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Jessica G. Holierhoek

Jessica G. Holierhoek
JEHO BV

PhD MSc

About

24
Publications
4,993
Reads
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307
Citations
Introduction
With 20 years of experience in wind turbine aeroelasticity, I provide services to the industry if they have difficulties with solving vibrations on the turbine: www.jeho.nl . I also provide courses to professionals and PhD students and one day a week work for Delft University of Technology, for the wind energy group. If you have any questions concerning instabilities or resonances on WT's, please let me know!
Additional affiliations
January 2016 - September 2019
Delft University of Technology
Position
  • teacher
Description
  • part time teacher: wind turbine aeroelasticity & guiding master thesis students
October 2015 - present
JEHO BV
Position
  • Managing Director
Description
  • Working as consultant in the area of wind turbine aeroelasticity, solving instabilties, providing courses, doing load calculations etc.
August 2007 - September 2015
ECN part of TNO
Position
  • Wind energy researcher
Description
  • Research, project management and consultancy within the field of wind turbine aeroelasticity.

Publications

Publications (24)
Presentation
Full-text available
At JEHO BV we provide different training options in the field of wind turbine aeroelasticity. Seel also our website: www.jeho.nl/service.html
Presentation
Full-text available
We provide a three day course in which you will learn everything about possible aeroelastic instabilities on a wind turbine as well as resonances that should be avoided. Everything will be treated such that you will become familiar with why these issues can occur and how they can be avoided. An extensive description of the course can be found in th...
Article
Full-text available
Over the years it has become clear that renewable energy is an absolute necessity and wind energy is one alternative source of energy that can replace part of the non-renewable energy generation. Generating the energy from the wind by slowing the wind down must however still be further developed before it becomes economically viable. As the wind ve...
Chapter
Aeroelasticity concerns the interaction between aerodynamics, dynamics and elasticity. This interaction can result in negatively or badly damped wind turbine blade modes, which can have a significant effect on the turbine lifetime. The first aeroelastic problem that occurred on commercial wind turbines concerned a negatively damped edgewise mode. I...
Chapter
In this chapter aeroelastic stability for wind turbines is discussed. The complete wind turbine mode shapes, the harmonic modal components, and the main instabilities are explained, possible resonances addressed, and methods to analyze and improve the stability of a wind turbine design are discussed. The main instabilities that current size wind tu...
Article
This paper studies the use of blade tip sensors for load reductions and blade-tower clearance control. Typically, modern blade tip sensors measure flapwise tip deflection distances at a high sampling rate, and such measurements can be utilised as feedback signals for control operations. Thus, this paper proposes a novel blade pitch control design b...
Presentation
Full-text available
This gives you a very short overview concerning classical flutter for wind turbines
Presentation
Full-text available
Why is the frequency of a mode on a complete turbine sometimes at a different frequency when you measure it on the tower (stand still frame, but for rotating wind turbine) compared to on the blade root? This mini lecture provides an explanation.
Article
In this paper we report the results of a workshop organised by the Delft University of Technology in 2014, aiming at the comparison between different state-of-the-art numerical models for the simulation of wind turbine wakes. The chosen benchmark case is a wind tunnel measurement, where stereoscopic Particle Image Velocimetry was employed to obtain...
Article
To study wind farm aerodynamics (WFA), the Wind Power industry currently relies on simple Engineering Models (EM) that simulate wind farms using basic principles of physics and empirically established approximations. EMs are fast and accurate for an overview of WFA and gauging mean power production, but cannot resolve phenomena like wake meandering...
Article
ABSTRACTPROcedures for TESTing (PROTEST) and measuring wind energy systems) was a pre‐normative project that ran from 2008 to 2010 in order to improve the reliability of mechanical components of wind turbines. Initiating the project, it was concluded that the procedures concerning these components should be further improved. Within the PROTEST proj...
Article
Aeroelastic instabilities can be disastrous for wind turbines. In the early years of wind turbines, aeroelasticity was not a problem, but once wind turbines became larger than 500 kW, some turbines experienced problems due to aeroelastic instabilities. Therefore it is important to design wind turbines with full knowledge of possible aeroelastic ins...
Article
The dynamic stall phenomenon and its importance for load calculations and aeroelastic simulations is well known. Different models exist to model the effect of dynamic stall; however, a systematic comparison is still lacking. To investigate if one is performing better than another, three models are used to simulate the Ohio State University measurem...
Article
The reliability of mechanical components of wind turbines needs to be improved. In the PROTEST project, a pre-normative project, complementary procedures are developed to improve the specification of the design loads at the interfaces where the mechanical components (pitch and yaw system as well as the drive train) are attached to the wind turbine....
Article
Full-text available
Two different instabilities that might occur in wind turbines are discussed: flap-lag-stall and negative damping of the edgewise mode. The conditions in which these instabilities can come about has been investigated. It can be concluded that the flap-lag-stall instability is not likely to happen. The negative damping of the edgewise mode however, i...
Conference Paper
Large wind turbines sometimes suffer from aeroelastic problems, therefore investigating the stability is important. The modeling method used is the first step to be taken in the aeroelastic analysis. Two aspects are looked at in this paper, the stiffness of the springs and the structural pitch. Simulations are run using a fully nonlinear aeroelasti...
Article
In the STAB CON project both passive and active instability suppression of Pitch Regulated Variable Speed (PRVS) and Active-Stall Regulated (ASR) wind turbines have been investigated. The first part of the project concerning passive stability of wind turbines with no active control has lead to a common understanding of turbine instabilities, develo...
Article
One of the instabilities large wind turbines can suffer from is the so-called flap-lag-stall instability. This is caused by the first flap and lead-lag frequencies of the large blade coming closer together as an effect from scaling, combined with the effect of stall. Another instability that can occur in wind turbines operating in or close to stall...

Projects

Projects (2)
Archived project
Archived project