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Articles 61 - 81 of 81
Full-Text Articles in Engineering
Robust Control For Coaxial Two-Wheeled Electric Vehicle, Jia-Sheng Hu, Mi-Ching Tsai, Feng-Rung Hu, Yoichi Hori
Robust Control For Coaxial Two-Wheeled Electric Vehicle, Jia-Sheng Hu, Mi-Ching Tsai, Feng-Rung Hu, Yoichi Hori
Journal of Marine Science and Technology
This paper investigates robust motion pilot control of a coaxial two-wheeled electric vehicle (CTWEV) where the feedback control system is solely based on the angle of inclination without using any velocity information. H∞ control is employed to design a robust stabilizing controller. The proposed scheme involves an electronic differential steering algorithm to pilot the CTWEV via a joystick. Finally, evaluation examples and simulations are provided to demonstrate the effectiveness of the system
Fabrication Of Microneedles, Yu-Tang Chen, Chin-Chun Hsu, Chieh-Hsiu Tsai, Shung-Wen Kang
Fabrication Of Microneedles, Yu-Tang Chen, Chin-Chun Hsu, Chieh-Hsiu Tsai, Shung-Wen Kang
Journal of Marine Science and Technology
This research utilizes two kinds of materials to fabricate the ideal shape of microneedles, polymer microneedles and silicon microneedles, with 236 µm and 350 µm in height respectively. First, we utilize the turning model technique to fabricate the polymer microneedles. The silicon wafer with V-groove is used as the model and the SU-8 2050 is the main material of microneedles. In addition, we also use the silicon as the material and adopt the wet-etching technology to make the silicon microneedles. By the characteristics of anisotropic etching and undercut, the silicon wafer will have the fast-etching plane and form the shape …
Wall Transpiration Effects On Developing Mixed Convection Heat Transfer In Inclined Rectangular Ducts, Jer-Huan Jang, Han-Chieh Chiu, Wei-Mon Yan
Wall Transpiration Effects On Developing Mixed Convection Heat Transfer In Inclined Rectangular Ducts, Jer-Huan Jang, Han-Chieh Chiu, Wei-Mon Yan
Journal of Marine Science and Technology
The developing mixed convection heat transfer in inclined rectangular ducts with wall transpiration effects has been investigated numerically in detail. The three-dimensional Navier-Stokes equations and energy equation are solved simultaneously with the vorticity- velocity method. For a given combination of governing parameters wall Reynolds number, Rew, aspect ratio γ, modified Rayleigh number, Ra* , and mixed convection parameter, Ω, the solution is evaluated by a marching technique. The effects of wall transpiration and the inclination angle on the distributions of the bulk fluid temperature, the local averaged friction factor and Nusselt number are emphasized in detail. Both conditions of uniform …
Strain Analysis Of Vapor Chamber Heat Spreaders, Yu-Hsun Hung, Shung-Wen Kang, Wan-Chun Tsai
Strain Analysis Of Vapor Chamber Heat Spreaders, Yu-Hsun Hung, Shung-Wen Kang, Wan-Chun Tsai
Journal of Marine Science and Technology
Vapor chamber is a cooling device with phase change phenomena. It not only provides high heat transfer coefficient but also removes hot spot. During working of vapor chamber, the buckle force and vapor pressure could lead to deformation. It is a popular way that pillars are set up to reduce deformation. This paper presents a three-dimensional finite element analysis for the vapor chamber by ANSYS software program. Four pillars with two kinds of designs are built into vapor core in order to avoid deformation of the vapor chamber. The results appear that pillars inside vapor chamber are good to reduce …
Simultaneous Measurement Of Deformation And Temperature Of High-Strength Concrete At Very Early Age To Determine The Initial And The Finial Setting Time, Shu-Ken Lin, Chung-Ho Huang, Chao-Shun Chang, Tsong Yen, Chung-Hao Wu, Yiching Lin
Simultaneous Measurement Of Deformation And Temperature Of High-Strength Concrete At Very Early Age To Determine The Initial And The Finial Setting Time, Shu-Ken Lin, Chung-Ho Huang, Chao-Shun Chang, Tsong Yen, Chung-Hao Wu, Yiching Lin
Journal of Marine Science and Technology
The interior shrinkage deformation and temperature change of high-strength concrete (HSC) at very early age, i.e., the first 24 h from casting, and up to an age of 72 h was investigated experimentally using optic fibre sensors (SOFO) and thermally sensitive resistors. The initial and the final setting times of HSC were also investigated. Results show that two turning points (I and II) on the development curve of deformation, both represent the onsets of the variation of rigidity in fresh HSC, can be recognized as the initial and the final setting times, which are evaluated around 4.5 h to 5.7 …
On Design Of Browser-Oriented Data Extraction System And The Plug-Ins, Jui-Yuan Su, Der-Johng Sun, I-Chen Wu, Lung-Pin Chen
On Design Of Browser-Oriented Data Extraction System And The Plug-Ins, Jui-Yuan Su, Der-Johng Sun, I-Chen Wu, Lung-Pin Chen
Journal of Marine Science and Technology
