Volume 12,Issue 4,1989 Table of Contents

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  • 1  INVESTIGATION ON THE FORMATION OF SINE IMAGE OF RECTANGULAR GRATING
    Chen Tangguo Yuan Xianhui Huang Bo
    1989, 12(4):1-9.
    [Abstract](584) [HTML](0) [PDF 265.59 K](870)
    Abstract:
    OTF of a diffraction - limited incoherent imaging system is equivalent to a linear filter of the spectrum of the intensity when thesystem focusing error is very serious,we derive a formularand these results of calculation agree with the experimental data, which is exact explanation to the sine image of rectangular grating.
    2  PREPARATION OF''''ULTRAFINE TITANIUM DIOXlDE BY PEPTIZATION METHOD
    Zhang Qichao Yang Jun Lu Rong/hong Xu Dingkan
    1989, 12(4):10-15.
    [Abstract](720) [HTML](0) [PDF 253.74 K](783)
    Abstract:
    The principles of transparent ultrafinc titanium dioxide particles prepared with the peptization method are introduced in this paper. The effects on uitrafine particles are discussed,the p: oducts are tested by X-ray analysis and electronic microscopy, and the dispersity of the uitrafine titanium dioxide particles in the organic solvents is examined.
    3  IN SITU SPECTROELECTROCEMISTRY AND ITS APPLICATIONS ON CONVENTIONAL FT-IR SPECTROMETER
    Chen Changguo Huang Zongqing
    1989, 12(4):16-21.
    [Abstract](567) [HTML](0) [PDF 294.81 K](912)
    Abstract:
    In situ spectroelectrochemistry on a conventional FT-IR spectrometer and its applications in the following fields are briefly described: electrochemical reactions in solution, the determinations of formal potential ( E01 ) and electron transfer number ( n ) , chemically modified electrode film, the oxidation, corrosion and inhibition on metal surface.
    4  RESEARCH ON A KIND OF GREY LINEAR PROGRAMMING AND THEIR DUAL THEORIES
    Li Maoqin Duan Yurong
    1989, 12(4):22-29.
    [Abstract](364) [HTML](0) [PDF 275.15 K](843)
    Abstract:
    In this paper, a kind of grey linear programming with grey interval coefficients is discussed,the definitions of the first and second whitenized linear programmlngs and the grey dual linear programmings are presented, the relationships between the solutions of the above three kinds of programming and the solution of the primal programming are explored, and some new conclusions are obtained.
    5  DECOMPOSITION OF THE COMPLETE HYPERGRAPH INTO THE C-DEGREE H-HYPERSTAR
    Liu Qiongsuu
    1989, 12(4):30-37.
    [Abstract](515) [HTML](0) [PDF 259.00 K](699)
    Abstract:
    本文论证了超图可c度h-HS分解的存在性条件,同时,给出了超图K_n~3可4度3-HS分解存在的充要条件,部分地解决了文献〔3〕中遗留的问题。
    6  A NEW METHOD OF RESEARCHINE THE SITE DUPLE FACE DYNAMIC BALANCE OF MACHINE RIGID ROTATOR BASE DON AMPLITUDE MEASUREMENT
    Tang Yike
    1989, 12(4):46-54.
    [Abstract](546) [HTML](0) [PDF 339.76 K](297)
    Abstract:
    In this paper, a new method of researching; the site dupleface dynamic balance of machine rigid rotator, namely duple test weightmethod is presented. Weight the new method against the existing method,namely single test weight method [1], both the efficiency increasing and theenergy-consumming dicreasing would be forty percent and over, with thebasic points of vibration theory, the formula of calculating weight andposition of the duple face dynamic unbalance of a rotator by means ofapplying the duple test weight is developed in detail. The method in handll-ing distinct bearing form is also discussed. Rightness of the new method isproved out by the living example of the simulant contrast testing carried outn the dynamic balance test machine and the site balance for a rotatorsystem of motor.
    7  AN AUTOMATIC VOLTAGE REGULATOR USING IDENTIFIED MODELS
    Chen Ganping Qin Yihong Xu Guoyu
    1989, 12(4):55-62.
    [Abstract](466) [HTML](0) [PDF 421.49 K](157)
    Abstract:
    This paper obtains the mathematical model of a single machine infinite bus power system using the idea of parameter identifications. Because the noise is considered in parameter identification process, the model reflects the real system more exactly. On the base of the identified model this paper also presents a discrete automatic voltage regulator by minimum variance control principles. In order to avoid the static error, we combine discrete minimum variance control with continuous integral control and get very satisfactory effects. This proposed control strategy is very easy to realize. The simulation results show that in every case the dynamic qualities of the proposed control strategy are incomparably superior to that of the conventional PI regulator, which means the proposed control strategy has great practical values.
    8  NUMERICAL ANALYSIS OF CASCADE FLOW FIELD IN TURBOMACHINES BY BOUNDARY ELEMENT METHOD ENTIRELY
    Lin Chengxian
    1989, 12(4):81-85.
    [Abstract](494) [HTML](0) [PDF 201.48 K](140)
    Abstract:
    In order to compute the incompressible plane cascade flowfield in turbomachines with nothing but the Boundary Element Method, thispaper presents a numerical method by which both the velocity potentials andthe tangential velocities along the surfaces of cascade profile are computed by the Boundary Element Method, and because of this method, good results are obtained.
    9  CALCULATION OF THIN PLATES BENDING EEFORMATION AND CRITICAL PRESSURE BY THE TCHEBYCHEV''''S POLYNOMIALS
    Feng Xiangui
    1989, 12(4):86-93.
    [Abstract](882) [HTML](0) [PDF 273.88 K](171)
    Abstract:
    In this paper trial functions of the second Tchebychev's polynomials is used with Cantorovich variational method in energy functional of thin plate. Bending deformaion of rectangle plate under even loads or concentrate force with several bearing and critical pressure in buckling is resolved. Though the first similar is used but calculations indicate that this method is simple and exact in engineering.
    10  ON THE RELATION BETWEEN THE ROTATION RATE AND NOISE LEVEL FOR BKY63-11 MINE AXIAL AUXILIARY FAN
    Yu Jiliang He Ronggui
    1989, 12(4):94-99.
    [Abstract](2425) [HTML](0) [PDF 226.55 K](147)
    Abstract:
    The noise of mine axial auxiliary fan is comprised of many noise sources. In this paper, a synthetic analysis mode between the speed of revolution and A-weight noise level for BKY63-11 mine axial auxiliary fan is presented and is proved to tally with the actual situation by test.Meanwhile, the maine noise source of axial auxiliary fan is analysed.
    11  STUDY ON THE OPTIMUM DISTANCE BETWEEN CUTTING SLOTS FOR WEDGE PICKS
    Chen Qu Gao Tianlin
    1989, 12(4):100-105.
    [Abstract](636) [HTML](0) [PDF 286.14 K](149)
    Abstract:
    r The effect of the distance between cutting slots on the cutting specific energy consumption experimentally through cutting artificial coal samples with wedge picks is discussed in this paper. The optimum distances between cutting slots in different cut depths are presented, and the theoretical values are in good agreement with the experimental resurts.

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