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- Sliding mode control (4)
- Chattering phenomenon (2)
- A356 alloy (1)
- Abrasion coefficient (1)
- Backlight (1)
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- Bernoulli's sum (1)
- Blast resistance (1)
- Blue Highway (1)
- Boundary layers (1)
- CCFL (1)
- CPT (1)
- Carriage maintenance (1)
- Chattering (1)
- Common duct (1)
- Configuration management (1)
- Coral reef ecosystem (1)
- Corrosion circulation (1)
- Corrosion tube (1)
- D. E. R. evaluation method (1)
- Decision-feedback equalizer (1)
- Delay-locked loop (1)
- Diffuser valve (1)
- Digital signal processor (1)
- Direct tensile strength (1)
- Direct-sequence spread spectrum (1)
- Discrete choice model (1)
- Discrete-time output feedback (1)
- Discrete-time variable structure control (1)
- Dynamic damping coefficient (1)
- Dynamic stiffness (1)
Articles 1 - 28 of 28
Full-Text Articles in Engineering
Theoretical Elucidation On The Corrosion Tube Growth Mechanism Of Mild Steel In The Effect Of Ph On Oxygen Corrosion At Elevated Pressures, Ming-Te Liang
Journal of Marine Science and Technology
The major purpose of this paper is the theoretical elucidation of the corrosion tube growth mechanism of mild steel occurred from the effect of pH value and oxygen corrosion at elevated pressure provided by Riggs et al. [6]. Based on the Nernst-Planck equation, continuity principle, Green's theorem, Stokes's theorem and the equation of Newton's second law of motion, the mechanism of corrosion tube development can be explained theoretically. The Bernoulli sum is contant at any cross-section of tubular corrosion product. The implication of the present results are theoretically enhanced the formation of corrosion tube mechanism.
Discrete-Time Output Feedback Sliding Mode Control For Uncertain Systems, Ming-Chang Pai
Discrete-Time Output Feedback Sliding Mode Control For Uncertain Systems, Ming-Chang Pai
Journal of Marine Science and Technology
This paper presents a discrete-time output feedback sliding mode control to stabilize a class of linear uncertain systems in which the state is unavailable and no estimated state is required. The proposed sliding mode controller is derived to guarantee the existence of quasi-sliding mode by using output feedback only and the stability of overall closed-loop system is assured. This scheme ensures the robustness against parametric uncertainties and disturbances. Neither chattering phenomenon will occur nor the knowledge of upper bound of uncertainties is required. Simulation results demonstrate the efficacy of the proposed control methodology.
Assessment Of Ground Shaking In Ilan County, Taiwan, Hui-Mi Hsu, Sao-Jeng Chao, Howard Hwang
Assessment Of Ground Shaking In Ilan County, Taiwan, Hui-Mi Hsu, Sao-Jeng Chao, Howard Hwang
Journal of Marine Science and Technology
This paper presents an estimation of ground shaking intensity in the Ilan area caused by two scenario earthquakes. On the basis of seismic activity in the study area, the seismic zones, including Okinawa trough seismic zone section A and Suao-Hualien offshore seismic zone are established. The earthquakes occurring in these two zones are considered as the scenario earthquakes. The hundreds of boring logs are also collected and classified into three site classes as specified in the Taiwan Seismic Building Code. The intensity of ground shaking in the Ilan area caused by a scenario earthquake is then estimated by using an …
The Study Of Price Accept Threshold For The ??Lue Highway??Tour Of The North-East Region In Taiwan, Hung-Yen Chou, Jin-Long Lu, Chiang Fu
The Study Of Price Accept Threshold For The ??Lue Highway??Tour Of The North-East Region In Taiwan, Hung-Yen Chou, Jin-Long Lu, Chiang Fu
Journal of Marine Science and Technology
The “Blue Highway” in the NE region of Taiwan includes the tour itineraries of Keelung-Suao, Suao-Hualien and Keelung-Hualien, each with its individual oceanic scenic features and its potential corresponding onshore scenic spots. This study explores the relationship between the “Blue Highway” tour portfolios and price attributes to collect the preference recognition of the public concerning the NE region “Blue Highway” tour itineraries and prices with the stated preference method. The utility function of the discrete choice model assumes the impact effect among attributes to be in a linear relationship plus percentages. The price threshold model improves the assumption of this …
