Resonance of steel wind turbines: Problems and solutions

Bernuzzi, Claudio; Crespi, Pietro; Montuori, Rosario; Nastri, Elide; Simoncelli, Marco; Stochino, Flavio; Zucca, Marco

doi:10.1016/j.istruc.2021.02.053

Cited by 32 publications

(17 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, without any extra investment, it is possible to utilize damage detection methods, which can be applied to already existing FE models, as a reasonable and cost-efficient approach. Such an approach enables to analyze complicated damage scenarios, which involve simultaneous damage at multiple locations, beforehand [24,25]. Obtained results can be stored in a database and used to monitor the health condition of the structure regularly or after extreme events such as earthquakes or hurricanes.…”

Section: Data Processing and Analysis Methodologymentioning

confidence: 99%

An Innovative Structural Damage Detection System for Preventive Maintenance of Wind Turbines

Ozbek

2022

Arab J Sci Eng

View full text Add to dashboard Cite

This study aims to develop a novel damage detection and preventive maintenance system that can be used for continuous or periodic monitoring of wind turbine components. The main features of the proposed system such as the measurement technique, data analysis procedure, and damage estimation methodology are described in detail by presenting the results of finite element model-based damage simulations, laboratory experiments, and in-field vibration tests. A hybrid measurement system with accelerometers and an automated infrared laser scanner is used to acquire vibration data with high spatial resolution. The obtained response data are then processed to extract the dynamic properties (e.g., natural vibration periods and mode shapes) of the structure. An efficient damage detection algorithm, which is based on monitoring sudden changes observed in mode shapes, is utilized to determine the location and extent of a possible damage. Within the scope of the work, a novel and simplified version of the widely used mode shape curvature method is developed for the rapid analysis and interpretation of the acquired vibration data. The applicability of the proposed methodology is demonstrated on a 61.5 m long numerical blade model proposed for NREL 5 MW Benchmark wind turbine.

show abstract

Section: Data Processing and Analysis Methodologymentioning

confidence: 99%

An Innovative Structural Damage Detection System for Preventive Maintenance of Wind Turbines

Ozbek

2022

Arab J Sci Eng

View full text Add to dashboard Cite

show abstract

“…Articles [1,20,21] mention the importance of estimating eigenfrequencies when the bench is operating. The proposed solutions have general applicability and can be extended to many other different cases.…”

Section: Overview Of Methods Of Loading the Test Benchmentioning

confidence: 99%

Principles of Imitation for the Loading of the Test Bench for Gas Turbines of Gas Pumping Units, Adequate to Real Conditions

et al. 2021

View full text Add to dashboard Cite

The purpose of the study is to analyze the prospects for the development of loading methods for gas turbines as well as to develop a mathematical model that adequately describes the real operating conditions of the loading system at various loads and rotation speeds. A comparative analysis of the most common methods and technical means of loading the shafts of a free turbine at gas turbine plants intended for operation as part of gas pumping units is presented. Based on the results of the analysis, the expediency of using the loading model “Free Power Turbine Rotor–Hydraulic Brake” as a load simulation is shown. Recommendations for the creation of an automation system for the load testing of power plants have been developed. Mathematical models and Hardware-in-the-Loop simulation models of power plants have been developed and tested. One of the most important factors that predetermine the effectiveness of the loading principle is the possibility of software implementation of the loading means using software control systems that provide the specified loading parameters of the gas turbine.

show abstract

“…Moreover, to compare the differences in term of frequencies, parameter D F has been introduced 27 as

D_{F} goodbreak= (||, \frac{f_{italicFEM} - f_{italicexp}}{f_{FEM}}) \cdot 100 ([] %)

where f FEM is the frequency value obtained from finite element model and f exp is the one experimentally observed. The lower is D F and the better is the agreement between the compared frequencies.…”

Section: The Experimental Programmementioning

confidence: 99%

Modal identification of storage racks for cheese wheels

Bernuzzi

Rottenbacher

Simoncelli

et al. 2022

Structural Contr & Hlth

Self Cite

View full text Add to dashboard Cite

During the Emilia-Romagna earthquake (2012), a great number of steel racks used to store cheese wheels collapsed, causing a non-negligible damage to the Italian economy. Therefore, for similar structures that survived and are in service, a deep investigation towards the assessment of their effective safety is required.In the seismic analysis of these frames, the mechanical constraint acting onto the racks due to the reinforced concrete sidewalls, possible nonlinearities exhibited by the base-plate joints and the in-plane restraint provided by wooden boards that connects adjacent columns should be carefully modelled to ensure realistic design results.In the paper, an experimental activity, based on suitable modal identification techniques, is presented to capture the dynamic behaviour of these peculiar structures. The scope is to collect data useful to calibrate numerical finite element models in order to accurately define the aforementioned unknown parameters. Furthermore, a few numerical models based on ideal restraints are herein discussed stressing out non-negligible differences in terms of expected seismic and static response.

show abstract

Resonance of steel wind turbines: Problems and solutions

Cited by 32 publications

References 23 publications

An Innovative Structural Damage Detection System for Preventive Maintenance of Wind Turbines

An Innovative Structural Damage Detection System for Preventive Maintenance of Wind Turbines

Principles of Imitation for the Loading of the Test Bench for Gas Turbines of Gas Pumping Units, Adequate to Real Conditions

Modal identification of storage racks for cheese wheels

Contact Info

Product

Resources

About