Web data extraction systems currently not only extract data on web pages but also need to navigate to the target correctly. Most traditional web data extraction systems extract URLs directly from web pages, and then access next pages using the extracted URLs. This data extraction approach is herein called the URL-oriented data extraction approach in this paper. However, currently, more and more web pages use script functions, such as JavaScript, to access next pages and may hide URLs inside these functions, making it difficult to extract URLs. In order to solve this problem, a new data extraction approach, named the …
Ahp Model For The Container Port Choice In The Multiple-Ports Region, Chien-Chang Chou
Ahp Model For The Container Port Choice In The Multiple-Ports Region, Chien-Chang Chou
Journal of Marine Science and Technology
In this paper, a theoretical analysis of the effect of surface roughness on the lubrication characteristics of inclined stepped composite bearings with micropolar fluid is examined. A generalized form of surface roughness is mathematically modeled by a stochastic random variable with non-zero mean, variance and skewness. The generalized average Reynolds type equation is derived for the rough inclined stepped composite bearings with micropolar fluid. The closed form expressions are obtained for the fluid film pressure, load carrying capacity, frictional force. These expressions can be utilized to obtain the performance characteristics of four different types of bearing system viz; rough plane …
On The Performance Of Rough Inclined Stepped Composite Bearings With Micropolar Fluid, Neminath Bhujappa Naduvinamani, Siddangouda Apparao
On The Performance Of Rough Inclined Stepped Composite Bearings With Micropolar Fluid, Neminath Bhujappa Naduvinamani, Siddangouda Apparao
Journal of Marine Science and Technology
This research utilizes two kinds of materials to fabricate the ideal shape of microneedles, polymer microneedles and silicon microneedles, with 236 µm and 350 µm in height respectively. First, we utilize the turning model technique to fabricate the polymer microneedles. The silicon wafer with V-groove is used as the model and the SU-8 2050 is the main material of microneedles. In addition, we also use the silicon as the material and adopt the wet-etching technology to make the silicon microneedles. By the characteristics of anisotropic etching and undercut, the silicon wafer will have the fast-etching plane and form the shape …
Novel Algorithms For Tracking Multiple Targets, Sheng-Yun Hou, Hsien-Sen Hung, Shun-Hsyung Chang, Jeng-Cheng Liu
Novel Algorithms For Tracking Multiple Targets, Sheng-Yun Hou, Hsien-Sen Hung, Shun-Hsyung Chang, Jeng-Cheng Liu
Journal of Marine Science and Technology
In this paper, two novel angle tracking algorithms are proposed for tracking multiple targets using an array of sensors with known locations. First, we present an extended Kalman particle filter (EKPF) which is capable of determining the direction-of-arrival (DOA) angles using a single snapshot of data during the interval between each time step. The proposed EKPF algorithm combines particle filtering with the extended Kalman filter (EKF) in order to prevent sample impoverishment during its resampling process. Next, we present a robust Kalman filter (RKF) tracking algorithm intended to improve tracking success rates of other existing algorithms for the case of …
Estimation Of Manning Roughness Coefficients On Precast Ecological Concrete Blocks, Te-Hsing Chang, Shen-Ting Huang, Shinne Chen, Jun-Cheng Lai
Estimation Of Manning Roughness Coefficients On Precast Ecological Concrete Blocks, Te-Hsing Chang, Shen-Ting Huang, Shinne Chen, Jun-Cheng Lai
Journal of Marine Science and Technology
Agricultural irrigation and drainage canals in Taiwan are generally constructed using concrete. Concrete is used for the safety of conveyance efficiency. It also reduced loss and is structurally safe. The irrigation ditches and soil revetments in Taiwan fitted with a strong concrete lining. The smooth nonporous concrete surface makes the biology perch difficult and causes a monotonous flow. For these reason, an artificial materials-precast ecological concrete blocks (PECBs) was developed in this research. This was done in order to modify both the traditional concrete lining and the natural field materials in canal construction. Precast ecological concrete blocks (PECBs) were tested …
A Delay-Dependent Approach To Robust Stability For Uncertain Stochastic Neural Networks With Time-Varying Delay, Chien-Yu Lu, Chin-Wen Liao, Koan-Yuh Chang, Wen-Jer Chang
A Delay-Dependent Approach To Robust Stability For Uncertain Stochastic Neural Networks With Time-Varying Delay, Chien-Yu Lu, Chin-Wen Liao, Koan-Yuh Chang, Wen-Jer Chang
Journal of Marine Science and Technology
This paper investigates the global delay-dependent robust stability in the mean square for uncertain stochastic neural networks with time-varying delay. The activation functions are assumed to be globally Lipschitz continuous. Based on a linear matrix inequality approach, globally delay-dependent robust stability criterion is derived by introducing some relaxation matrices which, when chosen properly, lead to a less conservative result. Two numerical examples are given to illustrate the effectiveness of the method.