Study On Mechanical Properties Of A356 Alloys Enhanced With Preformed Thixotropic Structure, Shueiwan H. Juang, Shyh-Ming Wu
Study On Mechanical Properties Of A356 Alloys Enhanced With Preformed Thixotropic Structure, Shueiwan H. Juang, Shyh-Ming Wu
Journal of Marine Science and Technology
A preformed A356 alloys with thixotropic structure (designated SSM-A356) was systematically studied on mechanical properties in order to establish the database for further investigations in forming and heat treatment. Because of the specific microstructure and characteristics, the heat treatment conditions of SSM-A356 were explored through the observations of microstructure and the measurement of micro-hardness. In the investigation of heat treatment, it was observed that the eutectic silicon was refined and spheroidized which is unlikely for conventional processing. The mechanical testing results showed that the yield and ultimate tensile strength of SSM-A356 were respectively around 115% and 34% greater than those …
Case Study Of Wind-Resistant Design And Analysis Of High Mast Structures Based On Different Wind Codes, Ching-Wen Chien, Jing-Jong Jang
Case Study Of Wind-Resistant Design And Analysis Of High Mast Structures Based On Different Wind Codes, Ching-Wen Chien, Jing-Jong Jang
Journal of Marine Science and Technology
The high mast structure (HMS) has the characters of light weight and high cost efficiency. Therefore, it is widely used in the modern construction industry. It has a large the ratio of height (H) to least horizontal dimension (D) that makes it a particularly more slender and wind-sensitive than any other structures. Therefore, the purpose of this research is to develop the wind-resistant design (WRD) procedure for the slender, tapered support structures of HMS subjected to wind-induced excitation from vortex shedding and gust buffeting. This paper illustrates the theoretical basis and the analytical development of the WRD; including calculating gust …
The Manpower Supply Planning And Shift Setting For Mass Rapid Transit Carriage Maintenance In Short-Term Operations, Shangyao Yan, Chia-Hung Chen, Miawjane Chen
The Manpower Supply Planning And Shift Setting For Mass Rapid Transit Carriage Maintenance In Short-Term Operations, Shangyao Yan, Chia-Hung Chen, Miawjane Chen
Journal of Marine Science and Technology
An effective carriage maintenance plan cannot only reduce the mass rapid transit system operating costs, but is also directly related to its safety and schedule punctuality. Traditionally, the arrangement of the carriage maintenance manpower supply has been based on staff experience, and has been performed manually following simple rules. This is not only time-consuming but often ineffective. Therefore, in this research, we incorporate flexible management strategies, different combinations of principles, and the related operating constraints, to develop a basic carriage maintenance manpower supply plan model. Furthermore, we construct an integrated model by modifying the basic model, which can help an …
Impact Of Fire-Through And Misfire In Rectifier Valves On A Turbine Generator Neighboring To A Hvdc Inverter Station, Ming-Te Liang
Impact Of Fire-Through And Misfire In Rectifier Valves On A Turbine Generator Neighboring To A Hvdc Inverter Station, Ming-Te Liang
Journal of Marine Science and Technology
The major purpose of this paper is the theoretical elucidation of the corrosion tube growth mechanism of mild steel occurred from the effect of pH value and oxygen corrosion at elevated pressure provided by Riggs et al. [6]. Based on the Nernst-Planck equation, continuity principle, Green's theorem, Stokes's theorem and the equation of Newton's second law of motion, the mechanism of corrosion tube development can be explained theoretically. The Bernoulli sum is contant at any cross-section of tubular corrosion product. The implication of the present results are theoretically enhanced the formation of corrosion tube mechanism.
