Search

Your search keyword '"Ma, Huihuan"' showing total 142 results
Start Over Author "Ma, Huihuan"
142 results on '"Ma, Huihuan"'

40. Mechanism analysis of airbag explosion suppression and energy absorption in a flexible explosion suppression system

Author

Wang, Yajun, Ma, Huihuan, Han, Li, Xu, Xiuyan, Skrzypkowski, Krzysztof, Bascompta Massanes, Marc, Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC, and Universitat Politècnica de Catalunya. RIIS - Grup de Recerca en Recursos i Indústries Intel·ligents i Sostenibles

Subjects
Mine explosions --Prevention, Suppression, Explosion, Explosions en les mines-- Prevenció, Enginyeria civil::Enginyeria de mines::Explotació de mines [Àrees temàtiques de la UPC], Airbag, Coal mining, Methane, Mining, Flexible constraint
Abstract

The unfixed flame propagation velocity of a gas explosion and the fixed response time of explosion suppression devices are the important reasons for the poor protective effect of active explosion suppression. A flexible explosion suppression method based on buffer energy absorption is detailed in this study. The explosion suppression system consists of an explosive characteristic monitoring system, an explosion suppression agent system, and an explosion suppression airbag. An empty pipe experiment and an explosion suppression experiment with a flexible-airbag gas-explosion suppression device were conducted in a 20.5 m-long pipe with an inner diameter of 180 mm. The flame propagation velocity and maximum overpressure values were compared between the two groups of experiments. The experimental results show that the flame wave propagation can be completely suppressed by the explosion suppression device under certain pressure. The occurrence time of maximum overpressure at each pressure measuring point is also analyzed. P3 is generally later than P4, which verifies the existence of energy absorption and explosion suppression effect of airbag. Finally, the energy absorption effect of the airbag is analyzed theoretically. The shock wave overpressure calculated in the sealing limit state of the airbag is 0.3432 MPa, and the maximum error is 7.8%, which provides reliable guidance and prediction for the experimental process in the future. This research was funded the National Natural Science Foundation of China (No. 52174176) and the Natural Science Foundation of Heilongjiang Province (No. QC2015054). Peer Reviewed Objectius de Desenvolupament Sostenible::8 - Treball Decent i Creixement Econòmic

Published
2023

41. Mechanism analysis of airbag explosion suppression and energy absorption in a flexible explosion suppression system

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya. RIIS - Grup de Recerca en Recursos i Indústries Intel·ligents i Sostenibles, Wang, Yajun, Ma, Huihuan, Han, Li, Xu, Xiuyan, Skrzypkowski, Krzysztof, Bascompta Massanes, Marc, Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya. RIIS - Grup de Recerca en Recursos i Indústries Intel·ligents i Sostenibles, Wang, Yajun, Ma, Huihuan, Han, Li, Xu, Xiuyan, Skrzypkowski, Krzysztof, and Bascompta Massanes, Marc

Abstract

The unfixed flame propagation velocity of a gas explosion and the fixed response time of explosion suppression devices are the important reasons for the poor protective effect of active explosion suppression. A flexible explosion suppression method based on buffer energy absorption is detailed in this study. The explosion suppression system consists of an explosive characteristic monitoring system, an explosion suppression agent system, and an explosion suppression airbag. An empty pipe experiment and an explosion suppression experiment with a flexible-airbag gas-explosion suppression device were conducted in a 20.5 m-long pipe with an inner diameter of 180 mm. The flame propagation velocity and maximum overpressure values were compared between the two groups of experiments. The experimental results show that the flame wave propagation can be completely suppressed by the explosion suppression device under certain pressure. The occurrence time of maximum overpressure at each pressure measuring point is also analyzed. P3 is generally later than P4, which verifies the existence of energy absorption and explosion suppression effect of airbag. Finally, the energy absorption effect of the airbag is analyzed theoretically. The shock wave overpressure calculated in the sealing limit state of the airbag is 0.3432 MPa, and the maximum error is 7.8%, which provides reliable guidance and prediction for the experimental process in the future., This research was funded the National Natural Science Foundation of China (No. 52174176) and the Natural Science Foundation of Heilongjiang Province (No. QC2015054)., Peer Reviewed, Objectius de Desenvolupament Sostenible::8 - Treball Decent i Creixement Econòmic, Postprint (published version)

Published
2023

43. Testing and Numerical Simulation of the Shear Resistance of Blind-Bolted Aluminum Connections.

Author

Jiang, Yuqi, Ma, Huihuan, Zhang, Zhiming, and Cheng, Peng

Subjects
COMPUTER simulation, LARGE space structures (Astronautics), TORSIONAL stiffness, ALUMINUM, ALUMINUM plates, BOLTED joints, ALUMINUM foam
Abstract

Due to their high bending stiffness, high torsional stiffness, and high local stability, rectangular section members of Al alloy space structures are frequently utilized as load-bearing elements. However, the joint construction is more complex because of the closed cross-section. To join rectangular section members without drilling holes in them, a variety of blind bolts that can be placed and fastened on one side have been devised. The blind bolts researched in this paper is known as BOM bolt. The shear resistance of BOM-bolted Al alloy connections is investigated using shear testing and finite element calculations of individual bolts and bolt groups. According to the test and numerical simulation results, the formulas for the compressive strength of the aluminum plate and the shear capacity reduction factor of BOM-bolted long connections are derived. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

49. Numerical model for sediment transportation under breaking wave: The application exploration of VOF-CFD-DEM model in gas-fluid-particle system.

Author

Li, Boen and Ma, Huihuan

Subjects
*COMPUTATIONAL fluid dynamics, *WATER waves, *DISCRETE element method, *WAVES (Fluid mechanics), *POROUS materials
Abstract

The Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) model integrated with the Volume of Fluid (VOF) method is applied to study the complex gas-fluid-particle coupled system. To enhance the model's feasibility, the efficiency and accuracy improvement approaches are implemented into the model, including the coarse-grained method, porous medium replacement and semi-resolved method. To validate the effectiveness and accuracy of the model, simulations of the particle water entry and dam break scenarios are conducted, Subsequently, the VOF-CFD-DEM model is utilized to study the sediment transportation under breaking waves. A comparison of various turbulence models reveals that the stabilized k - ω model can simulate the breaking wave with acceptable efficiency and accuracy. The study examines the flow characteristics, forces acting on slopes, and typical sediment movements, providing detailed case studies and data relevant to gas-fluid-particle systems. This work extends the application of the VOF-CFD-DEM model to extreme conditions in ocean engineering, offering a mesoscopic perspective on complex engineering challenges. [ABSTRACT FROM AUTHOR]

Published
2025
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results