Peter Dalhoff
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View article: Designing High‐Performance, Manufacturing‐Friendly Rotor Blades for Micro Wind Turbines via Cambered Plate Airfoil Optimization
Designing High‐Performance, Manufacturing‐Friendly Rotor Blades for Micro Wind Turbines via Cambered Plate Airfoil Optimization Open
Conventional methods for manufacturing rotor blades, such as composite construction and die casting, are hindered by high costs due to expensive molds, while 3D printing often results in poor quality or high production costs with unfavorab…
View article: Yaw control strategies for 20 MW multi-rotor systems
Yaw control strategies for 20 MW multi-rotor systems Open
In this paper, the control of an active yaw system for a 20 MW multi-rotor wind turbine system (MRS) is considered. The MRS under investigation consists of five 4 MW turbines in two rows, which are connected to the tower via a space frame.…
View article: Multi Rotor Wind Turbine Systems: An Exploration of Failure Rates and Failure Classification
Multi Rotor Wind Turbine Systems: An Exploration of Failure Rates and Failure Classification Open
The Multi-Rotor System (MRS) is a proposed solution to the increasing costs associated with the manufacture and maintenance of large single-rotor wind turbines. The MRS consists of many small rotors that can capture the same amount of ener…
View article: Development of a multi rotor floating offshore system based on vertical axis wind turbines
Development of a multi rotor floating offshore system based on vertical axis wind turbines Open
The upscaling of wind turbines results in fewer units per installed MW reducing infrastructure and maintenance costs of offshore wind farms. Multi rotor systems (MRS), comprising many wind turbine rotors on a single support structure, are …
View article: Validation of the dynamic wake meandering model with respect to loads and power production
Validation of the dynamic wake meandering model with respect to loads and power production Open
The outlined analysis validates the dynamic wake meandering (DWM) model based on loads and power production measured at an onshore wind farm with small turbine distances. Special focus is given to the performance of a version of the DWM mo…
View article: Validation of the dynamic wake meandering model with respect toloads and power production
Validation of the dynamic wake meandering model with respect toloads and power production Open
The outlined analysis validates the dynamic wake meandering (DWM) model based on loads and power production measured at an onshore wind farm with small turbine distances. Special focus is given to the performance of a version of the DWM mo…
View article: Simplified approach for the optimal number of rotors and support structure design of a multi rotor wind turbine system
Simplified approach for the optimal number of rotors and support structure design of a multi rotor wind turbine system Open
In this study different multi rotor wind turbine systems (MRSs) are designed in such a way that the space frame, forming the connection between rotor nacelle assemblies (RNAs) and tower, will be modeled and dimensioned as an ideal truss wo…
View article: Extension of the DWM model towards a static model for site-specific load simulations
Extension of the DWM model towards a static model for site-specific load simulations Open
The outlined analysis presents a method to extend the Dynamic Wake Meandering (DWM) model to allow a combination with load approximation methods, which are commonly used to estimate the loads during the planning process of a new wind farm …
View article: Simplified support structure design for multi-rotor wind turbine systems
Simplified support structure design for multi-rotor wind turbine systems Open
In this study different multi-rotor wind turbine systems (MRSs) are designed in such a way that the space frame, forming the connection between rotor nacelle assemblies (RNAs) and the tower, is modeled as an ideal truss work. To dimension …
View article: Comments
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The paper addresses two highly interesting and important topics -loads and O&M of Multirotor systems.Therefore it is seen as highly relevant.The paper appears to be two papers, one on cost modelling (chapter 2) and one on loads (chapter 3)…
View article: Dynamic wake meandering model calibration using nacelle-mounted lidar systems
Dynamic wake meandering model calibration using nacelle-mounted lidar systems Open
Light detection and ranging (lidar) systems have gained a great importance in today's wake characteristic measurements. The aim of this measurement campaign is to track the wake meandering and in a further step to validate the wind speed d…
View article: Comments
Comments Open
The paper is well written.The topic of electrical topologies for MRWT's is novel and only little research has been published on this so far.The method is well described.Uncertainties and assumptions have been outlined clearly.The results l…
View article: Simplified support structure design for multi rotor wind turbine systems
Simplified support structure design for multi rotor wind turbine systems Open
In this study different multi rotor wind turbine systems (MRSs) will be designed in such a way that the space frame, forming the connection between rotor nacelle assemblies (RNAs) and tower, will be modeled as an ideal truss work. To dimen…
View article: Measuring dynamic wake characteristics with nacelle mounted LiDAR systems
Measuring dynamic wake characteristics with nacelle mounted LiDAR systems Open
Light Detection And Ranging (LiDAR) systems have gained a great importance in today's wake characteristic measurements. The aim of this measurement campaign is to track the wake meandering and in a further step to validate the wind speed d…
View article: Piezoelectric Patch Transducers: Can alternative sensors enhance bearing failure prediction?