Variable-Thickness Boundary Layers For Sliding Mode Control, Chyun-Chau Fuh
Variable-Thickness Boundary Layers For Sliding Mode Control, Chyun-Chau Fuh
Journal of Marine Science and Technology
Sliding mode control is a nonlinear feedback control technique which provides good robustness against modeling uncertainties and external disturbances. However, as the uncertainties or disturbances increase, a greater control input is required, and the control signal may cause an undesirable chattering phenomenon. In general, the further the system trajectory from the origin, the more violent the chattering effect. However, as the trajectory moves closer to the origin, the degree of chattering gradually reduces. As a result, even if an attempt is made to eliminate chattering by introducing a small constant boundary layer around the sliding surface, the chattering phenomenon may …
Dynamic Reynolds Equation For Micropolar Fluid Lubrication Of Porous Slider Bearings, Neminath Bhujappa Naduvinamani, Gudadappagouda Basanagouda Marali
Dynamic Reynolds Equation For Micropolar Fluid Lubrication Of Porous Slider Bearings, Neminath Bhujappa Naduvinamani, Gudadappagouda Basanagouda Marali
Journal of Marine Science and Technology
In this paper an attempt has been made to study the rheological effects of micropolar fluid lubricants on the steady state and dynamic behavior of porous slider bearings by considering the squeezing action. The general modified Reynolds-type equation of porous sliding-squeezing surfaces with micropolar fluids is derived for the assessment of dynamic characteristics of bearings with general film thickness. The detailed analysis is presented for the plane inclined porous slider bearings by using perturbation method. Two Reynolds-type equations corresponding to steady performance and perturbed characteristics are obtained. The closed form solution of these equations is obtained. The numerical computations of …
Effect Of Steel Fiber On The Mechanical Properties Of Cement-Based Composites Containing Silica Fume, Wei-Ting Lin, Ran Huang, Chin-Lai Lee, Hui-Mi Hsu
Effect Of Steel Fiber On The Mechanical Properties Of Cement-Based Composites Containing Silica Fume, Wei-Ting Lin, Ran Huang, Chin-Lai Lee, Hui-Mi Hsu
Journal of Marine Science and Technology
An experimental program was carried out to evaluate the mechanical properties of cement-based composites. Test variables included water to cementitious ratio, dosage of silica fume and volume fraction of steel fiber. Compressive strength test, direct tensile strength test, splitting tensile strength test, abrasion resistance test and drop weight test were performed and the results were analyzed statistically. According to the results of this study, the designed direct tensile testing method was a suitable method to estimate the tensile strength of fiber cement-based composites. Addition of fibers provided better performance for the cement-based composites, while silica fume in the composites would …
Determining The Repair Ranking Of Existing Rc Bridges Using Multi-Pole Fuzzy Pattern Recognition Evaluation Method, Ming-Te Liang, Ting- Bang Chu, Wen-Hu Tsao, Chi-Jang Yeh
Determining The Repair Ranking Of Existing Rc Bridges Using Multi-Pole Fuzzy Pattern Recognition Evaluation Method, Ming-Te Liang, Ting- Bang Chu, Wen-Hu Tsao, Chi-Jang Yeh
Journal of Marine Science and Technology
This paper proposes a technique for determining the repair ranking of existing reinforced concrete (RC) bridges using the multi-pole fuzzy pattern recognition evaluation method. The differences between bridges and grades are expressed by weighted generalized weight distance. To find the optimal relative membership degree of an evaluated bridge attributed to any grade, the operative principle is that the sum of the square of weighted generalized weight distance is minimum. Based on this principle, the problem of extreme value is established by the objective function in connection with constraint condition. Using the Lagrangean method, the multi-pole fuzzy pattern recognition evaluation method …
Web-Based Information Management System For The Long Term Ecological Research Program In Kenting, Taiwan, Yang-Chi Chang, Meng-Tsung Lee, Kun-Chi Lai
Web-Based Information Management System For The Long Term Ecological Research Program In Kenting, Taiwan, Yang-Chi Chang, Meng-Tsung Lee, Kun-Chi Lai
Journal of Marine Science and Technology
This paper introduces a web-based information management system which has been set up as a collaborative facility to allow key environmental and ecological information access for the Long Term Ecological Research (LTER) in Kenting, Taiwan. The coral reef ecosystem degradation in Kenting has concerned both public and private sectors, for which a LTER team was formed to investigate the problem. A multi-functional web-based system integrates diverse data collections and analyses efforts of team members during the project span. It also provides authorities with effective information and knowledge for sustainable coral reef management. Three information technologies, web Database Management System (DBMS), …
