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SAIMechE Central Techo Dinner: "Designing Truck Semi-trailers for Safe Dynamic Performance"
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The SAIMechE Central Branch Chairman and Committee would like to invite you to the third lecture in a series of technical presentations, focusing on the latest research on road transport as conducted by post graduate students at the University of the Witwatersrand.

When: 28 March 2018
17h45 for 18h00
Where: ECSA Offices
Waterview Corner
2 Ernest Oppenheimer Avenue,
Bruma 2026
South Africa
Contact: Jenny Fuller

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The third topic on "Designing Truck Semi-trailers for Safe Dynamic Performance" - will be presented by Jarryd Deiss, MSC candidate, 
School of Mechanical, Industrial & Aeronautical Engineering, Faculty of Engineering and the Built Environment.

*Attendance is free for members. Registration is compulsory. 
* Dinner and drinks will be served afterwards.
*CPD credits will be awarded (details to be provided shortly).

Synopsis: Designing Truck Semi-trailers for Safe Dynamic Performance

The Performance Based Standards (PBS) framework legislates the rollover and road-width-usage performance of heavy vehicles. The length and mass of the vehicle can therefore be increased. These larger, more productive PBS vehicles can only be operated by RTMS (Road Transport Management System) accredited operators. This PBS approach is currently being piloted as a demonstration project in South Africa. As of June of 2017, 245 PBS vehicles are operational with a 39% lower crash rate relative to conventionally-designed vehicles; testament to their improved safety. The PBS framework defines the safe performance envelope of vehicles but does not optimise their safety and productivity. The design process to achieve the optimal productivity of PBS vehicles is highly iterative. An initial design is evaluated using multi-body dynamics simulation. If the required PBS performance is not achieved, iterative modifications are made to improve the design until the required PBS performance is achieved.

The process is costly and time-consuming. In this study, we characterise the relative influence of a selection of vehicle design parameters, most notably; tractor wheelbase, trailer wheelbase, hitch point location and suspension stiffness on the PBS performance of a baseline truck semi-trailer. The results of this study provide insight into which of these design parameters should be focused on when optimising the productivity of a vehicle while maintaining the required safety performance. This presentation explores the RTMS self-regulation accreditation scheme, PBS framework and results of the study performed on the relative influence of vehicle design parameters on overall PBS performance of a baseline truck semi-trailer.

About Jarryd

Jarryd Deiss is a researcher at Wits. He completed his undergraduate degree at the Wits School of Mechanical, Industrial and Aeronautical Engineering. After graduating top of the mechanical engineering class in 2013, he entered the water treatment industry at WEC projects as a design engineer, working on projects involving small package plants and municipal water treatment.

Dr. Frank Kienhöfer approached him in 2015 with the opportunity to pursue his MSc in vehicle dynamics while simultaneously being trained in assessing heavy vehicles using a performance-based standards (PBS) approach. He began work as a researcher at Wits university in 2016 and subsequently became an accredited PBS assessor by the end of 2016.

As an accredited PBS assessor, he performs PBS assessments for industry working alongside the South African Department of Transport and CSIR in promoting high capacity vehicles using PBS. He is currently working part-time on his MSc with a focus on the safety performance of high capacity vehicles.

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