Fast Block Matching Using Minkowski's Inequality, Jim Zong-Chang Lai, Yi-Ching Liaw, Shih-An Fong
Fast Block Matching Using Minkowski's Inequality, Jim Zong-Chang Lai, Yi-Ching Liaw, Shih-An Fong
Journal of Marine Science and Technology
In this paper, we present a fast block matching algorithm by making use of the Minkowski’s inequality. Combined with other fast block matching algorithms, our method can further reduce the computational complexity significantly with little PSNR degradation. Compared to the full search block matching algorithm, our approach can reduce the computing time by a factor of 6.4 to 21.5. Compared to MSEQ, which is a wellknown block matching algorithm preserving global optimality, our method can further reduce the corresponding computing time in average by 32.4%. The combination of our algorithm and the predictive search area approach for block motion estimation …
Shape Optimization Of One-Chamber Mufflers With Reverse-Flow Ducts Using A Genetic Algorithm, Min-Chie Chiu
Shape Optimization Of One-Chamber Mufflers With Reverse-Flow Ducts Using A Genetic Algorithm, Min-Chie Chiu
Journal of Marine Science and Technology
Shape optimization on mufflers within a limited space is essential for industry where the equipment layout is occasionally tight and the available space for a muffler is limited for maintenance and operation purposes. To proficiently enhance the acoustical performance within a constrained space, the selection of an appropriate acoustical mechanism and optimizer becomes crucial. A one-chamber muffler hybridized with reverse-flow ducts which can visibly increase the acoustical performance is rarely addressed; therefore, the main purpose of this paper is to numerically analyze and maximize the acoustical performance of this muffler within a limited space. In this paper, the four-pole system …
Estimation Model Of Transformer Iron Loss Using Neural Network, Tai-Ken Lu, Chien-Ta Yeh, Min-Doon Dirn
Estimation Model Of Transformer Iron Loss Using Neural Network, Tai-Ken Lu, Chien-Ta Yeh, Min-Doon Dirn
Journal of Marine Science and Technology
When we want to calculate the transformer iron loss in operation, in addition to considering the nonlinear hysteretic phenomenon of transformer itself and the natural unbalanced characteristic, the actual situation that the transformer is operated under three phase unbalance state should also be considered. This results in very non-regular change of the transformer iron loss, and the accuracy of the polynomial model that is commonly used to estimate the iron loss of the transformer in the past is thus reduced. Since neural network has parallel processing capability, which can process highly nonlinear function problem, hence, in this study, we try …
Experimental Study Of Deformation Behavior And Fatigue Life Of Aisi 304 Stainless Steel Under An Asymmetric Cyclic Loading, Yung-Chuan Chiou
Experimental Study Of Deformation Behavior And Fatigue Life Of Aisi 304 Stainless Steel Under An Asymmetric Cyclic Loading, Yung-Chuan Chiou
Journal of Marine Science and Technology
In this study, the cyclic deformation behavior and fatigue life of AISI 304 stainless steel with or without mean strains were studied experimentally. In the case of fully reversal cyclic straining, it is found that there is no virtually difference between the cyclic stress response curves in tension and in compression at strain amplitude of higher than 0.30%. At the controlled strain amplitude of 0.25% and 0.30%, the two cyclic stress response curves are separated quite widely. The degree of asymmetry can be attributed to the anisotropic behavior of AISI 304 stainless steel. Further, the experimental results indicate that AISI …
Optimal Heating And Energy Management For Slabs In A Reheating Furnace, Wei-Hsin Chen, Mu-Rong Lin, Tzong-Shyng Leu
Optimal Heating And Energy Management For Slabs In A Reheating Furnace, Wei-Hsin Chen, Mu-Rong Lin, Tzong-Shyng Leu
Journal of Marine Science and Technology
Optimal heating for slabs in a reheating furnace is investigated numerically to aid in managing energy consumption of the reheating furnace in a hot strip mill, where an arctangent function is applied as the heating curve. Particular attention is paid to the relationship among the temperature uniformity, discharging target temperature and retention time of the slabs. The results indicate that the temperature difference between the slab surface and the core increases rapidly in the initial period and the maximum value of the temperature difference is close to the inflection point of the heating curve. After that, the internal temperature tends …