Developing A Convective Code With Vorticity Transport In Upwind Method, Je -Ee Ho
Developing A Convective Code With Vorticity Transport In Upwind Method, Je -Ee Ho
Journal of Marine Science and Technology
The Navier-Strokes equations are usually used to solve the convective problems, however, to satisfy the conversation of mass, the uncertainty of pressure terms will easily trigger off the numerical divergence during the iterative process; which results in a calculating failure and makes the numerical solutions impossible. In this study, a vorticity–transport method that avoids the involvement of pressure terms by cross differentiate the governing equations and meets the flow conservation with stream function was proposed. With the aid of the upwind scheme and implicit method, an effective transformation from the partial differential equations into the vortex potential algebraic equations would …
Multi-Objective Control Design For Stochastic Large-Scale Systems Based On Lmi Approach And Sliding Mode Control Concept, Koan-Yuh Chang, Wen-Jer Chang
Multi-Objective Control Design For Stochastic Large-Scale Systems Based On Lmi Approach And Sliding Mode Control Concept, Koan-Yuh Chang, Wen-Jer Chang
Journal of Marine Science and Technology
In this paper, a controller u (t) i is designed for stochastic large-scale systems to achieve the following three objectives simultaneously: the pole placement constraint, H∞ norm constraint and individual state variance constraint. In terms of the invariance property of sliding mode control, both the uncertain interconnection terms and an unknown nonlinear function will disappear on the sliding mode. Then, with the aid of upper bound covariance control theory, pole placement skill and H∞ norm control theory, a controller, in which the control feedback gain matrix Gi is synthesized using linear matrix inequality approach, is derived to achieve the above …
Characteristic Study Of Mhd Minipump, Je -Ee Ho
Characteristic Study Of Mhd Minipump, Je -Ee Ho
Journal of Marine Science and Technology
The present study aims to develop and discuss the availability of the Magneto Hydrodynamics Minipump (MHD) as a miniaturizative part specified for precise manufacturing or medical application. Based on the MHD theory, an available working current (1.8A) induced by lower voltage (0-12V) and weaker magnetic intensity (0.04T) meets the need in mini-system operation. However, precise estimations of working capacity, maximum head, dynamic head, and static head in various electrolyte concentrations are necessary. Furthermore, this work also provides a simplified analytic model with a static balance between Lorentz force, surface tension force, and body force. Compared with analytic solutions and experimental …
Using Factor Analysis To Assess Route Construction Priority For Common Duct Network In Taiwan, Wei Tong Chen, Tung-Tsan Chen, Yung Pei Lin, Chien Lu
Using Factor Analysis To Assess Route Construction Priority For Common Duct Network In Taiwan, Wei Tong Chen, Tung-Tsan Chen, Yung Pei Lin, Chien Lu
Journal of Marine Science and Technology
This study identifies the critical variables for determining route construction priorities (RCP) in a common duct network (CDN) using expert interviews and questionnaire surveys. Statistical analysis is also conducted to check the validation and verification of the survey results. Furthermore, factor analysis is employed to derive 24 priority determinant variables and classify them into five groups, including utility agency, traffic condition, local government, infrastructure project, and site condition. The paired comparison method is then employed to determine the weightings of the five groups. It is found that the utility agency is the most important factor while the site condition is …
Cpt-Based Liquefaction Assessment By Using Fuzzy-Neural Network, Shuh-Gi Chern, Ching-Yinn Lee, Chin-Chen Wang
Cpt-Based Liquefaction Assessment By Using Fuzzy-Neural Network, Shuh-Gi Chern, Ching-Yinn Lee, Chin-Chen Wang
Journal of Marine Science and Technology
Because of the increasing popularity worldwide of the cone penetration test (CPT) for site characterization, significant progress on the simplified CPT-based methods has been made for evaluation of earthquake induced liquefaction potential of soils. In this study, a fuzzy-neural network combined with 466 CPT field observations is developed to evaluate liquefaction potential of soils. The proposed model combines fuzzy theory with subtractive clustering algorithm to establish a fuzzy-neural system. The study indicates that fuzzy-neural network can successfully describe the complex relationship between seismic parameters, soil parameters, and the liquefaction potential. The fuzzy-neural network model is found to have very good …
