteristics are measured from various HVAC components such as power steering pump, compressor and air conditional pipe. Four types of measurement sensors were used in this study - tachometer for rpm tracking; accelerometer for the vibration microphone for the noise; and sound camera for the visualization measurement. Two types of operating conditions were taken into consideration - they were “idle” (850 rpm) and “running” (850-1400 rpm) conditions. A constant blower speed was applied for both conditions. The result shows that the humming noises can be determined at the frequency range of 300-350 Hz and 150-250 Hz for both idle and running conditions, respectively. The vibration of the power steering pump shows the worst acceleration of 1.8 m/s2 at the frequency range of 150-250 Hz, compared to the compressor and air conditional pipe. This result was validated with the 3D colour order and sound camera analyses, in which the humming noise colour mapping shows dominance in this frequency range.  

Influence of Rotor Eccentricity on Vibration Characteristics of Permanent Magnet Synchronous Motor

2018 ◽  
Vol 138 (9) ◽  
pp. 730-738
Author(s):  
Ryoichi Takahata ◽  
Shinichi Wakui ◽  
Kenji Miyata ◽  
Keiji Noma ◽  
Masaharu Senoo
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Vibration Characteristics ◽  
Rotor Eccentricity

Aerodynamic Characteristics of Turbojav Measured with 1-m Magnetic Suspension and Balance System

2021 ◽  
Author(s):  
Hiroyuki Okuizumi ◽  
Kasumi Sasaki ◽  
Yasfumi Konishi ◽  
Shigeru Obayashi
Keyword(s):  
Aerodynamic Characteristics ◽  
Magnetic Suspension ◽  
Balance System

Simulation of water hammer phenomena using the system code ATHLET

Kerntechnik ◽  
2017 ◽  
Vol 82 (3) ◽  
pp. 280-283 ◽  
Author(s):  
C. Bratfisch ◽  
M. K. Koch
Keyword(s):  
Water Hammer
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