Volume 12,Issue 1,1989 Table of Contents

1 SOME NEW MACHINING METHODS WITH THE AID OF COMPOUND MOTIONS

Liang Xichang

1989, 12(1):1-7.

[Abstract](493) [HTML](0) [PDF 315.80 K](881)

Abstract:
The paper describes a new theory and methods for designing hyperbola, degenerate circles, involute and roulette curves which have been applied in grinding convex involute gears, cutting special profiles on a gear shaper, grinding the race-way of ball thrust bearings, form grinding and grinding cyclo-cycloidal gears with an abrasive belt. All these applications have been used in industruy with considerable benefits. The curves are produced by different combinations of straight line and circle motions, Given the curve parameters of the workpieces to be machined, the best approximate curve can be obtained from a computer program designed for this purpose.

2 COMPUTER AIDED DESIGN OF THE CORE AND CAVITY OF PLASTIC INJECTION MOULD

He Yulin Xu Shengli Yuan Zhizhong

1989, 12(1):8-13.

[Abstract](703) [HTML](0) [PDF 408.61 K](1305)

Abstract:
This paper discusses the designing of the injection mould for producing the plastic case of TV set carried out in the type IBM PC/XT (or Great Wall 0520)micro-eomputer. The procedure consists of inputting the 2-D drawings of the TV set case with the aid of sub-drawing, coding and menu specifying; setting up the mathematic model according to the relationship between the plastic part and the mould; designing the core and caving of the mould and finally displaying and plotting the drawing of the mould. The connection between the Auto CAD software and the advanced language for orogramming and the data convertion is also discussed.

3 THE OVERLAPPING DECOMPOSITION DECENTRALIZED CONTRAL FOR GENERATOR''''S EXCITER/GOVERNOR SYSTEMS

Chen Ganping Qin Yifrong

1989, 12(1):14-22.

[Abstract](517) [HTML](0) [PDF 369.05 K](1046)

Abstract:
In this paper the generator's exciter/governor system are decomposed by using the overlapping decomposition method, and an overlapping decomposition decentralized control (ODDC) system is designed for the exciter /governor systems. In or.dar to enhance the dynamic qualities of the decentralized control system, the concept of the second feedback system is introduced to modify the first feedback gain matrix on the condition of the structure of the original decentralized control system maintaining unchanged. The practical decentralized control system design and its; simulation results show that this method greatly improves the control effect of the ODDC system and also holds all the advantages of the ODDC system. Besides, this paper indicates that it is a simple and effective method to control excitor/governor system by overlapping decomposition decentralized control strategy.

4 A METHOD OF GENERATING ACTIVE TREE TERMS USING THE "IMPROVED W-ALGEBRAIC METHOD

Li Weiguo Pen Yonle

1989, 12(1):23-25.

[Abstract](392) [HTML](0) [PDF 120.60 K](900)

Abstract:
By defining an operator"M", the paper has applied the improved Walgebraic method to the directed graph. The developed theory does not make non-tree combination type terms and can eliminate a large part of cancellations terms caused by. the active elements or .transformers. The paper has solved the retrogration problem for algorithm of W-algebraic method while used in the directed graph.

5 STUDY OF DIGITAL SIMULATION FOR THE CIRCUIT ELEMENTS AND ELECTROMAGNETIC RELAYS COMMONLY USED IN RELAY PROTECTIVE DEVICES

Wang Xiaoru Mi Linshu

1989, 12(1):26-35.

[Abstract](631) [HTML](0) [PDF 331.11 K](762)

Abstract:
This paper applies the Gear-4 algorithm to constitute the companion models lor the circuit elements and electromagnetic relays commonly used in relay protective devices. The interface computation, which describes the node equation of companion model and differential equation of mechanical moving part for the electromagnetic Jelay, is also presented. For the reason mentioned above, it makes possible* to solve more accurately the transient process of relay protective devices including electromagnetic relay using the companion model method. The simplicity and effectiveness of interface computation have been proved by the example calcultaion.

6 STUDY OF SOLUTION METHODS FOR SEPARATOR EQUATIONS OF HIGH GRADIENT MAGNETIC SEPARATION

Tan Yanyi Yu Zhongming

1989, 12(1):36-44.

[Abstract](572) [HTML](0) [PDF 352.39 K](761)

Abstract:
In this paper, an analytical solution,approximate solution of initial retention, steady-state solution and numerical solution of separator equations of high gradient magnetic separation are discussed. A backward-vave method used to improve the steady-state solution and Treanor-four order Taylor numerical method are suggested for magnetic separator equations and are compared with experimental results.

7 A STUDY OF MOVEMENT LOCUS OF THE INSTANTANEOUS CENTR OF CROSS-SPRING PIVOT

Xian Wu Dong Dawei Luo Dali

1989, 12(1):45-50.

[Abstract](674) [HTML](0) [PDF 240.85 K](967)

Abstract:
The instantaneous center of the cross-spring pivot is studied in this paper. It is also pointed out in this paper that three different kinds of center(the static geometric center the moving geometric center and the instan-tanaous canter), exist when the cross-spring pivot is deflected. Their relationship is calculated, the variation character of the moving geometric center almost condcides with the curve of S.Hildebrand's experiments.

