The use of metamodeling techniques in the design and analysis of computer experiments has progressed remarkably in the past 25 years, but how far has the field really come? This is the question addressed in this paper, namely, the extent to which the use of metamodeling techniques in multidisciplinary design optimization have evolved in the 25 years since the seminal paper on design and analysis of computer experiments by Sacks et al. (“Design and Analysis of Computer Experiments,” Statistical Science, Vol. 4, No. 4, 1989, pp. 409–435). Rather than a technical review of the entire body of metamodeling literature, the focus is on the evolution and motivation for advancements in metamodeling with some discussion on the research itself; not surprisingly, much of the current research motivation is the same as it was in the past. Based on current research thrusts in the field, multifidelity approximations and ensembles (i.e., sets) of metamodels, as well as the availability of metamodels within commercial soft...

Metamodeling in Multidisciplinary Design Optimization: How Far Have We Really Come?

The use of metamodeling techniques in the design and analysis of computer experiments has progressed remarkably in the past two decades, but how far have we really come? This is the question that we investigate in this paper, namely, the extent to which the use of metamodeling techniques in multidisciplinary design optimization have evolved in the two decades since the seminal paper on Design and Analysis of Computer Experiments by Sacks et al. As part of this review, we examine the motivation for advancements in metamodeling techniques from both a historical perspective and the research itself. Based on current thrusts in the field, we emphasize multi-level/multi-fidelity approximations and ensembles of metamodels, as well as the availability of metamodels within commercial software and for design space exploration and visualization in this review. Our closing remarks offer insight into future research directions – nearly the same ones that have motivated us in the past.

Design and analysis of computer experiments in multidisciplinary design optimization: A review of how far we have come - Or not

Optimal design of wheel profile for railway vehicles

Track transitions in railways: A review

There is an increased interest in low-maintenance track designs. The advantages of non-ballasted tracks are considered: reduction of structure height, lower maintenance requirements, increased service life, high lateral track resistance and no churning of ballast particles at high-speed. The design of slab track is discussed. The slab track used on the Shinkansen network in Japan is described. Use of ballastless track in Germany (Rheda system and Bogl slabs), the Netherlands (Rheda system), France (Stedef system, Sonneville Low Vibration track, Swiss Walo system, Edilon block track system) and Italy is reviewed. All of these designs are supported at discrete points (the sleeper principle). A continuously supported rail system, the Embedded Rail Structure, has been used in the Netherlands.

Recent developments in slab track

https://repository.tudelft.nl/islandora/object/uuid%3A9c3542b2-f505-483d-82d2-7e533d057e9c/datastream/OBJ/download

Ballast degradation : Effect of particle size and shape using Los Angeles Abrasion test and image analysis

Combatting RCF on switch points by tuning elastic track properties

https://repository.tudelft.nl/islandora/object/uuid%3A28de8c5b-53df-474d-a6db-58c62fe8c4ab/datastream/OBJ/download

Polyurethane reinforced ballasted track: Review, innovation and challenge

Proper rail geometry in the crossing part is essential for reducing damage on the nose rail. To improve the dynamic behaviour of turnout crossings, a numerical optimisation approach to minimise rolling contact fatigue (RCF) damage and wear in the crossing panel by varying the nose rail shape is presented in the paper. The rail geometry is parameterised by defining several control cross-sections along the crossing. The dynamic vehicle–turnout interaction as a function of crossing geometry is analysed using the VI-Rail package. In formulation of the optimisation problem a combined weighted objective function is used consisting of the normal contact pressure and the energy dissipation along the crossing responsible for RCF and wear, respectively. The multi-objective optimisation problem is solved by adapting the multipoint approximation method and a number of compromised solutions have been found for various sets of weight coefficients. Dynamic behaviour of the crossing has been significantly improved after ...

Valeri Markine

Papers

Optimal design of wheel profile for railway vehicles

Ballast degradation : Effect of particle size and shape using Los Angeles Abrasion test and image analysis

Combatting RCF on switch points by tuning elastic track properties

Polyurethane reinforced ballasted track: Review, innovation and challenge

Improvement of vehicle–turnout interaction by optimising the shape of crossing nose