Prediction of the dynamic pressure distribution on a propeller blade under ice milling

2019 ◽  
Vol 188 ◽  
pp. 106284 ◽  
Author(s):  
L.Y. Ye ◽  
C.Y. Guo ◽  
C. Wang ◽  
C.H. Wang
Keyword(s):  
Pressure Distribution ◽  
Dynamic Pressure ◽  
Propeller Blade

Study of the Pressure Distribution between the Piston Rings in Reciprocating Compressors

2011 ◽  
Vol 383-390 ◽  
pp. 6048-6052
Author(s):  
Dian Bo Xin ◽  
Jian Mei Feng ◽  
Yan Jing Xu ◽  
Xue Yuan Peng
Keyword(s):  
Pressure Distribution ◽  
Piston Ring ◽  
Dynamic Pressure ◽  
Threshold Value ◽  
Piston Rings ◽  
Premature Failure ◽  
Root Cause ◽  
Pressure Distributions ◽  
Start Up ◽  
Set Up

Piston ring is one of the most important sealing components that can be easily damaged in reciprocating compressors. The severe non-uniformity of the pressure distribution was suggested to be the essential reason for the premature failure of the piston rings. Therefore, a test rig was set up to measure the pressure distributions as well as the build-up of the dynamic pressure difference, which could reveal the root cause for the non-uniformity of the pressure distributions. The results showed that the build-ups of the pressure differences between different rings were not simultaneous; there existed a threshold pressure, and the latter ring could work only when the pressure before the former ring reached to the threshold value. The pressure distributions were also investigated at the start-up and shut-down of the compressor, which further validated the cause of the premature failure of the first ring.

Review of the Influencing Factors of Pressure Exert on Compartment by Bulk Goods

2014 ◽  
Vol 587-589 ◽  
pp. 1216-1219
Author(s):  
Xiao Jing Feng ◽  
Tong Wei ◽  
Zhong Yi Zuo
Keyword(s):  
Fatigue Strength ◽  
Pressure Distribution ◽  
Influencing Factors ◽  
Dynamic Pressure ◽  
Prediction Method ◽  
Stochastic Vibration ◽  
Literature Reading

The pressure on the wagon body is generated for stochastic vibration of train or vehicle. The value and variation of this dynamic pressure are great significance in the study of the fatigue strength of the wagon body. This paper reviews the various influencing factors of the pressure distribution and also summarizes its simulation and prediction method based on the sufficiently literature reading.

Experimentally study of dynamic pressure distribution and oil film forces in journal bearing using ElectroMechanical Film sensor array

2019 ◽  
Vol 234 (4) ◽  
pp. 903-913
Author(s):  
Changmin Chen ◽  
Jianping Jing ◽  
Jiqing Cong ◽  
Chao Ji
Keyword(s):  
Pressure Distribution ◽  
Sensor Array ◽  
Journal Bearing ◽  
Dynamic Pressure ◽  
Vertical Direction ◽  
Journal Bearings ◽  
Film Sensor ◽  
Film Pressure ◽  
Oil Film ◽  
Oil Film Pressure

The acquisition of the oil film pressure and forces on the bearing pads through experimentation is crucial to understanding the characteristics of journal bearing. Lots of efforts had been taken in film pressure measurement, and the pressure was obtained at specified position on the bearing pads. However, due to the space and structure constraint, merely very limited number of the point pressure can be obtained with traditional sensors and acquiring the detail pressure field on whole bearing pad surface is still an open challenge. In this paper, a method based on thin-film sensors technique is proposed and employed to measure the pressure distribution and oil film forces of journal bearings. The measurement is conducted on a cylindrical journal bearing with two axial grooves, and ElectroMechanical Film sensor arrays are designed and laid on the surface of the bearing pads. The oil film pressure is acquired at up to 32 measurement points in total along the bearing pads in both circumference and axial directions. The pressure distribution in a wide rotation speed range is obtained successfully by using fitting algorithm. Furthermore, the oil film forces on horizon and vertical direction are obtained through the integration of the measured pressure filed. The test results prove that it is feasible to measure the oil pressure filed of journal bearings using ElectroMechanical Film piezo-film sensor array.

