摘要 :
One style of aluminium alloy bumper was developed for a passenger car. Firstly, strength performance objective was obtained through three-point static pressure simulation analysis and test on steel bumper of a target vehicle. In o...
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One style of aluminium alloy bumper was developed for a passenger car. Firstly, strength performance objective was obtained through three-point static pressure simulation analysis and test on steel bumper of a target vehicle. In order to provide reference for aluminium alloy bumper on the design of structure and performance, benchmark analysis was applied on a reference aluminium alloy bumper. Then, the cross-section shape and dimension parameters of aluminium alloy bumper of target vehicle were obtained with OptiStruct topology optimization and size optimization, so that the material, process method and processing parameters of components of the production can be determined, among which, 6,061 aluminium alloy was employed for producing bumper beam with hot extrusion process, and 6,101 aluminium alloy was employed for producing crash box and flange with hot extrusion process. At last, low-speed collision simulation and test were used to analyze the energy absorption capacity of steel and aluminium alloy bumper. It has been found that: in the process of head-on collision, the energy absorption of aluminium alloy bumper is higher than that of steel bumper with increasing 5 %; the absorption per unit mass of aluminium bumper is significantly greater than that of steel bumper, and its deformation is 110 mm less than the permission displacement. Consequently, it is concluded that the crash-worthiness of aluminium alloy is better than that of steel bumper. In this paper, an aluminium alloy bumper was designed by using topology optimization and size optimization method, which has better performance, compacter structure and lighter weight than that of steel bumper. However, in view of the complexity of the actual working conditions applied by bumper, higher requirements should be taken into account in design process. Therefore, in subsequent structural optimization research, integration of additional conditions needs to be considered, such as collision, etc.
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摘要 :
One style of aluminium alloy bumper was developed for a passenger car. Firstly, strength performance objective was obtained through three-point static pressure simulation analysis and test on steel bumper of a target vehicle. In o...
展开
One style of aluminium alloy bumper was developed for a passenger car. Firstly, strength performance objective was obtained through three-point static pressure simulation analysis and test on steel bumper of a target vehicle. In order to provide reference for aluminium alloy bumper on the design of structure and performance, benchmark analysis was applied on a reference aluminium alloy bumper. Then, the cross-section shape and dimension parameters of aluminium alloy bumper of target vehicle were obtained with OptiStruct topology optimization and size optimization, so that the material, process method and processing parameters of components of the production can be determined, among which, 6,061 aluminium alloy was employed for producing bumper beam with hot extrusion process, and 6,101 aluminium alloy was employed for producing crash box and flange with hot extrusion process. At last, low-speed collision simulation and test were used to analyze the energy absorption capacity of steel and aluminium alloy bumper. It has been found that: in the process of head-on collision, the energy absorption of aluminium alloy bumper is higher than that of steel bumper with increasing 5%; the absorption per unit mass of aluminium bumper is significantly greater than that of steel bumper, and its deformation is 110 mm less than the permission displacement. Consequently, it is concluded that the crash-worthiness of aluminium alloy is better than that of steel bumper. In this paper, an aluminium alloy bumper was designed by using topology optimization and size optimization method, which has better performance, compacter structure and lighter weight than that of steel bumper. However, in view of the complexity of the actual working conditions applied by bumper, higher requirements should be taken into account in design process. Therefore, in subsequent structural optimization research, integration of additional conditions needs to be considered, such as collision, etc.
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摘要 :
One style of aluminium alloy bumper was developed for a passenger car. Firstly, strength performance objective was obtained through three-point static pressure simulation analysis and test on steel bumper of a target vehicle. In o...
展开
One style of aluminium alloy bumper was developed for a passenger car. Firstly, strength performance objective was obtained through three-point static pressure simulation analysis and test on steel bumper of a target vehicle. In order to provide reference for aluminium alloy bumper on the design of structure and performance, benchmark analysis was applied on a reference aluminium alloy bumper. Then, the cross-section shape and dimension parameters of aluminium alloy bumper of target vehicle were obtained with OptiStruct topology optimization and size optimization, so that the material, process method and processing parameters of components of the production can be determined, among which, 6,061 aluminium alloy was employed for producing bumper beam with hot extrusion process, and 6,101 aluminium alloy was employed for producing crash box and flange with hot extrusion process. At last, low-speed collision simulation and test were used to analyze the energy absorption capacity of steel and aluminium alloy bumper. It has been found that: in the process of head-on collision, the energy absorption of aluminium alloy bumper is higher than that of steel bumper with increasing 5 %; the absorption per unit mass of aluminium bumper is significantly greater than that of steel bumper, and its deformation is 110 mm less than the permission displacement. Consequently, it is concluded that the crash-worthiness of aluminium alloy is better than that of steel bumper. In this paper, an aluminium alloy bumper was designed by using topology optimization and size optimization method, which has better performance, compacter structure and lighter weight than that of steel bumper. However, in view of the complexity of the actual working conditions applied by bumper, higher requirements should be taken into account in design process. Therefore, in subsequent structural optimization research, integration of additional conditions needs to be considered, such as collision, etc.
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摘要 :
With the advent of Intelligent Traffic Systems (ITS) and Autonomous Driving (AD) technology, the Cooperative Vehicle Infrastructure System (CVIS) requires all vehicles to understand the local and nearby the traffic situation, that...
