scholarly journals Selection of Wind Turbine Based on Fuzzy Analytic Network Process: A Case Study in China

2021 ◽  
Vol 13 (4) ◽  
pp. 1792
Author(s):  
Nansheng Pang ◽  
Mengfan Nan ◽  
Qichen Meng ◽  
Siyang Zhao
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Evaluation System ◽  
Comprehensive Evaluation ◽  
Analytic Network Process ◽  
Indicator System ◽  
Triangular Fuzzy Number ◽  
Direct Drive ◽  
Network Process

Wind turbine selection is an evaluation problem involving many factors, such as technology, economy, society, etc., and there exist internal dependencies and circular relationships among these factors. This increases the complexity of the selection problem. At the same time, with the development of wind power technology, the types of wind turbines on the market are increasing. Therefore, it is necessary to establish a scientific and comprehensive evaluation system to guide the selection work. This paper extends the traditional indicator system, selecting a total of twelve evaluation indicators from three aspects: operation reliability, economy, and supplier cooperation. The selected indicators are defined in detail to clarify the relationship between them. Then the triangular fuzzy number is introduced to accurately reflect the preference information obtained from experts, and a fuzzy analytical network process (FANP) model for wind turbine unit selection is constructed by combining fuzzy preference programming (FPP) with analytic network process (ANP). In the end, a case study in China is carried out. Results show that the 2.5 W unit produced by Goldwind obtains the best comprehensive evaluation value, which is consistent with the expanding market share permanent magnet direct-drive wind turbines. This paper could provide references for future wind turbine selection questions.

scholarly journals Assessing the Factors Impacting on the Reliability of Wind Turbines via Survival Analysis—A Case Study

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3034 ◽  
Author(s):  
Samet Ozturk ◽  
Vasilis Fthenakis ◽  
Stefan Faulstich
Keyword(s):  
Survival Analysis ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Direct Drive ◽  
Maintenance Costs ◽  
Electrical Systems ◽  
Geographical Factors ◽  
History Of ◽  
Risk Rate

The failure of wind turbines is a multi-faceted problem and its monetary impact is often unpredictable. In this study, we present a novel application of survival analysis on wind turbine reliability, including accounting for previous failures and the history of scheduled maintenance. We investigated the operational, climatic and geographical factors that affect wind turbine failure and modeled the risk rate of wind turbine failure based on data from 109 turbines in Germany operating for a period of 19 years. Our analysis showed that adequately scheduled maintenance can increase the survival of wind turbine systems and electric subsystems up to 2.8 and 3.8 times, respectively, compared to the systems without scheduled maintenance. Geared-drive wind turbines and their electrical systems were observed to have 1.2- and 1.4- times higher survival, respectively, compared to direct-drive turbines and their electrical systems. It was also found that the survival of frequently-failing wind turbine components, such as switches, was worse in geared-drive than in direct-drive wind turbines. We show that survival analysis is a useful tool to guide the reduction of the operating and maintenance costs of wind turbines.

scholarly journals Assessing Factors Impacting on Reliability of Wind Turbines by Use of Survival Analysis – A Case Study

2018 ◽  
Author(s):  
Samet Ozturk ◽  
Vasilis Fthenakis ◽  
Stefan Faulstich
Keyword(s):  
Survival Analysis ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Direct Drive ◽  
Maintenance Costs ◽  
Electrical Systems ◽  
History Of ◽  
Risk Rate ◽  
Reliability Performance

Failure of wind turbines is a multi-faceted problem and its monetary impact is often unpredicted. In this study, we present a novel application of survival analysis on wind turbine reliability performance that includes accounting of previous failures and history of scheduled maintenance. We investigate the operational, climatic and geographical factors which affect wind turbine failures and model the risk rate of wind turbine failures based on data from 109 turbines in Germany operating during a period of 19 years.  Our analysis showed that adequately scheduled maintenance can increase the survivorship of wind turbine systems and electric subsystems up to 2.8 and 3.8 times, respectively compared to the ones without scheduled maintenance. Geared-drive wind turbines and their electrical systems were observed to have 1.2- and 1.4-times higher survivorship, respectively, compared to direct-drive turbines and their electrical systems. It is also found that survivorship of frequently-failed wind turbine components, such as switches, is worse in geared-drive than in direct-drive wind turbines. We show that survival analysis is a useful tool for guiding the reduction of operating and maintenance costs of wind turbines.

The Research of Evaluation for Product Conceptual Design Based on ANP and Fuzzy Theory

2011 ◽  
Vol 311-313 ◽  
pp. 2174-2181 ◽  
Author(s):  
Ping Yuan ◽  
Mei Wang
Keyword(s):  
Conceptual Design ◽  
Evaluation System ◽  
Choquet Integral ◽  
Fuzzy Theory ◽  
Analytic Network Process ◽  
Index Formula ◽  
Evaluation Indexes ◽  
Fuzzy Measures ◽  
Network Process

A approach based on Analytic Network Process (ANP) and fuzzy theory is proposed in order to improve the evaluation system, which is comprised of correlative indexes, of product conceptual design schemes, as well as to select the best scheme and guide the continuous improvement of it. With the application of the concept of fuzzy measure, a new algorithm with ANP is introduced to replace Shapley algorithm to get the fuzzy measures. The interaction values among arbitrary number of evaluation indexes are calculated by plugging the fuzzy measures into the interaction index formula, which is deduced from Shapley value formula and fuzzy reasoning. Then according to the interaction values, the best scheme selected by calculating Choquet integral is improved further. Finally a case study of aged mobile phone design evaluation is conducted to demonstrate the application of this method.