scholarly journals Toe function and dynamic pressure distribution in ostrich locomotion

2011 ◽  
Vol 214 (7) ◽  
pp. 1123-1130 ◽  
Author(s):  
N. U. Schaller ◽  
K. D'Aout ◽  
R. Villa ◽  
B. Herkner ◽  
P. Aerts
Keyword(s):  
Pressure Distribution ◽  
Dynamic Pressure

scholarly journals Finger and Palm Dynamic Pressure Monitoring for Basketball Shooting

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Chiao-Fang Hung ◽  
Chung-Chiang Chen ◽  
Shin-Hung Lin ◽  
Tien-Kan Chung
Keyword(s):  
Pressure Distribution ◽  
Index Finger ◽  
Dynamic Pressure ◽  
Test Method ◽  
Basketball Player ◽  
Basketball Players ◽  
College Basketball ◽  
Qualitative Test ◽  
The Moment ◽  
Robotic Applications

This study verified general inferences on the finger and palm pressure distribution of a basketball player in the moment before that player shoots a basketball through a scientific qualitative testing method. We mounted the sensor on the hands of college basketball players and monitored the dynamic pressure of each player’s hand while the player threw a basketball. The dynamic pressure distribution of the fingers and palm of a basketball player throwing a ball can be verified. According to the experimental results, college basketball players typically use the index finger to control the direction and power of force in the moment before shooting a basketball. This study successfully used a scientific qualitative test method to monitor the dynamic pressure of the fingers and palms of basketball players and verified the general inference that a typical basketball player mainly uses the index finger to control the direction and power of force in the moment before throwing a ball. In the future, this study, measuring the dynamic pressure distribution of the fingers and palm, can be applied to simulate hand manipulation in many biomedical and robotic applications.

Experimental investigation of pressure distribution between the piston rings and its formation in reciprocating compressors

2012 ◽  
Vol 226 (11) ◽  
pp. 2701-2712 ◽  
Author(s):  
Dianbo Xin ◽  
Jianmei Feng ◽  
Liqing Ding ◽  
Donghui Yang ◽  
Xueyuan Peng
Keyword(s):  
Pressure Distribution ◽  
Pressure Difference ◽  
Piston Ring ◽  
Dynamic Pressure ◽  
Experimental Results ◽  
Suction Pressure ◽  
Piston Rings ◽  
Ring Groove ◽  
Premature Failure ◽  
Contact Position

The severe non-uniformity of pressure distribution has been suggested as the essential reason for the premature failure of piston rings in reciprocating compressors. A test rig was built to investigate the dynamic pressure distribution and its formation process, so that the root cause of the non-uniform pressure distribution could be revealed. The experimental results showed that the pressure distribution between the rings was always significantly non-uniform under various test conditions and the first ring bore more than 75% of the total pressure difference. Further analysis of the experimental data indicated that when the suction pressure was not higher than that in the crank case, the first piston ring switched its contact position with the piston ring groove twice in one cycle, at the angles of around 63° and 170°, respectively, while the others switched contact positions at about 90° and 270°. If the suction pressure was higher than the pressure in the crank case, the first ring still switched its contact position twice in a cycle, at the crank angle of about 47° and 195°, respectively, but the other rings no longer changed their positions. The experimental results also demonstrated that the formation of pressure difference on different rings was not synchronous, which indicated that the rings could not work until their pressure difference reached a critical value.

Dynamic pressure distribution on a cylinder due to wave diffraction

1989 ◽  
Vol 16 (4) ◽  
pp. 343-353 ◽  
Author(s):  
S. Neelamani ◽  
V. Sundar ◽  
C.P. Vendhan
Keyword(s):  
Pressure Distribution ◽  
Wave Diffraction ◽  
Dynamic Pressure
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