This paper discusses the design aspects of bus frontal impact behavior as one of the main subject... more This paper discusses the design aspects of bus frontal impact behavior as one of the main subjects of bus crashworthiness and surveys conditions and results of previous full impact laboratory tests comparing the FEM simulation results carried out on a Hungarian Ikarus bus. Clarifying the adequate background gives possibilities for checking bus passive safety solutions by computer and the best utilizable resolutions can be applied in the standardized production. This paper shows frontal impact test arrangements of a 10 tons’ city bus with three different impact speeds and computer simulation versions of these real tests. It gives possibilities to compare the test results to the requirements of current bus regulations.
The crashworthiness of buses and coaches largely depends on the energy absorbing capability of th... more The crashworthiness of buses and coaches largely depends on the energy absorbing capability of the rectangular tubes not neglecting the importance of the new shape-design and the manufacturing technology. The vehicle industry, in the development process, expansively uses the virtual techniques. In spite of that the final qualification or approval procedure does not allow the usage of this kind of methods widely till now. (The European ECE R66 is the only vehicle regulation in the field of passive safety due to the virtual methods.) For improving and checking the bus rollover safety, many Hungarian achievements can be found from the beginning. This paper tries to set up précised analysis of virtual procedure, detailed initial condition-system for rollover simulation and possible virtual methods are presented too. The future trend in the vehicle regulations is to widen the possible applications of virtual technology (VT) and it is a very sensitive question both for test centres and approval authorities. There are many test centres and engineering offices in Europe which carry out computer control calculations on partials or full-scale bus structure for determining the bus roof strength conformity due to the official ECE 66.01 regulation. In spite of the excellent virtual techniques the test procedures are not adequately validated and controlled; the condition of VT procedures is not clarified.
This paper discusses the design aspects of bus frontal impact behavior as one of the main subject... more This paper discusses the design aspects of bus frontal impact behavior as one of the main subjects of bus crashworthiness and surveys conditions and results of previous full impact laboratory tests comparing the FEM simulation results carried out on a Hungarian Ikarus bus. Clarifying the adequate background gives possibilities for checking bus passive safety solutions by computer and the best utilizable resolutions can be applied in the standardized production. This paper shows frontal impact test arrangements of a 10 tons’ city bus with three different impact speeds and computer simulation versions of these real tests. It gives possibilities to compare the test results to the requirements of current bus regulations.
The crashworthiness of buses and coaches largely depends on the energy absorbing capability of th... more The crashworthiness of buses and coaches largely depends on the energy absorbing capability of the rectangular tubes not neglecting the importance of the new shape-design and the manufacturing technology. The vehicle industry, in the development process, expansively uses the virtual techniques. In spite of that the final qualification or approval procedure does not allow the usage of this kind of methods widely till now. (The European ECE R66 is the only vehicle regulation in the field of passive safety due to the virtual methods.) For improving and checking the bus rollover safety, many Hungarian achievements can be found from the beginning. This paper tries to set up précised analysis of virtual procedure, detailed initial condition-system for rollover simulation and possible virtual methods are presented too. The future trend in the vehicle regulations is to widen the possible applications of virtual technology (VT) and it is a very sensitive question both for test centres and approval authorities. There are many test centres and engineering offices in Europe which carry out computer control calculations on partials or full-scale bus structure for determining the bus roof strength conformity due to the official ECE 66.01 regulation. In spite of the excellent virtual techniques the test procedures are not adequately validated and controlled; the condition of VT procedures is not clarified.
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Papers by Andras Csiszar