Results 71 to 80 of about 373,270 (195)

Detecting Pressure Waves during Earthquakes in an In-Service Pipeline System for Agricultural Irrigation using Numerical Analysis

e-Journal of Nondestructive Testing
Seismic hydrodynamic pressure, which is burst water pressure fluctuation induced by earthquakes, is often observed in water pipelines. The earthquake damage includes detachment and damage to pneumatic valves in curved pipe sections, and we believe that ...
Taiki Hagiwara, Takashi Ohkubo, Kaori Hoshino   +2 more
doaj   +1 more source

Influences on Bottom Hole Pressure in Riserless Drilling under Platform Disturbance

Shiyou jixie, 2022
In order to solve the problem of bottom hole pressure fluctuation caused by drilling platform disturbance in riserless drilling,a mathematical model for platform-drill string coupling vibration and a model for bottom hole pressure fluctuation were ...
Zuo Kai, Niu Guifeng, Wang Chuan, Liu Jing   +3 more
doaj  

Numerical analysis of pressure fluctuation in a multiphase rotodynamic pump with air–water two-phase flow

Oil & Gas Science and Technology, 2019
Pressure fluctuation in single-phase pumps has been studied widely, while less attention has been paid to research on multiphase pumps that are commonly used in the petroleum chemical industry.
Zhang Wenwu, Yu Zhiyi, Li Yongjiang, Yang Jianxin, Ye Qing   +4 more
doaj   +1 more source

Semi-diurnal pressure fluctuation in the ERA40 Data

Meteorologische Zeitschrift, 2007
In a regional analysis the removal of the globally present semi-diurnal pressure signal could be necessary in order to isolate the pressure signal of regional features.
Klaus P. Hoinka
doaj   +1 more source

Semi-dynamical approach to the shock revival in core-collapse supernovae

, 2013
We develop a new semi-dynamical method to study shock revival by neutrino heating in core- collapse supernovae. Our new approach is an extension of the previous studies that employ spherically symmetric, steady, shocked accretion flows together with the ...
Blondin, Bruenn, Burrows, Burrows, Dolence, Fernández, Foglizzo, Hanke, Hiroki Nagakura, Iwakami, Marek, Mueller, Murphy, Murphy, Murphy, Nagakura, Nagakura, Nagakura, Nagakura, Nakayama, Nakayama, Nobuta, Nordhaus, Ohnishi, Ott, Pejcha, Shen, Shoichi Yamada, Suwa, Takiwaki, Yamamoto, Yamasaki, Yamasaki, Yu Yamamoto   +33 more
core   +1 more source

An experimental study of the properties of surface pressure fluctuations for separating turbulent boundary layers [PDF]

Noise generated by helicopter and turbomachine rotors is a nuisance that designers would like to predict and to minimize within other design constraints.
Simpson, Roger L.
core   +1 more source

Design of Adaptive Negative Pressure Regulating System for Glass Solidification of HLLW by Cold Crucible

Yuanzineng kexue jishu, 2022
During the operation of twostep cold crucible glass solidification device, the pressure control of cold crucible and calciner is very important. However, due to the periodic decomposition or sealing problem of calcined products, there will be large ...
WANG Zexue;LI Baojun;LI Yusong;QIE Dongsheng
doaj  

LSTM Reconstruction of Turbulent Pressure Fluctuation Signals

Computation
This paper concerns the application of a long short-term memory model (LSTM) for high-resolution reconstruction of turbulent pressure fluctuation signals from sparse (reduced) data.
Konstantinos Poulinakis, Dimitris Drikakis, Ioannis W. Kokkinakis, S. Michael Spottswood, Talib Dbouk   +4 more
doaj   +1 more source

Experimental study on the flow structure and sound generation between the blades of multi-blade fan

Nihon Kikai Gakkai ronbunshu, 2017
The relationship between flow structure and generation of aerodynamic sound from a multi-blade fan is experimentally investigated with enlarged two-dimensional blade models. Two blade models with different shapes are used.
Koji IWANO, Yusuke GOTO, Yuya FUKAO, Yasuhiko SAKAI, Yasumasa ITO, Koji NAGATA, Masaharu SAKAI, Toshinori OCHIAI, Shuzo ODA   +8 more
doaj   +1 more source

Study on Pressure Fluctuation Characteristics of Hydraulic Pulsed Jet

Shiyou jixie, 2016
By producing instantaneous negative pressure and pulse shock at the bottomhole,the pulsed jet could reduce the pressure holding effect on the cuttings and improve the efficiency of rock breaking and cutting removing.On the basis of the established ...
Zhang Yi, Li Gensheng, Shi Huaizhong, Wei Minghui   +3 more
doaj