Piezoelectric Patch Transducers: Can alternative sensors enhance bearing failure prediction? Open
This paper examines the applicability of piezoelectric patch transducers as condition monitoring sensors for the drive train of wind turbines. Three laboratory experiments are conducted to determine the sensor’s temperature stability, sens…
View article: Validation of wind turbine wake models with focus on the dynamic wake meandering model
Validation of wind turbine wake models with focus on the dynamic wake meandering model Open
This analysis compares current wake models, such as the Sten Frandsen turbulence model, an engineering wind speed deficit and turbulence model developed by G. Chr. Larsen, the N. O. Jensen wind speed deficit description and three variation…
View article: Validation of turbulence models through SCADA data
Validation of turbulence models through SCADA data Open
This analysis compares engineering turbulence models to SCADA measurements from operating wind farms. The investigated models are S. Frandsen, G.C. Larsen and D.C. Quarton, which all overestimate the wake added turbulence intensity. The mo…
View article: Yawing characteristics during slippage of the nacelle of a multi MW wind turbine
Yawing characteristics during slippage of the nacelle of a multi MW wind turbine Open
High aerodynamic yaw loads coupled with electrical failures in the wind turbine can result to a slippage of the nacelle, due to limited braking capabilities of the yaw system. A slippage on the other hand can lead to a mechanical malfuncti…
View article: Finding the ideal strategy: Full-scale fatigue testing of wind turbine rotor shafts
Finding the ideal strategy: Full-scale fatigue testing of wind turbine rotor shafts Open
For the purpose of a light weight design of rotor shafts, fatigue testing is necessary. Since full-scale fatigue tests of these large components are time consuming, costly and have not been done before, much effort has to be put into the i…
View article: Fatigue life on a full scale test rig: Forged versus cast wind turbine rotor shafts
Fatigue life on a full scale test rig: Forged versus cast wind turbine rotor shafts Open
To reduce uncertainties associated with the fatigue life of the highly safety relevant rotor shaft and also to review today's design practice, the fatigue behaviour will be tested on a full scale test rig. Until now tests on full scale win…
View article: Fatigue and fracture mechanical behaviour of a wind turbine rotor shaft made of cast iron and forged steel
Fatigue and fracture mechanical behaviour of a wind turbine rotor shaft made of cast iron and forged steel Open
To reduce uncertainties associated with the fatigue behaviour of the highly safety relevant wind turbine rotor shaft and also to review today's design practice the fatigue life time is tested on a full scale test rig. Further investigation…
View article: Fretting fatigue induced surface cracks under shrink fitted main bearings in wind turbine rotor shafts
Fretting fatigue induced surface cracks under shrink fitted main bearings in wind turbine rotor shafts Open
This paper deals with the phenomenon of fretting fatigue on the rotor shaft of a wind turbine at the shrink fit of the main bearing. The sensitivity of the rotor shaft for growing cracks that nucleate at the bearing seat is investigated an…