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Articles 1 - 10 of 10
Full-Text Articles in Engineering
The Estimation Of Direction-Of-Arrivals Of Wideb And Sources By Signal Subspace Focusing Approach, Lena Chang, Chung-Fan Twu
The Estimation Of Direction-Of-Arrivals Of Wideb And Sources By Signal Subspace Focusing Approach, Lena Chang, Chung-Fan Twu
Journal of Marine Science and Technology
A novel signal subspace focusing (SSF) approach for the wideband array processing is proposed in this paper. The method is based on the transformation of the signal subspaces by using focusing matrices. The focusing matrix is designed to align the signal subspaces for different frequencies in the bandwidth of the sources, and is constructed without the preliminary angle estimation. Hence, the SSF can avoid the inherent sensitivity to focusing error. Simulation results validate the effectiveness of the SSF in the estimation of the direction-of-arrivals (DOAs) of wideband sources.
Complete Solution Of The Five-Position Synthesis For Spherical Four-Bar Mechanisms, Chen-Chou Lin
Complete Solution Of The Five-Position Synthesis For Spherical Four-Bar Mechanisms, Chen-Chou Lin
Journal of Marine Science and Technology
The objective of this paper is to synthesis spherical four-bar motion and path generators using continuation method (homotopy method). Using continuation method, we may obtain a complete set of the solutions to the problems, and provide mechanism designers with all possible choices which meet the kinematic specifications. In contrast to other local numerical schemes such as Newton method and Powell method which are sensitive to initial guess, continuation method is a global convergence method that guarantee to find all solutions to the equations. In this paper, the problems with four and five precision points will be formulated, solved, and compared …
Analysis Of The Pivot Point For A Turning Ship, Ching-Yaw Tzeng
Analysis Of The Pivot Point For A Turning Ship, Ching-Yaw Tzeng
Journal of Marine Science and Technology
An approximate method based on the steady state linearized sway-yaw equations is proposed to estimate the pivot point of a turning ship. The location of the pivot point is directly related to the ratio of the "sway-rudder" and "yaw-rudder" gain coefficients. which can be readily computed from six linear hydrodynamic coefficients. Hence, estimation of the pivot point for a ship at the design stage is made possible with minimum hydrodynamic coefficients information required. Numerical results indicate that based on the proposed method, the estimated pivot point position for a turning ship correlates well with the solution obtained from a full …
Investigation Of Longitudinal Elastic Wave At Right-Angle Joint Of Two Rods, Ming-Te Liang, Chiou-Jenn Chen
Investigation Of Longitudinal Elastic Wave At Right-Angle Joint Of Two Rods, Ming-Te Liang, Chiou-Jenn Chen
Journal of Marine Science and Technology
The right-angle welded joint is usefully and frequently used in the welded type for the steel structures. The present study is focused on the longitudinal elastic waves propagating through the right-angle welded joint of two rods. One uses the theory and numerical calculation to identify the consequence of the problems of reflection and transmission. The present study indicates that the incident longitudinal elastic waves are almost reflected in the horizontal rod while the values of 3% of the generated pulse are transmitted in the vertical rod.
