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STRUCTURAL ANALYSIS OF BLADES Figure E.34: Shear stress perpendicular to fibres in radial (x) direction of the blade Figure E.35: Shear stress parallel to fibres in longtitudal (z) direction of the blade 173
LIST OF ATTACHMENTSSTRUCTURAL ANALYSIS OF BLADES The stresses are summarised and compared to the limit states in table E.14 174 Compressionparallel to grain [MPa] Compressionperpendicular to grain [MPa] Shear parallel to grain [MPa] Shear perpendicular to grain [MPa] Tension perpendicular to grain [MPa] Tension parallel to grain Limit state stress 15 1.6 2.9 0.82 1.0 27 [MPa] Design stress 0.34 0.01 0.02 0.0 0.01 0.06 0.01 0.03 0.51 Table E.14: Summary of results and comparison to limit states The limit state stresses are not exceeded by the design stresses and the structural integrity of the blade is therefore verified for the loads of the present load case. E.9 Load case G Figure E.36: Normal stress parallel to fibres in longtitudal (z) direction of the blade
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WIND TURBINE DESIGN
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ABSTRACT At the request of the Engi
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CONTENTS 1 Introduction ...........
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E Structural analysis of blades ...
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INTRODUCTION members. Today EWB-DK
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INTRODUCTION Figure 1.2: Left pictu
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INTRODUCTION 6
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PROBLEM STATEMENT reconfigured with
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PROBLEM STATEMENT 10
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METHODOLOGY Figure 3.1: Flow chart
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METHODOLOGY 14 3.1 Calculation meth
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CONCEPTUALISATION the kinetic wind
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CONCEPTUALISATION Figure 4.3: (a) D
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CONCEPTUALISATION issues due to tur
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CONCEPTUALISATION 22 Figure 4.8: Ty
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CONCEPTUALISATION � Darrieus 24 F
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CONCEPTUALISATION 26 Figure 4.13: G
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CONCEPTUALISATION Figure 4.14: Powe
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CONCEPTUALISATION 30 ID Requirement
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CONCEPTUALISATION most suitable sol
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CONCEPTUALISATION The embodiment de
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DESIGN PRESENTATION The main dimens
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DESIGN PRESENTATION The design prop
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DESIGN PRESENTATION The background
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ROTOR 42 6.1 Number of blades Moder
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ROTOR 44 Figure 6.4: Blade design s
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ROTOR Table 6.3 provides a material
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ROTOR Figure 6.7 displays the lift
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ROTOR Figure 6.9: Rotor power outpu
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ROTOR 6.2.3 Manufacturing During th
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ROTOR 54 The three sides of the tem
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ROTOR When the carving process is f
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ROTOR 58 Figure 6.17: Blade attachm
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ROTOR 60 Figure 6.19: Rotor power o
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ROTOR 62 Figure 6.22: Efficiency
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ROTOR sidering the output from the
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ROTOR 66
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GENERATOR AND ELECTRICAL SYSTEM 68
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GENERATOR AND ELECTRICAL SYSTEM The
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GENERATOR AND ELECTRICAL SYSTEM Fig
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GENERATOR AND ELECTRICAL SYSTEM 74
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YAW AND FURLING For an upwind wind
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YAW AND FURLING (16), which are bol
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YAW AND FURLING 80 8.2 Furling syst
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YAW AND FURLING 82 8.3 Summary The
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TOWER Concrete tower 84 Figure 9.1:
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TOWER 86 Figure 9.4: Turbulent air
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TOWER Figure 9.7 shows the tower ba
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TOWER models [41, p. 111]. Under ce
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ALTERNATIVE BLADE DESIGN 92 10.1 Ai
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ALTERNATIVE BLADE DESIGN 94 10.3 Su
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DESIGN EVALUATION 96 6 W Low-cost m
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DESIGN EVALUATION Weaknesses 1) The
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FURTHER DEVELOPMENT � Foundation
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FURTHER DEVELOPMENT 102
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CONCLUSION proposal is highly flexi
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NOMENCLATURE Abbreviation Descripti
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NOMENCLATURE Lgs Distance between u
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NOMENCLATURE 110
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BIBLIOGRAPHY [14] Magenn Power Inc.
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BIBLIOGRAPHY [53] H. J. Larsen, H.
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LIST OF ATTACHMENTSBASIS FOR CALCUL
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Page 129 and 130: LIST OF ATTACHMENTSBASIS FOR CALCUL
Page 139 and 140: LIST OF ATTACHMENTSROTOR THEORY Thi
Page 141 and 142: LIST OF ATTACHMENTSROTOR THEORY 134
Page 143 and 144: LIST OF ATTACHMENTSROTOR THEORY Cho
Page 145 and 146: LIST OF ATTACHMENTSROTOR THEORY 138
Page 147 and 148: LIST OF ATTACHMENTSROTOR DESIGN TOO
Page 149 and 150: LIST OF ATTACHMENTSROTOR DESIGN TOO
Page 151 and 152: LIST OF ATTACHMENTSAIRFOIL With the
Page 153 and 154: LIST OF ATTACHMENTSAIRFOIL Complete
Page 155 and 156: LIST OF ATTACHMENTSSTRUCTURAL ANALY
Page 179: LIST OF ATTACHMENTSSTRUCTURAL ANALY
Page 191 and 192: LIST OF ATTACHMENTSBLADE ATTACHMENT
Page 197 and 198: LIST OF ATTACHMENTSSTRUCTURAL VERIF
Page 203 and 204: LIST OF ATTACHMENTSTOWER ANALYSIS T
Page 209 and 210: LIST OF ATTACHMENTSFURLING AND YAW
Page 221 and 222: LIST OF ATTACHMENTSALTERNATIVE AIRF
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LIST OF ATTACHMENTSCOMPLIANCE WITH
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