Article 20313

Title of the article

EXPERIMENT-CALCULATED ASSESSEMENT OF BUS BODY PASSIVE SAFETY 

Authors

Orlov Lev Nikolaevich, Doctor of engineering sciences, professor, head of sub-department of trucks and tractors, Nizhny Novgorod State Technical University named after R. E. Alekseev (24 Minin street, Nizhny Novgorod, Russia), boris.reutov@gmail.ru
Tumasov Anton Vladimirovich, Candidate of engineering sciences, associate professor, sub-department of trucks and tractors, Nizhny Novgorod State Technical University named after R. E. Alekseev (24 Minin street, Nizhny Novgorod, Russia), anton.tumasov@gmail.com
Gerasin Andrey Vladimirovich, Postgraduate student, Nizhny Novgorod State Technical University named after R. E. Alekseev (24 Minin street, Nizhny Novgorod, Russia), veselo_85@mail.ru 

Index UDK

629.113 

Abstract

Background. The problem of reducing severity of road traffic accidents (RTA) is always relevant.Particular attention is paid to improving the passive safety of buses, as accidents involving passenger vehicles are characterized by severe injuries and wounds, obtained by the passengers in an accident. It is well known that one of the most dangerous types of rollover accidents is characterized by high dynamic loads acting on the bus body constriction. The safety requirements for passenger carrying systems of large vehicles are regulated by ECE Regulation number 66, involving the assessment of passive safety as by the results of the calculations and also by the results of computer simulations. Usually full-scale bus rollover simulating tests require high material costs. In this regard, currently the computational methods implementing a reliable virtual simulation of the emergency conditions of body structures loading play a significant role in the assessment of passive safety. However, special consideration should be given to the adequacy of the study design model when using computational techniques. The main purpose of the study is to confirm the legitimacy of the practical application of the computer simulation results on conditions of separate sections and bus body rollover with the use of their detailed finite element models to assess the passive safety of buses.
Materials and methods. Validity confirmation of the computer simulation results is carried out on the basis of a comparative analysis of the calculation results with the experimental studies of the body sections behavior under the influence of emergency bus load. The calculation procedure involves the formation of section patterns, the conditions of their attachment and loading, carrying out of non-linear analysis using modern software tools, analysis of the results. Bench tests of separate sections was conducted in the laboratory of "Automobiles and Tractors" Department of NNSTU with the use of unique equipment that allows to reproduce the loading conditions of sections in accordance with the requirements of Regulation number 66.
Results. The new computational and experimental dependences of the failure loads and deformations with good convergence in the experimental studies were obtained. On the basis of these calculations the bus body safety assessment was made.
Conclusions. The validity of the computer simulation results was proved by comparing the calculated and experimental data on individual body sections. The reasonableness of the proposed settlement and an experimental methodology for assessing of the bodies safety during designing and final stages, as well as in the development of their modifications was proved. 

Key words

passive safety, bus, body section, load bearing capacity, tests, computer simulation. 

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References

1. Orlov L. N. Otsenka passivnoy bezopasnosti, prochnosti kuzovnykh konstruk-tsiy avtomobiley i avtobusov: monografiya [Assessment of passive safety and strength of automobile and bus body constructions: monograph]. Nizhny Novgorod: Izd-vo NGTU, 2005, 230 p.
2. Orlov L. N., Tumasov A. V., Kochanov E. V., Bagichev S. A., Naumov E. A. Osnovy razrabotki konechno-elementnykh modeley kuzovnykh konstruktsiy avtotransportnykh sredstv. Raschety na bezopasnost' i prochnost': ucheb. posobie [Development basics of finite-element models of autotransport body constructions. Safety and strength calculations: tutorial]. Nizhny Novgorod: NGTU, 2009, 153 p.
3. Tumasov A. V., Orlov L. N., Rogov P. S. et al. Trudy Nizhegorodskogo gosudarstvennogo tekhnicheskogo universiteta im. R. E. Alekseeva [Proceedings of Nizhny Novgorod State Technical University named after R.E. Alekseev]. Nizhny Novgorod, 2012, no. 3 (96), pp. 150–156.

 

Дата создания: 28.08.2014 14:08
Дата обновления: 29.08.2014 11:11