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Assessment tool for performance of high capacity combination vehicles including envelopes for A-double vehicles

Krishna Kashampur
Göteborg : Chalmers tekniska högskola, 2017. Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, ISSN 1652-8557; 2017:80, 2017.
[Examensarbete på avancerad nivå]

The technological advancements in the automotive industry in past few decades has resulted in a rapid rise in the number of vehicles. In addition to private vehicles, heavy duty vehicles (HDV) have also increased, which play a big part in transporting goods for import, export, and businesses. These rapidly rising numbers, on one hand, contribute to the convenience and development also on the down side contribute to the emissions. In a study conducted in 2017, it was found that 26% of the total CO2 emissions in Europe came from the HDVs and more than 3/4th of these emissions were from the trucks. In the recent years, a lot of research has been done in the commercial vehicle industry that is focused on making transportation more sustainable and to reduce the emissions. One of the well-established ways for achieving sustainability in transportation and lower the emissions is by improving the efficiency of vehicles. Using long combination vehicles (LCV) has been proven as one of the ways of tackling this problem and also addressing the issue of congestion on roads. Currently, the allowed maximum length of HDV in Sweden is 25.25 m. In the case of LCVs two or more trailers are used on the same HDV, thereby increasing the effective length of the vehicle. In countries like Australia, Canada, Mexico and the United States, LCVs known as “Road trains” are being used for efficient movement of freight in the rural areas. Similar to this, it is proposed by the government to bring a legislation in Sweden to permit LCVs. However, designing such vehicles requires consideration of both vehicle and the road traffic. To address these issues of safety, performance and congestion, performance based standards (PBS) have evolved. This thesis work focuses on developing a framework to assess LCVs and provide vehicle manufacturers with allowed ranges for vehicle parameters. The vehicle that complies with these allowed ranges will be permitted on the road. The work done in this thesis project proposes a generic framework considering legal, performance and practical constraints. Thereafter, it can be applied to any LCV to obtain the allowable ranges. The final outcome of the thesis was that the generic framework was applied on an A-double combination vehicle to obtain envelopes. A special study of performance measures for friction demands for low speed maneuvering on low road friction is also included.

Nyckelord: Performance based standard, Heavy combination vehicles, Envelopes, Adouble, Vehicle dynamics, low road friction



Publikationen registrerades 2017-09-28. Den ändrades senast 2017-09-28

CPL ID: 252098

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