Andreas F. Haselsteiner

Andreas F. Haselsteiner
Universität Bremen | Uni Bremen · Department of Production Engineering

Dr.-Ing.

About

38
Publications
8,734
Reads
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268
Citations
Citations since 2016
30 Research Items
263 Citations
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Introduction
Andreas F. Haselsteiner currently works at University of Bremen. His research is focused on wind turbines, the offshore environment and on mechanical design.

Publications

Publications (38)
Article
According to design standards, offshore wind turbines need to withstand environmental loads with a return period of 50 years. This work compares the extreme response along the 50-year environmental contour with the true 50-year wind turbine response. It was found that the environmental contour method that is currently described in the IEC design st...
Article
Full-text available
This update to virocon introduces a heavily changed software architecture and major new functionality. The original software “ViroCon” was released in 2018 and comprised two Python software packages: one package titled “viroconcom” that contained the statistical methods and one package titled “viroconweb”, which provided a web-based graphical user...
Article
Full-text available
Environmental contours are used to simplify the process of design response analysis. A wide variety of contour methods exist; however, there have been a very limited number of comparisons of these methods to date. This paper is the output of an open benchmarking exercise, in which contributors developed contours based on their preferred methods and...
Article
Metocean conditions change slowly, over the course of hours, sometimes even days, as storms develop and swells travel across the globe. Thus, measurements of these conditions are often serially correlated. However, many commonly employed methods for predicting metocean conditions for engineering design analyses are built upon an assumption of stati...
Conference Paper
Single blade installation presents a significant challenge in the installation of offshore wind turbines. The stochastic nature of wind speed and wave height lead to uncertainties during installation. Blade installation is especially difficult in the presence of large relative motions between the blade root and the hub of the nacelle. In a measurem...
Conference Paper
Most offshore wind turbines are installed using the so-called single blade installation procedure. This means that after the tower, nacelle, and hub are installed, the rotor blades are mounted individually. This process step is difficult and sometimes leads to delays because relative motions between the hub and rotor blade need to be small and pred...
Article
Environmental contours are often used to define design loads acting on a marine structure. An environmental contour describes joint extremes of variables such as wave height, wave period and wind speed that are exceeded with a target return period. These extreme environmental conditions should lead to a structural response with a similar return per...
Preprint
Full-text available
The kinematics of offshore wind turbines are of great importance when installing the turbines, as the motions of the components during craning operations are a limiting factor. Most critical is the installation of the blades: the blade's bolts need to be inserted into the rotor flange, an operation that requires great precision. Both the blade and...
Conference Paper
Estimating extreme environmental conditions remains a key challenge in the design of offshore structures. This paper describes an exercise for benchmarking methods for extreme environmental conditions, which follows on from an initial benchmarking exercise introduced at OMAE 2019. In this second exercise, we address the problem of estimating extrem...
Presentation
Full-text available
A presentation describing how to use the open source Python software package "virocon" to compute environmental contours when designing an offshore wind turbine.
Article
Full-text available
Various methods have been proposed for defining an environmental contour, based on different concepts of exceedance probability. In the inverse first-order reliability method (IFORM) and the direct sampling (DS) method, contours are defined in terms of exceedances within a region bounded by a hyperplane in either standard normal space or the origin...
Presentation
Full-text available
Invited talk at ForWind Oldenburg seminar
Conference Paper
During single blade installation in offshore wind farms, relative motion between nacelle and blade root due to wind and wave excitation pose a significant challenge. Wave excitation can be modelled considerably well by employing state-of-the-art simulation tools and can, therefore, be included in installation planning. Other phenomena, such as flow...
Conference Paper
Applications such as the design of offshore wind turbines requires the estimation of the joint distribution of variables like wind speed, wave height and wave period. The joint distribution can then be used, for example, to define design load cases using the environmental contour method. Often the joint distribution is described using so-called glo...
Article
In the design process of marine structures like offshore wind turbines the long-term distribution of significant wave height needs to be modelled to estimate loads. This is typically done by fitting a translated Weibull distribution to wave data. However, the translated Weibull distribution often fits well at typical values, but poorly at high wave...
Preprint
Full-text available
Applications such as the design of offshore wind turbines requires the estimation of the joint distribution of variables like wind speed, wave height and wave period. The joint distribution can then be used, for example, to define design load cases using the environmental contour method. Often the joint distribution is described using so-called glo...
Preprint
Full-text available
Various methods have been proposed for defining an environmental contour, based on different concepts of exceedance probability. In the inverse first-order reliability method (IFORM) and the direct sampling (DS) method, contours are defined in terms of exceedances within a region bounded by a hyperplane in either standard normal space or the origin...
Preprint
Full-text available
In the design process of marine structures like offshore wind turbines the long-term distribution of significant wave height needs to be modelled to estimate loads. This is typically done by fitting a translated Weibull distribution to wave data. However, the translated Weibull distribution often fits well at typical values, but poorly at high wave...
Preprint
Full-text available
During single blade Installation in offshore wind parks, relative motion between nacelle and blade root due to wind and wave excitation pose a significant challenge. While wave excitation can be modelled considerably well by employing state of the art simulation tools and can, therefore, be included in installation planning, other phenomena such as...
