Volume 19,Issue 2,1996 Table of Contents

1 The Numerical Simulation of Casting Process for Making Metal Matrix Composites

Tang Dapei , Gao Zhihui , Fan Jinghong

1996, 19(2):10-16.

[Abstract](726) [HTML](0) [PDF 287.88 K](122)

Abstract:
In this paper,a numerical simulation of the casting process for making the MMC.using the PEM, is studied.The convection of liquid metal and the release of latent heat of solidification are taken into account.The algorithm and program for axisymmetric casting model are developed to the problem of coupling between flow and heat transfer,as well as phase change.The variational curves of temperature,the position of flow front and the distrsbutions of volume fraction of solid metal in matrix and their variation with time are obtained.The influences of technological paarmeters to casting are discussed.

2 Three Dimensional Eddy-current Field computation by Edge Finite Element Method of Mixed Elements

Rao Mingzhong , Huangjian , WangQuandi , Tan Banging

1996, 19(2):23-29.

[Abstract](833) [HTML](0) [PDF 252.00 K](154)

Abstract:
The edge finite element interpolation function of 1-forms for prism is derived.The electrical field intensity is used as the unknown variable.If the tangential component of electrical field intensity is an enforcing condition on the interface of eddy-current region and non-eddycurrent region,the tangential component of magnetic field intensity is a natural continuous condition.At last,the mixed elements of prism and hexahedron are used to compute a three dimensional eddy-current problem.

3 Experiment of Two-phase Flow Patterns and Analysis of Flow Map During Condesation inside Horizontal Two Dimensional Internal Microfin Tubes

Du Yang , Xin Mingdao

1996, 19(2):41-47.

[Abstract](355) [HTML](0) [PDF 296.27 K](990)

Abstract:
通过实验研究，从工程应用角度和流型转变控制机理考虑，将水平二维内微肋管内的凝流型分为三区即：环状流，分层流与间歇流。通过解析法得到流型转变的判据和流型图。与作者所做实验数据吻合。

Yang Qingwen , Liao Zhengfang , Qin Wenxue

1996, 19(2):48-50.

[Abstract](540) [HTML](0) [PDF 132.34 K](726)

Abstract:
The cutting property is studied with the grey theory and method for the premixed abrasive water jet.The relationship between the primary and secondary is obtained about the cutting specific energy influenced by pressure,the standoff distance,the abrasive concentration and transverse velocity.The guidance is provided for further research and pratical application.

5 Study on Functional Testing State Sets for 32-bit Microprocessors

Cao Zehan , Li Lixin , Liu Chaogang

1996, 19(2):56-60.

[Abstract](592) [HTML](0) [PDF 237.55 K](863)

Abstract:
Based on the functional fault model of instruction decoding in microprocessors,this paper Slyes the properties of the tasting state set should have for any type of instructions and presents the method to construct such testing state sets.

6 Solving the Operation Directing Expert Systems Based on Characteristic Model

Huans Xiyue , Chai Yi , Deng Renming , Shi Weiren , Bal Liang

1996, 19(2):61-66.

[Abstract](366) [HTML](0) [PDF 267.43 K](593)

Abstract:
In this thesis,aiming at the characteristic of operation directing expert systems,we use the state of process characteristic parameter to describe the process condition(state).We propose a solving strategy batal on characteristic model.According to the solving-tree of process condition (state),the present process state can be obtained. An example of application illustrates that this method solves problem quickly and satisfy the real time directing operation.

7 Practical Criterion for Voltage Stability of Substation

Zhou Niancheng , Zhong Mingxiu , Xu Guoyu

1996, 19(2):73-77.

[Abstract](526) [HTML](0) [PDF 249.08 K](1181)

Abstract:
This paper presents a new practical criterion for voltage stability based on the real-time information at the substation and the quasi-time information from power system.By using the criterion,it is effective to predict the bus voltage stability margin.This is of great importance to raise the security operation level and prevent voltage collapse.The practical criterion for voltage stability is tested on the IEEE-14-bus test system.It needs less calculation time and is very suitable for real-time control of power systems.

