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- Adaptive beamformer (1)
- And upward spanning tree. (1)
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- Boundary condition (1)
- CNT composites (1)
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Articles 1 - 11 of 11
Full-Text Articles in Engineering
Design And Implementation Of Dstatcom For Fast Load Compensation Of Unbalanced Loads, Wei-Neng Chang, Kuan-Dih Yeh
Design And Implementation Of Dstatcom For Fast Load Compensation Of Unbalanced Loads, Wei-Neng Chang, Kuan-Dih Yeh
Journal of Marine Science and Technology
This paper proposes a distribution level static synchronous compensator (DSTATCOM) for fast load compensation of unbalanced loads in electric power distribution systems. For fast response requirement, a new feedforward compensation scheme is derived and employed in the paper. First, the compensation scheme of the DSTATCOM is derived with the symmetrical components method. Then, computer simulation with the program Matlab/Simulink preliminarily verifies the effectiveness of the proposed DSTATCOM. Accordingly, a hardware prototype is built with a floating-point DSP TMS320C6711-based system. Use of a current-regulated PWM (CRPWM) inverter as the power stage of the DSTATCOM generates needed compensation currents for real-time load …
Dsp-Based Implementation Of A Real-Time Doa Estimator For Underwater Acoustic Sources, Sheng-Yun Hou, Shun-Hsyung Chang, Hsien-Sen Hung, Jiang-Yao Chen
Dsp-Based Implementation Of A Real-Time Doa Estimator For Underwater Acoustic Sources, Sheng-Yun Hou, Shun-Hsyung Chang, Hsien-Sen Hung, Jiang-Yao Chen
Journal of Marine Science and Technology
Many direction-of-arrival (DOA) estimation algorithms for acoustic sources based on sensor array measurements have been well developed and verified via computer simulations and/or small-scale water trough experiments. However, these results are not in practical use because the testing scenarios may not reflect real underwater environments. In order to have a better understanding of DOA estimation in sea experiments, a prototype of DSP-based acoustic DOA estimator is designed and implemented. The prototype system is based on TMS320VC33 digital signal processor and is validated by both computer simulation and experiments performed on the shallow water of Bi-Sha fishery harbor located near the …
Spanning Trees For Binary Directed De Bruijn Networks And Their Applications To Load Balancing, Ming-Bo Lin, Ming-Hong Bai, Gene Eu Jan
Spanning Trees For Binary Directed De Bruijn Networks And Their Applications To Load Balancing, Ming-Bo Lin, Ming-Hong Bai, Gene Eu Jan
Journal of Marine Science and Technology
One of the major reasons of using parallel computer systems is that they have the potential for improving performance and resource sharing. To achieve this, an efficient way must be provided to broadcast a message or messages from a node to every other nodes in the system. However, the efficiency of transferring messages in a system is determined by the architecture of the underlying interconnection network of the system. In this paper, we consider the systems based on binary directed de Bruijn networks and define two shortest path spanning trees: the upward-0 spanning tree and the downward-0 spanning tree, to …
Simulation Of Cnt Composites Using Fast Multipole Bem, Zhen-Han Yao, Jun-Dong Xu, Hai-Tao Wang, Xiao-Ping Zheng
Simulation Of Cnt Composites Using Fast Multipole Bem, Zhen-Han Yao, Jun-Dong Xu, Hai-Tao Wang, Xiao-Ping Zheng
Journal of Marine Science and Technology
This paper addresses some applications of the fast multipole boundary element method on the simulation of CNT composites, including the simulation of elastic, thermal and electric properties. The carbon nanotubes are treated as effective elastic fibers for the simulation of elastic property, and treated as straight fibers with high thermal conductivity and high electric conductivity for the simulation of thermal and electric properties respectively. The numerical examples are compared with other numerical results and experimental data published in literature. To reduce the difference between numerical and experimental value of effective elastic modulus, two approaches with nonideal interfacial condition or additional …
A Modified Newton Method For Solving Non-Linear Algebraic Equations, Satya N. Atluri, Chein-Shan Liu, Chung-Lun Kuo
A Modified Newton Method For Solving Non-Linear Algebraic Equations, Satya N. Atluri, Chein-Shan Liu, Chung-Lun Kuo
Journal of Marine Science and Technology
The Newton algorithm based on the “continuation” method may be written as being governed by the equation xj(t) + Bij-1 Fi(xj) = 0, where Fi(xj) = 0, i, j = 1, …n are nonlinear algebraic equations (NAEs) to be solved, and Bij = ∂Fi /∂xj is the corresponding Jacobian matrix. It is known that the Newton's algorithm is quadratically convergent; however, it has some drawbacks, such as being sensitive to the initial guess of solution, and being expensive in the computation of the inverse of Bij at each iterative step. How to preserve the convergence speed, and to remove the …
Residual Vibrations Of Electrostatic Micro-Actuators With Novel Shaped Cantilevers, Ming-Hung Hsu
Residual Vibrations Of Electrostatic Micro-Actuators With Novel Shaped Cantilevers, Ming-Hung Hsu
Journal of Marine Science and Technology
This paper subjects electrostatic curved electrode actuators with novel shaped cantilevers to nonlinear dynamic analysis using the differential quadrature method. Numerical results are compared with experimental results to assess the efficiency and systematic procedure of this novel approach for nonlinear differential equations. The pull-in voltages computed for different structures correlate well with published data. Several characteristics of different combinations of shaped cantilevers and curved electrodes are also examined in this paper. Dynamic responses of actuators with novel shapes with several pull-in voltages are determined. The transitional responses for the derived systems are calculated using the Wilson-θ method.
