scholarly journals Toward a Survey-Based Assessment of Wind Turbine Noise: The Impacts on Wellbeing of Local Residents

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5845
Author(s):  
Lida Liao ◽  
Yuliang Ling ◽  
Bin Huang ◽  
Xu Zhou ◽  
Hongbo Luo ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Wind Turbine ◽  
Principal Component ◽  
Well Being ◽  
Key Factors ◽  
Factors Affecting ◽  
Wind Turbine Noise ◽  
Local Residents ◽  
Assessment Results

As a renewable energy source, wind energy harvesting provides a desirable solution to address the environmental concerns associated with energy production to satisfy the increasingly global demand. Over the years, the penetration of wind turbines has experienced a rapid growth, however, the impacts of turbine noise correspondingly become a major concern in wind energy harvesting. Recent studies indicate that the noise emitted by turbine operating could increase the risk of nuisance, which might further affect the well-being of local residents. However, the main factors affecting turbine noise assessment and to what extent they contribute to the assessment are still unclear. In this study, a survey-based approach is developed to identify these major factors and to explore the interactions between the factors and assessment results. Principal component analysis method was adapted to extract key factors; followed by reliability assessment, validity analysis, descriptive assessment, and correlation analysis were conducted to test the robust of the proposed methodology, as well as to examine the interactions between variables. Regression analysis was finally employed to measure the impacts on results contributed by the key factors. Findings of this study indicate that key factors including physical conditions, control capacity, and subjective opinions are of significant impact on residents’ response to wind turbine noise, while the factor of subjective opinions contributes predominately to the assessment results. Further validations also indicate that the proposed approach is robust and can be extensively applied in survey-based assessments for other fields.

Design and performance evaluation of vertical axis wind turbine for wind energy harvesting at railway

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hashwini Lalchand Thadani ◽  
Fadia Dyni Zaaba ◽  
Muhammad Raimi Mohammad Shahrizal ◽  
Arjun Singh Jaj A. Jaspal Singh Jaj ◽  
Yun Ii Go
Keyword(s):  
Wind Speed ◽  
Energy Harvesting ◽  
Wind Energy ◽  
Wind Turbine ◽  
High Speed ◽  
Vertical Axis ◽  
Speed Ratio ◽  
Vertical Axis Wind Turbine ◽  
Modeling Tools ◽  
Content Type

PurposeThis paper aims to design an optimum vertical axis wind turbine (VAWT) and assess its techno-economic performance for wind energy harvesting at high-speed railway in Malaysia.Design/methodology/approachThis project adopted AutoCAD and ANSYS modeling tools to design and optimize the blade of the turbine. The site selected has a railway of 30 km with six stops. The vertical turbines are placed 1 m apart from each other considering the optimum tip speed ratio. The power produced and net present value had been analyzed to evaluate its techno-economic viability.FindingsComputational fluid dynamics (CFD) analysis of National Advisory Committee for Aeronautics (NACA) 0020 blade has been carried out. For a turbine with wind speed of 50 m/s and swept area of 8 m2, the power generated is 245 kW. For eight trains that operate for 19 h/day with an interval of 30 min in nonpeak hours and 15 min in peak hours, total energy generated is 66 MWh/day. The average cost saved by the train stations is RM 16.7 mil/year with battery charging capacity of 12 h/day.Originality/valueWind energy harvesting is not commonly used in Malaysia due to its low wind speed ranging from 1.5 to 4.5 m/s. Conventional wind turbine requires a minimum cut-in wind speed of 11 m/s to overcome the inertia and starts generating power. Hence, this paper proposes an optimum design of VAWT to harvest an unconventional untapped wind sources from railway. The research finding complements the alternate energy harvesting technologies which can serve as reference for countries which experienced similar geographic constraints.

scholarly journals Research on key influence factors of creativity development of applied undergraduates based on PCA

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiangmin Ren ◽  
Jingwei Yu
Keyword(s):  
Principal Component Analysis ◽  
Influence Factors ◽  
Principal Component ◽  
Heilongjiang Province ◽  
Key Factors ◽  
Factors Affecting ◽  
The Core ◽  
Creativity Development ◽  
Teachers And Students ◽  
Core Characteristics

Abstract Creativity is one of the core characteristics of talent; for this reason, the creativity development of applied undergraduates should be one of the basic components of their education. This article gives an overview of the meaning of the creativity of applied undergraduates and makes a literature knowledge-mining and expert investigation on the factors affecting the creativity development. We obtained more than 100 influencing factors, filtered out the duplicative factors, and formed the remaining factors into a questionnaire. A survey was conducted among 1460 teachers and students of some applied undergraduates in Heilongjiang Province. By using principal component analysis (PCA) to analyse the questionnaire, the key factors that affect the creativity development of applied undergraduates are obtained, and the key factors are systematically analysed. According to the results of the analysis, the specific ways and methods of the creativity development of applied undergraduates are put forward.