Article
Full-text available
The design of various products is driven by requirements that describe extremes. In marine structural design, joint extremes of environmental variables like wave height and wind speed are used to define load cases. Similarly, in ergonomic design minimum and maximum values of anthropometric variables are considered to make sure a product is suitable...
Article
Offshore wind energy is experiencing rapid development and is expected to make up an even bigger part of the world's future energy mix. New installation concepts for offshore wind farms involve lifting operations of wind turbine components from floating vessels. These installation concepts will only be economic if the lifting operations are perform...
Article
Full-text available
The environmental contour method is used by researchers and practitioners to define multivariate extremes of environmental conditions. These extreme conditions are then used to design or analyze marine structures. Here, we present a software called ViroCon, which implements different environmental contour methods. ViroCon is separated into two pack...
Conference Paper
Full-text available
An offshore wind turbine needs to withstand the environmental loads, which can be expected during its life time. Consequently, designers must define loads based on extreme environmental conditions to verify structural integrity. The environmental contour method is an approach to systematically derive these extreme environmental design conditions. T...
Article
Full-text available
We describe and explain new advancements in the design of the aerodynamic force platform, a novel instrument that can directly measure the aerodynamic forces generated by freely flying animals and robots. Such in vivo recordings are essential to better understand the precise aerodynamic function of flapping wings in nature, which can critically inf...
Article
Full-text available
Environmental contours are an established method in probabilistic engineering design, especially in ocean engineering. The contours help engineers to select the environmental states which are appropriate for structural design calculations. Defining an environmental contour means enclosing a region in the variable space which corresponds to a certai...
Article
Die Windenergie hat sich zu einer etablierten Technologie für die Stromerzeugung aus erneuerbaren Energien entwickelt. Allerdings sind in Deutschland geeignete Flächen für die Installation von Onshore-Windenergieanlagen beschränkt bzw. häufig schon bebaut. Folglich werden Offshore-Windenergieparks in Zukunft eine Schlüsselrolle für die Stromerzeugu...
Presentation
Abstract: Flapping wings enable flying animals and biomimetic robots to generate elevated aerodynamic forces. Measurements that demonstrate this capability are based on experiments with tethered robots and animals, and indirect force calculations based on measured kinematics or airflow during free flight. Remarkably, there exists no method to measu...
Poster
Birds dynamically change the shape of their wing during the stroke to support their body weight aerodynamically. The wing is partially folded during the upstroke, which suggests that the upstroke of birds might not actively contribute to aerodynamic force production. This hypothesis is supported by the significant mass difference between the large...
Article
Full-text available
Flapping wings enable flying animals and biomimetic robots to generate elevated aerodynamic forces. Measurements that demonstrate this capability are based on tethered experiments with robots and animals, and indirect force calculations based on measured kinematics or airflow during free flight. Remarkably, there exists no method to measure these f...
Article
Tiger beetles are fast diurnal predators capable of chasing prey under closed-loop visual guidance. We investigated this control system using statistical analyses of high-speed digital recordings of beetles chasing a moving prey dummy in a laboratory arena. Correlation analyses reveal that the beetle uses a proportional control law in which the ang...
Technical Report
Gegenstand dieser Arbeit ist die Evaluation des Einsatzes der ungekühlte Infrarotkamera A655sc zur Visualiserung von Strömungseffekten im Transsonsichen Windkanal Göttingen sowie die Automatisierung der Messungen. Insbesondere von Interesse ist die Transitionsdetektion. Die Untersuchungen werden an einem mit drucksensitiver Farbe beschichteten Stah...
Conference Paper
Full-text available
Infrarotthermographie eignet sich gut zur einfachen Detektion der laminar-turbulenten Transition bei Windkanalversuchen. Diese optische Messtechnik lässt sich gut in bestehende Messketten integrieren. Im Transsonischen Windkanal Göttingen wurden ungekühlte Infrarotkameras bei Messkampagnen mit unterschiedlichen Windkanalmodellen getestet. Diese sin...
Presentation
Full-text available
Abstract: When a beetle chases its prey, what laws does it follow, if any? Theoretically, there are multiples strategies that a beetle could use to intercept its prey. By analyzing the pursuit dynamics of Tiger beetles, we found that the beetle adjusts its orientation to minimize the angle between its heading and the prey. The adjustment is linearl...
Poster
Tiger beetles perform visually-guided pursuit of prey, but run so fast that the prey image suffers too much motion blur and lacks enough contrast for the guidance system. The beetle must stop 3-4 times during pursuit before capturing the prey. When chasing high-contrast prey dummies, however, beetles are able to chase prey continuously under closed...

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Projects

Projects (3)
Project
We aim at improving our understanding of wind turbine vibrations at different stages of a turbine's life cycle. Utilizing IoT motion sensors, we will measure the structural dynamics of a large fleet of wind turbines. Utilizing the awesome power of OpenFOAM we will conduct FSI CFD simulations based on the conditions recorded at the site of the sensorized wind turbines, hopefully revealing hidden dynamics and connections between the wind field and the structural responses of the turbines.
Project
Investigate the physical causes of oscillations in offshore wind turbines undergoing installation.
Archived project
The objective of the project is to develop an innovative and safe installation and logistics concept. Therefore, new transport and lifting concepts for wind turbine components of 6-MW turbines at the North Sea will be developed in order to face conditions of a significant wave height of 2.0 m. The results will be demonstrated on a real offshore site. The research objectives within these project include a significant improvement of the present logistics concepts as well as the development of basics and technologies for the future use of feeder vessel concepts.