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Scientific key qualifications:
· Friction, micro- and nanotribology
· Characterisation of surface structure (texture), e.g. skis, boats, Autosocks, tyres, oil/gas pipes and skates
· Optical contouring/Interferometry
· Measurement and characterisation of snow/ice and snow/ice physics
· Physics, electrostatics, mass and heat transfer, fluid dynamics and continuum mechanics
· Material technology
· Nanotechnology
· Instrumentation
· Image processing
· Applied data and information technology
· Programming
The title of my doctoral thesis is "Some aspects of ski base sliding
friction and ski base structure" and includes the following items:
· Ski base sliding friction theory and development of mathematical models
that expresses the relation between structure, tension and sliding
properties of cross-country skis.
· Development of a PC-based instrument for non-contact measurement of the
structure in a ski sole, SSA - Ski base Structure Analyser.
· Measurements and characterisations of ski base structures with the SSA.
· Measurement and characterisation of snow.
· Verification of ski base structure and sliding friction theory by
execution of accurate sliding tests.
· The effect of electrical charging and electrostatic pressure on ski base
sliding friction.
My work for the "Olympiatoppen" collaboration project "Gliprosjektet",
included snow and weather measurements and ski base structure measurements
prior to and during the Nordic World Championships'97 in Trondheim, Norway,
prior to the 1998 Olympic Winter Games in Nagano, Japan, prior to and
during the 2002 Olympic Winter Games in Salt Lake City, USA, prior
to and during the Nordic World
Championships'2003 in Val di Fiemme, Italy, as well as taking part in the extensive sliding test
programs prior to the four events. In the four events Norwegian athletes competing in sports participating in "Gliprosjektet" won
a total of 59 medals (24 Gold, 20 Silver and 15 Bronze medals).
One of the spin-offs that has turned out as a result of this research, was a
project on surface coating of kayaks, canoes, rowing boats and sailboats. In
the 2000 Summer Olympics in Sydney all the Norwegian kayaks, canoes and boats
were coated by a team from NTNU. The Norwegian kayaking, canoeing, rowing and
sailing teams won two Gold, one Silver and one Bronze medal in these Olympics.
The AutoSock is a newly developed tyre cover made of a special textile fabric,
aimed at increasing tyre-to-road friction when driving cars on icy or snowy roads.
Initial field tests on snow and indoor tests on ice showed that the ice friction
properties had to be improved. Thus, I was engaged by AutoSock to assist on the
following matters in 1999 and 2000:
· To improve the ice friction of the AutoSock without compromising the snow
properties.
· To make use of ”state-of-the-art” knowledge on ski base sliding friction
theory and ski base structures to increase the understanding of friction between
car tyres/AutoSocks and snowy/icy road surfaces.
· To exploit ways to objectively and scientifically describe the surface
texture of different AutoSock prototypes in order to increase the understanding
of the prevailing friction.
· To run several more friction tests on ice and snow of socks with different
material and surface properties.
Through extensive research and testing up to 100% higher values for the average
maximum friction coefficient were achieved on ice. At present the
AutoSock is patented, commercialised and approved by German TÜV (Tecnicher
Überwachungs Verein) as winter aid (“Winternotfahrhilfe”) for passenger vehicles.
Approximately 140 000 pairs of AutoSocks have been sold in Norway, Sweden, Denmark, Finland, Germany, Be-Ne-Lux,
France and Spain, and the product has gained good editorial reviews in automotive magazines, newspapers,
TV and radio in a number of
countries. BMW,
VW,
and Mercedes have accepted the product as to quality, and deliveries to the factories have started.
Fred. Olsen & Co
is the major stockholder in AutoSock AS. Norwegian Tele Textiles AS
and German KoSa GmbH (previously Hoechst Fiber division) are stockholders and
industrial partners regarding yarn and weaving. KoSa GmbH is one of the largest
manufacturers of synthetic yarn in the world. In the future AutoSock AS will
contribute to road safety by offering safety products based on new man-made fibre
that can easily be used by drivers during adverse weather conditions. Through
proprietary technology AutoSock AS will be the leading international supplier
of such road safety products by 2003.
At present the future goal for my friction research is:
· To exploit the knowledge on ski base sliding friction theory and ski base
structures to increase understanding of other related microtribological
processes.
· To combine and exploit scientific knowledge (mathematical models and
experimental results) from different research disciplines in order to
increase understanding of microtribological processes.
· To use the best instrumentation and data processing techniques available
at any time to study friction processes in-situ in order to verify and
develop theoretical friction models.
In 1975 it was estimated that approximately one-third of the energy
consumption in the world appeared as friction in one form or another.
Publications:
Løset, S., D. A. Moldestad, J. Hodne and O. Egeland (1995): Måling av
struktur i skisåle - Fase I. The Norwegian Institute of Technology,
Department of Structural Engineering, Report No. R-8-95, (in Norwegian), 38
p..
