Since programing complex and dynamic heat source model for welding simulation is a complex job,the parametric methods are studied in this paper.Firstly,an overall flow to achieve automatically modeling welding was int...Since programing complex and dynamic heat source model for welding simulation is a complex job,the parametric methods are studied in this paper.Firstly,an overall flow to achieve automatically modeling welding was introduced.Secondly,an expert module rule for selecting welding heat source model was founded,which is based on simulation knowledge and experiences.Thirdly,a modularity routine method was investigated using writing with C++programing,which automatically creates subroutines of 3D dynamic heat source model for user.To realize the dynamic weld path,the local weld path coordinate system was moved in the global coordinate system and it is used to model the direction of weld gun,welding path and welding pose.The weld path data file was prepared by the automatic tool for the welding heat source subroutines.All above functions were integrated in the user interface and the connection with architecture was introduced.At last,a laser beam welding heat source modeling was automatically modeled and the weld pool geometry was compared with the reported literature.It demonstrated that the automated tool is valid for welding simulation.Since modeling became convenient for welding simulation using the tool proposed,it could be easy and useful for welding engineers to acquire the needed information.展开更多
Thermal bridges may represent up to 50%of the building’s envelope area and may increase the energy consumption of buildings by up to 30%,however their impact is often not taken into account adequately in China.In thi...Thermal bridges may represent up to 50%of the building’s envelope area and may increase the energy consumption of buildings by up to 30%,however their impact is often not taken into account adequately in China.In this study,the energy performance of a typical two-story residential building under four different Chinese climate zones is investigated using WUFI Plus program in terms of annual heating and cooling energy demands.Several typical thermal bridges were taken into consideration.Two methods were used to evaluate the effect of thermal bridges on the building energy performance,the simplified method commonly used in China and the dynamic 3D modelling method,and were compared to do not consider thermal bridge.Also,two different types of building envelope,brick wall and aerated concrete wall,were used to evaluate the effect.The results show that by taking into account the thermal bridges,the annual heating energy demands of residential building increase 21.2%,24.8%,27.8%,and 16.6%under the four Chinese climate zones.Therefore,attention should be paid in the building envelope design to reduce thermal bridges.Compared to the dynamic 3D modelling method,the simplified method underestimates annual heating and cooling energy demands.展开更多
基金supported by Young Innovative Talents Training Plan of Heilongjiang(UNPYSCT-2018133).
文摘Since programing complex and dynamic heat source model for welding simulation is a complex job,the parametric methods are studied in this paper.Firstly,an overall flow to achieve automatically modeling welding was introduced.Secondly,an expert module rule for selecting welding heat source model was founded,which is based on simulation knowledge and experiences.Thirdly,a modularity routine method was investigated using writing with C++programing,which automatically creates subroutines of 3D dynamic heat source model for user.To realize the dynamic weld path,the local weld path coordinate system was moved in the global coordinate system and it is used to model the direction of weld gun,welding path and welding pose.The weld path data file was prepared by the automatic tool for the welding heat source subroutines.All above functions were integrated in the user interface and the connection with architecture was introduced.At last,a laser beam welding heat source modeling was automatically modeled and the weld pool geometry was compared with the reported literature.It demonstrated that the automated tool is valid for welding simulation.Since modeling became convenient for welding simulation using the tool proposed,it could be easy and useful for welding engineers to acquire the needed information.
基金supported by Natural Science Foundation of China(Grant no.51876087,51708271)Hunan Provincial Natural Science Foundation of China(Grant no.2021JJ50089)+1 种基金Scientific Research Project of Education Department of Hunan Province(Grant no.22A0301)China Scholarship Council(Grant No.2018020505002).
文摘Thermal bridges may represent up to 50%of the building’s envelope area and may increase the energy consumption of buildings by up to 30%,however their impact is often not taken into account adequately in China.In this study,the energy performance of a typical two-story residential building under four different Chinese climate zones is investigated using WUFI Plus program in terms of annual heating and cooling energy demands.Several typical thermal bridges were taken into consideration.Two methods were used to evaluate the effect of thermal bridges on the building energy performance,the simplified method commonly used in China and the dynamic 3D modelling method,and were compared to do not consider thermal bridge.Also,two different types of building envelope,brick wall and aerated concrete wall,were used to evaluate the effect.The results show that by taking into account the thermal bridges,the annual heating energy demands of residential building increase 21.2%,24.8%,27.8%,and 16.6%under the four Chinese climate zones.Therefore,attention should be paid in the building envelope design to reduce thermal bridges.Compared to the dynamic 3D modelling method,the simplified method underestimates annual heating and cooling energy demands.
