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Articles 1 - 10 of 10
Full-Text Articles in Engineering
Application Of Fuzzy Pid Control Based On Neutral Network On High/Low Temperature Environmental Simulation System, Jingwang Jiang, Yunjie Wu, Mengchen Wu
Application Of Fuzzy Pid Control Based On Neutral Network On High/Low Temperature Environmental Simulation System, Jingwang Jiang, Yunjie Wu, Mengchen Wu
Journal of System Simulation
Abstract: High/Low Temperature Environmental Simulation System is mainly used for the functional deploying test of the giant space deployable antenna and some large-scale structures at extreme high/low temperatures, and some other relevant tests. This project requests controlling the parameters of the system in a large range with high accuracy and no overshoot. Temperature control system has features of non-linearity, time-variant, and large delay, which seriously affect the speed and accuracy of the control. However, the conventional PID finds it difficult to achieve desired effect of control. A new scheme of compound control which is referred to as fuzzy-PID control based …
Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan
Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan
Journal of System Simulation
Abstract: With the aim of improving the performance of the vector controlled induction motor system, a novel control method which combines variable structure PID speed control with online identification of rotor resistance based on model reference adaptive system (MRAS) is proposed. The rotor resistance is identified by self-adaptive adjustment in the model reference adaptive system based on the instantaneous reactive power. Given that the parameters can not change on line and the integral saturation phenomenon often exists in traditional PID speed regulator, a variable structure PID speed controller is designed by integrating anti-windup technology with fuzzy theory based on traditional …
Demand Forecasting Of Wartime Spares Based On Evidence Theory, Yunjing Zhang, Xinxin Wang, Wang Yang, Guangming Tang
Demand Forecasting Of Wartime Spares Based On Evidence Theory, Yunjing Zhang, Xinxin Wang, Wang Yang, Guangming Tang
Journal of System Simulation
Abstract: A new method based on evidence theory is proposed to solve the lack of data for the demand prediction of spares in wartime. Utilizing Markov chain model to research the rule of spares demand of peacetime from the historical data. A Markov chain transfer probability adjustment strategy, based on the change of combat intensity, is designed, which can be used to simulation the rule of spares demand in wartime. Under the experience of experts and the combination of the Fuzzy theory and evidence theory, the spares demand is wartime is forecasted. The simulation example shows that the …
A Hybrid Of Fuzzy Theory And Quadratic Function For Estimating And Refining Transmission Map, Jyun-Yu Jhang, Chengjian Lin, Kuu-Young Young, Chin-Teng Lin
A Hybrid Of Fuzzy Theory And Quadratic Function For Estimating And Refining Transmission Map, Jyun-Yu Jhang, Chengjian Lin, Kuu-Young Young, Chin-Teng Lin
Turkish Journal of Electrical Engineering and Computer Sciences
In photographs captured in outdoor environments, particles in the air cause light attenuation and degrade image quality. This effect is especially obvious in hazy environments. In this study, a fuzzy theory is proposed to estimate the transmission map of a single image. To overcome the problem of oversaturation in dehazed images, a quadratic-function-based method is proposed to refine the transmission map. In addition, the color vector of the atmospheric light is estimated using the top 1\% of the brightest light area. Finally, the dehazed image is reconstructed using the transmission map and the estimated atmospheric light. Experimental results demonstrate that …
Model For Assessing The Functionality Of Soil And Water Conservation Facilities, Nai-Hsin Pan, Kuei-Yen Chen
Model For Assessing The Functionality Of Soil And Water Conservation Facilities, Nai-Hsin Pan, Kuei-Yen Chen
Journal of Marine Science and Technology
Most soil and water conservation facilities are located in remote areas, posing measurement difficulties for precision instruments. Therefore, visual inspection, which is advantageous because of its high speed, is the primary assessment method for such facilities. However, the degree of infrastructural damage subjectively assessed by various inspectors may vary. Therefore, to overcome the problem induced by inspectors’ subjectivity in assessing facilities, this study adopted the concept of fuzzy set theory to establish a soil and water conservation facility assessment model that can define the membership functions of specific semantic ranges. This study applied semantics to infer current facility conditions, which …
