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Articles 31 - 60 of 75
Full-Text Articles in Engineering
Chloride-Binding Isotherms In Concrete Submitted To Non-Steady-State Diffusion-Migration Model, Wen-Hu Tsao, Ming-Te Liang, Ta-Peng Chang
Chloride-Binding Isotherms In Concrete Submitted To Non-Steady-State Diffusion-Migration Model, Wen-Hu Tsao, Ming-Te Liang, Ta-Peng Chang
Journal of Marine Science and Technology
We propose a mathematical non-steady-state, time/depth dependent diffusion-migration model based on the modified Fick’s second law of diffusion. It considers the effects of different chloride binding mechanisms for the transport process of chloride ions diffused in a porous concrete on the variation of its chloride profile. Four different chloride-binding isotherms, i.e., no binding, linear binding, Langmuir binding and Freundlich binding, together with the time/depth dependent chloride diffusivities are investigated. Results of this study show that the variations of amounts of available free chloride ions in the solution of saturated concrete resulting from different chloride-binding isotherms have significant effects on the …
Seismic Response Of An Arch-Beam Interacting With Sequential Moving Train Loads, Jong-Dar Yau, Ladislav Frýba, Shota Urushadze
Seismic Response Of An Arch-Beam Interacting With Sequential Moving Train Loads, Jong-Dar Yau, Ladislav Frýba, Shota Urushadze
Journal of Marine Science and Technology
Considering the axial-flexural coupling nature of an arch bridge subjected to seismic wave, this paper is aimed at investigation of dynamic response for a train moving over a railway arch-bridge shaken by horizontal ground motions. For analytical formulation, the arch bridge is idealized as a flat-rise parabolic arch with constant sectional properties uniformly distributed along the horizontal span and the train moving over it as a sequence of identical sprung mass units with constant intervals. To perform dynamic analysis of vehicle-bridge system shaken by horizontal earthquakes, an incremental-iterative procedure is proposed in this study. From numerical results, the multiple support …
Predictions Of Stress-Strain Curve And Fatigue Life For Aisi 316 Stainless Steel In Cyclic Straining, Liang-Hsiung Chou, Yung-Chuan Chiou, Chia-Chin Wu, Ying- Jen Huang
Predictions Of Stress-Strain Curve And Fatigue Life For Aisi 316 Stainless Steel In Cyclic Straining, Liang-Hsiung Chou, Yung-Chuan Chiou, Chia-Chin Wu, Ying- Jen Huang
Journal of Marine Science and Technology
In this study, experimental observations have been performed to understand the cyclic stress-amplitude response, the cyclic hardening/softening characteristics and the cyclic fatigue properties of AISI 316 stainless steel. Based on the experimental observations, these results are found so that the tested AISI 316 stainless steel possesses cyclic hardening characteristics. The shape of the stable hysteresis loop is symmetrical in tension and compression. The Massing cyclic stress-strain behavior is obviously absent. For the case of the absence of the Massing behavior, the power-law type equation is successfully applied to simulate the shape of the stable hysteresis loop at all applied levels …
Labview-Based Remote Real-Time Evaluation System For Motor Winding Machines, Jia-Sheng Hu, Chien-Chu Yeh, Ke-Han Su, Chao-Jen Chen, Ming-Yang Cheng
Labview-Based Remote Real-Time Evaluation System For Motor Winding Machines, Jia-Sheng Hu, Chien-Chu Yeh, Ke-Han Su, Chao-Jen Chen, Ming-Yang Cheng
Journal of Marine Science and Technology
This paper proposes the design and evaluation methodologies for a remote human-machine interface (HMI) system for motor winding machines. An electric motor with an interior rotor evaluates the system performance. The motor winding machine has a 3 degree-of-freedom motion space controlled by a motion control kernel: IMP-2. Real-time data of the motor winding status is crucial for ensuring quality and reliability and detecting malfunction, which facilitates the development and control of mass production of electric motors. Hence, a realtime monitoring interface is essential. This paper presents a LabVIEW-based HMI, which transfers the winding statuses of a winding machine to remote …
