TY  - CHAP
A1  - Butenweg, Christoph
A1  - Thierauf, G.
ED  - Papadrakakis, M.
ED  - Topping, B.H.V.
T1  - Automatic design of reinforced concrete structures with parallel computing
T2  - Innovative computational methods for structural mechanics
N2  - A concept for the analysis and optimal design of reinforced concrete structures is described. It is based on a nonlinear optimization algorithm and a finite element program for linear and nonlinear analysis of structures. With the aim of minimal cost design a two stage optimization using efficient gradient algorithm is developed. The optimization problems on global (structural) and local (crosssectional) level are formulated. A parallelization concept for solving the two stage optimization problem in minimal time is presented. Examples are included to illustrate the practical use and the effectively of the parallelization in the area of engineering design.
Y1  - 1999
SN  - 1-874672-05-9
U6  - https://doi.org/10.4203/csets.1.14
SP  - 305
EP  - 318
PB  - Saxe-Coburg Publication
CY  - Edinburgh
ER  - 
TY  - CHAP
A1  - Altay, Okyay
A1  - Taddei, Francesca
A1  - Butenweg, Christoph
A1  - Klinkel, Sven
T1  - Vibration mitigation of wind turbine towers with tuned mass dampers
T2  - Wind turbine control and monitoring. (Advances in industrial control)
N2  - Because of its minor environmental impact, electricity generation using wind power is getting remarkable. The further growth of the wind industry depends on technological solutions to the challenges in production and construction of the turbines. Wind turbine tower vibrations, which limit power generation efficiency and cause fatigue problems with high maintenance costs, count as one of the main structural difficulties in the wind energy sector. To mitigate tower vibrations auxiliary measures are necessary. The effectiveness of tuned mass damper is verified by means of a numeric study on a 5 MW onshore reference wind turbine. Hereby, also seismic-induced vibrations and soil–structure interaction are considered. Acquired results show that tuned mass damper can effectively reduce resonant tower vibrations and improve the fatigue life of wind turbines. This chapter is also concerned with tuned liquid column damper and a semiactive application of it. Due to its geometric versatility and low prime costs, tuned liquid column dampers are a good alternative to other damping measures, in particular for slender structures like wind turbines.
Y1  - 2014
SN  - 978-3-319-08412-1 (Print) ; 978-3-319-08413-8 (E-Book)
U6  - https://doi.org/10.1007/978-3-319-08413-8_12
SP  - 337
EP  - 373
PB  - Springer
CY  - Cham ; Heidelberg ; New York ; Dordrecht ; London
ER  - 
TY  - CHAP
A1  - Chanson, Hubert
A1  - Bung, Daniel Bernhard
A1  - Matos, J.
T1  - Stepped spillways and cascades
T2  - Energy dissipation in hydraulic structures / Hubert Chanson (ed.)
Y1  - 2015
SN  - 978-1-138-02755-8 (print) ; 978-1-315-68029-3 (e-Book)
SP  - 45
EP  - 64
PB  - CRC Press
CY  - Boca Raton, Fla. [u.a.]
ER  - 
TY  - CHAP
A1  - Bung, Daniel Bernhard
ED  - Rowinski, Pawel
T1  - Laboratory models of free-surface flows
T2  - Rivers - physical, fluvial and environmental processes
N2  - Hydraulic modeling is the classical approach to investigate and describe complex fluid motion. Many empirical formulas in the literature used for the hydraulic design of river training measures and structures have been developed using experimental data from the laboratory. Although computer capacities have increased to a high level which allows to run complex numerical simulations on standard workstation nowadays, non-standard design of structures may still raise the need to perform physical model investigations. These investigations deliver insight into details of flow patterns and the effect of varying boundary conditions. Data from hydraulic model tests may be used for calibration of numerical models as well. As the field of hydraulic modeling is very complex, this chapter intends to give a short overview on capacities and limits of hydraulic modeling in regard to river flows and hydraulic structures only. The reader shall get a first idea of modeling principles and basic considerations. More detailed information can be found in the references.
KW  - Physical modeling
KW  - Similitude
KW  - Open channels
KW  - Hydraulic structures
Y1  - 2015
SN  - 978-3-319-17718-2 ; 978-3-319-17719-9
U6  - https://doi.org/10.1007/978-3-319-17719-9_9
SP  - 213
EP  - 228
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Meskouris, Konstantin
A1  - Butenweg, Christoph
A1  - Kalker, Ines
A1  - Mistler, Michael
T1  - Numerical simulation of historic masonry buildings
T2  - Antike Erdbeben im alpinen und zirkumalpinen Raum : Befunde und Probleme in archäologischer, historischer und seismologischer Sicht ; Beiträge des Interdisziplinären Workshops Schloss Hohenkammer, 14./15. Mai 2004 = Earthquakes in antiquity in the alpine and circum-alpine region / Gerhard H. Waldherr ; Anselm Smolka (Hrsg.) (Geographica Historica ; 24)
Y1  - 2007
SN  - 978-3-515-09030-8 ; 3-515-09030-4
SP  - 171
EP  - 189
PB  - Franz Steiner Verlag
CY  - Stuttgart
ER  - 
TY  - CHAP
A1  - Fissabre, Anke
A1  - Wilson, Ariane
ED  - Feiglstorfer, Hubert
T1  - "Lehmbaupropaganda" : On the tradition of earth building literature
T2  - Earth Construction and Tradition. Vol. I
Y1  - 2016
SN  - 978-3-900265-34-2
SP  - 47
EP  - 69
PB  - IVA Institut für vergleichende Architekturforschung
CY  - Wien
ER  - 
TY  - CHAP
A1  - Pulini, Paola
A1  - Gligorevic, Snjezana
T1  - WIMAX performance in the airport environment
T2  - Multi-carrier systems & solutions 2009. (Lecture notes in electrical engineering ; 41)
N2  - In this paper, the multicarrier physical layers of WiMAX are evaluated in the context of airport data links. The orthogonal frequency-division multiplexing (OFDM) and orthogonal frequency-division multiple-access (OFDMA) cases are applied to the forward link (FL) and reverse link (RL), respectively. The performance of the so called parking and taxi scenarios is presented for airport communications in C-band. Numerical results show that the proposed scheme brings good performance for both the FL and the RL. For the OFDMA case a structure changing called double-tile is also proposed to improve the system performance.