Moldestad, D. A. (1995): PC-basert system for måling og valg av
sålestruktur på langrennsski. The Norwegian Institute of Technology,
Department of Engineering Cybernetics, Main thesis (in Norwegian), 82 p..
Moldestad, D. A. (1996): PC-basert system for måling og valg av
sålestruktur på langrennsski. Norwegian University of Science and
Technology NTNU, Department of Structural Engineering. Short version of
main thesis, Report No. R-1-96 (in Norwegian), 19 p..
Moldestad, D. A. (1996): Snø- og værmålinger samt glidetester av
langrennsski i Hakuba, februar 1996. Norwegian University of Science and
Technology NTNU, Department of Structural Engineering, Restricted, Report
No. R-14-96 (in Norwegian), 79 p..
Moldestad, D. A. (1996): Snø- og værmålinger samt glidetester av
langrennsski i Granåsen, vinteren 1996 - Del I. Norwegian University of
Science and Technology NTNU, Department of Structural Engineering,
Restricted, Report No. R-15-96 (in Norwegian), 43 p..
Moldestad, D. A. (1996): Snø- og værmålinger samt glidetester av
langrennsski i Granåsen, vinteren 1996 - Del II. Norwegian University of
Science and Technology NTNU, Department of Structural Engineering,
Restricted, Report No. R-16-96 (in Norwegian), 55 p./3 app..
Moldestad, D. A. and E. Helle (1996): Karakterisering av
overflatetopografi. Norwegian University of Science and Technology NTNU,
Department of Structural Engineering, Preliminary (in Norwegian), 11 p..
Moldestad, D. A., S. Løset and A. Løset (1997): Status Hakuba Ultimo 1997.
Norwegian University of Science and Technology NTNU, Department of
Structural Engineering, Preliminary and restricted (in Norwegian and
English), 4 p./3 app..
Moldestad, D. A. (1998): Essential snow and weather measurements together
with glide test results from Snow Harp, Hakuba, 23. - 28. January 1998.
Norwegian University of Science and Technology NTNU, Department of
Structural Engineering, Preliminary and restricted, 5 p./1 app..
Moldestad, D. A. (1998): Official weather data and forecasts in the period
24. - 28. January 1998 in Snow Harp, Hakuba compared with some of our
weather measurements and remarks. 1 app..
Moldestad, D.A. (1999): Some Aspects of Ski Base Sliding Friction and Ski
Base Structure. Dr. thesis, 1999:137, Norwegian University of Science and
Technology, 198 p.
Løset, S. and D. A. Moldestad (2000): Characterisation of snow structure in
a cross-country race ski track. Proceedings of the Fourth International
Conference on Snow Engineering, Trondheim, Norway, June 19-22 2000, pp.
123-128.
Moldestad, D. A. and S. Løset (2000): Factors affecting ski base sliding friction
on snow. Proceedings of the Fourth International Conference on Snow
Engineering, Trondheim, Norway, June 19-22 2000, pp. 129-135.
Moldestad, D.A. and S. Løset (2000): Evaluation of the AutoSock. Norwegian
University of Science and Technology NTNU, Department of Structural
Engineering, Restricted, Report No. R-10-00, 33 p..
Moldestad, D.A. and S. Løset (2001): The Ski base Structure Analyser (SSA). Proceedings
of the Nordic MATLAB Conference, October 17-18 2001, Oslo, Norway,
pp. II-99-104.
Moldestad, D.A. (2001): Basics of ski base sliding friction. Nytt fra
trenerklubben, oktober 2001 (in English with Norwegian abstract), pp. 40-45.
Moldestad, D.A. and S. Pedersen (2002): Snø- og værmålinger samt glidetester
og strukturmålinger av langrennsski vinteren 2001/02. Norwegian University of
Science and Technology NTNU, Department of Structural Engineering, Preliminary
and restricted (in Norwegian and English), 6 app..
Moldestad, D. A. and S. Løset (2003): The Ski base Structure Analyser (SSA).
Modeling, Identification and Control, Vol. 24, No. 1, pp. 15-26.
Moldestad, D. A. (2003): Nanotribology. On poster presenting NTNU at the
“Nanotech 2003 + Future” International Congress and Exhibition on Nanotechnology,
Tokyo, Japan, February 26 - 28, 2003, 1 p.
Moldestad, D. A. and S. Løset (2003): Friction of the AutoSock on ice.
Proceedings of the POAC (Port and Ocean Engineering under Arctic Conditions)
Conference, June 16-19 2003, Trondheim, Norway (In progress).
Interests:
Sports: Cross-country skiing (19th and 27th in the 3x10 km relay, Norwegian Championships 1998 and 1999), running, kayaking, orienteering and hiking.
Music: U2, Bruce Springsteen, Live, Counting Crows, Midnight Choir, Lloyd Cole, Natalie Merchant, Sinead O'Connor, Dido and Faithless.
Traveling: Visited all continents. Australia, Peru, Easter Island and Western Norway are my favorites so far.
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