Christopher de Saxe

Christopher de Saxe
University of Cambridge | Cam · Department of Engineering

PhD, PrEng

About

31
Publications
10,576
Reads
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72
Citations
Additional affiliations
June 2021 - present
University of Cambridge
Position
  • Research Associate
August 2018 - September 2021
University of the Witwatersrand
Position
  • Lecturer
January 2011 - May 2021
Council for Scientific and Industrial Research, South Africa
Position
  • Group Leader
Education
October 2013 - October 2017
University of Cambridge
Field of study
  • Engineering
January 2011 - December 2012
University of the Witwatersrand
Field of study
  • Vehicle dynamics
January 2006 - December 2009
University of the Witwatersrand
Field of study
  • Mechanical engineering

Publications

Publications (31)
Conference Paper
Full-text available
The substantial road maintenance backlog in South Africa, coupled with an inadequate budget allocation, requires high impact solutions in order to preserve the 158 000 km paved road network. Focussing efforts on the heavy vehicles operating on these routes, by ensuring they are more road friendly and payload-efficient, could potentially preserve an...
Conference Paper
Full-text available
Previous research investigating the dynamic road wear produced by heavy vehicles has not included the effect of road crossfall. This study shows that road crossfall, even at values as low as 1%, has a significant effect on the predicted dynamic road wear. A model of a rigid vehicle that includes rolling and pitching motion was developed for the ana...
Conference Paper
Full-text available
Understanding the precise movements of different commodities on South African roads can help in not only describing the logistics sector more accurately, but also in the planning of road infrastructure maintenance and investment. Truck combinations can be classified into several classes broadly associated with different commodity groups, including...
Conference Paper
Full-text available
The paved road network is a critical asset to any country and its economy. South Africa's paved road network has an estimated value in excess of R2 trillion. This asset is threatened by a backlog in maintenance of more than R416.6 billion, estimated in 2018. Overloaded heavy vehicles can cause more than 60% of the road wear on a road network. Most...
Conference Paper
Full-text available
South Africa's national power utility, Eskom, is under heavy strain to maintain an undisrupted electricity supply and contain costs, while at the same time reducing its environmental impact. In 2018/19, Eskom acquired 118 Mt of coal, at a purchase cost of approximately R 47 billion, of which around R7 billion (15%) can be attributed to the transpor...
Conference Paper
Full-text available
Road transport is a highly competitive industry and is renowned for low profit margins. Road transport however accounts for almost 6% of the Gross Domestic Product (GDP) and is the backbone of the economy. The Performance-Based Standards (PBS) or Smart Truck Pilot project has existed in South Africa since 2007 and monitoring data has shown substant...
Article
Full-text available
Articulation angle sensing is an essential component of manoeuvrability and stability control systems for articulated heavy goods vehicles, particularly long combination vehicles. Existing solutions to this sensing task are limited by reliance on trailer modifications or information or by measurement accuracy, or both, restricting commercial adopti...
Article
Full-text available
Articulated heavy goods vehicles and long combination vehicles offer improved efficiency and emissions but reduced low-speed manoeuvrability and high-speed stability compared to rigid lorries. Active control systems can help to address these issues but require additional instrumentation, particularly articulation angle sensing. Existing commercial...
Article
Full-text available
Heavy goods vehicles are overrepresented in cyclist fatality statistics in the United Kingdom relative to their proportion of total traffic volume. In particular, the statistics highlight a problem for vehicles turning left across the path of a cyclist on their inside. In this article, we present a camera-based system to detect and track cyclists i...
Conference Paper
Full-text available
The road space utilised by a heavy goods vehicle during low-speed manoeuvring has direct safety and operational implications. This is especially true for vehicles which are longer/wider than usual, such as abnormal loads vehicles. The same applies to vehicles that are required to meet certain performance-based manoeuvrability criteria, such as thos...
Article
High Capacity Vehicles (HCVs) have been shown to be highly effective in reducing emissions associated with road freight transport. However, the reduced manoeuvrability of long vehicles often necessitates the use of active trailer steering. Path-following trailer steering systems are very effective in this regard, but are currently limited to on-hig...
Article
Full-text available
High-capacity vehicles have been shown to be highly effective in reducing emissions associated with road freight transport. However, the reduced manoeuvrability of long vehicles often necessitates the use of active trailer steering. Path-following trailer steering systems are very effective in this regard, but are currently limited to on-highway ap...
Conference Paper
Full-text available
Application of articulated and Long Combination Vehicles (LCVs) in challenging off-highway applications is possible with the use of path-following trailer steering. This requires an accurate estimate of trailer off-tracking, but it has been shown that that existing methods for this are not applicable on roads with low friction or significant camber...
Conference Paper
Full-text available
Active control systems for heavy goods vehicles (HGVs) are becoming more sophisticated, necessitating more extensive and sophisticated instrumentation. For articulated HGVs, articulation angle sensing is crucial for most such systems and existing and proposed sensing methods are limited either in terms of commercial feasibility or measurement accur...
Conference Paper
Full-text available
As part of a performance-based standards (PBS) research programme for heavy vehicles in South Africa, a need was identified to design, manufacture and operate a number of PBS or Smart Truck demonstration vehicles. The purpose of the demonstration programme is to gain practical experience in the PBS approach and to quantify and evaluate the potentia...
Conference Paper
Full-text available
Until recently, South African car-carriers operated under the abnormal load permit system allowing an additional 300 mm height and 500 mm length. Because car-carrier payloads are divisible and abnormal load permits are usually granted for indivisible loads, these permits were granted only as a special concession to the car-carrier industry. This pr...
Thesis
Full-text available
Until recently, car-carriers in South Africa operated under abnormal load permits allowing a finite relaxation of legal height and length limits. This practice is being phased out, and exemption will only be granted if a car-carrier complies with the Australian Performance-Based Standards (PBS) scheme. A low-speed turning model was developed in Mat...
Conference Paper
Full-text available
The practice of issuing of abnormal load permits to South African car-carriers (allowing a 300 mm increase in height and 500 mm increase in length) is being phased out. Such allowances will only be granted if a car-carrier complies with the Australian Performance-Based Standards scheme, which is currently the basis for a PBS demonstration project i...

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Cited By

Projects

Projects (4)
Project
Electric Road Systems for net zero heavy road freight
Archived project
Delevoping camera-based measurement systems to determine the articulation angle and off-tracking of a trailer, with particular application to heavy goods vehicles and associated control systems.