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Articles 1 - 10 of 10
Full-Text Articles in Engineering
On Parametric Pole-Placement For A Class Of Linear Systems, Jeng Yih Juang
On Parametric Pole-Placement For A Class Of Linear Systems, Jeng Yih Juang
Journal of Marine Science and Technology
This paper presents an innovative approach for parametrizing a class of state-feedback pole-placement controllers through the minimum number of effective free parameters. The approach is based on the theory of hypothetical loop-decoupling. Linear and nonlinear functions of parameter coupling in the feedback gain matrices are disclosed to the problem of generic parametric poleplacement for a linear time-invariant controllable system. With the class depicted by the controllability indices for the hypothetical control loops, parametrization for state-feedback design can be achieved. The flexibility in loop pole-assignment for a multi-input system also affects the choice for the gain matrix. The excellence of the …
The Application Of Wavelet-Based Least Mean Square Algorithm In Adaptive Beamforming, Shun-Hsyung Chang, Chin-Chang Chang
The Application Of Wavelet-Based Least Mean Square Algorithm In Adaptive Beamforming, Shun-Hsyung Chang, Chin-Chang Chang
Journal of Marine Science and Technology
Wavelet transform is one of methods that utilizes the dilation and contraction of prototype wavelet basis function to form a set of fully flexible windows in the time-frequency plane. It exhibits a good effect in both the analysis of high and low frequency components of signal. By applying such a transform method to traditional least-mean-square algorithm (LMS), we can obtain an orthogonally transformed signal from a time-domain input signal after imposing wavelet transform on it. In addition, we can improve the convergence speed of learning curve by passing the transformed signal through weight which is adapted with LMS. The improved …
Application Of Decomposition Technique To Linear Wave Model Identification, Ching-Yaw Tzeng
Application Of Decomposition Technique To Linear Wave Model Identification, Ching-Yaw Tzeng
Journal of Marine Science and Technology
A decomposition technique is employed in identifying the coefficients of a Fourier series-based linear wave model. Two decomposed subproblems are formulated, one in the frequency domain and one in the direction domain. Less computation time is required when solving the two subproblems sequentially, compare to solving the original problem directly. A stretched method that takes the instantaneous free surface as the reference position in computing the water particle velocities achieves better agreement with the experimental data than the standard linear approach where the reference position is taken at the mean water level.
The Effect Of Aggregate Volume Ratio On The Elastic Modulus And Compressive Strength Of Lightweight Concrete, Chung-Chia Yang, Yung-Shin Yang, Ran Huang
The Effect Of Aggregate Volume Ratio On The Elastic Modulus And Compressive Strength Of Lightweight Concrete, Chung-Chia Yang, Yung-Shin Yang, Ran Huang
Journal of Marine Science and Technology
In order to investigate the effect of aggregate volume ratio (S/A, volume of sand/ volume of total aggregate) on the elastic modulus of lightweight concrete, cylindrical specimens ( 010x200mm) with different S/A ratios and various water-cement ratios were cast and tested. Both single inclusion model and double inclusion model were applied to predict the elastic moduli of two-phase and three-phase cement-based composite materials, respectively. The elastic modulus of lightweight aggregate was obtained based on composite theory models. In this study, the aggregate volume ratio significantly affects the elastic properties of lightweight concrete. The elastic modulus and compressive strength of lightweight …
On The Rigid-Ideally Plastic Deformation Of Cantilever Bean Subjected To Tip Impact, Ming-Te Liang, Bon-Jofei Lee, Sen-Shyang Yang
On The Rigid-Ideally Plastic Deformation Of Cantilever Bean Subjected To Tip Impact, Ming-Te Liang, Bon-Jofei Lee, Sen-Shyang Yang
Journal of Marine Science and Technology
This paper presents to study the resemblance and discrepancy between the rigid-plastic and elastic-plastic deformation of cantilever beams subjected to tip impact. For this, the theory of Ting's analysis [3] and calculation parameter obtained from Parkes [1] and Symonds and Fleming [4] are used for numerical computation. These results obtained from rigid-plastic deformation are compared with those results calculated by Reid and Gui [8] who used the non-linear finite-clement code ABAQUS for presenting the numerical solution of the elastic-plastic deformation of cantilever beams. No matter what rigid-plastic or elastic-plastic deformation, the kink phenomena of the plastic hinge arrest mechanism is …
Optimum Spacings Of Longitudinal Convective Fin Arrays, Rong-Hua Yeh, Shih-Pin Liaw, Ming Chang
Optimum Spacings Of Longitudinal Convective Fin Arrays, Rong-Hua Yeh, Shih-Pin Liaw, Ming Chang
Journal of Marine Science and Technology
This paper deals with the optimum spacings of longitudinal fin arrays in forced convection theoretically. Four different fins in arrays such as rectangular, convex-parabolic, triangular, and concave-parabolic fins are taken into consideration in the analysis. The aspect ratio, interfin spacing, and heat transfer characteristics of the optimized fin arrays are investigated with given geometry of base plate, total fin volume, and transverse Biot number. A comparison in the total heat duties and overall surface efficiencies of the four different arrays is also made. All the results are presented in dimensionless forms for the convenience of parametric study and design analysis.