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With the advent of Intelligent Traffic Systems (ITS) and Autonomous Driving (AD) technology, the Cooperative Vehicle Infrastructure System (CVIS) requires all vehicles to understand the local and nearby the traffic situation, that is, to maintain real-time, continuous, and efficient communication between the Vehicle-to-Vehicle (V2V) and the Vehicle-to-Infrastructure (V2I). This paper first gives a comprehensive introduction to the CVIS from the research status, system architecture, research methods and specific application aspects. Then we introduce the basic concepts and communication standards of V2V and V2I wireless communication for CVIS, and take the traffic congestion problem as an example to illustrate the specific application based on V2V and V2I communication technology. At the end of the paper, the development trend of the CVIS based on V2V and V2I communication and the prospect of future research work are given.
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摘要 :
With the advent of Intelligent Traffic Systems (ITS) and Autonomous Driving (AD) technology, the Cooperative Vehicle Infrastructure System (CVIS) requires all vehicles to understand the local and nearby the traffic situation, that...
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With the advent of Intelligent Traffic Systems (ITS) and Autonomous Driving (AD) technology, the Cooperative Vehicle Infrastructure System (CVIS) requires all vehicles to understand the local and nearby the traffic situation, that is, to maintain real-time, continuous, and efficient communication between the Vehicle-to-Vehicle (V2V) and the Vehicle-to-Infrastructure (V2I). This paper first gives a comprehensive introduction to the CVIS from the research status, system architecture, research methods and specific application aspects. Then we introduce the basic concepts and communication standards of V2V and V2I wireless communication for CVIS, and take the traffic congestion problem as an example to illustrate the specific application based on V2V and V2I communication technology. At the end of the paper, the development trend of the CVIS based on V2V and V2I communication and the prospect of future research work are given.
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摘要 :
This paper summarizes the major activities of CFD study on buffeting of vehicles in recent years. The focus of this paper is the attempt to research the physic mechanism of vehicle buffeting further;to analyze the effects of th...
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This paper summarizes the major activities of CFD study on buffeting of vehicles in recent years. The focus of this paper is the attempt to research the physic mechanism of vehicle buffeting further;to analyze the effects of the side window openness on vehicle buffeting;and to find suitable sohttions for buffeting suppression, by using a developed procedure of CFD simulation with commercial software plus FFT acoustic post-processing. Two solutions are used for rear window buffeting reduction: constructing a cavity at the Bpillar; adding a dividing post on the rear window. Some perfectly results are obtained in this paper but feasibility still need discussion, so more efforts of wind tunnel testing are imperative for validating its feasibility.
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摘要 :
This paper summarizes the major activities of CFD study on buffeting of vehicles in recent years. The focus of this paper is the attempt to research the physic mechanism of vehicle buffeting further; to analyze the effects of the ...
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This paper summarizes the major activities of CFD study on buffeting of vehicles in recent years. The focus of this paper is the attempt to research the physic mechanism of vehicle buffeting further; to analyze the effects of the side window openness on vehicle buffeting; and to find suitable solutions for buffeting suppression, by using a developed procedure of CFD simulation with commercial software plus FFT acoustic post-processing. Two solutions are used for rear window buffeting reduction: constructing a cavity at the B-pillar; adding a dividing post on the rear window. Some perfectly results are obtained in this paper but feasibility still need discussion, so more efforts of wind tunnel testing are imperative for validating its feasibility.
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摘要 :
This paper summarizes the major activities of CFD study on buffeting of vehicles in recent years. The focus of this paper is the attempt to research the physic mechanism of vehicle buffeting further; to analyze the effects of the ...
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This paper summarizes the major activities of CFD study on buffeting of vehicles in recent years. The focus of this paper is the attempt to research the physic mechanism of vehicle buffeting further; to analyze the effects of the side window openness on vehicle buffeting; and to find suitable solutions for buffeting suppression, by using a developed procedure of CFD simulation with commercial software plus FFT acoustic post-processing. Two solutions are used for rear window buffeting reduction: constructing a cavity at the B-pillar; adding a dividing post on the rear window. Some perfectly results are obtained in this paper but feasibility still need discussion, so more efforts of wind tunnel testing are imperative for validating its feasibility.
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摘要 :
With the growing complexity of modern embedded software it is less feasible for testers to execute the complete path coverage testing in the engineering. With regard to this situation, this paper introduces a feasible method appli...
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With the growing complexity of modern embedded software it is less feasible for testers to execute the complete path coverage testing in the engineering. With regard to this situation, this paper introduces a feasible method applied to the critical path coverage testing. In this method, the critical path selection of the program tested is implemented with the algorithm for generating All Path Matrix (APM) in Activity on Edge (AOE) network. Then testers fulfills the test with the help of the analysis of Linear Coded Sequence and Jump (LCSAJ). Experiment results show that this method can reduce greatly the costs of software testing and improve significantly the testing efficiency under the precondition of assuring the software reliability.
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摘要 :
With the growing complexity of modern embedded software it is less feasible for testers to execute the complete path coverage testing in the engineering. With regard to this situation, this paper introduces a feasible method appli...
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With the growing complexity of modern embedded software it is less feasible for testers to execute the complete path coverage testing in the engineering. With regard to this situation, this paper introduces a feasible method applied to the critical path coverage testing. In this method, the critical path selection of the program tested is implemented with the algorithm for generating All Path Matrix (APM) in Activity on Edge (AOE) network. Then testers fulfills the test with the help of the analysis of Linear Coded Sequence and Jump (LCSAJ). Experiment results show that this method can reduce greatly the costs of software testing and improve significantly the testing efficiency under the precondition of assuring the software reliability.
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