Volume 21,Issue 6,1998 Table of Contents

1 Research on the Minimum Number of Teeth of Double Involute Gear

1998, 21(6):1-6.

[Abstract](576) [HTML](0) [PDF 288.55 K](1269)

Abstract:
The minimum number of teeth of double involute gear to avoid undercutting is studied in transverse plane. The study is carried out by combining the pointing with the minimum number of teeth to avoid undercutting. In case of longer height coefficient or larger pressure angle than the common involute gear,it is pointed that the undercutting of root of the gear and pointing can be avoided at the same time for the double involute gear .

2 Queue Length in the Gated Service and Limited Service Polling Systems with Bernoulli Feedback

Sun Rongheng

1998, 21(6):7-12.

[Abstract](653) [HTML](0) [PDF 206.49 K](820)

Abstract:
In this paper,we consider the gated service polling system and the limited service polling system for non symmetrical stations with Bernoulli feedback,give the distributions and the first moments of queue lengths and some other results.

3 Application of the Fractal Theory in Modelling Decision Making Models for Manufacturing by Using the Experimental Data

Sun Dihua Liu Weining Liu Fei

1998, 21(6):13-17.

[Abstract](438) [HTML](0) [PDF 267.13 K](725)

Abstract:
Based on the fractal theory,the fractal dimension of the decision making mapping model for manufacturing by using the experimental data is studied.In modelling the decision making mapping of the intermittent cutting process,the approach for modelling mapping models by the fractal theory and the fractal dimension of the models are discussed.

4 The Finite Element Simulation of Pipe Bend Forming

Zhang Hua Zhang XiangWei Liao LinCan Ni Lin

1998, 21(6):23-28.

[Abstract](660) [HTML](0) [PDF 256.93 K](1379)

Abstract:
A dynamic explicit finite element method is used to pipe bend forming processes on bender in this paper.The degenerated shell element and co-rotational coordinate system are employed.The material of pipe is assumed to satisfy Hill's anisotropic elasto-plastic yield condition.The bend die and press die are assumed as rigid surfaces and the contact force is computed by penalty method.Several numerical examples are given.They show that this method is effective.

5 Study on Transport Equation and Numeric Simulation Equation of Gas Migration in Compressible Coal seam with Dual pore

Luo Xinrong

1998, 21(6):29-34.

[Abstract](468) [HTML](0) [PDF 255.26 K](845)

Abstract:
The transport equation and numeric simulation equation of gas migration in compressible coal seam with dual pore have been built up. The distribution curves of gas pressure in coal seam and the attenuation curves of coal or drilling hole wall have been obtained according to solution of numeric simulation and similar theory.

6 Computation of Scattering of Electromagnetic Waves from Absorbing Coating Using the Finite Difference Time Domain Method

Yu Jihui Tang Cuifeng Huang Jian

1998, 21(6):35-40.

[Abstract](518) [HTML](0) [PDF 258.08 K](758)

Abstract:
In this paper,we derive the necessary extension to the FD TD(finite difference time domain) method for absorbing coating of composite material.The scattering of electromagnetic waves(EW) from absorbing coating is considered,and the comparision of obtained results with exact analytic ones shows that the method used in this paper is correct and available.

7 Experimental Setup of Rotating Air bearing Table System for Active Vibration Control of Flexible Structure

Gu Yuan Chen Weimin Tang Jun Shi Rong Huang Shanglian

1998, 21(6):41-46.

[Abstract](667) [HTML](0) [PDF 294.96 K](1063)

Abstract:
In accordance with the present situation that there is a lack of deeper investigation of active vibration control of rigid flexible coupled structures with rotating rigid base,the significance of the buildup of experiment system is emphasized,and every component and its function of the experiment system is introduced in detail.The experimental setup has been finished so as to make rigid base rotate within some range at some different angular speed in the state of air bearing.

8 Study on the Travelling Wave Solutions of the KdV Burgers Equation

Zhang Xiaoqiang Tan Junyu

1998, 21(6):47-53.