Analysis Of Design Wind Speed Distribution Of Taiwan Area, Jing-Jong Jang, Jeng-Ru Lee
Analysis Of Design Wind Speed Distribution Of Taiwan Area, Jing-Jong Jang, Jeng-Ru Lee
Journal of Marine Science and Technology
This paper thoroughly examines the basic design wind speed according to wind loading of building codes in Taiwan. The first part of this study contains Chi-Square test and K-S (Kolmogorov Smirnov) test on four common wind speed probability distribution models. The data to be tested are sampled from the annual maximum 10-minute average wind speed recorded by 25 weather stations of Taiwan Central Weather Bureau during the period from 1951 to 1990. The Type I Extreme Value model is determined and recommended as the best wind speed probability distribution model for Taiwan area. This paper then explores the probability of …
An Experimental Study On Solidification Of Pure Water Or A Dilute Salt Solution In A Horizontal Copper Tube, Hwa-Chong Tien, Sih-Li Chen, Bing-Shiang Yang
An Experimental Study On Solidification Of Pure Water Or A Dilute Salt Solution In A Horizontal Copper Tube, Hwa-Chong Tien, Sih-Li Chen, Bing-Shiang Yang
Journal of Marine Science and Technology
Solidification of pure water and NaCl-HO solutions in a copper tube is investigated experimentally. The morphology and growth of the two phase region is observed photographically, In the experiments of NaCl-H2O solutions, the salt concentrations in the solutions are smaller than the concentration at the eutectic point. The coolant temperature is higher than the eutectic temperature. The supercooling phenomenon and the effects of the coolant temperature, initial temperature of water or NaCl-HzO solution, and the concentrations of the solutions are studied in detail. In addition to the photographs, results presented also nclude the temperature responses of water and NaCl-H2O solutions …
Constrained Dynamic Controller Design For Ship Steering Yaw-Control, Wen-Jer Chang
Constrained Dynamic Controller Design For Ship Steering Yaw-Control, Wen-Jer Chang
Journal of Marine Science and Technology
Multiple constrained dynamic controller design problems associated with steering of ship yaw motion are discussed in this paper. The multiple constraints considered here contain individual state variance constraints, robust performance (H.. norm) constraints and regional pole assignment (D-stability) constraints. The necessary and sufficient conditions for the existence of the constrained dynamic controller, which achieves the above three constraints, will be derived. Under achieving these conditions, the dynamic controllers will be solved by using the well known singular value decomposition (SVD) techniques and the theory of generalized inverses. Finally, a numerical simulation is given to show the usefulness and applicability of …
Computerized Shortest Path Searching For Vessels, Gene Eu Jan, Ming-Bo Lin, Yung-Yuan Chen
Computerized Shortest Path Searching For Vessels, Gene Eu Jan, Ming-Bo Lin, Yung-Yuan Chen
Journal of Marine Science and Technology
The solution of "computerized shortest path searching for vessels" is presented in the paper. In the core of the method, the shortest path algorithm on the raster plane with O(N?) time was applied with dedicated database structure and searching rules. Furthermore, we can extend the method to the optimal path searching for Search and Rescue (SAR) and Vessel Traffic Management System (VTMS) by modifying the database and searching rules.