Numerical Simulation Study Of Hydrodynamic Impact Of Sea-Crossing Bridge, Xiao-Feng Guo, Chu-Han Chen, Jun-Jian Tang, Zhou-Hua Guo
Numerical Simulation Study Of Hydrodynamic Impact Of Sea-Crossing Bridge, Xiao-Feng Guo, Chu-Han Chen, Jun-Jian Tang, Zhou-Hua Guo
Journal of Marine Science and Technology
This paper used the Sea-Crossing Bridge in Quanzhou Bay as an example to simulate its tidal flow field after construction by a semi-implicit Lagrangian-Eulerian finite difference method. Triangle or quadrilateral meshes were used to refine a mesh for the sea area close to the bridge in the model. Each bridge pier was treated as land. The minimum side length of the mesh was approximately 5 meters. The simulation results showed that slow flow areas were formed in front of bridge piers due to the influence of rising and falling tides; at the back of bridge piers, slow flow areas were …
Effect Of Lorentz Force On Hydrogen Production In Water Electrolysis Employing Multielectrodes, Ming-Yuan Lin, Wen-Nong Hsu, Lih-Wu Hourng, Teng-Shih Shih, Chien-Ming Hung
Effect Of Lorentz Force On Hydrogen Production In Water Electrolysis Employing Multielectrodes, Ming-Yuan Lin, Wen-Nong Hsu, Lih-Wu Hourng, Teng-Shih Shih, Chien-Ming Hung
Journal of Marine Science and Technology
The aim of this study was to investigate high-efficiency hydrogen production through water electrolysis by using multiple electrodes; the investigated approach can be applied in industry. In this study, three groups of parallel electrodes were used to conduct experiments and research related to water electrolysis parameters. During electrolysis, we introduced Lorentz forces to an electrolytic cell to determine whether the multielectrode mode is identical to the single-electrode mode regarding increases in hydrogen production. The results showed that a multielectrode group instantly increased gas production. In addition, introducing an external upward magnetic field into an electrolytic cell increased gas production at …
A Novel Method For Testing Lcd By Integrating Shorting Bar And Taguchi Doe Technologies, Jium-Ming Lin, Yuan-Jung Chiang
A Novel Method For Testing Lcd By Integrating Shorting Bar And Taguchi Doe Technologies, Jium-Ming Lin, Yuan-Jung Chiang
Journal of Marine Science and Technology
This paper proposes a novel LCD false defect detection method that involves integrating shorting-bar and Taguchi technologies. When both the gate and data lines of an LCD are activated using a shorting bar technique, and an illuminator is applied to the background panel, if all thin-film transistor (TFT) arrays are free of point defect failures, then the lights from the illuminator can penetrate the scanned pixels (i.e., a bright, complete image should appear on the display). Otherwise, there are defects in the TFT cells exhibiting dark patterns. In this study, the P-diagram of the Taguchi design of experiment method was …
Optimization Of Large-Scale Economic Dispatch With Valve-Point Effects Using A Modified Hybrid Pso-Dsm Approach, Chun-Lung Chen, Yu-Liang Lin, Yen-Chang Feng
Optimization Of Large-Scale Economic Dispatch With Valve-Point Effects Using A Modified Hybrid Pso-Dsm Approach, Chun-Lung Chen, Yu-Liang Lin, Yen-Chang Feng
Journal of Marine Science and Technology
This paper proposes a modified hybrid particle swarm optimization (PSO) and the direct search method (DSM) for the solution of large-scale non-convex economic dispatch (NED) problem with valve-point effects. A novel diversity based particle swarm optimization (DPSO) with a fewer iterations required is developed to increase the possibility of generating high quality initial solutions for the DSM. The enhanced direct search method (EDSM) incorporates the parallel nature of evaluation programming into the direct search procedure to enhance its search capacity about global exploration and local optimization using the answer from DPSO as starting points. Many inequality and equality constraints can …
Outsourcing Decisions In Single Machine Scheduling Problem With Multiple External Facilities, Jung Man Hong, Jong Hyup Lee
Outsourcing Decisions In Single Machine Scheduling Problem With Multiple External Facilities, Jung Man Hong, Jong Hyup Lee
Journal of Marine Science and Technology