8 A Study on the Mathematical Models for Two Dimensional Guillotine Cullting-stock

Cai Zhengjun , Gong Jian , Liu Fei

1996, 19(2):82-88.

[Abstract](793) [HTML](0) [PDF 283.55 K](1268)

Abstract:
Based on the analysis and study on some existed models for two-dimensional Guillotine Cutting-Stock problem, it is pointed out that some kinds of the models may miss some good cutting patterns,and some may result in inadequate solutions because of only considering the patterns with the smallest waste. A kind of revised two-dimensional cutting-stock models are developed,which transform the two-dimensional problem into the one-dimensional one using the dimension-decreasing heuristic method and whose initial patterns are considered comprehensively. In this kind of models, not only the least waste,but also the other constraints,such as the demands and the relative area of the order plates are considered.

9 The Prediction of Danger Zone of Coal Burst

Yin GuangZhi , Xian Xuefu , Zhang Zhiqiang , Jin Liping Bai Yunbiso

1996, 19(2):89-94.

[Abstract](717) [HTML](0) [PDF 236.28 K](725)

Abstract:
The measurement of in-site crustal stresses are carried out in Yan Shi Tai coal mine.The outburst-proneness of 6# coal seam are studied with five indexes. Based on the strength testing of coal,the strength criterion is set up. The energy criterion is put forward in the light of engineering practice.According to the "three criteria" mechanical model,the prediction of danger zone of coal burst of 6# coal seam in this mine is carried out.

10 The Research on Pretreatment and Cycle Stream of Control for CAT and CNC

Peng Donglin

1996, 19(2):95-98.

[Abstract](583) [HTML](0) [PDF 242.09 K](89)

Abstract:
A new idea "Pretreatment and cycle stream of control" and the scheme to put it into practice is presented. In space region,the circuit is designed to form chain and cycle,and in time region,the program is designed to distinguish the period and the instant.It is ensured that the pretreatment will be finished in the period and there is always a circuit to wait to the triggered at the instant. So the respond speed of the system is almost approximate to that one of trigger circuit.

11 Dynamical Idnetification for Blast Furnace Condition

Gao Xiaoqiang , Zheng Zhong , Lin Yuquan

1996, 19(2):107-110.

[Abstract](543) [HTML](0) [PDF 209.96 K](200)

Abstract:
The correlation dimension for the time series of blast furnace process varisble,such as blast volume, burden pressure drop and blast pressure etc.,have been estimated by using GP and modified GP algorithms.The predictublity analysis for the process variables have also been investigated.The results show that it is difficult to determine the chaotic attractor of blast furnace condition.It has been found that the predictablity for process variables can be used to niterpret and identity the precursor of biast furnace condition.

12 The Prespect by Using Poor Ore to Produce Sponge Iron

Zhu Zizong

1996, 19(2):117-121.

[Abstract](477) [HTML](0) [PDF 233.22 K](91)

Abstract:
This paper summarizes the status that the coal-based rotary kiln using direct reduction technique to produce spouse iron in the world,introducing successful SL-RN process,investigatins the development presect by using poor ore to produce sponge iron.

13 Energy Assessement for Procedure Rationality of Recycling Materials from Wastes

Liu Jianglong , Ding Peidao

1996, 19(2):122-126.

[Abstract](390) [HTML](0) [PDF 204.92 K](107)

Abstract:
The mathematical relationship for assessing total energy consumption within a material life cycle is presented in this paper. According to the relationship,the procedure rationality of recycling waste may be assessed quantitatively.

14 CIMS Oriented Technology Reformatlon for Foundry

Li Huaji , Qian Hancheng , Peng Xiaodong , Tan Hulxin

1996, 19(2):127-130.

[Abstract](502) [HTML](0) [PDF 244.90 K](131)

Abstract:
Considering from the speciality of foundry. the CIMS frame and the characteristics of each branch system are analysed on the general principles of CIAS. A scheme and the major ptocedure for technology reformation of a foundry are also discussed in this paper.

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