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Energies, Volume 14, Issue 16

August-2 2021 - 501 articles

Cover Story: Commercial two-stage servovalves and direct-drive servovalves are extensively used in industry and aeronautical applications, given the excellent dynamic response of the former and the simplicity of construction of the latter. Despite this, these valves have some drawbacks that are still unresolved, such as the high complexity and internal leakage of pilot stages of two-stage servovalves as well as the large weight of the linear force motors of direct-drive servovalves. The use of piezoelectric actuators can be instrumental in solving these issues, in addition to further improving the dynamic response of these valves. This paper is a comprehensive review of novel servovalve architectures that exploit piezoelectric actuation, showing the potential of some to be used by manufacturers as future high-performance designs. View this paper
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Articles (501)

  • Article
  • Open Access
28 Citations
4,174 Views
26 Pages

Solar-Based DG Allocation Using Harris Hawks Optimization While Considering Practical Aspects

  • Suprava Chakraborty,
  • Sumit Verma,
  • Aprajita Salgotra,
  • Rajvikram Madurai Elavarasan,
  • Devaraj Elangovan and
  • Lucian Mihet-Popa

23 August 2021

The restructuring of power systems and the ever-increasing demand for electricity have given rise to congestion in power networks. The use of distributed generators (DGs) may play a significant role in tackling such issues. DGs may be integrated with...

  • Article
  • Open Access
9 Citations
2,194 Views
13 Pages

Innovative Techniques in Underground Mining for the Prevention of Gas Dynamic Phenomena

  • Martina-Inmaculada Álvarez-Fernández,
  • María-Belén Prendes-Gero,
  • Juan-Carlos Peñas-Espinosa and
  • Celestino González-Nicieza

23 August 2021

In the last decades, rigorous research has been carried out with the end of understanding the gas dynamic phenomenon and although different preventive techniques have been employed, even today there are numerous accidents even with the loss of life....

  • Review
  • Open Access
35 Citations
8,174 Views
26 Pages

Review of Wind Turbine Icing Modelling Approaches

  • Fahed Martini,
  • Leidy Tatiana Contreras Montoya and
  • Adrian Ilinca

23 August 2021

When operating in cold climates, wind turbines are vulnerable to ice accretion. The main impact of icing on wind turbines is the power losses due to geometric deformation of the iced airfoils of the blades. Significant energy losses during the wind f...

  • Article
  • Open Access
25 Citations
4,303 Views
26 Pages

23 August 2021

Urban heat island (UHI) effects significantly impact building energy. Traditional UHI investigation methods are often incapable of providing the high spatial density of observations required to distinguish small-scale temperature differences in the U...

  • Article
  • Open Access
28 Citations
3,093 Views
10 Pages

Risk Management Scenarios for Investment Program Delays in the Polish Power Industry

  • Stanisław Tokarski,
  • Małgorzata Magdziarczyk and
  • Adam Smoliński

23 August 2021

The introduction of the Green Deal in 2019 by the European Commission poses a significant challenge for EU member states whose power generation is based primarily on fossil fuels. In Poland, nearly 80% of the electricity is produced from fossil fuels...

  • Article
  • Open Access
9 Citations
3,266 Views
19 Pages

Experimental Assessment of the Performance and Emissions of a Spark-Ignition Engine Using Waste-Derived Biofuels as Additives

  • Joaquim Costa,
  • Jorge Martins,
  • Tiago Arantes,
  • Margarida Gonçalves,
  • Luis Durão and
  • Francisco P. Brito

23 August 2021

The use of biofuels for spark ignition engines is proposed to diversify fuel sources and reduce fossil fuel consumption, optimize engine performance, and reduce pollutant emissions. Additionally, when these biofuels are produced from low-grade wastes...

  • Article
  • Open Access
3 Citations
2,143 Views
13 Pages

23 August 2021

The flexible excitation system (FES) is a kind of novel excitation system with two channels for damping control. Besides the basic functions of traditional excitation systems, flexible excitation systems can provide reactive power support for the ter...

  • Article
  • Open Access
30 Citations
6,731 Views
14 Pages

23 August 2021

Railway transit forms the backbone of sustainable transportation systems, which are necessary to limit the effects of global warming. In this paper, the authors seek to determine whether there is a statistically significant difference in energy consu...

  • Article
  • Open Access
12 Citations
3,293 Views
14 Pages

23 August 2021

The management of the power transformer population is a complex process, as the grid companies operate thousands of devices. For this issue, the health index method can be applied to facilitate asset management. The algorithm can be used not only in...

  • Article
  • Open Access
11 Citations
2,359 Views
14 Pages

23 August 2021

The quantitative evaluation of cluster wind power output volatility and source-load timing matching is vital to the planning and operation of the future power system dominated by new energy. However, the existing volatility evaluation methods of clus...

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Energies - ISSN 1996-1073