Browsing by UP Author "Grabe, Petrus Johannes"

Browsing by UP Author "Grabe, Petrus Johannes"

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  • Advancing the digital railway with 4IR technologies 
    Grabe, Petrus Johannes; Mpye, Godisang David; Vandoorne, Rick; Broekman, Andre; Pienaar, Daniel; Hawley, Chad; Van Schalkwyk, Hein (South African Institution of Civil Engineering, 2021-05)
    The launch of Engineering 4.0 on 30 November 2020 at the University of Pretoria’s Hillcrest campus marked the start of an ambitious endeavour to realise data-driven smart cities and transportation networks.
  • Application of a modern laser technique to evaluate the performance of recycled railway ballast 
    Mvelase, G.M.; Anochie-boateng. J.K.; Grabe, P.J. (Hannes) (South African Institution of Civil Engineering, 2022-12)
    The performance of railway track structure is influenced by the ballast shape properties including roundness, flatness, elongation, sphericity, angularity and surface texture. The challenge is how to accurately measure ...
  • Application of laser based technology to quantify shape properties of railway ballast 
    Grabe, Petrus Johannes; Mvelase, Gculisile Mavis; Anochie-Boateng, Joseph K.; Southern African Transport Conference (31st : 2012 : Pretoria, South Africa); Minister of Transport, South Africa (Document Transformation Technologies, July 2012)
    Paper presented at the 31st Annual Southern African Transport Conference 9-12 July 2012 "Getting Southern Africa to Work", CSIR International Convention Centre, Pretoria, South Africa.
  • Application of unsaturated soil mechanics – two years on 
    Gaspar, Tiago Alexandre Valentim; Vandoorne, Rick; Jacobsz, Schalk Willem; Heymann, Gerhard; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2021-04)
    In recent years, technological advancements in the field of unsaturated soil mechanics have helped improve understanding in this field for both researchers and engineering practitioners. Gaspar & Jacobsz (2019) ...
  • Axle load and track deflection on a heavy haul line 
    Vorster, Daniel Jacobus; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2010-05)
    No abstract available.
  • Centrifuge modelling of railway embankments under static and cyclic loading 
    Vorster, P.; Grabe, Petrus Johannes; Jacobsz, Schalk Willem (Southern African Institute for Industrial Engineering, 2017-09)
    With past embankment failures on the heavy haul coal export railway line between Ermelo and Richards Bay in South Africa, a study was conducted focusing on the modelling of embankments in a geotechnical centrifuge. This ...
  • Characterisation of rigid polyurethane foam‑reinforced ballast through cyclic loading box tests 
    Du Plooy, R.F.; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2017)
    As train speeds and heavy haul axle loads constantly increase due to market demands, so do the stresses and strains experienced by track structures. This is especially true for track transitions that generate high dynamic ...
  • Characterising railway substructure layers for rehabilitation design 
    Grabe, Petrus Johannes; Van Vreden, Pieter H.; Hartman, Anton M.; Southern African Transport Conference (31st : 2012 : Pretoria, South Africa); Minister of Transport, South Africa (Document Transformation Technologies, July 2012)
    Paper presented at the 31st Annual Southern African Transport Conference 9-12 July 2012 "Getting Southern Africa to Work", CSIR International Convention Centre, Pretoria, South Africa.
  • Condition monitoring of train wheels using a cost-effective smart rail pad 
    Van Schalkwyk, Marco Heinrich; Grabe, Petrus Johannes (IOP Publishing, 2022-09)
    This present paper focuses on the condition monitoring of train wheels utilizing an 3D printed rail pad that is embedded with widely available accelerometers and a strain gauge. This smart rail pad was used on a heavy haul ...
  • Consideration of the elastic strain recovery rates of the formation layers of a railway track 
    Vandoorne, Rick; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2015-05)
    Maintenance makes up a significant portion of the total life cycle costs of a railway track. The condition of the formation layers of a railway track dictates these maintenance costs to a large extent. The purpose ...
  • The development of a simplified track modulus calculation procedure 
    Mostert, Louis; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2013-05)
    With the constantly increasing demand for heavy freight transportation, railways have become an extremely important element in the economic wellbeing of any country, and particularly in a developing country like South ...
  • The development of suitable cyclic loading and boundary conditions for ballast box tests 
    Jideani, Timothy Chimnyere Uchechukwu; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2019-12)
    Laboratory tests on ballast give insight into the behaviour and performance of the ballast layer under passenger and heavy-haul traffic. It is important, however, to ensure that the simulation of train loads on the ballast ...
  • The effect of increased axle loading on the behavior of heavily overconsolidated railway foundation materials 
    Mpye, Godisang David; Grabe, Petrus Johannes (Elsevier, 2021-03)
    The benefits of increased axle loading in the railway industry are well-appreciated to such an extent that increased axle loading has become a themed topic of interest across all disciplines of railway engineering. However, ...
  • The effects of fastening strength on the variation in stress-free temperature in continuous welded rail 
    Grabe, Petrus Johannes; Jacobs, Dylan (Sage, 2016-03)
    Continuous welded rail (CWR) is a fundamental component of any modern track structure and has several advantages over former types of rail joining processes. The reduction in maintenance and related costs has become the ...
  • Effects of principal stress rotation on resilient behavior in rail track foundations 
    Grabe, Petrus Johannes; Clayton, C.R.I. (American Society of Civil Engineers, 2014-02)
    The design of a railway track substructure requires a realistic understanding of the resilient behavior of the underlying track foundation materials, namely, the subballast and subgrade layers. Currently, the best available ...
  • The effects of under-sleeper pads on sleeper-ballast interaction 
    Grabe, Petrus Johannes; Mtshotana, Babalwa F.; Sebati, Martha M.; Thunemann, E. Quintin (South African Institution of Civil Engineering, 2016-06)
    Under-sleeper pads (USPs), typically made from polyurethane, are used by railways in certain parts of the world to reduce ballast settlement and consequently lengthen the ballast tamping cycle. The rationale behind this ...
  • Experimental characterisation of railway wheel squeal occurring in large-radius curves 
    Fourie, Daniel Johannes; Grabe, Petrus Johannes; Heyns, P.S. (Philippus Stephanus); Frohling, Robert D. (Sage, 2016)
    Tonal squeal noise (i.e. the high amplitude singing of a railway wheel with pure tone components) is emitted by some trailing inner wagon wheels on heavy haul trains in 1000m radius curves on the iron ore export line in ...
  • Exploring the relationship between vertical and lateral forces, speed and superelevation in railway curves 
    Powell, Alex F.; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2017-09)
    The research described in this paper is based on an experiment which involved running a test train through a curve at various speeds, changing the cant of the curve by tamping and repeating the train runs. The cant was ...
  • Frequency domain model for railway wheel squeal resulting from unsteady longitudinal creepage 
    Fourie, Daniel Johannes; Grabe, Petrus Johannes; Heyns, P.S. (Philippus Stephanus); Fröhling, Robert Desmond (Elsevier, 2019-04)
    Railway wheel squeal is an unresolved noise pandemic facing the railway industry. Wheel squeal results from frictional self-excited vibration occurring in the wheel-rail contact. Solving the problem of squeal requires ...
  • Gautrain state of good repair : three years after the first trains were commissioned 
    Van der Westhuizen, N.J.; Powell, Alex; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2013)
    With government-owned assets and the sustainability of service delivery a primary objective, the "State of Good Repair" of the Gautrain rapid rail system will in future play a fundamental role in determining its quality ...