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

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

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

Free vibration characteristics of flax fiber/ expanded polystyrene waste composite

2021 ◽  
Author(s):  
Abdu Mohammed ◽  
Temesegen Batu ◽  
Mengistu Manaye ◽  
Haiter Lenin Allasi
Keyword(s):  
Free Vibration ◽  
Expanded Polystyrene ◽  
Vibration Characteristics ◽  
Flax Fiber ◽  
Polystyrene Waste
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