Search results for "tower"

Marketing Science and the Ivory Tower

1994

How much has quantitative “marketing science” contributed to the practice of marketing? In my view, not much. In this article, based on extensive consulting experience, it is argued that well-established quantitative techniques like econometric models and diffusion models have produced little of either practical or scientific value. Other quantitative techniques, such as conjoint analysis, have been more useful for marketing decision-makers. But what is needed is a more pluralistic culture, drawing on a range of complementary disciplines.

Semiactive vibration control of offshore wind turbine towers with tuned liquid column dampers using H<inf>∞</inf> output feedb…

2010

This short paper addresses the problem of vibration in wind turbine towers. These structures are subject to winds and waves causing undesirable vibrations that affect the structure integrity and system performance. In order to mitigate the vibrations of the tower, a controllable tuned liquid column damper is placed on its top. We propose the use of H ∞ control techniques to formulate a control law. Furthermore, the controller uses output feedback to avoid the dependence on the knowledge of the states of the system. Simulation results illustrate the design procedure proposed in this paper.

Weather sensor fault detection in meteorological masts

2020

Wind power has become the world’s fastest growing renewable technology. The world-wide wind power installed capacity has exceeded 597 GW, and the new installations during the last three years was an average of 50 GW per year. A major issue with wind power system and with meteorological masts is the relatively high cost of operation and maintenance (OM). Wind turbines and sensor towers are hard-to-access structures, and they are often located in remote areas. That’s why continuous monitoring of wind turbine health using automated failure detection algorithms can improve turbine reliability and reduce maintenance costs by detecting failures before they reach a catastrophic stage and by elimin…

Buckling strength of steel tube for lifting telescopic wind steel tower

2021

Abstract A telescopic pole for wind energy production with low environmental impact and its lifting system for a 60–250 kW turbine and a height of 30 m have been designed and manufactured. The tower, was raised and lowered by automation or by remote control, that allows one to differentiate the presence of the generator within the landscape over time. The jacking systems acting on the legs had a combination of holes (on the legs) and pegs actuated by hydraulic pistons. The aim of the paper was the experimental and the analytical verification of the stability condition of the steel piston as a lifting system of the prototype. An experimental investigation was carried out on small-scale speci…

The passive cooling system from tradition to innovation: wind Towers

2012

The work presented by Golnaz Ighany, tutored by Maria Luisa Germanà, is a scheme that shows a synthesis of her PhD Research concluded in March 2011. The aim of the research was exploring the potential of using passive cooling systems and natural ventilation with special attention on wind towers. The study was focused on traditional passive cooling strategies which had been used in Middle East and Mediterranean areas. More particularly, the most common types of wind towers were analyzed in relation to different aspects: from the typology analysis to the dimensional one, from materials to systems and construction processes, from “live welfare” to energy efficiency. In parallel, it was conduct…

Comparison of sensible and latent heat fluxes computed by a surface energy balance algorithm and measured eddy covariance fluxes across rainfall even…

2009

Flexural Test on a Full-Scale 60-kW Wind Turbine-Tower Telescopic Steel Pipe

2019

A full-scale static test to failure was conducted on 6-m (236.22 in.)-long steel pipes constituting a segment of a telescopic wind tower with a 60-kW wind turbine. The diameter of the circular cross section of the steel pipes was 900 mm (35.43 in.), and the nominal thickness was 10 mm (0.39 in.). The steel grade was 355 MPa (51,488 psi). The tests were conducted in a force-controlled mode in a four-point bending test with a shear-to-span ratio of 2.05. The flexural limit states developed in the form of ovalization of the cross section and of local buckling. The buckling occurred in the plastic range because of the diameter-to-thickness ratio of the section. Although local buckling caused sl…

PATRIMONIO STORICO SICILIANO: LE TORRI COSTIERE

2016

L’intervento di conservazione e valorizzazione delle torri costiere, che è oggetto di questo contributo, è il risultato di uno studio che mette in primo piano una metodologia di recupero edilizio fondata su una rigorosa analisi del manufatto storico e al contempo di una politica di gestione sostenibile delle risorse culturali e ambientali. Le torri costiere sono emergenze significative del territorio, tracce di pregevole rilievo della cultura difensiva siciliana per valore storico ed ambientale. Le torri hanno ancora un significato intrinseco che non è soltanto di testimonianza storica, bensì dell’essere siti privilegiati del territorio, attraverso i quali poter innescare un circuito di con…

Applicability of a displaced-beam laser scintillometer in a sparse tall Mediterranean vegetation

2009

Recent studies showed that the sensible heat flux (H) measured with an array of eddy-correlation system has an high spatial and temporal variability over sparse tall vegetation, such as olive trees, whereas H determined with a displaced-beam laser scintillometer (DBLS) appeared to behave more stable. In this study, the results are shown of two field experiments performed over an olive tree plantation in Sicily in 2007 and 2008, in order to investigate the applicability of a DBSL in combination with remote sensing techniques for the actual evapotranspiration assessment. In 2007 the laser beams was closer to the top of the canopy than in 2008. Various aspects of the scintillation method will …

AR to Rediscover Heritage: the Case Study of Salerno Defense System

2022

Recognizing and transmitting the uniqueness and identity of one’s territory represents fundamental step to guarantee its sustainability, protection and valorisation. Of particular importance, moreover, is the issues of the lesser-known heritage of great value but which, unfortunately, in some cases is still little known and often in a state of neglect. However, the diffusion of new technology and the great development of digitization positively contribute to the accessibility and visibility of these patrimonies, increasing the knowledge and the dissemination. This contribution focuses on one of the towers of the coastal defence system, a perfect example of a lesser-known architecture of gre…