[Abstract](769) [HTML](0) [PDF 246.00 K](88)

Abstract:
With the aid of the Lax Niouver transformation,the exact travelling wave solutions and the asymptotic travelling wave solutions of the KdV Burgers Equation are obtained.Furthermore,the series solutions are constructed with the Adomian integration.The relations of the travelling wave solutions between the KdV Burgers equation and the RLW Burgers equation are found.Moreover,a class of known exact solutions of the KdV Burgers equation are analysed.

9 Real Time Economic Load burdening Method of the Regulating Peak Load about the Boiler Units of Power Plant

Zhang Li Ran Jingyu Li Liangsheng Yang Lin

1998, 21(6):54-59.

[Abstract](499) [HTML](0) [PDF 121.51 K](207)

Abstract:
Basing on the combing the Equivalent Differential Increment Theory(EDIT) with the Equivalent Polyhedron Method(EPM),the optimum real time economical adjustment of regulating peak load for each boiler about power plant is presented. The results are applying in the site and the economical benefit is increased obviously. The method is simply,and cuts the time.

10 A Study on Kinetic Property of Acidulation Process of Waste Product of Iron Pyrite

Hou Changjun Huo Danqun

1998, 21(6):60-66.

[Abstract](569) [HTML](0) [PDF 252.25 K](130)

Abstract:
A kinetic property of acidulation process of waste product of iron pyrite is studied, kinetic data of acidulation process are measured.The chemical kinetic equation of the process is established on the result of experiment.The activation energy of the reaction is determined as 51.755 kJ/mol. The result of examination for kinetic model with F test showing : the reliability of reaction kinetic model is more than 99%.

11 Study on the Profile of Cold Rolling Sheet & Its Optimum Algorithm

Wang Linyun Luo Shaoming Zen Jun

1998, 21(6):67-72.

[Abstract](501) [HTML](0) [PDF 230.30 K](111)

Abstract:
The establishment of basic equation of good profile and its optimization algorithm are discussed in this paper.As an example,the optimization technique of cold rolling aluminium sheet is developed using good profile as the optimizing object.

12 Study on Strengthening and Toughening Mechanism of Nb V Bearing High Strength Steels

Yang Chunmei Hu Yisu Xin Yide

1998, 21(6):73-78.

[Abstract](555) [HTML](0) [PDF 314.71 K](116)

Abstract:
By using TEM,X diffraction and chemical analysis methods,the change of microstructure and properties of Nb V bearing microalloyed steels during different controlled rolling and controlled cooling.The results show that the fine mechanial properties are attributed to strengthening and toughening of ferrite grain refinement and precipitation strengthening of Nb(CN) and V(CN).

13 A Study on Flow Field with Swirling in Combustion Chamber

Wen Liangying Liu Chengquan Xu Chushao

1998, 21(6):79-82.

[Abstract](621) [HTML](0) [PDF 172.20 K](204)

Abstract:
采用ｒ－ｚ子午面与ｒ－θ横截面将三维湍流场进行分解，成功地完成了有旋流湍流场的数值计算。比较分析了直射流与有旋射流的燃烧室内流场的特征。

14 The Calculation of Transient Overvoltages on the Signal Cable Conductors Ocurring Equipment Faulting in Power System

Liu Yugen Chen Xianlu Huang Yong Liu Wei Li Yongxiang

1998, 21(6):83-89.

[Abstract](713) [HTML](0) [PDF 300.09 K](104)

Abstract:
This thesis studies circuit model for calculating transient overvoltages on the signal cable conduuctors,and the computational method and program of cable parameters.The transient overvoltages on the signal cable conductors ocurring equipment faulting in a 500 kV power system is calculated by EMTP.

15 Theoretical Analysis for the Performance of HVDC Grounds Electrodes and the Mathematical Modal

Wang Guanjie Li Bin Zhang Jinyu

1998, 21(6):90-94.

[Abstract](688) [HTML](0) [PDF 234.14 K](121)

Abstract:
The performance of HVDC ground electrodes is analyzed in detail.On the basis of electromagnetic field theories and its assumptions,the mathematical model is built,the ground resistance,the distribution of potential and temperature are computed with the current field distributions of HVDC ground electrodes.