Service Quality Radar Map And Two-Stage Service Quality Score, Kee-Kuo Chen, Ding-Hsun Hsiao, Cheng-Hung Arthur Hsieh
Service Quality Radar Map And Two-Stage Service Quality Score, Kee-Kuo Chen, Ding-Hsun Hsiao, Cheng-Hung Arthur Hsieh
Journal of Marine Science and Technology
In an attempt to portray all information released from the service quality studies the service quality radar map (SQRM), is designed in this paper firstly and a generalized service quality score GSQS follows. GSQS is defined by way of the weighted average of differences between relative frequencies of customers’ performance perception and performance expectation, thus can avoid the problems involved in the gap-based SERVQUAL scale and caused by skewed distributions. A special case of GSQS, the stochastic dominance service quality score (SDSQS) whose ideal come from the second stochastic dominance criterion is used to illustrate how a standardized score can …
Optimization Of Diffuser Valves, Chin-Tsan Wang, Pi-Cheng Chang, Chien-Cheng Huang
Optimization Of Diffuser Valves, Chin-Tsan Wang, Pi-Cheng Chang, Chien-Cheng Huang
Journal of Marine Science and Technology
In this study, the width of channel, D, and diffuser angle, , at given diffuser width whose value is 100 m will be studied for steady and unsteady flow conditions. By means of a series of numerical simulations, some findings for diffuser valve will be reported. The diffuser valve with a channel width of D = 300 m and diffuser angle =60º, is a better geometry because of its outstanding capability on suction production of net volume flow. Besides, the larger the Reynolds number is, the greater the suction amount of net volume flow will be. When the aspect ratio …
Enhancement Of Shg In Fused Sio2 By Corona Poling Under Water, Water Vapor And Salty Environments, Chun-An Tsai, Jung Ning Wang, Wei-Kuo Chao, Tsung Yuan Cheng, Wan-Rone Liou, Adam Y. Wu
Enhancement Of Shg In Fused Sio2 By Corona Poling Under Water, Water Vapor And Salty Environments, Chun-An Tsai, Jung Ning Wang, Wei-Kuo Chao, Tsung Yuan Cheng, Wan-Rone Liou, Adam Y. Wu
Journal of Marine Science and Technology
We found that optical nonlinearity in SiO2 glass sample can be greatly enhanced when sample is poled in wet and salty environments, and the nonlinearity in the sample can be reduced drastically when sample is washed in water. Possible causes for the observed enhancement and reduction of optical nonlinearity in SiO2 glass are discussed.
Investigation On The Blast Resistance Of A Stiffened Door Structure, Ming-Wei Hsieh, Jui-Pin Hung, De-Jen Chen
Investigation On The Blast Resistance Of A Stiffened Door Structure, Ming-Wei Hsieh, Jui-Pin Hung, De-Jen Chen
Journal of Marine Science and Technology
This study was aimed at investigating the blast resistance of a stiffened door structure. For this, a series of finite element transient analysis were performed to predict the dynamic response of blast resistant doors. Current results show that the stiffeners have sustained the majority of the explosive loadings. The effect of stiffener size on the stress state was rated in terms of the ratio of stiffener stress to plate stress, which was enhanced with the increase of web thickness of stiffener. Additional, the highest stresses were shown to occur at the transverse stiffeners near the hinged sides with a maximum …
Robust Control Of Uncertain Time-Delay Systems Via Sliding Mode Control And Lmi- H∞ Technique, Ming-Chang Pai
Robust Control Of Uncertain Time-Delay Systems Via Sliding Mode Control And Lmi- H∞ Technique, Ming-Chang Pai
Journal of Marine Science and Technology
This paper presents a proportional-integral sliding mode control (PISMC) methodology for a class of linear uncertain systems with state delays. The systems are assumed to have structured, mismatched, and time-varying parameter uncertainties as well as mismatched and bounded external disturbances. Based on Lyapunov stability theorem and linear matrix inequality (LMI) H∞ technique, a sufficient condition is derived to guarantee the global stability of the dynamics and a prescribed H∞ norm bound of disturbance attenuation for all admissible uncertainties. Furthermore, this scheme assures robustness against state delays, parameter uncertainties and disturbances. Finally, an example is given to illustrate the feasibility of …
Application Of Maximum-Efficiency Tracking Control To Backlight Module Based On Phase-Locked Loop Technique, Chang-Hua Lin, Ying Lu
Application Of Maximum-Efficiency Tracking Control To Backlight Module Based On Phase-Locked Loop Technique, Chang-Hua Lin, Ying Lu
