Research on Hydrogen Absorption Mechanism Modeling of the NdFeB Hydrogen Decrepitation Process

2013 ◽  
Vol 823 ◽  
pp. 644-649
Author(s):  
Qi Li ◽  
Wen Bin Shang ◽  
Lin Zhu ◽  
Jian Min Zhao
Keyword(s):  
Hydrogen Absorption ◽  
Kinetic Equations ◽  
Dynamic Mechanism ◽  
Reaction Process ◽  
Absorption Mechanism ◽  
Mechanism Model ◽  
Space Modeling ◽  
Mechanism Modeling ◽  
Hydrogen Decrepitation ◽  
Absorption Dynamic

The behavior of hydrogen absorption in the NdFeB Hydrogen Decrepitation process is affected by the shape of the NdFeB alloy, pressure and temperature curves of the reaction process, which makes the reaction process with characteristics of nonlinear, time-varying parameters and coupling. In this study, we proposed a state space modeling method to describe the dynamic mechanism model of the hydrogen decrepitation process, and determine the main parameters of the model according to the mass balance, energy balance and kinetic equations. Then implemented the simulation model of the hydrogen absorption dynamic mechanism model using the matlab language. The simulation results were compared with the measured data, which verified the correctness of the model.

scholarly journals Micro/Nano-Structural Transition and Hydrogen Absorption Mechanism in Mg/Cu Super-Laminate Composites

2015 ◽  
Vol 79 (12) ◽  
pp. 644-650 ◽  
Author(s):  
Koji Tanaka ◽  
Hiroyuki T. Takeshita ◽  
Ho Shin ◽  
Kosuke Kurumatani ◽  
Tetsu Kiyobayashi ◽  
...  
Keyword(s):  
Hydrogen Absorption ◽  
Structural Transition ◽  
Absorption Mechanism ◽  
Laminate Composites

scholarly journals Analysis of cable effect on dynamic motion of an underwater vehicle for welding of reaction pool

2019 ◽  
Vol 11 (11) ◽  
pp. 168781401988676
Author(s):  
Zhandong Li ◽  
Jianguo Tao ◽  
Hao Sun ◽  
Yang Luo ◽  
Jingkui Li ◽  
...  
Keyword(s):  
Differential Equation ◽  
Mechanical Characteristics ◽  
Three Dimensional ◽  
Dynamic Mechanism ◽  
Dynamic State ◽  
Remotely Operated Vehicle ◽  
Emergency Rescue ◽  
Mechanism Modeling ◽  
Reactor Pool ◽  
And Control

Remotely operated vehicle is a reliable tool in an emergency rescue and routing inspection of a reactor pool. In practice, a cable has been considered as an important part of a vehicle system (i.e. winch, vehicle, and cable) to evaluate and predict the mechanical characteristics, and this article presents a study on a dynamic mechanism modeling of a cable partially in water and air based on an omnidirectional motion, and a numerical simulation is employed. In this work, we programmed the model governed by a partial differential equation set, at the discrete time node which was transformed into an ordinary differential equation set regarded as an initial value problem. The dynamic mechanical characteristics of the lower endpoint (i.e. a connection point between vehicle and cable) and the upper endpoint (i.e. a connection point between cable and winch) were, respectively, quantified with acceleration and a compounded motion including a uniform and rolling motion. A dynamic-state mechanism test was carried out to verify an authenticity of the three-dimensional mechanical model and numerical solution in a circulating tank. The results demonstrated that the presented method was used to evaluate the dynamic mechanism, and held a potential to improve a vehicle design and control strategy.

KINETICS OF HYDROGEN ABSORPTION IN Ti600 ALLOY

2009 ◽  
Vol 23 (06n07) ◽  
pp. 863-868 ◽  
Author(s):  
XIAOLI WANG ◽  
YONGQING ZHAO ◽  
WEIDONG ZENG ◽  
HONGLIANG HOU ◽  
YAOQI WANG
Keyword(s):  
Chemical Reaction ◽  
Hydrogen Absorption ◽  
Exothermic Reaction ◽  
Three Dimensional ◽  
Time Dependent ◽  
Reaction Process ◽  
Rate Equations ◽  
Absorption Process ◽  
Reaction Rate Constants ◽  
Hydriding Reaction

The kinetics and mechanism of hydrogen absorption in Ti 600 alloy were investigated at various temperatures (873 K ≤ T ≤ 1123 K ). The rate of hydrogen absorption and equilibrium hydrogen pressure increased with the increase of temperature. Because hydriding reaction is an exothermic reaction, solubility of hydrogen decreased with increasing temperature. The experiment results were interpreted from the time dependent hydrogen absorption curves using various rate equations to reveal the mechanism of the hydrogen absorption processes. The hydriding reaction rate constants were extracted from the time-dependent hydrogen absorption curves. The mechanism of hydriding reaction in different stages has been analyzed. It was found that the chemical reaction process dominated the hydrogen absorption process at 923K. The chemical reaction process and the three-dimensional diffusion process dominated the hydrogen absorption process at 973K or higher.

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