Volume 13,Issue 2,1990 Table of Contents

1 STUDY ON THE CHIP BREAKING LIMITING AND DISCRIMINANT OF TWO-DIMENTION CHIP BREAKING GROOVE

1990, 13(2).

[Abstract](629) [HTML](0) [PDF 0.00 Byte](4)

Abstract:
Tool bits with two-dimention chip breaking groove for turning stainless steel 1Cr18Ni9Ti are investigated, the formulas of limiting feed and depth of cut are obtained, the effects of tool cutting edge angle, chip breaking groove width, corner radius and cutting speed on chip breaking region are analyzed, and the chip breaking discriminant is established. This discriminant may be used to forecast the possiblity of the breaking of chips of tool bits with two-dimention groove or to select the suitable tool bit in turning stainless steels according to a given regime of machining.

2 ENERGY TRANSMISSION MATHEMATICAL MODELS OF MAIN DRIVING SYSTEM OF MACHINE TOOLS

Liu FeiXu Zongjun

1990, 13(2).

[Abstract](548) [HTML](0) [PDF 0.00 Byte](2)

Abstract:
Based on the energy flow path of the drive links of machine tools and the consideration that there exists simultaneously various energy losses in machine tools in operation, the energy transmission mathematical models of the main driving system of machine tools are created by analysing synthetically the energy losses in the motor and mechanical system of machine tools, which lays a foundation for the studies on the energy transmission laws, energy saving and energy information monitoring in machining processes.

3 THE RIGID-VISCOPLASTIC FINIT ELJMENT ANALYSIS OF NON-STATIONARY FLOW OF METALS IN THE EDGE ROLLING

Liao Changrong Chen Ruxin

1990, 13(2).

[Abstract](529) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
The rigid-viscoplastic finite element formulations for the analysis of non-stationary deformation in the edge rolling is established on the basis of the simplified 3-D. element. A new method for obtaining inital velocity field is developed in this paper. It has been used successfully to analyse the non-stationary deformation in the edge rolling of lead plates. The calculated results are found to be in good agreement with those obtained from expriements.

4 NUMERICAL EXPERIMENT OF UNDERWATER SHOCK FOCUSING

Chen Jingqiu

1990, 13(2).

[Abstract](472) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
Using a bicharacteristic method we completed the best numerical experiment of underwater shock focusing. It is very satisfactory that the cavitation appease in numerical completely tally with the experimental resuls.

5 FRP ELASTIC CONSTANTS AFFECTED BY COPULATE STATE BETWEEN PHASES

Zhang Peiyuan

1990, 13(2).

[Abstract](549) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
The mechanical behavior of composite material is greatly affected by the copulate layer between neighboring phases. In present paper three parameters are introduced to describe copulate state between phases. By means of equivalence principle and method in multiphase solid theory, formula containing the copulate state parameters are developed to predict the FRP elastic constants. In the paper the auter proposes that two-or three-test-design methods combining with the formula will approach satisfactory result in predicting FRP elastic constants.

6 AUTOMATIC CONTINGENCY SELECTION AND RANKING USING AN UNIFIED MODEL AND ALGORITHM FOR P - AND Q - SUBPROBLEM

Xu Guoyu Zhu Jizhong

1990, 13(2).

[Abstract](625) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
A new approach of the automatic contingency selection and ranking with the network flow programming (NFP) is presented in this paper. NFP is adaptable to change the network topology as the transmission or generation branches arc in single or multiple outage. Thus the fast calculation of the contingency states by NFP cm provide the urgent information in real time N- 1 security analysis. In the paper, automatic contingency selection and ranking forP- and Q-type subproblem arc solved by an unified network flow model and algorithm. It is based on the existence of weak coupling between real and reactive quantities in power systems. The performance indices to assess the severity of contingencies are defined as the total real and reactive load required to be curtailed. The proposed ACS technique including the model and its algorithm are examined with IEEE 5-, 14-, 30-, 57- and 118- bus test systems on M-340. And the encouraging results are given in the paper.

7 COMPOSITE SYSTEM RELIABILITY EVALUATION CONSIDERING LOAD MODEL

Chen Hua Zhou Jiaqi Tang Nengmin

1990, 13(2).

[Abstract](546) [HTML](0) [PDF 0.00 Byte](2)

Abstract:
The study for dealing with the load model in composite system reliability evaluation is almost at a standstill because of the inherent computational complexity. In this paper, an algorithm for composite system reliability evaluation considering load model is proposed. This method is powerful in computation because it can avoid unnecessary state enumeration by means of the relationship among basic reliability informations of load levels. As an example, the IEEE 24-node Reliability Test System is tested on VAX-11/750 computer. The average CPU time to calculate the reliability indices of the system corresponding to a load level is about 5 seconds.

8 SIMULATION STUDY OF ACTIVE POWER DISTORTION COMPENSATOR

Mao Hengchun Hou Zhenchen Li Zaihua

1990, 13(2).

[Abstract](589) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
In this paper, the effectes of modulation index, modulation frequency, modulation method and LPF parameters on current-fed active compensator arc studied by using digital simulation and the performances of voltage-fed active compensator are compared with those of the current-fed active compensator.

