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, Volume 6 Issue 2
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Controllable high repetition rate gain-switched Nd:YVO4 microchip laser
SHENG Fang, CHEN Jun, GE Jian-hong
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 1-.
https://doi.org/10.1631/jzus.2005.A0079
Abstract
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We demonstrated a monolithic, compact, diode-pumped gain-switched Nd:YVO4 laser at 1.064 |ìm wavelength with controllable repetition rate of 1 Hz to 25 kHz. Stable gain-switched pulse train with maximum repetition rate of 25 kHz and pulse width of 16 ns was obtained
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Influence of DSP controller on performance of a permanent magnet brushless AC drive in flux-weakening mode
ZHU Z.Q., SHI Y.F., HOWE D.
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 2-.
https://doi.org/10.1631/jzus.2005.A0083
Abstract
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The flux-weakening performance of a permanent magnet brushless AC drive was investigated using both floating-point and fixed-point DSP controllers. A significant current oscillation was observed when the drive was operated at high-speed in the flux-weakening mode with the fixed-point DSP. The investigation showed that this was due to the on-line compensation of the winding resistance voltage drop and quantisation errors associated with the fixed-point architecture of the DSP. A simple look-up table scheme is proposed to eliminate the oscillation and to achieve extended flux-weakening capability.
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Interface waves between two piezoelectric half-spaces with a semiconductor film
YANG Jia-shi, ZHOU Hong-gang
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 3-.
https://doi.org/10.1631/jzus.2005.A0090
Abstract
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In this work propagation of anti-plane (SH) waves in two piezoelectric ceramic half-spaces with a thin layer of a semiconducting material between the half-spaces is studied, and wave attenuation and dispersion caused by semiconduction as well as wave amplification by a biasing electric field are examined
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Simulating the dynamics of fluid-cylinder interactions
PAN Tsorng-Whay, GLOWINSKI Roland, JOSEPH Daniel D.
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 4-.
https://doi.org/10.1631/jzus.2005.A0097
Abstract
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We present the simulation of the dynamics of fluid-cylinder interactions in a narrow three-dimensional channel filled with a Newtonian fluid, using a Lagrange multiplier based fictitious domain methodology combined with a finite element method and an operator splitting technique. As expected, a settling truncated cylinder turns its broadside perpendicular to the main stream direction and the center of mass moves to the central axis of the channel. In the case of two truncated cylinders, they first move around each other for a while and then stay together in a ?°T?± shape. After the ?°T?± shape has been formed for a long enough time, we found no vortex shedding behind the cylinders. When simulating the fluidization of 60 truncated cylinders, we captured the features of interactions among fluidized cylinders as observed in experiments
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Navigation system for a smart wheelchair
BONCI Andrea, LONGHI Sauro, MONTERIÙ Andrea, VACCARINI Massimo
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 5-.
https://doi.org/10.1631/jzus.2005.A0110
Abstract
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Recent results on the development of a navigation system for a smart wheelchair are presented in this paper. In order to reduce the development cost, a modular solution is designed by using commercial and low cost devices. The functionalities of the tracking control system are described. Experimental results of the proposed assistive system are also presented and discussed.
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PipeCF: a DHT-based Collaborative Filtering recommendation system
SHEN Rui-min, YANG Fan, HAN Peng, XIE Bo
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 6-.
https://doi.org/10.1631/jzus.2005.A0118
Abstract
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Collaborative Filtering (CF) technique has proved to be one of the most successful techniques in recommendation systems in recent years. However, traditional centralized CF system has suffered from its limited scalability as calculation com-plexity increa
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Analysis modeling for plate buckling load of vibration test
SUNG Wen-pei, LIN Cheng-I, SHIH Ming-hsiang, GO Cheer-germ
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 8-.
https://doi.org/10.1631/jzus.2005.A0132
Abstract
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In view of the recent technological development, the pursuit of safe high-precision structural designs has been the goal of most structural designers. To bridge the gap between the construction theories and the actual construction techniques, safety facto
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A meshfree method and its applications to elasto-plastic problems
ZHANG Ji-fa, ZHANG Wen-pu, ZHENG Yao
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)
, 2005, 6( 2): 10-.
https://doi.org/10.1631/jzus.2005.A0148
Abstract
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Standard finite element approaches are still ineffective in handling extreme material deformation, such as cases of large deformations and moving discontinuities due to severe mesh distortion. Among meshfree methods developed to overcome the ineffectiveness, Reproducing Kernel Particle Method (RKPM) has demonstrated its great suitability for structural analysis. This paper presents applications of RKPM in elasto-plastic problems after a review of meshfree methods and an introduction to RKPM. A slope stability problem in geotechnical engineering is analyzed as an illustrative case. The corresponding numerical simulations are carried out on an SGI Onyx3900 supercomputer. Comparison of the RKPM and the FEM under identical conditions showed that the RKPM is more suitable for problems where there exists extremely large strain such as in the case of slope sliding.
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