scholarly journals CALCULATION METHOD OF UPLIFT FORCES AT PIER BASED ON GAS-LIQUID PHASE FLOW MODEL

2020 ◽  
pp. 33
Author(s):  
Daishi Okamoto ◽  
Hiroshi Ookubo ◽  
Hirotsugu Kasahara ◽  
Naoyuki Nakamura ◽  
Masashi Watanabe ◽  
...  
Keyword(s):  
Shock Wave ◽  
Numerical Calculation ◽  
Flow Model ◽  
Breaking Wave ◽  
Detailed Knowledge ◽  
Wave Pressure ◽  
Action Time ◽  
Shock Wave Pressure ◽  
The Relationship ◽  
Uplift Forces

Seaside facilities such as pier are affected by uplift forces due to storm surge and waves caused by typhoons. Therefore, detailed knowledge of external force is required for designing the pier (Tanimoto et al., 1978). Previously, the elucidation of the uplift forces and the shock wave pressure has been a major issue. Indeed, it has been clarified by experiments. Bagnold (1939) conducted an experimental study for revealing the relationship between the air layer and the pressure value, and found that air, which is a compressible fluid, reduces the pressure value. Furthermore, air has the effect for prolonging the action time. Arikawa and Yamano (2009) conducted the numerical simulation of shock breaking wave pressure by considering the inclusion of gas, and it was shown that the shock wave pressure after breaking wave can be reproduced. However, there are few cases that numerical calculation is considered for phenomena such as lifting pressure that are greatly affected by air. In this research, reproduction calculation of experiment was performed using numerical calculation for incompressible fluid. In addition, we will make a hole in the slab for calculation and investigate how the uplift forces changes.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/0o5GGt442jU

Study on the Characteristics of Shock Wave Pressure Caused by Underwater Blasting

2013 ◽  
Vol 405-408 ◽  
pp. 692-695
Author(s):  
Ming Sheng Hao ◽  
Hong Lei Liu
Keyword(s):  
Shock Wave ◽  
Safety Assessment ◽  
Environmental Safety ◽  
Bridge Piers ◽  
Pressure Amplitude ◽  
Characteristic Parameters ◽  
Wave Pressure ◽  
Positive Action ◽  
Action Time ◽  
Shock Wave Pressure

By analyzing the characteristics of shock waves in underwater blasting of two bridge piers and monitoring their pressures, this paper found the rule that shock wave pressure varies with different distances from the explosion source. The method of comparison was applied in this study. Based on the characteristic parameters such as pressure amplitude and positive action time, the attenuation formula of shock wave in shallow water was proposed. The results of this paper are of great importance to the engineering design and construction as well as environmental safety assessment.

scholarly journals A Lab-Scale Experiment Approach to the Measurement of Wall Pressure from Near-Field under Water Explosions by a Hopkinson Bar

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Xiongwei Cui ◽  
Xiongliang Yao ◽  
Yingyu Chen
Keyword(s):  
Shock Wave ◽  
Near Field ◽  
Underwater Explosion ◽  
Experimental System ◽  
Hopkinson Bar ◽  
Wall Pressure ◽  
Pressure Loading ◽  
Target Plate ◽  
Wave Pressure ◽  
Shock Wave Pressure

Direct measurement of the wall pressure loading subjected to the near-field underwater explosion is of great difficulty. In this article, an improved methodology and a lab-scale experimental system are proposed and manufactured to assess the wall pressure loading. In the methodology, a Hopkinson bar (HPB), used as the sensing element, is inserted through the hole drilled on the target plate and the bar’s end face lies flush with the loaded face of the target plate to detect and record the pressure loading. Furthermore, two improvements have been made on this methodology to measure the wall pressure loading from a near-field underwater explosion. The first one is some waterproof units added to make it suitable for the underwater environment. The second one is a hard rubber cylinder placed at the distal end, and a pair of ropes taped on the HPB is used to pull the HPB against the cylinder hard to ensure the HPB’s end face flushes with loaded face of the target plate during the bubble collapse. To validate the pressure measurement technique based on the HPB, an underwater explosion between two parallelly mounted circular target plates is used as the validating system. Based on the assumption that the shock wave pressure profiles at the two points on the two plates which are symmetrical to each other about the middle plane of symmetry are the same, it was found that the pressure obtained by the HPB was in excellent agreement with pressure transducer measurements, thus validating the proposed technique. To verify the capability of this improved methodology and experimental system, a series of minicharge underwater explosion experiments are conducted. From the recorded pressure-time profiles coupled with the underwater explosion evolution images captured by the HSV camera, the shock wave pressure loading and bubble-jet pressure loadings are captured in detail at 5  mm, 10  mm, …, 30  mm stand-off distances. Part of the pressure loading of the experiment at 35  mm stand-off distance is recorded, which is still of great help and significance for engineers. Especially, the peak pressure of the shock wave is captured.

Influence of a shock-wave pressure gradient on the appearance of a microhardness maximum in α-Fe irradiated by a high-power ion beam

1998 ◽  
Vol 24 (10) ◽  
pp. 819-821 ◽  
Author(s):  
A. N. Valyaev ◽  
A. D. Pogrebnyak ◽  
S. N. Bratushka ◽  
V. I. Lavrent’ev ◽  
S. N. Volkov ◽  
...  
Keyword(s):  
Shock Wave ◽  
Pressure Gradient ◽  
High Power ◽  
Ion Beam ◽  
Wave Pressure ◽  
Shock Wave Pressure

Effects of the aluminum content on the shock wave pressure and the acceleration ability of RDX-based aluminized explosives

2014 ◽  
Vol 116 (14) ◽  
pp. 144906 ◽  
Author(s):  
Z. Q. Zhou ◽  
J. X. Nie ◽  
Z. C. Ou ◽  
J. F. Qin ◽  
Q. J. Jiao
Keyword(s):  
Shock Wave ◽  
Aluminum Content ◽  
Wave Pressure ◽  
Acceleration Ability ◽  
Shock Wave Pressure

scholarly journals Superconductivity of Mg/MgO interface formed by shock-wave pressure

2013 ◽  
Vol 488 ◽  
pp. 18-24 ◽  
Author(s):  
N.S. Sidorov ◽  
A.V. Palnichenko ◽  
D.V. Shakhrai ◽  
V.V. Avdonin ◽  
O.M. Vyaselev ◽  
...  
Keyword(s):  
Shock Wave ◽  
Wave Pressure ◽  
Shock Wave Pressure

Measuring Projectile Velocity using Shock Wave Pressure Sensors

2014 ◽  
Vol 64 (6) ◽  
pp. 499-501 ◽  
Author(s):  
Sankarsan Padhy ◽  
◽  
Susmita Panigrahi
Keyword(s):  
Shock Wave ◽  
Pressure Sensors ◽  
Projectile Velocity ◽  
Wave Pressure ◽  
Shock Wave Pressure

Study on Dynamic Characteristics of Shock Wave Pressure Sensor Assembly Based on Differential Method

2016 ◽  
Vol 14 (5) ◽  
pp. 536-541 ◽  
Author(s):  
Yang Fan ◽  
Kong Deren ◽  
Kong Lin ◽  
Wang Fang ◽  
Zhang Jinqiu
Keyword(s):  
Shock Wave ◽  
Dynamic Characteristics ◽  
Pressure Sensor ◽  
Differential Method ◽  
Wave Pressure ◽  
Shock Wave Pressure ◽  
Sensor Assembly
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