Aesthetic Evaluation of Furniture Design Based on ANP Method

2014 ◽  
Vol 574 ◽  
pp. 318-323 ◽  
Author(s):  
Ming Chen ◽  
Jian Hua Lyu
Keyword(s):  
Product Design ◽  
Evaluation System ◽  
Analytic Network Process ◽  
Furniture Industry ◽  
Furniture Design ◽  
Aesthetic Evaluation ◽  
Scheme Optimization ◽  
Network Process ◽  
Questionnaire Method

With the increasing growth of furniture industry, it has led to much attention on scheme optimization and selection. An approach based on Analytic Network Process (ANP) is proposed in order to improve the evaluation system of furniture design, which is comprised of aesthetic indexes of product design schemes, as well as to select the best scheme and guide the improvement of the best scheme in case study. ANP method is used to obtain the optimal weight performance of the correlative indexes by using SuperDecisions software program, after establishing aesthetic index system by Expert Questionnaire Method. The final result of index weights shows form, color, and ergonomically designed are the most important indexes, which are 0.286559, 0.185002, and 0.132272, respectively.

scholarly journals Enhancing Urban Resilience Capacities: An Analytic Network Process-based Application

2021 ◽  
Vol 25 (1) ◽  
pp. 1270-1283
Author(s):  
Giulia Datola ◽  
Marta Bottero ◽  
Elena de Angelis
Keyword(s):  
Adaptive Systems ◽  
Comprehensive Evaluation ◽  
Multicriteria Analysis ◽  
Analytic Network Process ◽  
Urban Systems ◽  
Urban Resilience ◽  
Evaluation Approach ◽  
Network Process ◽  
Resilience Indicators

Abstract The current urban challenge is enhancing, maintaining and improving the urban resilience of cities. However, how can cities as complex and adaptive systems be or become resilient? There are specific capacities/qualities that urban systems should have to enhance and maintain their resilience (e.g. redundancy, resourceful, robustness, etc.). Different studies list and describe these capacities in literature, underling also to which urban dimension (e.g. economy, society) they are referred. However, there is a lack of quantitative assessment of these capacities. As well, the analysis of which degree different urban components can enhance and maintain these capacities. Based on the socio-ecological approach of urban resilience, this study proposes the application of multicriteria analysis (MCA) to evaluate which degree the different urban components can support the enhancement and the maintenance of the specific urban resilience capacities. The proposed framework is an indicators-based method that includes a multidimensional set of urban resilience indicators and the set of urban resilience capacities. In detail, the Analytic Network Process (ANP) has been selected according to its ability to consider the mutual interconnections of the evaluation elements. Moreover, a multidisciplinary panel of experts is asked to weigh the importance of the different urban components in enriching the different urban resilience qualities. The final result is a set of priorities that assess the relative importance of each urban component about a specific urban resilience capacity. The illustrated application is a preliminary pilot case study that quantifies the possibility of quantitatively assessing the urban resilience capacities. In detail, this application refers to a more complex and comprehensive evaluation approach that combines MCA with the System Dynamics Approach (SDM). Therefore, the next step of this research will concern the aggregation and the employment of the obtained priorities in the abovementioned approach to correlate the urban resilience performance with the urban capacities.

scholarly journals Impact of Typhoons on Floating Offshore Wind Turbines: A Case Study of Typhoon Mangkhut

2021 ◽  
Vol 9 (5) ◽  
pp. 543
Author(s):  
Jiawen Li ◽  
Jingyu Bian ◽  
Yuxiang Ma ◽  
Yichen Jiang
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Safety Evaluation ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Motion Response ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines ◽  
Coupling Motion

A typhoon is a restrictive factor in the development of floating wind power in China. However, the influences of multistage typhoon wind and waves on offshore wind turbines have not yet been studied. Based on Typhoon Mangkhut, in this study, the characteristics of the motion response and structural loads of an offshore wind turbine are investigated during the travel process. For this purpose, a framework is established and verified for investigating the typhoon-induced effects of offshore wind turbines, including a multistage typhoon wave field and a coupled dynamic model of offshore wind turbines. On this basis, the motion response and structural loads of different stages are calculated and analyzed systematically. The results show that the maximum response does not exactly correspond to the maximum wave or wind stage. Considering only the maximum wave height or wind speed may underestimate the motion response during the traveling process of the typhoon, which has problems in guiding the anti-typhoon design of offshore wind turbines. In addition, the coupling motion between the floating foundation and turbine should be considered in the safety evaluation of the floating offshore wind turbine under typhoon conditions.