This paper considers outsourcing decisions in a scheduling problem. The objective of the problem is to minimize the outsourcing costs under the constraints of the capacity of outsourcing facilities and due date of each job. The problem is composed of three kinds of decisions. The first decision is the selection of jobs to be processed in-house, the second is to schedule the in-house processing jobs with due date constraints, and the last is to select an outsourcing provider for each outsourced job where the outsourcing provider has a capacity constraint. Some optimality conditions and solution properties for the problem are …
Applications Of Datum Marker Buoy Data To Search And Rescue Of Persons In Water, Chou-Tien Yao, Chen-Han Tsai, Hsiang-Hang Hsu
Applications Of Datum Marker Buoy Data To Search And Rescue Of Persons In Water, Chou-Tien Yao, Chen-Han Tsai, Hsiang-Hang Hsu
Journal of Marine Science and Technology
The seas around Taiwan have been ranked as posing a moderate risk to ocean-going activities because of heavy ocean traffic and severe weather conditions such as typhoons and monsoons. Taiwan’s Coast Guard responds to approximately 500 calls each year, and over 50% of its search and rescue missions involve persons in water (PIW). The drift of PIW at sea without propulsion is affected by ocean currents, wind, and wave actions. Therefore, having timely, reliable, and accurate environmental information, particularly regarding surface currents, is important to locate a drifting target. We examined the surface current data collected by Taiwan Coast Guard’s …
Investigating Microstructures And High Temperature Superplasticity Behavior Of Mg-5(Mass%) Sn Alloy By Using Equal Channel Angular Extrusion, Hao-Jan Tsai, Chin-Guo Kuo, Chuen-Guang Chao, Tzeng-Feng Liu
Investigating Microstructures And High Temperature Superplasticity Behavior Of Mg-5(Mass%) Sn Alloy By Using Equal Channel Angular Extrusion, Hao-Jan Tsai, Chin-Guo Kuo, Chuen-Guang Chao, Tzeng-Feng Liu
Journal of Marine Science and Technology
In this study, we investigated the microstructures and high temperature plasticity behaviour of an Mg-5(mass%) Sn alloy after equal channel angular extrusion (ECAE). These results show that the grain boundary of the as-cast Mg-5(mass%) Sn alloy contained continuous eutectic ɑ-Mg+Mg2Sn precipitates. After an ECAE process, the average grain size decreased from 147 μm to about 10 μm and the continuous eutectic ɑ-Mg+ Mg2Sn particles were broken down, and those particles distributed uniformly. The maximum elongation was 550 % at high temperature 350C with strain rate of 1x10-3 s-1.
Slope Stability Analysis Of Transient Seepage Under Extreme Climates: Case Study Of Typhoon Nari In 2001, Chia-Feng Hsu, Lien-Kwei Chien
Slope Stability Analysis Of Transient Seepage Under Extreme Climates: Case Study Of Typhoon Nari In 2001, Chia-Feng Hsu, Lien-Kwei Chien
Journal of Marine Science and Technology
The effects of climate change, the inherent fragility of geological structures in Taiwan, and questionable developmental practices have led to the occurrence of numerous slope disasters, most of which were triggered by the extreme rainfall associated with typhoons. Therefore, this study collected rainfall data associated with typhoons striking northern Taiwan over the last 17 years, as a follow up to estimating database of extreme rainfall events. Most previous investigations regarding the impact of storms on slope stability focused on solutions with conditions, such as static groundwater levels or steady pore pressure. Previous studies have used software STABL to analyze slope …
Robust Stabilization Of Uncertain Switched Nonlinear Systems With Two Modes, Jian-Qiang Wang, Chee-Fai Yung
Robust Stabilization Of Uncertain Switched Nonlinear Systems With Two Modes, Jian-Qiang Wang, Chee-Fai Yung
Journal of Marine Science and Technology
In this note, based on a control Lyapunov function approach, an integrated design of switching laws and feedback controllers for uncertain switched nonlinear control systems with two modes is discussed. A sufficient condition for the existence of globally asymptotically stabilizing state feedback laws (switching laws+ controllers) is derived. Moreover, an explicit rule for constructing switching laws and an explicit formula for synthesizing feedback controllers are presented. An illustrative example is given for verifying the benefit of our approach.
