The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform
Xiangyu Wang - One of the best experts on this subject based on the ideXlab platform.
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a stepwise risk assessment for Explosion events considering probability distribution of Explosion Load parameters
Complexity, 2018Co-Authors: Kiyeob Kang, Xiangyu WangAbstract:The potential risk of Explosion always exists in offshore topside facilities that deal with flammable materials. Thus, Explosion risk analysis taking into account possible scenarios should be performed during the design process to reduce probability of such terrible accidents. There are several technical documents for Explosion risk analysis. The analysis usually includes performance criteria, risk acceptance range, and corresponding Explosion design Load taking into account Explosion pressure. However, this standard procedure is not sufficient to assess the potential risk of Explosion, since it is usually based solely on the severity of overpressure. Therefore, more in-depth analysis is required to understand the potential risk taking Explosion wave profiles into account. In the present paper, a stepwise analysis of gas Explosion risk elements has been performed. Quantitative and qualitative analyses of Explosion risk have been performed based on the framework of typical Explosion risk analysis methods. In addition, both the probability distribution of Explosion Load parameters taking into account overpressure and its impulse and their correlation have been investigated extensively.
Xinming Qian - One of the best experts on this subject based on the ideXlab platform.
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simulation analysis on structure safety of coal mine mobile refuge chamber under Explosion Load
Safety Science, 2012Co-Authors: Huanjuan Zhao, Xinming QianAbstract:In order to check structural strength of coal mine mobiles refuge chamber, and do security evaluation of the mobile refuge chamber, a refuge chamber model was established, then a finite element method was instituted for it to ensure the refuge chamber would not be severely damaged when gas or coal dust Explosion suddenly happened. A triangle shock wave with 1.2 MPa over-pressure, 300 ms lasting time was settled. Explicit nonlinear dynamic analysis program was used to simulate response of the refuge chamber. The maximum stress was 244 MPa, located in central part of sides and tail end of the last capsule. The maximum displacement was 29.32 mm, located in central part of sides and tail end of the last capsule. The calculation indicated that the refuge chamber was not obviously damaged. It could reliable work to meet safety requirements. Compared with the reported experimental results, the simulation method was verified. Based on analysis, suggestions were put forward for further improving.
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simulation analysis on structure safety of refuge chamber door under Explosion Load
Procedia Engineering, 2012Co-Authors: Xingna Luo, Xinming Qian, Huanjuan Zhao, Ping HuangAbstract:Abstract In order to keep strong structure and nice sealing property of refuge chamber door during its life cycle, a basic structure of the door was designed and its finite element models were established, with 10, 20, 25 mm, three kinds of thickness, respectively for numerical simulation. Finite element software ANSYS/LS-DYNA was taken in the numerical simulation part. Deformation and the sealing performance of the door under a triangle Explosion shock wave with maximum value for 0.6 MPa and 300ms duration was calculated. The maximum stress value appears in the connection position between the door plank and reinforced stiffeners. The maximum displacement value appears in the middle of the door plank. Stiffeners have significant effect on the maximum displacement. The door with 20 mm thickness could fulfill the requirements of structure safety and nice sealing property. Based on analysis, suggestions were put forward for further improving.
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simulation analysis on structure safety of two typical refuge chamber shell forms under Explosion Load
Procedia Engineering, 2012Co-Authors: Huanjuan Zhao, Xinming QianAbstract:Abstract In order to reduce the risk of sealing and improve the structural strength safety for coal mine mobile refuge chamber, two models with certain proportion were set up after mechanical analysis. One was one-piece coal mine mobiles refuge chamber form which involves less sealing problems between sections, the other was segmented coal mine mobiles refuge chamber form which is easy to transport. A simulation analysis method was used to confirm their structure safety. Verified finite element analysis method was used to simulate the responses under blast Loading. Considering the harsh conditions, the maximum pressure of the triangle impact Load was 0.8 MPa, and the pulse width was 300ms. The maximum stress of one-piece one is less than segmented one. It demonstrated that section connecting position can cause more stress concentration. The maximum displacement one of one-piece is more than segmented one. It demonstrated that segmented type had lower displacement. Weak part of one-piece was middle position of front and back end shell. Weak parts of segmented type were middle position of sides and section connecting position. Based on their weak places analyzed, suggestions were put forward for the two kinds. Arc structure might be used in the front and back end shell. The front and back end shell might be thickened. Only inclined shaft with larger wellhead is suitable for this type. Segmented type could be used in large or medium-sized one.
Yan Bo - One of the best experts on this subject based on the ideXlab platform.
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Damage Model Test of Prestressed T-Beam Under Explosion Load
IEEE Access, 2019Co-Authors: Han Guozhen, Yan BoAbstract:Bridge is an important infrastructure in road traffic, which may bear the accidental Load of terrorist attacks and transportation accidents and Explosions in its life cycle. In this paper, three groups of prestressed T-beam model tests were carried out in response to the terrorist Explosion on the bridge deck. The results show that with the increase of explosive equivalent, the failure degree of prestressed steel reinforcement is aggravated, the number of anchorage falling off is increased, and the normal steel reinforcement evolved from failure to fracture. The fracture shape of the web of prestressed T-beam was “X”, and the failure form on both sides of the web was roughly “I” shape. The number of concrete cracks increased, and the crack depth and the size of the crack increased. The local failure mode of T-beam evolved from seismic collapse to penetrating failure, and the residual bearing capacity of prestressed T-beam gradually decreased.
Xiongliang Yao - One of the best experts on this subject based on the ideXlab platform.
