JaLCDOI 10.18926/19684
FullText URL Mem_Sch_Eng_OU_21_2_47.pdf
Author Taniguchi, Takeo| Tsurumi Yasuo|
Abstract The aim of this paper is to propose new automatic mesh generator for the finite element analysis of threedimensional structures consisted of plates and beams. The strategy of the proposed one is as followings; Firstly, subdivide the structure into two-dimensional and one-dimensional structural components. Secondly, generate mesh pattern for each of them, and finally combine them so that they reconstruct the original configuration. By using the proposed method the modeling of, for example, steel bridge structures for Finite Element Analysis is easily and also fastly completed. Some examples of the application of the proposed method are presented, and from the examination of the results further important informations for the design of better method are also given in this paper.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1987-03-05
Volume volume21
Issue issue2
Start Page 47
End Page 63
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002309157
JaLCDOI 10.18926/15841
FullText URL Mem_Sch_Eng_OU_10_1_61.pdf
Author School of Engineering, Okayama University|
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1975-07-01
Volume volume10
Issue issue1
Start Page 61
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307517
JaLCDOI 10.18926/15840
FullText URL Mem_Sch_Eng_OU_21_2_31.pdf
Author Taniguchi Takeo| Sanada Kenji| Matsumoto Hajime| Moriwaki Kiyoaki|
Abstract The aim of this paper is to present some remarks on the arrangement of finte element mesh modeling of the area adjacent to the crack-tip which locates in two-dimensional area. Since the stress distribution near crack-tip is singular, the arrangement of mesh pattern and the selection of mesh type in the crack area govern the accuracy of the solution. This paper gives some informations on the arrangement of finite elements in the area which are obtained through numerous number of numerical experiments. And the effectivity of Zooming Technique for stress analysis is clarified through the experiments.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1987-03-05
Volume volume21
Issue issue2
Start Page 31
End Page 45
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307123
JaLCDOI 10.18926/15839
FullText URL Mem_Sch_Eng_OU_21_2_21.pdf
Author Myojin Sho| Kishino Keiichi|
Abstract Car ownership in households is analyzed by disaggregate behavioral modeling technique. Two models are built to analyze characteristic features of car ownership. The results are (1) The number of driver licenses in a household is, as a matter of course, most influencing on car ownership and multi-ownership. (2) Family size is the second most influencing. (3) Utilily obtainable by owning second or third car is higher in the household of primary industry than that of the other industry. (4) Inclination of household to be car owner is stronger in a sparsely inhabited zone than in a densely inhabited.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1987-03-05
Volume volume21
Issue issue2
Start Page 21
End Page 30
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307983
JaLCDOI 10.18926/15838
FullText URL Mem_Sch_Eng_OU_21_2_9.pdf
Author Kawara Osami| Nasu Kiyotaka|
Abstract This study dealt with the characteristics of hydrodynamics of Kojima Lake and the influence of a regional sewage treatment system in construction on the lake. Clockwise and anticlockwise circulations are caused by seasonal winds in summer and winter, respectively. The distribution of a conservative material continuously discharged off the shore of the sewage treatment plant is scarcely affected by seasonal winds and river discharges. The sewage treatment system improves the water quality of the lake except T-N.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1987-03-05
Volume volume21
Issue issue2
Start Page 9
End Page 19
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307442
JaLCDOI 10.18926/15837
FullText URL Mem_Sch_Eng_OU_21_2_1.pdf
Author Takemoto Yoshito| Hida Moritaka|
Abstract We investigated the effects of resolved interstitial oxygen or nitrogen atoms and of quenched-in strain on the hardening of the single crystals grown from molten Ti-14 and 20wt pct Mo alloys. The aging treatment at 623K in atmosphere much more increased in the hardness of specimen surface than that in argon atmosphere. The quenched-in compressive stress enhanced age hardening due to omega formation. We surveyed in detail the hardness changes toward the center of plate-shaped single crystal.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1987-03-05
Volume volume21
Issue issue2
Start Page 1
End Page 7
ISSN 0475-0071
language 日本語
File Version publisher
NAID 120002307640
JaLCDOI 10.18926/15836
FullText URL Mem_Sch_Eng_OU_21_1_81.pdf
Author Nago Hiroshi| Maeno Shiro|
Abstract Under the attack of storm waves, there are many destructions of coastal structures due to scouring, sinking and sliding. These types of destructions are considered to be in close relation to the dynamic behavior of sand bed around the structures. In this study the characteristics of pore water pressure and stresses in the sand bed around a breakwater under the attack of superposed waves are treated theoretically. The results show that during the crest or the trough being in front of the structure the strength of sand bed around the structure decreases notably and the unstable zone will occur.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-11-15
Volume volume21
Issue issue1
Start Page 81
End Page 91
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307224
JaLCDOI 10.18926/15835
FullText URL Mem_Sch_Eng_OU_21_1_71.pdf
Author Takeshita Yuji| Nishigaki Makoto| Kohno Iichiro|
Abstract It is difficult to determine the coefficients of groundwater flow from the data which were obtained from the drawdown test in a multiaquifer system. In this paper, new methods of analyzing drawdown-tests are developed and illustrated with the example to determine aquifer coefficients. In a double-layered aquifer, the analytical solution of drawdown test, in which water is discharged from both layers, is derived. And also the theoretical solution to determine the coefficient of storage by using an index of elasticity of a confined aquifer is derived. From these solutions, methods of determining the coefficient of transmissibility in a double-layered aquifer and the coefficinent of storage in a confined aquifer are got. The example analysis to determine aquifer coefficients is shown. As a result, the characteristics which were obtained by these methods are verified by the real drawdown test data.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-11-15