Probability Calculation Method With Neural Network For Estimating Wave Overtopping At Coastal Structures: Learning From Regular Wave Tests, Ching-Piao Tsai, Karl-Friedrich Daemrich, Chuen-Lin Ho
Probability Calculation Method With Neural Network For Estimating Wave Overtopping At Coastal Structures: Learning From Regular Wave Tests, Ching-Piao Tsai, Karl-Friedrich Daemrich, Chuen-Lin Ho
Journal of Marine Science and Technology
An exact mathematical description of the wave overtopping processes is impossible due to the complex nature of the processes. Therefore the dependency of overtopping from wave parameters and coastal structures was mostly studied by physical model tests. To avoid the uncertainties due to imperfect statistics of wave heights in the irregular wave trains performed in physical models, the mean overtopping rates of irregular waves can be determined by the probability calculation method (PCM) (Goda, 2000) based on the regular wave data. The PCM combined with an artificial neural network (NN) technique is proposed in this paper to determine the mean …
Numerical Simulation Of Deep Excavation In Gravel Layers, Chien-Yi Wu, Shuh-Gi Chern
Numerical Simulation Of Deep Excavation In Gravel Layers, Chien-Yi Wu, Shuh-Gi Chern
Journal of Marine Science and Technology
This study analyzed gravel excavation cases in the Xindian District of Taiwan. Instead of the parameters typically employed in deep excavation analysis we used the deformations of diaphragm walls in a back analysis to achieve recommendations regarding the ideal range of the soil elastic modulus Es in the analysis parameters of numerical simulations for the Xindian District stratum or similar strata. We used Plaxis 2D software to analyze the gravel layer. The results indicated that, when the fifth layer of gravel was set to N = 100 and the range of the soil elastic modulus Es was set between 7.84N …
Unbalanced Load Compensation In Three-Phase Power System With A Current-Regulated Dstatcom Based On Multilevel Converter, Wei-Neng Chang, Ching-Huan Liao, Po-Li Wang
Unbalanced Load Compensation In Three-Phase Power System With A Current-Regulated Dstatcom Based On Multilevel Converter, Wei-Neng Chang, Ching-Huan Liao, Po-Li Wang
Journal of Marine Science and Technology
In this paper, a current-regulated distribution-level static synchronous compensator (DSTATCOM) is proposed for real-time unbalanced load compensation in three-phase electric power distribution systems. The main circuit of the DSTATCOM uses multilevel cascade full H-bridge converter with delta-connected configuration, which is suitable for high-voltage, high-power applications. The compensation algorithm of the DSTATCOM is derived in the phasor domain. Preliminary verification of the DSTATCOM is executed with MatLab/SimuLink program. Finally, a hardware prototype is built for testing. Experimental results confirm the effectiveness of the proposed DSTATCOM for real-time unbalanced load compensation.
