scholarly journals Recent Advances in Vibration Control Methods for Wind Turbine Towers

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7536
Author(s):  
Georgios Malliotakis ◽  
Panagiotis Alevras ◽  
Charalampos Baniotopoulos
Keyword(s):  
Vibration Control ◽  
Wind Turbine ◽  
Structural Reliability ◽  
State Of The Art ◽  
Wind Waves ◽  
Control Methods ◽  
Environmental Loads ◽  
Recent Advances ◽  
Wind Turbine Towers ◽  
The Impact

Wind power is a substantial resource to assist global efforts on the decarbonization of energy. The drive to increase capacity has led to ever-increasing blade tip heights and lightweight, slender towers. These structures are subject to a variety of environmental loads that give rise to vibrations with potentially catastrophic consequences, making the mitigation of the tower’s structural vibrations an important factor for low maintenance requirements and reduced damage risk. Recent advances in the most important vibration control methods for wind turbine towers are presented in this paper, exploring the impact of the installation environment harshness on the performance of state-of-the-art devices. An overview of the typical structural characteristics of a modern wind turbine tower is followed by a discussion of typical damages and their link to known collapse cases. Furthermore, the vibration properties of towers in harsh multi-hazard environments are presented and the typical design options are discussed. A comprehensive review of the most promising passive, active, and semi-active vibration control methods is conducted, focusing on recent advances around novel concepts and analyses of their performance under multiple environmental loads, including wind, waves, currents, and seismic excitations. The review highlights the benefits of installing structural systems in reducing the vibrational load of towers and therefore increasing their structural reliability and resilience to extreme events. It is also found that the stochastic nature of the typical tower loads remains a key issue for the design and the performance of the state-of-the-art vibration control methods.

610 Vibration Control of Wind Turbine Towers Using Tuned Liquid Dampers

2011 ◽  
Vol 2011.49 (0) ◽  
pp. 149-150
Author(s):  
Takashi IKEDA ◽  
Hisashi TAKAHASHI ◽  
Yuji HARATA ◽  
Yukio ISHIDA
Keyword(s):  
Vibration Control ◽  
Wind Turbine ◽  
Tuned Liquid Dampers ◽  
Wind Turbine Towers ◽  
Liquid Dampers

scholarly journals Reconstructing Stress Resultants in Wind Turbine Towers Based on Strain Measurements

2021 ◽  
pp. 224-235
Author(s):  
Marko Kinne ◽  
Ronald Schneider ◽  
Sebastian Thöns
Keyword(s):  
Wind Turbine ◽  
Wind Waves ◽  
Support Structures ◽  
Strain Measurements ◽  
Cyclic Stresses ◽  
Waves And Currents ◽  
Wind Turbine Towers ◽  
The Individual ◽  
Cyclic Demand ◽  
Dynamic Phenomena

AbstractSupport structures of offshore wind turbines are subject to cyclic stresses generated by different time-variant random loadings such as wind, waves, and currents in combination with the excitation by the rotor. In the design phase, the cyclic demand on wind turbine support structure is calculated and forecasted with semi or fully probabilistic engineering models. In some cases, additional cyclic stresses may be induced by construction deviations, unbalanced rotor masses and structural dynamic phenomena such as, for example, the Sommerfeld effect. Both, the significant uncertainties in the design and a validation of absence of unforeseen adverse dynamic phenomena necessitate the employment of measurement systems on the support structures. The quality of the measurements of the cyclic demand on the support structures depends on (a) the precision of the measurement system consisting of sensors, amplifier and data normalization and (b) algorithms for analyzing and converting data to structural health information. This paper presents the probabilistic modelling and analysis of uncertainties in strain measurements performed for the purposes of reconstructing stress resultants in wind turbine towers. It is shown how the uncertainties in the strain measurements affect the uncertainty in the individual components of the reconstructed forces and moments. The analysis identifies the components of the vector of stress resultants that can be reconstructed with sufficient precision.

605 Vibration Control of Wind-Turbine Towers by Dynamic Absorbers

2012 ◽  
Vol 2012.50 (0) ◽  
pp. 60501-60502 ◽  
Author(s):  
Takashi IKEDA ◽  
Yuji HARATA ◽  
Jun SUMIDA ◽  
Yukio ISHIDA
Keyword(s):  
Vibration Control ◽  
Wind Turbine ◽  
Wind Turbine Towers

Dynamic Analysis and Evaluation of Wind Turbine Towers

2012 ◽  
Vol 193-194 ◽  
pp. 639-642 ◽  
Author(s):  
Chang Zheng Chen ◽  
Ping Ping Pan ◽  
Shi Wei Zhang ◽  
Meng Qiang
Keyword(s):  
Dynamic Analysis ◽  
Wind Turbine ◽  
Static Analysis ◽  
Dynamic Effect ◽  
Coupling Theory ◽  
Analysis And Evaluation ◽  
Static And Dynamic Analysis ◽  
Wind Turbine Towers ◽  
Fluid Coupling ◽  
The Impact

