Dynamic damage study of sintered NdFeB in electromagnetic buffer under intensive impact load: Experiments, numerical simulation, and interval uncertain optimization

2021 ◽  
pp. 1-17
Author(s):  
Lei Li ◽  
Guolai Yang ◽  
Quanzhao Sun
Keyword(s):  
Numerical Simulation ◽  
Impact Load ◽  
Uncertain Optimization ◽  
Dynamic Damage ◽  
Damage Study

Numerical Simulation of Blasting-Induced Damage in Grouting Curtain of Sandstone Aquifer for Vertical Shaft

2015 ◽  
Vol 723 ◽  
pp. 271-278
Author(s):  
Yu Liang Zhou ◽  
Dong Feng Yuan ◽  
Jun Zheng ◽  
Hua Wang
Keyword(s):  
Numerical Simulation ◽  
Prevention And Control ◽  
Damage Zone ◽  
Surrounding Rock ◽  
Damage Effect ◽  
Vertical Shaft ◽  
Control Methods ◽  
Sandstone Aquifer ◽  
And Control ◽  
Dynamic Damage

To provide a theoretical basis for water prevention and control methods and reasonable supporting techniques for vertical shaft, and to ensure the shaft construction to pass the sandstone aquifer safely and rapidly, numerical simulation using dynamic damage constitutive model, which was a user-defined constitutive modules in FLAC3D, a lagrangian analysis code in three dimensions, has been applied to investigate the dynamic damage effect in the surrounding rock of the grouting curtain near the driving working face for vertical shaft excavated by blasting. The results indicate that the distribution of the damage zone in the surrounding rock of the shaft, which decreases the effective thickness of the grouting curtain, was like a ellip-se, and that the depth of the damage zone in the surrounding rock of the shaft grouting curtain is fewer than that of the driving face floor. It can be concluded that the centre part of the driving face floor, especially the cutting hole zones, and the shaft wall in the greater horizontal stress side are the " key parts " for shaft water prevention and control methods.

Numerical Simulation and Experimental Study on Fluid-Filled Hemispherical Shell under Impact

2013 ◽  
Vol 364 ◽  
pp. 172-176
Author(s):  
Hui Wei Yang ◽  
Bin Qin ◽  
Zhi Jun Han ◽  
Guo Yun Lu
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Impact Load ◽  
Elastic Recovery ◽  
Plastic Hinge ◽  
Time History ◽  
Hemispherical Shell ◽  
History Of ◽  
Local Impact ◽  
The Impact

The dynamic response of fluid-filled hemispherical shell in mass impact is studied by experiment using DHR9401. Combining the time history of impact force with experimental observation of the deformation process, it can be seen that the dynamic response can be divided into four stages: the flattening around the impact point, the forming and expanding outward of shell plastic hinge, the plastic edge region flatten by the punch, and elastic recovery. The experimental results show that: Because the shell filled with liquid, the local impact load that the shell suffered is translated into area load and loads on the inner shell uniformly, so that it has a high carrying capacity. Numerical simulation is used to study the time history of energy absorption of different shell structures. The result shows that the crashworthiness of sandwich fluid-filled shell is improved greatly. Under the certain impact energy, deformation of its inner shell is very small, which can provide effective security space.

Numerical Simulation of Two-Phase Sloshing Flow in LNG Tank Using Finite-Analytic Level-Set Method

2007 ◽  
Author(s):  
Kai Yu ◽  
Hamn-Ching Chen ◽  
Jang Whan Kim ◽  
Young-Bum Lee
Keyword(s):  
Numerical Simulation ◽  
Wave Breaking ◽  
Impact Load ◽  
Three Dimensional ◽  
Impact Pressure ◽  
Staggered Grid ◽  
Two Phase ◽  
Local Flow ◽  
Hull Structure ◽  
Lng Tank

Impact pressure due to sloshing is of great concern for the ship owners, designers and builders of the LNG carriers regarding the safety of LNG containment system and hull structure. Sloshing of LNG in a partially filled tank has been an active area of research with numerous experimental and numerical investigations over the past decade. In order to accurately predict the sloshing impact load, it is necessary to develop advanced numerical simulation tools which can provide accurate resolution of local flow phenomena including wave breaking, jet formation, gas entrapping and liquid-gas interactions. In the present study, a new numerical method is developed for the simulation of violent sloshing flow inside a three-dimensional LNG tank considering wave breaking and liquid-gas interaction. The sloshing flow inside a membrane-type LNG tank is simulated numerically using the Finite-Analytic Navier-Stokes (FANS) method. The governing equations for two-phase air and water flows are formulated in curvilinear coordinate system and discretized using the finite-analytic method on a non-staggered grid. Simulations were performed for LNG tank in transverse and longitudinal motions including horizontal, vertical, and rotational motions. The predicted impact pressures were compared with the corresponding experimental data. The validation results clearly illustrate the capability of the present two-phase FANS method for accurate prediction of impact pressure in sloshing LNG tank including violent free surface motion, three-dimensional instability and air trapping effects.

419 Dynamic Behavior and Numerical Simulation of Curtain-Cables Subjected to Impact Load

2004 ◽  
Vol 2004 (0) ◽  
pp. _419-1_-_419-3_
Author(s):  
Masato OGAWA ◽  
Masahiro WATANABE ◽  
Nobuyuki KOBAYASHI
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Impact Load

PID Control for Magnetorheological Elastomer Absorber with Impact Load

2011 ◽  
Vol 121-126 ◽  
pp. 1734-1738 ◽  
Author(s):  
Jie Fu ◽  
Miao Yu ◽  
Zhi Wei Xing
Keyword(s):  
Numerical Simulation ◽  
Mechanical Property ◽  
Mathematical Model ◽  
Control Strategy ◽  
Pid Control ◽  
Pid Controller ◽  
Impact Load ◽  
Variable Stiffness ◽  
Impact Testing ◽  
Magnetorheological Elastomer

In this paper, a semi-active impact control system, which consists of a new Magnetorehological elastomer (MRE) absorber with variable stiffness, is proposed and its vibration control with impact load is investigated. An impact testing platform is established and mechanical property of fabricated MRE is tested. Based on Newton’s law the appropriate mathematical model of MRE absorber system is established. PID controller for MRE absorber system is designed to reduce the effect of impact load. Finally, the effectiveness of control strategy is verified by numerical simulation.

Numerical Simulation on the Greenwater Impact Load of Offshore Structure in Regular Waves

2017 ◽  
Vol 54 (6) ◽  
pp. 492-500
Author(s):  
Ui-Ha Kang ◽  
Young-Gill Lee ◽  
In-Jun Yang ◽  
Ki-Yong Kim ◽  
Young-Seok Joo ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Impact Load ◽  
Regular Waves ◽  
Offshore Structure
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