scholarly journals EVALUASI SEKOLAH SATU ATAP TERPADU DENGAN MENGGUNAKAN ANALISIS SWOT-ANALYTIC NETWORK PROCESS (STUDI KASUS DI KABUPATEN PURWAKARTA)

2019 ◽  
pp. 271
Author(s):  
Abi Revyansah Perwira ◽  
Bayu Kharisma
Keyword(s):  
Junior High School ◽  
Swot Analysis ◽  
Analytic Network Process ◽  
School Level ◽  
High School Level ◽  
Delegation Of Authority ◽  
Network Process ◽  
One Stop ◽  
Junior High School Level

Abstract: Integrated One-Stop School Evaluation Using Analysis SWOT-Analytic NetworkProcess (Case Study in Purwakarta Regency). One way to reduce dropout rates is through aSekolah Satu Atap Terpadu. One of the regencies in West Java that has organized a SekolahSatu Atap Terpadu as well as the object of this research is Purwakarta regency. By using SWOTAnalyticNetwork Process(ANP)analysis, thisstudyseekstoevaluatewhile providingalternativepolicies for the development of Sekolah Satu Atap Terpadu in Purwakarta regency. The data inthis study were obtained by filling out questionnaires by respondents online through Google Form,where respondents were actors who were directly involved in the implementation of a SekolahSatu Atap Terpadu. From the analysis results obtained Strengths and Threats occupy the highestvalue. Strengths include students could continue their education up to junior high school level andlocal government supports both in terms of budget and curriculum. While Threats, among others,school management has become more complex and the delegation of authority from the central andregional governments is not clear. Therefore, the ST strategy can be used as an alternative policyin increasing Strengths and minimizing Threats.Keywords: Sekolah Satu Atap Terpadu; SWOT Analysis; Analytic Network Process (ANP).

scholarly journals The Decision Making Trial and Evaluation Laboratory (Dematel) and Analytic Network Process (ANP) for Safety Management System Evaluation Performance

2018 ◽  
Vol 31 ◽  
pp. 12006 ◽  
Author(s):  
Lisa Rolita ◽  
Bayu Surarso ◽  
Rahmat Gernowo
Keyword(s):  
Decision Making ◽  
Management System ◽  
Evaluation System ◽  
Safety Management ◽  
Analytic Network Process ◽  
Performance Criterion ◽  
Questionnaire Data ◽  
Safety Management System ◽  
International Airport ◽  
Network Process

In order to improve airport safety management system (SMS) performance, an evaluation system is required to improve on current shortcomings and maximize safety. This study suggests the integration of the DEMATEL and ANP methods in decision making processes by analyzing causal relations between the relevant criteria and taking effective analysis-based decision. The DEMATEL method builds on the ANP method in identifying the interdependencies between criteria. The input data consists of questionnaire data obtained online and then stored in an online database. Furthermore, the questionnaire data is processed using DEMATEL and ANP methods to obtain the results of determining the relationship between criteria and criteria that need to be evaluated. The study cases on this evaluation system were Adi Sutjipto International Airport, Yogyakarta (JOG); Ahmad Yani International Airport, Semarang (SRG); and Adi Sumarmo International Airport, Surakarta (SOC). The integration grades SMS performance criterion weights in a descending order as follow: safety and destination policy, safety risk management, healthcare, and safety awareness. Sturges' formula classified the results into nine grades. JOG and SMG airports were in grade 8, while SOG airport was in grade 7.

scholarly journals Study on layout optimization of sewage outfalls: a case study of wastewater treatment plants in Xiamen

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cui Wang ◽  
Zhouhua Guo ◽  
Qingsheng Li ◽  
Jing Fang
Keyword(s):  
Wastewater Treatment ◽  
Water Reuse ◽  
Evaluation System ◽  
Evaluation Method ◽  
Wastewater Treatment Plants ◽  
Comprehensive Evaluation ◽  
Ecological Impact ◽  
Layout Optimization ◽  
Marine Environmental

AbstractIn order to protect the offshore environment and strengthen the comprehensive rectification of sewage outfalls, an evaluation method of regional sewage outfalls by combining the marine numerical simulation and comprehensive evaluation technology was constructed, considering the marine environmental capacity and the ecological impact of sewage discharge from outfalls on the marine eco-environment sensitive areas. Then the layout rationality of each outfall was evaluated and the discharge scale was optimized with a case study of existing sewage outfalls in Xiamen. The results show that, the comprehensive evaluation score of Yundang outfall was 3 points in 2025, evaluated as the outfall with irrational layout. In 2035, the comprehensive evaluation scores of Fenglin and Dalipu outfalls were 3 and 2 points respectively, evaluated as the outfall with irrational discharge scale. It is suggested to control the scale of expansion or increase the reclaimed water reuse rate in Jimei and Gaoqi Wastewater Treatment Plants. This method has enriched the evaluation system for layout optimization of sewage outfalls, providing scientific supports for comprehensive improvement of sewage outfalls and marine environmental management.

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