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Volume 20,Issue 4,1997 Table of Contents

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    • 1  Analysis of Effect on Performance of Network Compensating Technique by Processing of Signals in Time Domain
    Liu Guixiong Miu Xiue Zhong Xianxin
    1997, 20(4):21-24.
    [Abstract](619) [HTML](0) [PDF 179.66 K](123)
    Abstract:
    The effect on performance of network compensating technique by identifying and processing of signals is studied.And the error function caused by processing signals in time domain is derived,the method that can reduce errors is also proposed.
    2  The Singluar Direction Relate to Derivatives and Multiple Values of Meromorphic Function of Zero Order
    Lu Qian Zhang Xinming Gu Yongxing
    1997, 20(4):25-30.
    [Abstract](746) [HTML](0) [PDF 191.49 K](139)
    Abstract:
    应用Ｎｅｖａｎｌｉｎｎａ理论和Ａｈｌｆｏｒｓ－Ｓｈｉｍｉｚｕ特征函数理论，得到了满意条件的零级亚纯函数涉及导数与重值的奇异方向的存在性。
    3  Finite Element Analysis of Spatially curved Rods
    Xiong Hanwei Zhang Peiyuan
    1997, 20(4):31-36.
    [Abstract](676) [HTML](0) [PDF 194.96 K](1640)
    Abstract:
    A system of governing equations for spatially curved rods are derived in natural coordinate,and an analytic solution to the statically determinate problem is given.Based on the solution,a generalized displacement model for element of curved bars is developed,which is convergent and accurate.
    4  Parallel Algorithm of Structural Optimization Based on Space time Transform
    Xiang Shiming Lu Enlin
    1997, 20(4):37-43.
    [Abstract](522) [HTML](0) [PDF 319.29 K](884)
    Abstract:
    In this paper an attempt has been practised to introduce parallel techniques into the structural optimization.Based on space time transform five approaches for parallel computation of structural optimization have been presented.This paper has also pointed out the problems originated from large scale systems of structural optimization (LSSO) and put forward the technical line of design of LSSO.
    5  Investigation on the Properties of Aluminium Silicate Fiber Ceramic Matrix Composites
    Chen Bei Wei Xiwen Hu Xuejian
    1997, 20(4):48-53.
    [Abstract](580) [HTML](0) [PDF 267.59 K](1094)
    Abstract:
    研究了硅酸铝纤维加入量对陶瓷基复合材料强度和抗热震稳定性的影响。利用ｘ－ｒａｙｓ、电镜等实验手段对纤维的补强增韧机理和断裂机理作了理论探讨。
    6  The Analysis and Discussion on Criteria for Evaluating Thermodynamic Performance of Heat Exchanger
    Wu Shuangying Li Yourong
    1997, 20(4):54-59.
    [Abstract](726) [HTML](0) [PDF 281.30 K](777)
    Abstract:
    在分析和讨论常见的换热器热力学性能评价指标－－Ｙｏｎｇ效应η和无因次熵产数Ｎ。在实际应用时存在不足的基础上，引入了一个新的换热器热力学性能评价指标－－无因次熵产率（Ｙｏｎｇ损率）Ｎ，分析了讨论的结果表明，该指标不仅物理意义明确，而且适用范围更广，在换热器的热力学评价时优于Ｙｏｎｇ效率η和无因次熵产数Ｎ。
    7  An Exchange Algorithm for the Best Chebyshev Normal Approximation by Quadratic Curves
    Gong Qu
    1997, 20(4):60-63.
    [Abstract](487) [HTML](0) [PDF 168.21 K](819)
    Abstract:
    According to the criterion of measuring profile error,a mathematical model for the best approximation to profile of gear is presented;the characteristic of the best quadratic curve approximation is derived.An algorithm and its convergence are discussed.Finally,the quadratic curve approximations to the profiles of many gears are obtained efficiently by the algorithm.The approximation errors are less than 0.8 micrometers.
    8  A Study of the Absorption and Emission Spectra and the Thermal Conversion Mechanism of F B(Na +) Defect in KF
    Kong Chunyang Wen Zhiyu Xiang Yongshou
    1997, 20(4):64-69.
    [Abstract](572) [HTML](0) [PDF 266.89 K](787)
    Abstract:
    On the basis of the single electron Hartree Fock approximation and the SLC extendedion method we presen the model of dipole of excited state,and calculate the absorption and emission spectra of F B(Na +) in KF.The possible mechanism of the strong stockes shifted emission and the thermal conversion phenomenon of excited states have been studied.
    9  A Comprehensive Evaluation Method for Uniformly Distributed Random Numbers
    Cai Kunbao Feng Mingzhi Yang Zeling Li Shengcai Ma Dengji
    1997, 20(4):70-75.