This paper presents static and dynamic analysis of wind turbine towers which is supporting a 1.5MW wind turbine based on the theory of FEM. In static analysis, the modal frequencies of the towers are analyzed without wind load. In dynamic analysis, by the fluid-coupling theory, the dynamic effect of wind loads on the towers is calculated. It can be concluded that the main errors under the different load situations is caused by the impact of fluid structure coupling.

scholarly journals Uncertainty Quantification for Fatigue Life of Offshore Wind Turbine Structure

2021 ◽  
Author(s):  
Abraham Nispel ◽  
Stephen Ekwaro-Osire ◽  
Joao Paulo Dias ◽  
Americo Cunha
Keyword(s):  
Fatigue Life ◽  
Wind Turbine ◽  
Uncertainty Quantification ◽  
Structural Reliability ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Loading Conditions ◽  
Model Input ◽  
Input Parameters ◽  
The Impact

Abstract This study aims to address the question: can the structural reliability of an offshore wind turbine (OWT) under fatigue loading conditions be predicted more consistently? To respond to that question this study addresses the following specific aims: (1) to obtain a systematic approach that takes into consideration the amount of information available for the uncertainty modeling of the model input parameters, and (2) to determine the impact of the most sensitive input parameters on the structural reliability of the OWT through a surrogate model. First, a coupled model to determine the fatigue life of the support structure considering the soil-structure interaction under 15 different loading conditions was developed. Second, a sensitivity scheme using two global analyses was developed to consistently establish the most and least important input parameters of the model. Third, a systematic uncertainty quantification (UQ) scheme was employed to model the uncertainties of model input parameters based on their available-data-driven and physics-informed-information. Finally, the impact of the proposed UQ framework on the OWT structural reliability was evaluated through the estimation of the probability of failure of the structure based on the fatigue limit state design criterion. The results show high sensitivity for the wind speed and moderate sensitivity for parameters usually considered as deterministic values in design standards. Additionally, it is shown that applying systematic UQ not only produces a more efficient and better approximation of the fatigue life under uncertainty, but also a more accurate estimation of the structural reliability of offshore wind turbine's structure during conceptual design. Consequently, more reliable, and robust estimations of the structural designs for large offshore wind turbines with limited information may be achieved during the early stages of design.

scholarly journals VIBRATION CONTROL OF WIND TURBINE TOWERS WITH KDAMPER-BASED DESIGNS

2021 ◽  
Author(s):  
Konstantinos Kapasakalis ◽  
Ioannis Antoniadis ◽  
Evangelos Sapountzakis
Keyword(s):  
Vibration Control ◽  
Wind Turbine ◽  
Wind Turbine Towers

State-of-The-Art Cooling and Lubrication for Machining Inconel 718

2020 ◽  
Vol 143 (5) ◽  
Author(s):  
Andrea De Bartolomeis ◽  
Stephen T. Newman ◽  
Dirk Biermann ◽  
Alborz Shokrani
Keyword(s):  
Tool Wear ◽  
Surface Integrity ◽  
Inconel 718 ◽  
State Of The Art ◽  
Chemical Properties ◽  
Surface Topology ◽  
Machine Material ◽  
Recent Advances ◽  
The Impact ◽  
Cooling And Lubrication

Abstract Inconel 718 is the most used nickel superalloys with applications in aerospace, oil and gas, nuclear, and chemical industries. It is mostly used for safety-critical components where the condition of the surface is a significant concern. The combination of mechanical, thermal, and chemical properties of Inconel 718 has made it a difficult-to-machine material. Despite recent advances in machining Inconel 718, achieving desired surface integrity with prescribed properties is still not possible. Different machining environments have been investigated for improving the machinability of Inconel 718 and enhance the surface integrity of machined components. This paper provides a new investigation and classification into recent advances in the machining of Inconel 718 regarding surface integrity, mostly concentrated on turning applications. The major findings and conclusions provide a critique of the state-of-the-art in machining environments for Inconel 718 together with future directions for research. Surface integrity has been evaluated in terms of surface topology as well as mechanical and microstructural properties. The impact of various cooling and lubrication methods has been investigated. It has been found that surface integrity is affected by the thermomechanical conditions at the cutting zone which are influenced by the cutting parameters, cutting tool, tool wear, and cooling/lubrication condition. The current technologies are incapable of delivering both productivity and sustainability while meeting surface integrity requirements for machining Inconel 718. High-pressure cooling has shown the potential to enhance tool wear at the expense of higher power consumption.

Sign in / Sign up

Export Citation Format

Share Document