Journal of Marine Science and Technology
Maximum-efficiency tracking control applied in the backlight module is proposed in this paper. The backlight system incorporates a phase-locked loop (PLL) as a feedback mechanism to promote both the system efficiency and stability. To overcome the drawbacks of the conventional electromagnetic transformer and to miniaturize the backlight module, the piezoelectric transformer (PT) is adopted for driving the cold cathode fluorescent lamp (CCFL). To avoid the system efficiency decreases due to the temperature effect of PT, the PLL is utilized to track immediately the optimal operating frequency of PT for achieving maximum output efficiency under various ambient temperatures. The feedback parameter …
Factor Analysis Of Interface Problems Among Construction Parties - A Case Study Of Mrt, Rong-Yau Huang, Chin-Tien Huang, Hung Lin, Wen-Hsiang Ku
Factor Analysis Of Interface Problems Among Construction Parties - A Case Study Of Mrt, Rong-Yau Huang, Chin-Tien Huang, Hung Lin, Wen-Hsiang Ku
Journal of Marine Science and Technology
With the rapid development of technology and the increasingly bigger size of constructions, the involved parties are required to pay more attention to all types of difficult interface problems than ever before. By considering the mass rapid transit system (MRTS) as an example, several problems resulting from complicated mechanical, electrical, civil, and track interfaces led to enormously extra losses in the construction process. Accordingly, this paper intends to use quantitative methods to categorize a variety of interface problems in the MRTS construction projects as well as identify their individual impacts in order to clarify these interface problems. The analysis results …
Profile Design Of Piston Ring Using Inverse Method, Li-Ming Chu, Yuh-Ping Chang, Jung-Hua Yang
Profile Design Of Piston Ring Using Inverse Method, Li-Ming Chu, Yuh-Ping Chang, Jung-Hua Yang
Journal of Marine Science and Technology
This study aims to develop an algorithm for designing the piston ring profile and pressure distribution using an inverse method. The proposed algorithm needs to obtain load and boundary conditions for estimating not only a smooth curve in the piston ring profile, but also in the pressure distribution. The algorithm is developed from Reynolds integral and force balance equations. The least-squares error method, variational method, Gauss-Seidel method and Newton-Raphson method are employed to calculate the piston ring profile. Simulation results reveal that the greater the degree of the polynomial function used, the greater the maximum pressure ( Pmax ), load …
Design And Implementation Of An All-Digital Real-Time Underwater Acoustic Transceiver Using Digital Signal Processors, Fu-Sheng Lu, Ching-Hsiang Tseng, Bin-Chong Wu
Design And Implementation Of An All-Digital Real-Time Underwater Acoustic Transceiver Using Digital Signal Processors, Fu-Sheng Lu, Ching-Hsiang Tseng, Bin-Chong Wu
Journal of Marine Science and Technology
In this paper, an all-digital transceiver for real-time underwater acoustic (UWA) communications is developed using digital signal processors (DSPs). The design of the transceiver is based on the direct-sequence spread-spectrum (DS/SS) modulation scheme, in which the timing synchronization is efficiently achieved by employing a sliding correlator and a modified noncoherent delay-locked loop for code acquisition and tracking, respectively. In addition, an equal-gain combiner (EGC) and an adaptive decision-feedback equalizer (DFE) are included in the receiver to enhance its interference rejection capability under multipath fading environments. Several real-time UWA transmission tests are conducted in an experimental water tank to evaluate the …
Guaranteed Cost Control Of Uncertain Linear Systems Via Discrete-Time Variable Structure Control, Ming-Chang Pai
Guaranteed Cost Control Of Uncertain Linear Systems Via Discrete-Time Variable Structure Control, Ming-Chang Pai
Journal of Marine Science and Technology
This paper presents a design of realizing the guaranteed cost control problem for uncertain linear systems via discrete-time variable structure control (VSC) scheme. The uncertainties in the system are assumed to be norm-bounded and time-varying. Based on the discrete-time VSC technique, the proposed controller can drive the system into a pre-specified switching surface to obtain the desired dynamic performance and the chattering phenomenon is eliminated. Sufficient conditions for the existence of guaranteed cost control are presented, and the problem of designing guaranteed cost control is converted to a convex optimization problem with linear matrix inequality (LMI) constraints. Finally, simulation results …