9 A NONLINEAR PROGRAMMING MODEL AND ITS ALGORITHM FOR TRANSMISSION NETWORK PLANNING

Li Binhua Ren Yulong

1990, 13(2).

[Abstract](597) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
The problem of transmission network planning is studied thoroughly by applying the mathmatical optimal tecqhniue in this paper. A novel approach is put forward for computer aided transmission network planning, which is quite different from what is based on D.C. load flow equations. A nonlinear transmission planning model is set up by regarding A.C. load flow equations as the system model. A practical model which can be solved more easily, and an united algorithm are obtained by applying the SUMT to the nonlinear model. The results of some practical examples indicate that this method can not only make the planning results more accurate, but also provide the voltage qualities and produce planning plans autometically and seek the plans optimally and fast.

10 THE MIXED MODE FRACTURE CRITERION OF BRITTLE ROCK UNDER COMPRESSION-SHEAR STRESS STATE

Fu Gang Li He Xian Xuefu Yin Guangzhi

1990, 13(2).

[Abstract](650) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
In this paper the test results of mixed mode fracture of three kinds of brittle rock under two kinds of stress paths are reported. The fracture mechanism and failure patterns of brittle lock under different stress paths are discussed. Theory analysis and test results show that the Compression- Shear fracture criterion of brittle rock can be expressed:

11 THE NORMAL STRESS BEHAVIOUR DURING THE SHEAR STRESS UNLOAD UNDER THE RESTRAINING DILANCY

Wang Yanhui Li Tonglin

1990, 13(2).

[Abstract](556) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
本文通过剪切实验,分析讨论了锯齿状结构面剪切破坏后,在其残余剪切力卸载过程中法向压应力的变化规律,并根据结构面受剪前初始法向压应力的不同而将剪应力—残余法向应力曲线(即τ—Δσ_n曲线)分为Ⅰ型、Ⅱ型两类,从而进一步揭示了结构面在约束剪胀条件下的剪切力学特性。

12 ROLE OF BaO IN MOLD POWDER USED IN CHNTINUKUS CASTING KF STEEL

Chi Jinghao Xie Bing Gan Yongnian

1990, 13(2).

[Abstract](684) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
In this paper, the role of BaO in mold powder used in continuous casting of steel is studied. The pricipal content of the study is about the effect of BaO on melting temperature, Viscosity, and capacity of absorbing inclusion and glassing of molten mold powder. Experiment results reveal that to add BaO into mold powder can decrease the melting temperature and viscosity, and prevent the formation of high melting point particle and crystallizing of mold powder, suitable BaO content in mold powder is quite helpful to increase the capacity of absorbing inclusion of molten mold powder, and to improve the lubrication effect of molten powder film between mold and billet.

13 ROBOT SENSOR SYSTEM USING SLIP DISPLACEMENT SIGNAL

Y. P. Kondraqinko Yang Yongzhen

1990, 13(2).

[Abstract](571) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
problems of designing the robot sensor systems using slip displacement signal indicating slide of the objects between the robot's gripper fingers are discussed in this paper. Basic principles and construction of slip displacement sensors and structure of two types sensors are given. Block diagram of the sensor system algorithm is described for different methods of gripper movement, the testing motions method and the method of continuous raise. Both methods can be used for robot ' RHINO XR-2 '.

14 DETERMINATION OF METALLIC IRON IN HIGH TITANIUM SLAG BY HEADSPACE GAS CHROMATNGRALHY

Huang Zhiqin Lei Qingru You Bo

1990, 13(2).

[Abstract](642) [HTML](0) [PDF 0.00 Byte](4)

Abstract:
The following details are discussed in the present paper, after high titanium slag and H3PO4 is put in the closed system,the .reaction takes place under controlled temperature conditions, and the gas produced is collected. The two phases of gas liquid attain kinetic equilibrium, ihe gas above the liquid is used to make GC analysis with the aid of chromatographic column of 5A molecular sieve, TCD and N2 30ml/min. Satisfactory quantitative results can be achieved with simple instruments and uncomplicated operation technique.

15 SUFFICIENT CONDITIONS FOR SOLUTIONS TO MIN-MAX PROBLEM WITH SATISFACTION CONDITIONS

Zhang Jijun

1990, 13(2).

[Abstract](468) [HTML](0) [PDF 0.00 Byte](1)

Abstract:
In this paper, we prove that when objective functions and constraint-functions are three classes of nonconvex functions, necessary conditions for solutions to min-max problem with satisfaction conditions given in [1] are sufficient conditions.

16 A BOUNDARY ELEMENT METHOD WITH LOWER-ORDER SINGULARITY

Zeng Derong Hu Guohua

1990, 13(2):26-32.

[Abstract](388) [HTML](0) [PDF 267.38 K](598)

Abstract:
In this paper, a lower-order singular BEM based on original BEM is presented by introduccing a new variable of angle. In the new method, kernel of force is the same as kernel of displacement which is only singularity of InR ( R is the distance between a source and a field point ) . Hence, it results in a new BEM formulation, whose singularity is lower than that of the original BEM formulation. What's more, in calculating stress, it eliminates the boundary-layer effect in the main. A software which is based on lower-order singular formulation is used to analysis the bar of 300T coiningmachine, its result is coincident with that obtained by the original BEM and photo-elastic experiment.

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