Y1  - 2009
SN  - 978-90-481-2529-6 (Print) ; 978-90-481-2530-2 (Online)
SP  - 301
EP  - 310
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - CHAP
A1  - Wolff, Nino
A1  - Seefeldt, Patric
A1  - Bauer, Wolfgang
A1  - Fiebig, Christopher
A1  - Gerding, Patrick
A1  - Parow-Souchon, Kai
A1  - Pongs, Anna
A1  - Reiffenrath, Matti
A1  - Ziemann, Thomas
T1  - Alternative application of solar sail technology
T2  - Advances in solar sailing
N2  - The development of Gossamer sail structures for solar sails contributes to a large field of future space applications like thin film solar generators, membrane antennas and drag sails. The focus of this paper is the development of a drag sail based on solar sail technology that could contribute to a reduction of space debris in low Earth orbits. The drag sail design and its connections to solar sail development, a first test on a sounding rocket, as well as the ongoing integration of the drag sail into a triple CubeSat is presented.
Y1  - 2014
SN  - 978-3-642-34906-5 (Print) ; 978-3-642-34907-2 (E-Book)
U6  - https://doi.org/10.1007/978-3-642-34907-2_23
SP  - 351
EP  - 365
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Dachwald, Bernd
A1  - Boehnhardt, Herrmann
A1  - Broj, Ulrich
A1  - Geppert, Ulrich R. M. E.
A1  - Grundmann, Jan-Thimo
A1  - Seboldt, Wolfgang
A1  - Seefeldt, Patric
A1  - Spietz, Peter
A1  - Johnson, Les
A1  - Kührt, Ekkehard
A1  - Mottola, Stefano
A1  - Macdonald, Malcolm
A1  - McInnes, Colin R.
A1  - Vasile, Massimiliano
A1  - Reinhard, Ruedeger
T1  - Gossamer roadmap technology reference study for a multiple NEO Rendezvous Mission
T2  - Advances in solar sailing
N2  - A technology reference study for a multiple near-Earth object (NEO) rendezvous mission with solar sailcraft is currently carried out by the authors of this paper. The investigated mission builds on previous concepts, but adopts a strong micro-spacecraft philosophy based on the DLR/ESA Gossamer technology. The main scientific objective of the mission is to explore the diversity of NEOs. After direct interplanetary insertion, the solar sailcraft should—within less than 10 years—rendezvous three NEOs that are not only scientifically interesting, but also from the point of human spaceight and planetary defense. In this paper, the objectives of the study are outlined and a preliminary potential mission profile is presented.
Y1  - 2014
SN  - 978-3-642-34906-5 (Print) ; 978-3-642-34907-2 (E-Book)
SP  - 211
EP  - 226
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - CHAP
A1  - McInnes, Colin R.
A1  - Bothmer, Volker
A1  - Dachwald, Bernd
A1  - Geppert, Ulrich R. M. E.
A1  - Heiligers, Jeannette
A1  - Hilgers, Alan
A1  - Johnson, Les
A1  - Macdonald, Malcolm
A1  - Reinhard, Ruedeger
A1  - Seboldt, Wolfgang
A1  - Spietz, Peter
T1  - Gossamer roadmap technology reference study for a Sub-L1 Space Weather Mission
T2  - Advances in solar sailing
N2  - A technology reference study for a displaced Lagrange point space weather mission is presented. The mission builds on previous concepts, but adopts a strong micro-spacecraft philosophy to deliver a low mass platform and payload which can be accommodated on the DLR/ESA Gossamer-3 technology demonstration mission. A direct escape from Geostationary Transfer Orbit is assumed with the sail deployed after the escape burn. The use of a miniaturized, low mass platform and payload then allows the Gossamer-3 solar sail to potentially double the warning time of space weather events. The mission profile and mass budgets will be presented to achieve these ambitious goals.
Y1  - 2014
SN  - 978-3-642-34906-5 (Print) ; 978-3-642-34907-2 (E-Book)
SP  - 227
EP  - 242
PB  - Springer
CY  - Berlin [u.a.]
ER  -