Effect Of Commutation Failures On Torsional Vibrations Of A Turbine Generator Nearby An Hvdc Link, Chi-Hshiung Lin
Effect Of Commutation Failures On Torsional Vibrations Of A Turbine Generator Nearby An Hvdc Link, Chi-Hshiung Lin
Journal of Marine Science and Technology
For an HVDC system, it is studied the torsional vibrations induced on the inverter side turbine generators due to a rectifier side ac faults. It is found there may be up to several times difference in the torsional torques induced at the turbine shafts and blades for the same fault, depending on the inverter commutation behavior. Further, if a single-phase-to-ground fault takes place with the commutation failure, it might cause a more serious impact on the turbine generator unit than a threephase-to-ground fault without commutation failure.
Melnikov Analysis Of A Ship's Stability With Water-On-Deck, Ying-Guang Wang
Melnikov Analysis Of A Ship's Stability With Water-On-Deck, Ying-Guang Wang
Journal of Marine Science and Technology
The nonlinear ship rolling motion with water-on-deck in regular beam waves is studied by utilizing a global geometric method. A ship stability criterion based upon the Melnikov function is obtained to provide an upper bound on the domain of the potential chaotic rolling motion. Phase plane diagrams and Poincare maps are used to validate the ship stability criterion obtained in this article.
Corner Effects In Deep Excavations-Establishment Of A Forecast Model For Taipei Basin T2 Zone, Chao-Hui Wu, Chang-Yu Ou, Ningchien Tung
Corner Effects In Deep Excavations-Establishment Of A Forecast Model For Taipei Basin T2 Zone, Chao-Hui Wu, Chang-Yu Ou, Ningchien Tung
Journal of Marine Science and Technology
This study attempts to establish a novel model for forecasting wall deformation and ground surface settlement of deep excavations. The model is developed by considering the corner effect and examining the data from relevant case histories. The study is specifically limited to the construction works in the T2 zone of the Taipei Basin. The following results were obtained: (1) The maximum wall deformation during each excavation step was approximately 0.2%-0.5% of the excavation depth, and was influenced by the corner effect. (2) The maximum ground surface settlement took place approximately at the center of the wall; and settlements at the …
Closed-Form Solutions Of Large Deflection For A Guyed Cantilever Column Pulled By An Inclination Cable, Jong-Dar Yau
Closed-Form Solutions Of Large Deflection For A Guyed Cantilever Column Pulled By An Inclination Cable, Jong-Dar Yau
Journal of Marine Science and Technology
Geometric non-linearity becomes an issue of great concern that cannot be overlooked in the analysis of cable-supported structures since their material properties may be in an elastic range but they exhibit nonlinear behavior when loaded. This study intends to present an analytical approach for analyzing the large deflection behavior of a guyed column pulled by a pre-tensioned cable at different stages of installation. The column is assumed to be naturally straight and inextensible, and each cable is modeled as an equivalent tensile bar neglecting the sag effect due to self-weight. Based on an elliptic integral formulation, closed-form solutions are derived …
An Effective Method In Bem For Potential Problems Of Thin Bodies, Yao-Ming Zhang, Yan Gu
An Effective Method In Bem For Potential Problems Of Thin Bodies, Yao-Ming Zhang, Yan Gu
Journal of Marine Science and Technology
The study of the effective methods dealing with problems with thin domains is an important and a difficult issue in boundary element method (BEM). For the special structures of thin bodies, the singular and nearly singular integrals often occur simultaneously in boundary integral equations (BIEs). Therefore, the conventional boundary element method (CBEM) is invalid to obtain accurate results. This paper based on the indirect variable regularized BIEs of plane potential problems, and a nonlinear variable transformation is introduced in order to improve the rapid variations of nearly singular integrals. By doing these, the boundary singular and nearly singular integrals can …