Key factors affecting long-term penetration of global onshore wind energy integrating top-down and bottom-up approaches

2016 ◽  
Vol 85 ◽  
pp. 19-30 ◽  
Author(s):  
Hancheng Dai ◽  
Diego Silva Herran ◽  
Shinichiro Fujimori ◽  
Toshihiko Masui
Keyword(s):  
Wind Energy ◽  
Key Factors ◽  
Top Down ◽  
Bottom Up ◽  
Onshore Wind ◽  
Factors Affecting

scholarly journals Urban Wind Harvesting Using Flow-Induced Vibrations

2020 ◽  
Vol 16 (4) ◽  
pp. 71-79
Author(s):  
Levon Ghabuzyan ◽  
Christopher Luengas ◽  
Jim Kuo
Keyword(s):  
Wind Tunnel ◽  
Energy Harvesting ◽  
Wind Energy ◽  
Wind Turbine ◽  
Cantilever Beam ◽  
Wind Turbines ◽  
Wind Farms ◽  
Urban Environments ◽  
The Body ◽  
Flow Induced Vibrations

The growing global interest in sustainable energy has paved the way to the rapid development of large-scale wind farms, consisting of dozens to hundreds of wind turbines. Although these large wind farms can generate enormous amount of power, they are also costly and require large areas of land or water, and thus are not suitable for urban environments. Smaller urban wind turbines have been developed for urban environments, but there are significant challenges to their widespread deployment. One of these challenges are their urban wind flows as they are strongly affected by complex building structures, producing highly turbulent flows. Any urban wind turbine would need to be designed to function efficiently and safely under these flow conditions; however, these unpredictable and turbulent winds can induce undesirable vibrations and cause early failures. Recently, bladeless wind turbines are gaining interest due to their reduced costs compared with conventional wind turbines such as the vertical-axis wind turbine and horizontal-axis wind turbine. These bladeless turbines convert flow wind energy into vibration energy, then converts the vibration energy into electricity. This paper examines the effects of force-induced vibrations on a cantilever beam system through wind tunnel experimentation. When fluid flows around a bluff body, periodic shedding of vortices may occur under the right conditions. The vortex shedding process creates an asymmetric pressure distribution on the body which causes the body to oscillate, known as vortex-induced vibrations. The purpose of the paper is to understand the factors affecting flow-induced vibrations and to improve wind energy harvesting from these vibrations. The first part of the paper focuses on wind tunnel experiments, by utilizing a cantilever beam configuration, conceptualized by previous research. Then, the experimental model was tested in different configurations, to determine the best setup for maximizing vibrations induced on the model. The long-term goal of the project was utilizing the model to optimize the system to improve efficiency of wind energy harvesting. The experimental results showed that the presence of an upstream cylinder will significantly improve the amplitude of vibration for energy harvesting, furthermore, the experiments showed that spacing in different directions also affect the amplitude of the vibrations. A two tandem cylinder system was used in this work, including a fixed rigid upstream cylinder and a downstream cylinder supported by a cantilever beam. Various configurations of these two cylinders in terms of spanwise and streamwise separation distances were studied and their maximum and root mean square displacements are reported for different wind speeds. Results showed that the presence of an upstream cylinder will significantly improve the amplitude of vibrations. This work verified that a wind energy harvester needs to consider the effects of wind speed and separation configuration of the cylinders in order to maximize the harvester’s performance in urban environments. KEYWORDS: Sustainable Energy; Energy Harvesting; Urban Environments; Bladeless Wind Turbines; Flow-Induced Vibrations; Cantilever Beam System; Wind Tunnel; Wake

The PCA index for measuring functional diversity and its application to Juglans mandshurica communities in the Beijing mountains, China

2017 ◽  
Vol 10 (07) ◽  
pp. 1750097
Author(s):  
Naiqi Song ◽  
Jin-Tun Zhang ◽  
Fenggu Zhao
Keyword(s):  
Functional Diversity ◽  
Plant Communities ◽  
Environmental Variables ◽  
Principal Component ◽  
Functional Trait ◽  
Effective Index ◽  
Key Factors ◽  
Juglans Mandshurica ◽  
Factors Affecting ◽  
Functional Studies

Methods for measuring functional diversity are essential for functional studies of plant communities. A useful method, the PCA index, based on principal component analysis ordination of functional trait data was introduced and applied to functional diversity analysis of Juglans mandshurica communities in the Beijing Mountains. Thirty-five [Formula: see text] quadrats were established in Juglans mandshurica communities. Species composition, functional traits and environmental factors were measured and recorded. The four common indices, FAD, MFAD, FDp and FDc, were used and compared with the PCA index in the analysis. The results showed that the PCA index was successful in quantifying functional diversity and describing its relationships with environmental variables; therefore, it was an effective index in functional diversity analyses. Functional diversity in Juglans mandshuricacommunities varied widely. Elevation and aspect were the key factors affecting functional diversity in communities. Functional diversity increased with elevation increases and with the change in aspect from North to South. Functional diversity was significantly correlated with species richness and heterogeneity.

