publication . Bachelor thesis . 2016

Characterisation of alpine skis

Wikerman, Fredrik;
Open Access English
  • Published: 01 Jan 2016
  • Publisher: KTH, Lättkonstruktioner
  • Country: Sweden
Abstract
Skiing is a fast and competitive sport where skiers must push their performance limit to win medals, the di↵erence can be within hundreds of a second. Therefore, technical improvements are essential for assisting in the skier’s improvement. This thesis project is a joint project between KTH and the Swedish Ski Association and Swedish Ski Team with the purpose of obtaining a better understanding of the structural properties of alpine skis, aiming to improve the individual selection process of skis for the Swedish World Cup Skiers. The goal of the project is to develop and evaluate a method to characterize alpine skis in form of two main structural properties rela...
Subjects
free text keywords: Engineering and Technology, Teknik och teknologier
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1 Introduction 1 1.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Modern skis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 The Swedish Ski Association's ski selection process . . . . . . . . . . . . . . . . . 3 1.4 Literature Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.1 Subjective evaluation of the performance of alpine skis and correlations with mechanical properties . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.2 Design of alpine skis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.3 Structural behavior for slalom skis in bending and torsion . . . . . . . . . 5 1.5 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Method 7 2.1 Code overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Bending sti↵ ness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2.1 Euler-Bernoulli beam theory and finite element theory . . . . . . . . . . . 8 2.3 Torsional sti↵ ness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.1 Saint Venant torsion theory . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Test cases and Results 21 4.1 Bending sti↵ ness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.2 Torsional sti↵ ness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.3 Ski cross section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

[1] Technical Committee ISO/TC 83. ISO 6289:2003(en), Skis - Vocabulary. Int. Stand., Second edition, 2003.

[2] Technical Committee ISO/TC 83. ISO 5902:2013(E) Alpine skis - Determination of elastic properties. Int. Stand., Second edition, 2013.

[3] Alison Audrey. Design of alpine skis. PhD thesis, 1999.

[4] Austria Austrian Standart Organisation (Osterreichisches Normungsinstituti, Vienna. Alpinski, Elastische Eigenschaften, Labormessverfahren, 1977.

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