Details
| Original language | English |
|---|---|
| Title of host publication | European Wind Energy Conference and Exhibition 2008 |
| Pages | 1045-1056 |
| Number of pages | 12 |
| Publication status | Published - 2008 |
| Event | European Wind Energy Conference and Exhibition 2008, EWEC 2008 - Brussels, Belgium Duration: 31 Mar 2008 → 3 Apr 2008 |
Publication series
| Name | European Wind Energy Conference and Exhibition 2008 |
|---|---|
| Volume | 2 |
Abstract
The structural design of sandwich towers for wind energy converters is presented in this paper. This new kind of hybrid tower consists of two steel shells which are bonded together with a core material. Compared to a steel tower section the shell thickness is splitted to an inner and outer steel face. The core between the inner an outer steel face increases the stability of the shells. It works together like a sandwich or composite shell. Different composite shell theories are used to estimate the stability of such double skin shell constructions. A model scale test series with sandwich cylinders is carried out to analyse the shell buckling and the influence of different core materials. The test specimens are loaded by uniform axial compression. The deformations and strains are measured online by optical 3D sensors to localize critical zones. The experimental results are compared to numerical simulations including measured geometrical imperfections. The FEmodel is validated by a composite shell theory. Within a numerical pre-design the use of high strength steels for the inner and outer steel face is also considered to compare various types of tower configurations. The goal is to find the best combination of steel faces with a core material in the ultimate limit state. However, the fatigue limit state must be also considered. Therefore, a method for post weld treatment will be presented to increase the fatigue strength of the steel faces. Furthermore, new joint techniques are also suggested for hybrid tower constructions with sandwich sections.
Keywords
- Fatigue, Grouted connection, Hybrid, Sandwich, Shell buckling, Tower
ASJC Scopus subject areas
- Energy(all)
- Energy Engineering and Power Technology
- Energy(all)
- Renewable Energy, Sustainability and the Environment
Sustainable Development Goals
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European Wind Energy Conference and Exhibition 2008. 2008. p. 1045-1056 (European Wind Energy Conference and Exhibition 2008; Vol. 2).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Structural design of hybrid-towers for wind energy converters
AU - Schaumann, Peter
AU - Keindorf, Christian
PY - 2008
Y1 - 2008
N2 - The structural design of sandwich towers for wind energy converters is presented in this paper. This new kind of hybrid tower consists of two steel shells which are bonded together with a core material. Compared to a steel tower section the shell thickness is splitted to an inner and outer steel face. The core between the inner an outer steel face increases the stability of the shells. It works together like a sandwich or composite shell. Different composite shell theories are used to estimate the stability of such double skin shell constructions. A model scale test series with sandwich cylinders is carried out to analyse the shell buckling and the influence of different core materials. The test specimens are loaded by uniform axial compression. The deformations and strains are measured online by optical 3D sensors to localize critical zones. The experimental results are compared to numerical simulations including measured geometrical imperfections. The FEmodel is validated by a composite shell theory. Within a numerical pre-design the use of high strength steels for the inner and outer steel face is also considered to compare various types of tower configurations. The goal is to find the best combination of steel faces with a core material in the ultimate limit state. However, the fatigue limit state must be also considered. Therefore, a method for post weld treatment will be presented to increase the fatigue strength of the steel faces. Furthermore, new joint techniques are also suggested for hybrid tower constructions with sandwich sections.
AB - The structural design of sandwich towers for wind energy converters is presented in this paper. This new kind of hybrid tower consists of two steel shells which are bonded together with a core material. Compared to a steel tower section the shell thickness is splitted to an inner and outer steel face. The core between the inner an outer steel face increases the stability of the shells. It works together like a sandwich or composite shell. Different composite shell theories are used to estimate the stability of such double skin shell constructions. A model scale test series with sandwich cylinders is carried out to analyse the shell buckling and the influence of different core materials. The test specimens are loaded by uniform axial compression. The deformations and strains are measured online by optical 3D sensors to localize critical zones. The experimental results are compared to numerical simulations including measured geometrical imperfections. The FEmodel is validated by a composite shell theory. Within a numerical pre-design the use of high strength steels for the inner and outer steel face is also considered to compare various types of tower configurations. The goal is to find the best combination of steel faces with a core material in the ultimate limit state. However, the fatigue limit state must be also considered. Therefore, a method for post weld treatment will be presented to increase the fatigue strength of the steel faces. Furthermore, new joint techniques are also suggested for hybrid tower constructions with sandwich sections.
KW - Fatigue
KW - Grouted connection
KW - Hybrid
KW - Sandwich
KW - Shell buckling
KW - Tower
UR - http://www.scopus.com/inward/record.url?scp=84870014621&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84870014621
SN - 9781615671151
T3 - European Wind Energy Conference and Exhibition 2008
SP - 1045
EP - 1056
BT - European Wind Energy Conference and Exhibition 2008
T2 - European Wind Energy Conference and Exhibition 2008, EWEC 2008
Y2 - 31 March 2008 through 3 April 2008
ER -