    [Abstract](644) [HTML](0) [PDF 249.58 K](1209)
    Abstract:
    Mathematical methods for generating uniformly distributed U(0,1) random numbers are described.A comprehensive evaluation method for uniformly distributed random numbers is presented.This method is used to evaluate the randomness of uniformly distributed random sequences generated by software.Some good seeds have been selected out that can be used to generate uniformly distributed random sequences with better performance.
    10  Optimal Control System for UPFC
    Luo Chunlei Sun Hongbo Xu Guoyu
    1997, 20(4):76-80.
    [Abstract](591) [HTML](0) [PDF 216.62 K](1154)
    Abstract:
    This paper first analyzes the internal dynamic process of the UPFC,then a five order differential equation is presented to describe dynamic behavior of UPFC. In term of this,a optimal control system is designed.Dynamic simulation of a transmission system demonstrates the effectiveness.
    11  Removing White Noises from Fault Signals of Motors with Dyadic Wavelets
    Yang Hua Wang Yuhong Ren Zhen
    1997, 20(4):81-86.
    [Abstract](667) [HTML](0) [PDF 249.58 K](629)
    Abstract:
    The properties of fault signals of motors are studied using dyadic wavelets transform in this paper,which can be treated as signals with sigularities.The method of removing white noises is presented by using the difference between the wavelets transforms of white noises and those of fault signals of motors in this paper."Denoised" signals can be reconstructed by using this practical algorithm.
    12  An Algorithm of Fitting Operation in Solid Moulding System
    Guo Yun Li Jianshu Zhong Xianxing
    1997, 20(4):87-91.
    [Abstract](504) [HTML](0) [PDF 175.61 K](86)
    Abstract:
    This paper propose a quick and simple fitting operation which is a efficient algorithm for two primitives with against face or same central line.
    13  The Influence of Adjustable Parameter on Tripping of Main Motor During Piercing
    Zhang Caian
    1997, 20(4):92-95.
    [Abstract](512) [HTML](0) [PDF 177.39 K](95)
    Abstract:
    研究了穿孔调整参数对穿孔机主电机跳闸的影响，适当减少管坯总直径压缩率和增大穿孔椭圆度系数，提高管坯加热质量，加热温度和增大主电机容量，都能有效地减少主电机跳闸。
    14  Separation and Analysis of the Ferroferric Compounds from Different Valence States in Lubricating Oil
    Zeng Linggao Tang Jianlin Xu Mingxi Wei Yunlong
    1997, 20(4):96-102.
    [Abstract](545) [HTML](0) [PDF 316.99 K](158)
    Abstract:
    The separation and analysis methods of ferroferric compounds in lubricating oil during mechanical transmission friction process are discussed in this paper.Owing to the iron and iron ion entered in lubricating oil yielding the wear and erosion of iron base alloy material.The separation of small wearing particles in lubricating oil and the measurement of iron are studied especially.The reliability of these methods are also verified and judged.
    15  Strength design of Traction Drives and Selection for Oil Type
    Wang Haiyun He Xiaobai
    1997, 20(4):103-107.
    [Abstract](546) [HTML](0) [PDF 221.25 K](91)
    Abstract:
    介绍了牵引传动的三要素－输入载荷的运动表面；传动介质及输出载荷的运动表面的设计理论及方法。
    16  The Particle Size Measurement Method of Particles in Brownian Motion
    He Zhengjiang Yang GuanlingChen Wei Xie Lili Guo Yongcai
    1997, 20(4):108-113.
    [Abstract](634) [HTML](0) [PDF 127.56 K](280)
    Abstract:
    介绍了基于颗粒布朗运动信号测定颗粒粒度的理论依据和方法；颗粒位置信息法和颗粒速度信息法。
    17  Effects of chemical Composition and Hot Rolling Process on Microstructure and Mechanical Properties of 15MnV Steels
    Feng Guangchun
    1997, 20(4):114-118.
    [Abstract](512) [HTML](0) [PDF 237.75 K](121)
    Abstract:
    In this paper,effects of chemical composition and hot rolling process on microstruture and mechanical properties of 15 MnV steels have been investigated in laboratory.The results show that,if only composition and hot rolling process are controlled suitablly,reducing manganese content of steels by 1.2% is possible.The suitable composition and hot rolling process compatible with that 15 MnV steels after reducing manganese content still meet specified demanl for mechanical properties are arrived.
    18  A Method to Eliminate the Boundary Distortion in Subband Analysis / Synthesis
    Zhu Binglian Cao Changxiu Chen Dongyi
    1997, 20(4):119-124.
    [Abstract](515) [HTML](0) [PDF 230.30 K](75)
    Abstract:
    This paper analyses the principle of analysis/synthesis in subband coding and the cause of the boundary distortion,and presents a method using the Hadamard transform as a analysis/synthesis system to eliminate the boundary distortion completely.

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