A Study Of Along Wind Speed Power Spectrum For Taiwan Area, Jing-Jong Jang, Yu-Lin Lee
A Study Of Along Wind Speed Power Spectrum For Taiwan Area, Jing-Jong Jang, Yu-Lin Lee
Journal of Marine Science and Technology
The Purpose of this paper is to formulate the wind speed power spectrum by time history data of strong wind speed in Taiwan area. By utilizing random vibration theory and statistical regression analysis, a systematic analysis and discussions of along wind turbulence effects for wind speed power spectrum is performed. This study includes the time history data collection of along wind speed for typhoon in Taiwan and the regression analysis of wind speed spectral formulas. The strong wind speed data was first transformed from time domain to frequency domain. Then, the statistical analysis methods were applied for spectrum formulation and …
Near-Field Source Localization Using Music With Polynomial Rooting, Hsien-Sen Hung, Shun-Hsyung Chang, Chien-Hsing Wu
Near-Field Source Localization Using Music With Polynomial Rooting, Hsien-Sen Hung, Shun-Hsyung Chang, Chien-Hsing Wu
Journal of Marine Science and Technology
In this paper, the bearing, elevation, and range estimation of near-field narrow-band sources from data observed across an array of sensors is considered. For high-resolution source localization, the multiple signal classification (MUSIC) algorithm is modified and extended to its 3-D version by accounting for spherical curvature and spreading factor in the array manifold. However, the simultaneous estimation of bearing, elevation, and range from 3-D MUSIC spectrum requires exhaustive multidimensional search. As to alleviate computational load, an alternative algorithm is proposed. The proposed algorithm involves search in the range domain combined with polynomial rooting, which replaces the search in the azimuth-elevation …
A Unified Approach For The Robust Spr Property Of A Parametric Uncertainty System, Chih-Yung Cheng, Chao-Fong Chang
A Unified Approach For The Robust Spr Property Of A Parametric Uncertainty System, Chih-Yung Cheng, Chao-Fong Chang
Journal of Marine Science and Technology
In this paper, we adopt a unified approach based on the concept of value set to analyze the robust strict positive real (SPR) property of uncertain systems with interval, affine linear or multilinear uncertainty structures.
Robust Multiple Constrained State Feedback Controller Design With Minimum Auxiliary Entropy For Linear Discrete Systems, Wen-Jer Chang
Robust Multiple Constrained State Feedback Controller Design With Minimum Auxiliary Entropy For Linear Discrete Systems, Wen-Jer Chang
Journal of Marine Science and Technology
Existence of a state feedback controller with minimized auxiliary entropy design problem will be explained in this paper. This state feedback controller will achieve multiple performance constraints for linear discrete systems. These constraints include individual state variance constraints. H.. norm constraints and regional pole assignment constraints. By achieving the previous three requirements, the state feedback controller can then be solved through use of the singular value decomposition (SVD) techniques and the theory of generalized inverses. An example will be provided to demonstrate the effectiveness of the present methodology.
Frequency Selection Of Wake Flow Behind A Naca 0012 Wing, Han-Wen Lee, Rong-Fung Huang
Frequency Selection Of Wake Flow Behind A Naca 0012 Wing, Han-Wen Lee, Rong-Fung Huang
Journal of Marine Science and Technology
The oscillating flow modes, frequency selection, and response of periodic frequency to change of characteristic flow modes behind a NACA 0012 wing model are studied experimentally. The functional relationships of the dominant mechanisms in limiting ranges of Reynolds number are justified analytically. The oscillating instabilities in wake region possess four characteristic modes: laminar, subcritical, transitional, and supercritical. In viscous effect dominated regime of laminar mode, Strouhal number is inversely proportional to Reynolds number. In inertial effect or pressure gradient dominated regime of supercritical mode, Strouhal remains constant. In regime between limiting cases, Strouhal number increases nonlinearly with Reynolds number and …
Routing And Broadcasting Algorithms For The Root-Folded Petersen Etworks, Ming-Bo Lin, Grene-Eu Jan
Routing And Broadcasting Algorithms For The Root-Folded Petersen Etworks, Ming-Bo Lin, Grene-Eu Jan
Journal of Marine Science and Technology
Petersen networks have been proposed as the alternatives for interconnecting highly parallel computers. The main advantages of Petersen networks are: regular topology, high scalability, and smaller diameters. In this paper, we propose a new node naming scheme for Petersen networks. Based on this scheme, two Petersen graph related networks, called root-folded Petersen network in type-I and type-II, are constructed. Furthermore, both O(1ogio N) routing and broadcasting algorithms for the proposed networks are developed, where N is the number of nodes.