Modeling for Pressure Wave into Water Pipeline

2013 ◽  
pp. 71-111
Keyword(s):  
Pressure Wave ◽  
Water Pipeline

Numerical and experimental investigation on internal membrane pressure wave inside sealed structure

2013 ◽  
Vol 61 (3) ◽  
pp. 613-621 ◽  
Author(s):  
W. Barnat
Keyword(s):  
Experimental Investigation ◽  
Pressure Wave ◽  
Pressure Increase ◽  
Internal Organs ◽  
Pressure Impulse ◽  
Internal Membrane ◽  
Contaminated Area

Abstract The article presents an approach to modeling the internal membrane pressure wave inside a sealed structure. During an explosion near a vehicle when a pressure wave reaches a hull, a pressure wave inside arises due to the hull’s bottom and the deformation of sides. They act like the piston - membrane. This membrane transfers the pressure impulse into the vehicle’s interior. A pressure increase causes the damage of internal organs or even death of occupants. In case of an armor penetration the pressure increase may be even larger. One of basic methods to protect a crew is to open hatches. However, such a method cannot be used in a contaminated area.

Drinking water pipeline: New PVC formulation anti-biofilm for the Moroccan industry

2017 ◽  
Vol 8 (12) ◽  
pp. 4444-4450
Author(s):  
H. El Omari ◽  
N. Boutaleb ◽  
B. Bahlaouan ◽  
S. Oualich ◽  
A. Jrifi ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Pipeline

Pressure management in Waitakere City, New Zealand - a case study

2003 ◽  
Vol 3 (1-2) ◽  
pp. 135-141 ◽  
Author(s):  
Z. Pilipovic ◽  
R. Taylor
Keyword(s):  
Water Use ◽  
Water Loss ◽  
Water Cycle ◽  
Demand Management ◽  
Cost Benefit ◽  
Water Shortage ◽  
Design Tool ◽  
Network Computer ◽  
Water Pipeline ◽  
The City

In 1996, as part of Waitakere Council’s Water Cycle Strategy, a pressure standardisation programme to permanently lower the average supply pressure citywide was implemented with the aim of reducing water loss and water use. The experience gained during the 1994/95 Auckland water shortage had confirmed that there was considerable scope to reduce pressures in many areas. Since 1996 water pressures have been reduced in over 60% of the reticulated area of the city, with the average pressure reduced from 710 kPa to 540 kPa. As a result of this programme water loss from the network has been reduced, there has been a reduction in the frequency of mains breaks and it is likely that the life of water pipeline assets has been extended. Furthermore both pressure and demand management initiatives have reduced per capita water use in the city by more than 10%. A network computer model was used as a design tool to check the network under various pressure regimes and cost benefit analyses were carried out for various design scenarios. Fire sprinkler systems were checked as part of the design process. Minimum service standards were not reduced and in some cases pressures were actually increased. This paper covers the various aspects of the design, the implementation and the results of the pressure standardisation programme.

Iterative learning control of air pressure variation inside a high-speed train under the excitation of the tunnel pressure wave with a fixed-morphologic form

2021 ◽  
pp. 095440972110327
Author(s):  
Zhiying He ◽  
Chunjun Chen ◽  
Dongwei Wang ◽  
Chao Deng ◽  
Jia Hu ◽  
...  
Keyword(s):  
Iterative Learning Control ◽  
Pressure Wave ◽  
High Speed ◽  
Learning Control ◽  
Pressure Variation ◽  
Iterative Learning ◽  
Air Pressure ◽  
High Speed Train ◽  
Comfort Index ◽  
Simulation Signal

Based on the characteristics that the tunnel pressure wave has a fixed-morphologic form when the same train passes through the same tunnel, an applicational approach based on the iterative learning control (ILC) is developed, aiming at overcoming the drawbacks of the traditional strategy for controlling the air pressure variation inside a high-speed train carriage. To achieve the goal, the control system is mathematically modelled. Then, the problem is formulated. The task of suppressing the influence of the tunnel pressure wave on the air pressure inside the carriages is shifted as an ILC problem of tracking the comfort index with varying trial length. The algorithm of refreshing the control signal from trial to trial is determined and the process of ILC control is designed. Next, the convergence of the newly-developed applicational ILC algorithm is discussed and the algorithm is simulated by the simulation signal and field-test signal. Results show that the applicational ILC algorithm be more adaptable in handling the control of the air pressure inside carriage under the excitation of varying-amplitude, varying-scale and varying-initial-states tunnel pressure wave. Meanwhile, the matching with tunnel pressure wave makes the applicational ILC algorithm will take both the riding comfort and fresh air into consideration, which upgrades the performances when the high-speed train passing through long tunnels.

Moderately increased alcohol consumption is associated with higher pressure wave reflections and blood pressure in men

2020 ◽  
Author(s):  
Eirini D. Basdeki ◽  
Christiana Tsirimiagkou ◽  
Antonios Argyris ◽  
George Moschonis ◽  
Petros Sfikakis ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Alcohol Consumption ◽  
Pressure Wave ◽  
Wave Reflections

scholarly journals Field Test of Online Leakage Noise Monitoring for Pressure Water Pipeline

2021 ◽  
Vol 1043 (4) ◽  
pp. 042014
Author(s):  
Tianxiang Lin ◽  
Guanlin Ye ◽  
Shaokong Feng ◽  
Xinmin Zhu
Keyword(s):  
Field Test ◽  
Pressure Water ◽  
Water Pipeline
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