PDF | The main objective of the presented study was to compare the effectiveness of two standard test procedures for evaluating bus roof. he main objective of the presented study was to compare the effectiveness of two standard test procedures for evaluating bus roof integrity: the dynamic rollover. EUROPEAN TEST METHODS FOR SUPERSTRUCTURES. OF BUSES AND COACHES. RELATED TO. ECE R66 (THE APPLIED HUNGARIAN CALCULATION.
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Skip to main content. Initially, this paper overviews the current status of rollover accidents and requirement of UN-ECE Regulation 66 which is aimed to improve the bus structure in withstanding the rollover crash. The rigid and strength characteristic of bus superstructure were evaluated. Detailed description of the tested vehicle shall be given by the manufacturer in which: No part of the vehicle which is outside fce residual space at the start of the test e.
All connecting elements between the bays are also arranged exactly as they appear in the actual vehicle. The position of the centre of gravity, the total value of vehicle mass unladen kerb mass, or total effective vehicle mass where restraints are fitted and the distribution and location of masses, as declared by the manufacturer. As a firstt step, st before we go for complete rollover 6r6, the critical cal bus body joints are physically tested same is repeated by simulation approproach ecce we have the correlating results approval is taken n from f ARAI.
The Study of Bus Superstructure Strength Based on ECE R66
For testing the articulated sections as a combination, the sections of the vehicle shall be fixed to each other in such a way that, 2. Every body section shall have at least two bays; 3.
The roll-over test is a very rapid, dynamic process having distinguishable stages, should dce taken into consideration when a roll-over test, its instrumentation rr66 measurement are planned.
As from the official date of entry into force of the 01 series of amendments, no Contracting Party applying this Regulation shall refuse to grant ECE approval under this Regulation as amended by the 01 series of amendments. Testing of Articulated Vehicles In the case of an articulated vehicle, each fce section of the vehicle shall comply with the general requirement specified in Paragraph 5.
Crash Analysis of an amphibious bus according to the ECE R66 regulations
A statement of the total energy E to ecce absorbed by the superstructure, using the formula stated in Paragraph 3.
We do not re-word, summarise, cut or interpret the regulatory documents. All the possible physical contacts between parts of the vehicle shall be taken into account in the mathematical model.
When the stated requirements for the simulation program are met, the simulation of the changes in geometry of the interior structure and comparison with the geometrical shape of the residual space can be evaluated as defined in the Paragraphs 5.
Further work to optimize the bus structure in terms of weight, structural strength and crashworthiness is proposed. Customer Benefit The number of physical tests necessary to prove the wce was significantly reduced by performing the simulations for the bus rollover.
InterRegs: Regulation No. | ECE – United Nations
The decision is cee by the technical service on the basis of the manufacturer’s proposal, considering at least the following: The connecting structures between the bays shall represent the manufacturer’s description of the superstructure see Annex 4, Paragraph 3. The active load shall be applied in the transverse plane containing the centre of gravity of the superstructure vehicle which is perpendicular to the vertical longitudinal centre plane Eec of the vehicle.
A table of the value of the total energy and the values of all its components kinetic energy, internal energy, hourglass energyat time increments of 1 ms covering, at least, the period from first contact with the ground until the maximum deformation is reached, 5.
The individual evaluation of the body sections and their bays. Agree that the modifications made are unlikely to have an appreciable effect and that in any case the modified vehicle type still complies with the requirements of this Regulation and constitutes part of a group of vehicle types together with the approved vehicle type; or 8.
This requirement can be satisfied by the provision of a plot, against time, of the distance between the inside contour of the deformed structure and the periphery of the residual space. Residual space Process Methodology Below option was selected for appro proval and agreed with test agency. During the deformation process the load application plane may, in addition to parallel translation, be allowed to rotate around the axis of intersection of the load application plane with the transverse plane containing the centre of gravity, in order to follow the asymmetric deformation of the superstructure.
The length of a bay is measured in the direction of the longitudinal axis of the vehicle, and is determined by the distance between two planes perpendicular to the VLCP of the vehicle. Finally after the th FE model generation, mass balancing was done to bring g the t global COG as close as possible to the physi ysically calculated COG. The sum of the masses attributed to each bay shall be related to the mass M of the complete vehicle: Help Center Find new research papers in: Terms and Definitions 3.
Crash Analysis of an amphibious bus according to the ECE R66 regulations – Article TechNet Alliance
The bus structures must have sufficient crashworthiness and strength in order to reduce and prevent injuries and fatalities during the rollover accident. In an artificial body section see Paragraph 2. The whole roof structure shall be well represented in the body sections if there are local specialities, 6r6 changing height, air condition installation, gas tanks, luggage carrier, etc.
The above approval mark affixed to a vehicle shows that the vehicle type concerned has, with regard to the strength of the superstructure, been approved in the United Kingdom E11 pursuant to Regulation No.
A body section contains at least two bays connected by representative connecting elements side, roof, and underfloor, structures. The vehicle is repositioned on the four load-cells, with the front wheels chocked to prevent the vehicle rolling forward.
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E66 superstructure shall have the actual dimensions of the bodywork. A bay contains one window or door pillar on each side of the vehicle as well as side wall elements, a section of the roof structure and a section of the floor and underfloor structure. The vehicle type shall be defined by the vehicle manufacturer. Roll-over test on body sections which are representative of the complete vehicle, in accordance with the specifications of Annex 6.
The simulation program shall produce a stable solution, in which the result is independent of the incremental time step.