Inductively/Capacitively Coupled Conductor-Backed Coplanar Waveguide Bandpass Filters Using Slow-Wave Stepped-Impedance Resonators, Jiunn-Jye Chang, Chih-Hong Sie
Inductively/Capacitively Coupled Conductor-Backed Coplanar Waveguide Bandpass Filters Using Slow-Wave Stepped-Impedance Resonators, Jiunn-Jye Chang, Chih-Hong Sie
Journal of Marine Science and Technology
In this paper, using the conductor-backed coplanar waveguides (CBCPWs) and the slow-wave stepped-impedance resonators, a second-order and a fourth-order inductively/capacitively coupled bandpass filters are designed, implemented, and measured. For second-order bandpass filter, two H-shaped defected ground structure (DGS) patterns are etched on the backside metallic ground planes of the input and output feedlines, it is found that two attenuation poles exist on both sides of the passband. When compared to the fourth-order bandpass filter without H-shaped DGS, the second-order bandpass filter with H-shaped DGS has compact size and comparable rolloff at the edges of the passband. In addition, the measured …
Vibration Analysis Of Pre-Twisted Beams Using The Spline Collocation Method, Ming-Hung Hsu
Vibration Analysis Of Pre-Twisted Beams Using The Spline Collocation Method, Ming-Hung Hsu
Journal of Marine Science and Technology
The variation in the accuracy of the calculated natural frequencies of pre-twisted beams solved with spline collocation method is investigated in this study. The spline collocation method is used to formulate the eigenvalue problems of pre-twisted beams. Three types of boundary conditions are considered. Numerical results indicate that the accuracy of the calculated natural frequencies is significantly dependent upon the pre-twisted angle of the non-uniform beam. Results that show that spline collocation method is very competitive for the vibration analysis of pre-twisted beams are presented.
Real Time Implementation Of Frost Beamformer For Underwater Communications, Hsien-Sen Hung, Shun-Hsyung Chang, Suan-Lin Chen, Chi-Wen Chang
Real Time Implementation Of Frost Beamformer For Underwater Communications, Hsien-Sen Hung, Shun-Hsyung Chang, Suan-Lin Chen, Chi-Wen Chang
Journal of Marine Science and Technology
In this paper, we investigate the performance of Frost’s linearly constrained minimum variance (LCMV) adaptive beamformer via computer simulations for QPSK signals transmitted over Rayleigh and Rician fading channels. Simulation results show that the Frost beamformer can still improve the signal-to-interference-plus-noise ratio, even over fading channels. For real-time underwater communications, a prototype system is implemented, which uses TMS320C40 digital signal processor chip for realization of the Frost beamformer. Through experiments in an acoustic trough the validity of the real-time Frost beamformer prototype system is verified, and the feasibility of its use in underwater communications is assessed.
Lmi Robustly Decentralized H Output Feedback Controller Design For Stochastic Large-Scale Uncertain Systems With Time-Delays, Wen-Ben Wu, Pang-Chia Chen, Min-Hsiung Hung, Koan-Yuh Chang, Wen-Jer Chang
Lmi Robustly Decentralized H Output Feedback Controller Design For Stochastic Large-Scale Uncertain Systems With Time-Delays, Wen-Ben Wu, Pang-Chia Chen, Min-Hsiung Hung, Koan-Yuh Chang, Wen-Jer Chang
Journal of Marine Science and Technology
The present paper investigates the problem of robustly decentralized H∞ output feedback controller design for a class of stochastic large-scale uncertain systems with time-delays. The considered time-delay parameters appear in the interconnections between individual subsystems and uncertainties are allowed to be unstructured but time-varying and norm-bounded. The sufficient conditions of the desired output feedback controller are based on the Lyapunov-Krasovskii stability theory and utilizing the decentralized scheme to be derived in terms of linear matrix inequalities (LMIs). The effectiveness of the proposed approach is illustrated by a numerical example.
Frsmc Design For The Steering Control And Diving Control Of Underwater Vehicles, Tzu-Chun Kuo, Ying-Jeh Huang, Hung-Hsiu Yu
Frsmc Design For The Steering Control And Diving Control Of Underwater Vehicles, Tzu-Chun Kuo, Ying-Jeh Huang, Hung-Hsiu Yu
Journal of Marine Science and Technology
A robust control method is proposed for the steering and diving control systems of autonomous underwater vehicles. Heading angle and heave position tracking are achieved. All the closed-loop poles in the sliding mode can be placed by using the sliding mode and root locus techniques. Fuzzy logic technique is further employed to effectively tune the control law. Parameter variation and external disturbance such as various vehicle speeds and the ocean current effect are overcome.