8 POOL BOILING HEAT TRANSFER ON A SINGLE TUBE JACKETED WITH PTRB IN LITHIUM BROMIDE WATER SOLUTION UNDER A VACUUM

Ouyang Degong Hou Manci

1989, 12(1):51-57.

[Abstract](392) [HTML](0) [PDF 291.01 K](992)

Abstract:
本文报导了真空状态下套装不同尺寸的抑泡孔管的单管在溴化锂水溶液中的池沸腾传热实验研究结果,示出了压力(45-45cmmHg)、浓度(0-55wt％)、间隙尺寸(0.5-3.5mm)对沸腾换热的影响。由实验结果回归得到的准则方程可供真空状态下溴化锂水溶液中套装抑泡孔管的单管沸腾换热计算用。

9 ORTHOGONAL COLLOCATION METHOD AND IT APPLICAIONS IN THE CALCULATION OF DYNAMIC CHARACTERISTICS OF HEAT EXCHANGER

Yue Hong Zheng Tikuan

1989, 12(1):58-65.

[Abstract](631) [HTML](0) [PDF 331.25 K](970)

Abstract:
Being a kind of MWR, the orthogonal colloacation method can be conveniently used to reduce the initial-boundary value problems of the partial differential equations to initial value problems of ordinary differential equations. In this paper, the orthogonal collocation method is introduced in detail and by using it the dynamic characteristics of a steam-water heater are investigated.

10 THE THEORETICAL ANALYSES OF SHEAR DESTRUCTION OF THE JAGGED DISCONTINUITY UNDER THE RESTAINING DILATANCY

Li Tonglin Wang Yanhui

1989, 12(1):66-71.

[Abstract](552) [HTML](0) [PDF 264.91 K](826)

Abstract:
In this paper, the formula which indicates the destruction behaviour and shear strength under the restraining dilatancy are put forward on the basis of the, reference [1] and with the asumption of elastic deformation, and the theoretical results are veritied through the model test.

11 AN INVESTIGATION ON THE MULTI-ARCH STRUCTURE OF A STRATA AROUND A STOPE

Cao Shugang

1989, 12(1):72-78.

[Abstract](580) [HTML](0) [PDF 396.93 K](144)

Abstract:
This paper analysis the mechanical process with the photoelast-ic model test ane the finite element method, and presents the basic cause of existing different pressure and different transfiguration in the strata around a stope.

12 A STUDY ON FRACTURE MECHANICS OF BRITTLE MATERIAL WITH PER-CRACKS

Wan Ling Li He Xu Jiang Yin Guangzhi

1989, 12(1):79-85.

[Abstract](550) [HTML](0) [PDF 320.00 K](135)

Abstract:
In this paper the fracture process of specimen,with single crack, double cracks and triple cracks is observed and analysed. The experimental results show that the fracture process of specimen is different because of the differention of the number, the distance and the type of array of cracks. And the fracture propagation of specimen with triple cracks and double cracks is foundmentally the same.

13 THE MATRIX METHOD FOR ESTABLISHING DISCRETE SYSTEM DYNAMIC EQUATIONS

Yin Xuegang

1989, 12(1):86-97.

[Abstract](821) [HTML](0) [PDF 394.76 K](140)

Abstract:
In this paper a matrix method for establishing discrete system dynamic equations is presented. Using this method to establish discrete system dynamic equations, netting but the derivative of function, and matrix multiplication are required. This method suits to the holonomic system as well as the linear nonholomic system.

14 TRANSFORMATION SEMIGROUP OF THE FINITE AUTOMATA AND ITS RECOGNIZATION INFORMATION

Zhou Deyu

1989, 12(1):98-104.

[Abstract](542) [HTML](0) [PDF 352.27 K](97)

Abstract:
In the analysis and cotnriol of sequencense system, We Want to know the behaviour of the systen, i.e what information ( or input) applied to the system can reach expected state ( or output ) . This problem is concerned with the recognization problem of the finite automata. A way to use (0,1 )-matrix to calculate this transf rmation semigroup of the finite automata and its recognization information is proposed, and variour specific (0, 1 ) -matrix represents information is analyzed in this paper.

15 THREE CRITICAL POINTS THEOREM AND ITS APPLICATIONS

Zhang Shiqing

1989, 12(1):105-107.

[Abstract](778) [HTML](0) [PDF 121.65 K](188)

Abstract:
In this paper, by use of the pseudo-gradient vector field, the three critical points theorem in [2] is extended to the C1 function in the Ba-nach space, and therefore the three critical, points theorem in [5] is strengthened and the existence of the saddle point of the C2 function is discussed.

16 NECESSARY CONDITIONS OF SOLUTIONS FOR VECTOR EXTREMAL PROBLEMS

Yang Xinmin

1989, 12(1):108-114.

[Abstract](548) [HTML](0) [PDF 349.83 K](125)

Abstract:
In this paper, we give the theorems of the alternative, the lag-range multipler theorem, Kuhn-Tucker conditions, saddle poin t optimality conditions and duality theorem concerning efficient and weak efficient solutions when objective function be D-ordered subconvexlike. The results here have extended many conclutions of [1][3][4]

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