The Composite Design Of H?^?-Erl Sliding-Mode Controller, Shun-Min Wang, Zhi-Hao Chen, Cheng-Neng Hwang
The Composite Design Of H?^?-Erl Sliding-Mode Controller, Shun-Min Wang, Zhi-Hao Chen, Cheng-Neng Hwang
Journal of Marine Science and Technology
In a multi-input multi-output nonlinear system, because the system is subjected to the impacts of external disturbances and parametric uncertainties, its output response may not be able to satisfy the desired specification or even may make the system unstable. The H-ERL sliding mode controller proposed in this paper is motivated to solve these problems. This controller utilizes the concept of sliding mode controller with ERL (Exponential Reaching Law) as its major framework, and then uses Lyapunov stability theorem to ensure the closedloop stability when the system encounters prescribed external disturbances and parametric uncertainties. For the optimal selection of the adjustable …
The Development Of New Type Free-Fall Lifeboat Using Fluid Structure Interaction Analysis, Ahmad Fauzan Zakki, Aulia Windyandari, Dong Myung Bae
The Development Of New Type Free-Fall Lifeboat Using Fluid Structure Interaction Analysis, Ahmad Fauzan Zakki, Aulia Windyandari, Dong Myung Bae
Journal of Marine Science and Technology
Freefall lifeboats provide a safe alternative to conventional lifeboats for emergency evacuation from ships and offshore platforms. The international regulations require that a lifeboat for free-fall launching should be able to give protection against impact accelerations when it is launched with its full occupants and equipment from at least the maximum designed height. Since the height of offshore structure to the water surface is significantly high, during the water entry phase the acceleration response of the free-fall lifeboat might cause an injury to the occupants. The special hull form design should be applied to reduce the acceleration. The aim of …
Influence Of Shot-Peening-Induced Residual Stresses On Post-Necking Behavior Of Tempered Ultrahigh-Strength Low Alloy 300m Steel, Shing-Hoa Wang, Yi-Ming Jen, Yu-Cyuan Lin, Bee-Fong Wu, Hsiu-Chuan Hsu, Ji-Jung Yeh
Influence Of Shot-Peening-Induced Residual Stresses On Post-Necking Behavior Of Tempered Ultrahigh-Strength Low Alloy 300m Steel, Shing-Hoa Wang, Yi-Ming Jen, Yu-Cyuan Lin, Bee-Fong Wu, Hsiu-Chuan Hsu, Ji-Jung Yeh
Journal of Marine Science and Technology
The effect of the tempering temperature and shot peening time on the uniaxial post-necking behavior of 300M steel (silicon-modified AISI 4340 steel) was experimentally investigated in this study. Normalized specimens were divided into two groups: one tempered at 280C and the other tempered at 302C. The specimens were shot-peened for various durations to study the effect of the shot peening time on their mechanical properties. Experimental results showed that the shot-peeninginduced compressive residual stress in the specimens tempered at 302C was greater than that in the specimens tempered at 280C, and the optimum compressive residual stress was obtained by shot …
On Wave Interaction With Floating Structures With Dragged Moorings, Po-I Chen, Cheng-Tsung Chen, Jaw-Fang Lee
On Wave Interaction With Floating Structures With Dragged Moorings, Po-I Chen, Cheng-Tsung Chen, Jaw-Fang Lee
Journal of Marine Science and Technology
This study developed an analytical solution in the frequency domain that considers the interactions among waves, floating structures, and mooring lines. The proposed solution was applied to investigate a problem involving a moored floating structure subjected to incident waves. The floating structure was considered as moving with three degrees of freedom, namely surge, heave, and roll. The mooring lines were simplified as springs, and the springs were assumed to be subjected to a Morison-type wave force. In the proposed solution, the wave field is first expressed as a problem involving a superposition of scattering and radiation waves. The wave field …
The Hydrodynamic Characteristics Of An Inclined Submerged Porous Plate With Rock Filled Structure, Ching-Yun Yueh, Shih-Hsuan Chuang, Chih-Hao Su
The Hydrodynamic Characteristics Of An Inclined Submerged Porous Plate With Rock Filled Structure, Ching-Yun Yueh, Shih-Hsuan Chuang, Chih-Hao Su
Journal of Marine Science and Technology