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A combined experimental and numerical investigation on damage characteristics of ice sheet subjected to underwater Explosion Load
Applied Ocean Research, 2020Co-Authors: Ying Wang, Yezhi Qin, Xiongliang YaoAbstract:Abstract The objective of this study is to investigate the damage characteristics response of the ice sheet and reveal the mechanism of ice-breaking subjected to the underwater Explosion. The Arbitrary-Lagrangian–Eulerian (ALE) algorithm for the fluid–structure-interaction issue of the LS-DYNA software was adopted. The efficiency and accuracy of the underwater Explosion material and numerical model were studied. Besides, the reliability of the numerical model for ice-breaking subjected to the underwater Explosion was validated further by comparing it with the experiment test. Then, the damage characteristics and dynamic response of the ice sheet suffering from underwater Explosion Load are investigated. Besides, the shock pressure propagating characteristics and bubble dynamics were analyzed. The results show that the shock wave can cause the ice sheet initial damage to the ice sheet, and the bubble movement and water jet have significance on ice fractured and crushed. Then the effects of the main factors affecting the efficiency ice-breaking subjected to the underwater Explosion were investigated and discussed. A predicted formula for damage area is put forward, which can be available for guiding engineering ice-breaking underwater blast.
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semi analytical and experimental investigation of the whipping response of a cylinder subjected to underwater Explosion Load
Ships and Offshore Structures, 2019Co-Authors: Wenqi Zhang, Xiongliang Yao, Liangtao Liu, Zhikai WangAbstract:ABSTRACTThe purpose of this study was to investigate the whipping response of a cylinder subjected to underwater Explosion. A semi-analytical method contains shock wave and bubble pulsation Load wa...
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wall effect of underwater Explosion Load based on wave motion theories
China Ocean Engineering, 2014Co-Authors: Wei Xiao, Xiongliang Yao, Jun GuoAbstract:Owing to the existence of the flow field boundary, the shock wave Load near the boundary is different from the free field shock wave Load. In the present paper, the hull plate Load subjected to underwater shock wave is investigated based on wave motion theories; in addition, the experimental study of the hull plate Load is carried out. According to the theoretical analysis of the hull plate pressure, we find that the hull plate pressure oscillates repeatedly and decays rapidly with time passing, the maximum hull plate pressure is 2/(1+n) times the maximum free field pressure, where n is the ratio of impedance, and the impulse is much smaller than the free field impulse. Compared with the experimental study, the theoretical results agree well with the experimental data.
N H A Versloot - One of the best experts on this subject based on the ideXlab platform.
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a quantitative risk assessment tool for the external safety of industrial plants with a dust Explosion hazard
Journal of Loss Prevention in The Process Industries, 2007Co-Authors: M M Van Der Voort, A J J Klein, M De Maaijer, A C Van Den Berg, J R Van Deursen, N H A VerslootAbstract:A quantitative risk assessment (QRA) tool has been developed by TNO for the external safety of industrial plants with a dust Explosion hazard. As a first step an industrial plant is divided into groups of modules, defined by their size, shape, and constructional properties. Then the relevant Explosion scenarios are determined, together with their frequency of occurrence. These include scenarios in which one module participates, as well as domino scenarios. The frequency is partly based on casuistry. A typical burning velocity is determined depending on the ignition type, the dust properties and the local conditions for flame acceleration. The resulting pressure development is predicted with the 'thin flame model'. Module failure occurs when the Explosion Load exceeds thresholds, which are derived from single degree of freedom (SDOF) calculations for various types of modules. A model has been developed to predict the process of pressure venting after module failure and the related motion of launched module parts. The blast effects of the primary Explosion are based on results from calculations with BLAST3D. The blast and flame effects of the secondary external Explosion due to venting are calculated using existing models. The throw of fragments and debris is quantified with a recently developed model. This model is based on trajectory calculations and gives the impact densities, velocities, and angles as output. Furthermore the outflow of bulk material is taken into account. The consequences for external objects and human beings are calculated using existing models. Finally the risk contours and the Societal risk (FN curve) are calculated, which can be compared to regulations. © 2007 Elsevier Ltd. All rights reserved.
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a quantitative risk assessment tool for the external safety of industrial plants with a dust Explosion hazard
Journal of Loss Prevention in The Process Industries, 2007Co-Authors: M M Van Der Voort, A J J Klein, M De Maaijer, A C Van Den Berg, J R Van Deursen, N H A VerslootAbstract:A quantitative risk assessment (QRA) tool has been developed by TNO for the external safety of industrial plants with a dust Explosion hazard. As a first step an industrial plant is divided into groups of modules, defined by their size, shape, and constructional properties. Then the relevant Explosion scenarios are determined, together with their frequency of occurrence. These include scenarios in which one module participates, as well as domino scenarios. The frequency is partly based on casuistry. A typical burning velocity is determined depending on the ignition type, the dust properties and the local conditions for flame acceleration. The resulting pressure development is predicted with the 'thin flame model'. Module failure occurs when the Explosion Load exceeds thresholds, which are derived from single degree of freedom (SDOF) calculations for various types of modules. A model has been developed to predict the process of pressure venting after module failure and the related motion of launched module parts. The blast effects of the primary Explosion are based on results from calculations with BLAST3D. The blast and flame effects of the secondary external Explosion due to venting are calculated using existing models. The throw of fragments and debris is quantified with a recently developed model. This model is based on trajectory calculations and gives the impact densities, velocities, and angles as output. Furthermore the outflow of bulk material is taken into account. The consequences for external objects and human beings are calculated using existing models. Finally the risk contours and the Societal risk (FN curve) are calculated, which can be compared to regulations. © 2007 Elsevier Ltd. All rights reserved.