16 The Design and its Implementation of a MultiMedia Course for Cast Iron Welding

Fu Yuechao Peng Gaoe Zhou Zhongyu Ling Zemin

1998, 21(6):95-99.

[Abstract](419) [HTML](0) [PDF 236.28 K](121)

Abstract:
How to develop a multimedia course for cast iron welding is discussed.The course is implemented with a multimedia application development software ToolBook 3.0.

17 A New Algorithm for Forward Neural Netwroks

Han Zhigang Zhang Anbang Yang Shizhong

1998, 21(6):100-103.

[Abstract](501) [HTML](0) [PDF 205.19 K](129)

Abstract:
利用矩阵Ｍｏｏｒｅ－Ｐｅｎｒｏｓｅ逆的方法，提出了一种新型的前馈多层神经网络学习算法－ＭＢＰ算法。该算法采用了群体搜索的策略，打破了ＢＰ算法一次一点的搜索方式，一次可搜索权空间中的一个超平面，仿真结果表明，该算法在提高收敛速度和避免陷入局部极小点方面都有一定的进展。

18 Asymmertical Wavlet Filter Banks for Image Compression

Zhu Binglian Cao Changxiu

1998, 21(6):104-110.

[Abstract](666) [HTML](0) [PDF 304.08 K](709)

Abstract:
构造了用于图象压缩的满足完全重构条件，具有线性相位的不等长小波滤波器组，即在小波分解时，其高通滤波器很短，而低通滤波器相对较长，这样，在滤波器等效总长度较短的前提下，获得了在基函数与实际波形较好地匹配。对比实验表明，所构造的滤波器性能不低于现有的滤波器，且由于滤波器总长度短，小波分解与重构所需的时间也比现有滤波器短。

19 The Chromatic Numbers of a Class of Circulants

Qu Xiaohong Yang Xiaofan Bai Sen

1998, 21(6):111-116.

[Abstract](731) [HTML](0) [PDF 224.20 K](825)

Abstract:
There are good symmetry in the circulants.Communication network topology is largely focused because of its value of application.The chromatic numbers of the circulants C n<1,k> are completely determined.

20 An Effective Parallel Algorithm for Assembling the Global Stiffness Matrix of Structures of Beam System

Lu Enlin Xiang Shiming

1998, 21(6):117-120.

[Abstract](636) [HTML](0) [PDF 185.76 K](992)

Abstract:
Based on uniform access and shared memory system,the conception of "balancing permutation" and corresponding methods for Do Loop parallelization are given in this paper.By combining element group and balancing permutation,and effective parallel algorithm for assembling the global stiffness matrix of structures of beam system is put forward.

21 The Macroeconomic Alarming Model

Yi Zhenjun

1998, 21(6):128-132.

[Abstract](718) [HTML](0) [PDF 242.00 K](899)

Abstract:
This paper has used X city economic development as background,the economic situations of economic systems in different periods have been classified into five economic models by economic mathematic method,then,we have established the boundary cognition functions for each economic model,which provides the direct quantitative limit for the economic alarming.

22 Infinitely Many Non collision Periodic Solutions for N Body Type Problems

Zhang Shiqing

1998, 21(6):133-138.

[Abstract](550) [HTML](0) [PDF 247.62 K](686)

Abstract:
证明了以下的Ｎ体型问题无穷多个非碰撞Ｔ－周期解的存在性；－ｕｉ＝Ｖｕｉ（ｕ，ｔ），其中ｕ＝（ｕ１，．．．，ｕＮ），ｕｉ∈Ｒ＾ｋ且Ｖ（ｕ，ｔ）＝Σ１≤ｉ≠ｊ≤ＮＶｉｊ（ｕｉ－ｕｊ，ｔ），势函数Ｖｉｊ（ζ）对ｔ是Ｔ－周期且在ζ＝０奇异但满足Ｇｏｒｄｏｎ的强力条件，证明基于Ｋ．Ｕｈｌｅｎｂｅｃｋ，丁伟岳及Ｐ．Ｍａｊｅｒ－Ｓ．Ｔｅｒｒａｃｉｎｉ的扰动方法的一个变形。

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