In this paper, we investigate the hydrodynamic efficiency of normal incident waves interacting with an absorbing system. The wave absorbing system consists of a submerged permeable structure filled with rock, a solid back wall, and a submerged horizontal or slightly inclined porous plate. Using a linear wave theory assumption, a multi-domain BEM (MBEM) model was created to calculate and discuss the reflection coefficients, free surface wave profiles, total wave force on the solid wall, and the horizontal and uplift forces acting on the porous plate of the water waves from several properties of the breakwater. The numerical model was calibrated …
Velocity-Based Egress Model For The Analysis Of Evacuation Process On Passenger Ships, Yoon-Ok Cho, Sol Ha, Kwang-Phil Park
Velocity-Based Egress Model For The Analysis Of Evacuation Process On Passenger Ships, Yoon-Ok Cho, Sol Ha, Kwang-Phil Park
Journal of Marine Science and Technology
This study presents a velocity-based egress model, which takes into account different aspects of human behavior in an emergency situation, for the evacuation analysis on passenger ships. It was supposed that the egress model consists of three behaviors: individual, crowd, and emergency behavior. The individual behavior was represented by the body shape, walking speed, walking direction, and rotation of each passenger. The basic walking direction of each passenger was obtained as a solution to the shortest distance route to a destination using a visibility graph. The crowd behavior of the passengers was composed of two components: one is a flock …
Soft Computing Technologies In Design Of Fuzzy Controller For Active Vibration Isolation Systems, Inn-Tong Chiu, Chih-Chung Fang
Soft Computing Technologies In Design Of Fuzzy Controller For Active Vibration Isolation Systems, Inn-Tong Chiu, Chih-Chung Fang
Journal of Marine Science and Technology
In the paper, we develop a two-phase design approach for a fuzzy logic controller (FLC) of an active vibration isolation system, which adopts two components of soft computing techniques, namely fuzzy logic control theory and neural networks. First, we design a fuzzy logic controller for an active vibration isolation system using fuzzy logic control theory. We conduct numerical simulations of an active vibration isolation system with three kinds of exciting loads. The results indicate that the performance of the fuzzy logic controller is very good, but its control rule surface does not measure up in practical terms. Secondly in the …
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 …
Effect Of Cooling Rate During Solution Heat Treatment On The Microstructure And Mechanical Properties Of Sp-700 Titanium Alloys, Jo-Kuang Nieh, Chih-Ting Wu, Yen-Lin Chen, Chao-Nan Wei, Sheng-Long Lee
Effect Of Cooling Rate During Solution Heat Treatment On The Microstructure And Mechanical Properties Of Sp-700 Titanium Alloys, Jo-Kuang Nieh, Chih-Ting Wu, Yen-Lin Chen, Chao-Nan Wei, Sheng-Long Lee
Journal of Marine Science and Technology
The relationship between the microstructures and the mechanical properties of solution-treated SP-700 titanium alloys, as obtained with different cooling rates, was investigated. The results indicate that the water-quenched alloy contains the primary (p), ”-martensite and residual (r) phases. Aging heat treatment can convert both ”-martensite and the r phases to the fine-grained + equilibrium phases, resulting in a significant increase in tensile strength and hardness. Both the air-cooled and furnace-cooled alloys consist of the p, and phases. The air-cooled alloy containing the fine-grained phase has relatively higher hardness. Aging heat treatment causes only …
Effect Of Battery Energy Storage Systems On The Value Of An Intermittent Wind Energy Source In Isolated Systems, Chun-Lung Chen
Effect Of Battery Energy Storage Systems On The Value Of An Intermittent Wind Energy Source In Isolated Systems, Chun-Lung Chen
Journal of Marine Science and Technology
The increase in environmental protection awareness and the progressive exhaustion of conventional fossil energy sources have increased interests in integrating wind energy sources into existing power systems. Despite the various benefits of wind power, the intermittency and unpredictability of wind power generation cause operational concerns and waste usable capacity as the installation of the wind generation sources increases. To enhance the value of an intermittent wind energy source by using a battery energy storage system (BESS), an iterative algorithm that combines improved dynamic programming and a hybrid direct search method were developed for solving the optimal wind-thermal-battery coordination scheduling (WTBCS) …