scholarly journals Identifying the Factors Affecting Financial Condition of Malaysia

2021 ◽  
Vol 22 (1) ◽  
pp. 403-421
Author(s):  
Yee-Ling Pang ◽  
Hock-Ann Lee
Keyword(s):  
Foreign Exchange Market ◽  
Statistical Significance ◽  
Balance Sheet ◽  
Banking System ◽  
Principal Component ◽  
Well Being ◽  
Factors Affecting ◽  
Financial Condition ◽  
Long Run ◽  
The Us

This research focuses on the domestic and external determinants of Malaysia’s financial condition, ranging from January 2003 and March 2019. To represent the domestic determinants, a total amount of twelve financial indicators are adopted to compute three indices using the Principal Component Approach (PCA). Three of the indices embody three respective financial segments, particularly the banking system, the foreign exchange market, and the capital market within the Malaysian financial system. These three segments offer a glimpse of the Malaysian financial condition. For the external determinant, the US total assets of all Federal Reserve Banks are adopted as the proxy for the size of the US balance sheet. This research intends to evaluate the validity of the long-run association and its corresponding level of effect between the computed indices and the US balance sheet size via the conduct of the ARDL bounds test approach. The research findings have verified the validity of the long-run association between the Malaysian financial condition and the US balance sheet size. There is a substantial role played by the US balance sheet size in affecting the well-being of Malaysian financial condition, given the statistical significance is shown in the association between the US balance sheet size and the financial-segment-based indices, whereby its strongest influence is found on the banking system condition.

IMPACT OF THE COVID-19 PANDEMIC ON INTERNATIONAL MIGRATION IN NORTH AFRICA

2021 ◽  
pp. 54-62
Author(s):  
Juliya S. Kolesnikova ◽  
◽  
Sohib Boudjenah ◽  
◽  
Keyword(s):  
International Migration ◽  
North Africa ◽  
World Economy ◽  
Well Being ◽  
Remote Work ◽  
Key Factors ◽  
Local Residents ◽  
Low Probability ◽  
The Moment

International migration is one of the key factors in the functioning and development of the world economy at the present time. The global COVID-19 pandemic has seriously impacted international migration. In addition to threatening the health of migrants, economic and social shocks threaten the long-term livelihoods and well-being of millions of people. At the moment, many works are devoted to international migration, however, aspects of international migration in North Africa, including in the context of the COVID-19, are poorly researched. This article aims to discuss data on migrants in North Africa with the aim of informing about the possible impact of the COVID-19. The study found that migrants are highly vulnerable to the health impacts of the pandemic from work during the pandemic, as well as vulnerabilities such as housing and poverty. There is a low probability of transferring migrants to remote work, according to international analysts, in most OECD countries the share of immigrants able to work remotely is 5% lower than that of local residents. The risk of infection for migrants is at least twice that of local residents.

Design and Test Campaign of a Ducted Horizontal Axis Wind Turbine

2018 ◽  
Author(s):  
Massimo Rivarolo ◽  
Alessandro Spoladore ◽  
Carlo Cravero ◽  
Alberto Traverso ◽  
Andrea Freda ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Wind Energy ◽  
Wind Turbine ◽  
Energy Production ◽  
Numerical Models ◽  
Electrical Power ◽  
Electrical Energy ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Electrical Energy Production

Electrical energy production by wind energy has assumed more and more relevance in the last years. This paper presents the design of a ducted horizontal axis wind turbine, in order to enhance the performance. The study compares the energy production of a ducted turbine to a traditional free turbine, highlighting the different features. In the first part of the work, different possible geometries have been investigated through a quasi-1D model, using correlations from literature to evaluate pressure, velocity and producible electrical power by the wind turbine. A 3D CFD model, in a set of configurations, has confirmed the preliminary results. The most promising geometries have been selected by combining the outputs of the two models. In order to confirm the results obtained by the numerical models, a test rig has been assembled at the wind tunnel of the Polytechnic School of the University of Genoa. Different possible configurations of the wind energy harvesting system have been tested: free turbine, horizontal duct, convergent duct and convergent-divergent ducts (with the turbine installed in the throat section). In particular, the convergent-divergent duct has shown the best results, with an increase factor close to 2.5 in terms of produced power, compared to the reference free turbine. Finally, the results obtained in the experimental campaign have been used to validate the two models (1D and 3D CFD). Considering the advantages in terms of energy production, this kind of configuration can be considered an interesting solution for many different situations, including energy harvesting.

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