An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo
An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo
Journal of Marine Science and Technology
The definition of critical space used in this paper is identical to the critical path definition employed in the critical path method (CPM). This definition implies that there is no extra floating space; thus, any conflict is expected to result in productivity loss. Space syntax is a theory developed to reveal the hidden interrelationships between spaces using architectural diagrams. Existing studies have indicated the potential for space syntax to identify critical spaces and to assist in reducing conflicts leading to productivity loss. However, there is not yet quantitative evidence demonstrating whether the quantitative parameters of relative convenience and relative control …
An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo
An Application Of Space Syntax To Critical Working Space Analysis: The Case Of Building Construction, Li-Wen Wu, Sy-Jye Guo
Journal of Marine Science and Technology
The definition of critical space used in this paper is identical to the critical path definition employed in the critical path method (CPM). This definition implies that there is no extra floating space; thus, any conflict is expected to result in productivity loss. Space syntax is a theory developed to reveal the hidden interrelationships between spaces using architectural diagrams. Existing studies have indicated the potential for space syntax to identify critical spaces and to assist in reducing conflicts leading to productivity loss. However, there is not yet quantitative evidence demonstrating whether the quantitative parameters of relative convenience and relative control …
Fuzzy Statistical Refinement For The Forecasting Of Tenders For Roadway Construction, Jeng-Wen Lin, Cheng-Wu Chen, Ting-Chang Hsu
Fuzzy Statistical Refinement For The Forecasting Of Tenders For Roadway Construction, Jeng-Wen Lin, Cheng-Wu Chen, Ting-Chang Hsu
Journal of Marine Science and Technology
Due to market competition, construction companies often place low bids when tenders are invited for domestic public construction projects. Over-competition can lead to vicious price wars to win a tender, which can in turn seriously affect the quality of construction. This study aims to establish an accurate Taiwan based model for the forecasting of the tendered price for roadway construction. This model is designed to assist the public sector to determine what would be a reasonable reserve price or award price. In order to ensure accurate predictions, a data classification system is established using fuzzy set theory. For each category …
An Integrated Quantitative Risk Analysis Method For Major Construction Accidents Using Fuzzy Concepts And Influence Diagram, Yong-Huang Lin, Chen-Chung Lin, Yaw-Yauan Tyan
An Integrated Quantitative Risk Analysis Method For Major Construction Accidents Using Fuzzy Concepts And Influence Diagram, Yong-Huang Lin, Chen-Chung Lin, Yaw-Yauan Tyan
Journal of Marine Science and Technology
The accident factor identification and risk assessment is an essential requirement for prevention of major construction accidents in the construction project process. An integrated quantitative risk assessment (IQRA) method has been proposed in this paper to overcome the problems of difficult to quantify accident probability for construction industry. The proposed approach employs influence diagram and fuzzy theory to estimate accident probability and to deal with the imprecision inherent to the process of subjective judgment. A case study that evaluates accident probability of diaphragm wall collapse is presented to illustrate the use of this methodology and to demonstrate its capability.
Fuzzy Optimal Swarm Of Autonomous Aircrafts For Target Determination And Convergence Control System, Zach D. Richards
Fuzzy Optimal Swarm Of Autonomous Aircrafts For Target Determination And Convergence Control System, Zach D. Richards
Electronic Theses and Dissertations
The thesis project proposes analytical and theoretical algorithms for a networked swarm of autonomous vehicles, such as those used in planet exploration, and to be used in target location determination and convergence, an algorithm of this type could be used in an Autonomous Stratospheric Aircraft (ASA), thus having the possibility of being used for the exploration of a planet as well as many other applications. Upon locating an unknown location of a specified target, the algorithm would then swarm and eventually converge upon the location. There are two similar, but fundamentally different algorithms proposed in this project. These algorithms are …