The Study On The Non-Linear Dynamic Causal Relationships Between Construction Index And Its Materials Indexes, Yih-Chang Wang, Ran Huang, Chien-Chung Nieh, Tsai-Lung Weng
The Study On The Non-Linear Dynamic Causal Relationships Between Construction Index And Its Materials Indexes, Yih-Chang Wang, Ran Huang, Chien-Chung Nieh, Tsai-Lung Weng
Journal of Marine Science and Technology
This paper aims to examine the short-run and long-run nonlinear dynamic relationship between indexes of construction and cement or steel in the Taiwan stock markets over the 1995- 2011 periods. In addition to traditional linear co-integration tests, the threshold co-integration and asymmetric threshold error-corrrection models (TECM) suggested by Enders and Siklos (2001) are used. Linear co-integration tests reveal no co-integration between the construction index and either of the cement and steel indexes, while threshold co-integration tests show existence of the co-integration relationship and asymmetric adjustment. Further analysis from TECM Granger causality tests finds evidence of a bi-directional causality between cement …
Establishment Of Effective Metamodels For Seakeeping Performance In Multidisciplinary Ship Design Optimization, Dongqin Li, Philip A Wilson, Xin Zhao
Establishment Of Effective Metamodels For Seakeeping Performance In Multidisciplinary Ship Design Optimization, Dongqin Li, Philip A Wilson, Xin Zhao
Journal of Marine Science and Technology
Ship design is a complex multidisciplinary optimization process to determine configuration variables that satisfy a set of mission requirements. Unfortunately, high fidelity commercial software for the ship performance estimation such as Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) is computationally expensive and time consuming to execute and deters the ship designer’s ability to explore larger range of optimization solutions. In this paper, the Latin Hypercube Design was used to select the sample data for covering the design space. The percentage of downtime, a comprehensive seakeeping evaluation index, was also used to evaluate the seakeeping performance within the short-term …
Hydraulic System Design And Structural Analysis Of A Bop Gantry Crane, Hyun-Ji Kim, Gwi-Nam Kim, Chang-Kweon Jeong, Young-Hwan Yoon, Yong-Gil Jung, Sun-Chul Huh
Hydraulic System Design And Structural Analysis Of A Bop Gantry Crane, Hyun-Ji Kim, Gwi-Nam Kim, Chang-Kweon Jeong, Young-Hwan Yoon, Yong-Gil Jung, Sun-Chul Huh
Journal of Marine Science and Technology
A blowout preventer (BOP) gantry crane is an offshore plant that moves a BOP stack located on a drilling platform to a BOP trolley. However, such a plant has yet to be developed in Korea. Because BOP gantry cranes produced overseas are expensive, developing such cranes domestically is imperative. In this study, ANSYS was used to conduct a structural analysis on a BOP gantry crane model to simulate the roll and pitch motions of a drillship that were induced by waves and wind load as well as the weight of the crane. Moreover, Simulation X was used for implementing control-system …
Using Principal Component Analysis With A Back-Propagation Neural Network To Predict Industrial Building Construction Duration, Sou-Sen Leu, Chi-Min Liu
Using Principal Component Analysis With A Back-Propagation Neural Network To Predict Industrial Building Construction Duration, Sou-Sen Leu, Chi-Min Liu
Journal of Marine Science and Technology
Industrial businesses must respond efficiently to market demands; therefore, industrial construction must accurately predict the project duration at the pre-investment stage. In practice, project duration predictions rely on the experience of project managers. To provide impartial expertise and quantitative estimate the predicted duration of constructing an industrial building, an extensive history of industrial building cases were collected to form a database. Principal component analysis was applied to the database to identify key factors to serve as input data for a back-propagation neural network (BP-NN) that was used to estimate the project duration. Three prediction models were identified and developed separately …