Volume volume21
Issue issue1
Start Page 71
End Page 79
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307954
JaLCDOI 10.18926/15833
FullText URL Mem_Sch_Eng_OU_17_2_31.pdf
Author Taniguchi Takeo| Ikuta Shusaku|
Abstract New estimation method of the optimum relaxation factor for the successive overrelaxation method (SOR) is proposed, and the efficiency of the new method is surveyed through a number of numerical experiments. This method can a priori determine the value of the factor by using only the topological properties of the problem, and it is valid for a sparse set of linear equations obtained by using the five-point difference scheme for any rectangular area with arbitrary boundary conditions. The experiments clarify that the method can estimate good approximate value of the factor.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-06-30
Volume volume17
Issue issue2
Start Page 31
End Page 46
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307996
JaLCDOI 10.18926/15832
FullText URL Mem_Sch_Eng_OU_21_1_57.pdf
Author Sakata Kenji| Kohno Iichiro|
Abstract New prediction equations of shrinkage and creep of concrete are proposed, and the efficiency of the new equations are investigated through a number of experimental data. Furthermore,the characteristics and applications of the prediction equations presented in the codes of many countries are also discussed. The results showing that the new equations could estimate shrinkage and creep of concrete within a certain measure of accuracy were obtained.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-11-15
Volume volume21
Issue issue1
Start Page 57
End Page 70
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307146
JaLCDOI 10.18926/15831
FullText URL Mem_Sch_Eng_OU_21_1_45.pdf
Author Totsuji Hiroo|
Abstract The total charge fluctuation spectrum of ionic mixtures is analyzed on the basis of the solution of the hypernetted-chain equation for the binary ionic mixtures. A simple but sufficiently accurate scaling law in the domain of intermediate coupling is obtained and the result is applied to the calculation of the bremsstrahlung emission and absorption rates in high density plasmas composed of ions of many species.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-11-15
Volume volume21
Issue issue1
Start Page 45
End Page 55
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307995
JaLCDOI 10.18926/15830
FullText URL Mem_Sch_Eng_OU_21_1_31.pdf
Author Totsuji Hiroo|
Abstract Surface properties of classical one-component plasma are investigated by numerical experiments on the system with periodicity in two directions perpendicular to the planar surface. The density profile, the electrostatic potential, the electric field, and the surface energy are obtained for intermediate values of the coupling parameter of bulk part r and compared with earlier experiments on spherical system. For r=10, the surface energy is almost the same as earlier result. For r =1, however, the surface energy is reduced about a factor of 2. The consistency of experimental values of the potential with the exact relation is checked and necessity of large system size is pointed out.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-11-15
Volume volume21
Issue issue1
Start Page 31
End Page 43
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307599
JaLCDOI 10.18926/15829
FullText URL Mem_Sch_Eng_OU_21_1_17.pdf
Author Akagi Fumio| Osaki Hirokazu|
Abstract Assembly line balancing is to assign work elements to serial work stations so as to make the work content at each station as close as possible to one limiting cycle time or pitch time, i.e., an upper time limit over every station. Until now, it is usually assumed that the performance rates of work stations are constant. But in practice the performance abilities of workers, machines or robots are varied by their own working conditions. Then the actual station times are different from standard ones, and consequently the line balance may diminish in many cases. Therefore in this paper, we propose an improved balancing method, in which work elements can be assigned to the work station having the upper time limit changed by its performance rate or ability. Further we develop the computer program of the proposed method and provide an illustrative problem and computational results. In an application of our method to the practical problems, it is shown that the actual efficiency of the production line becomes near that planned.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-11-15
Volume volume21
Issue issue1
Start Page 17
End Page 30
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307409
JaLCDOI 10.18926/15828
FullText URL Mem_Sch_Eng_OU_17_2_15.pdf
Author Tanada Yoshihiro| Sano Hiroya| Xu Hai|
Abstract Optical-fiber multi-level PCM transmission system is investigated on the transmission distance and bit rate. A communication channel is established as follows: a light signal is modulated in intensity with a completely-balanced M-Ievel code at a transmitter, and is propagated over an optical glass fiber, and is demodulated at a receiver where the signal with an additive noise is processed through a PD, an equalizing amplifier, a matched filter, (M-l) comparators and a decision circuit. The relative power of the noise from the amplifier is increased in accordance with the reciprocal of fiber's transmittance, where shot noise and thermal noise are smoothed and decreased in power by the matched filter. The relation between the BER and the SNR leads the transmission distance. The product of the transmission distance and bit rate takes the large maximum at the large values of SNR and M. The large value of M is suitable for low-speed and high-rate system, and the interference system.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-06-30
Volume volume17
Issue issue2
Start Page 15
End Page 29
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307714
JaLCDOI 10.18926/15827
FullText URL Mem_Sch_Eng_OU_21_1_1.pdf
Author Funabiki Shigeyuki| Imanaka Akira| Himei Toyoji|
Abstract In the power converter of ac drive system the switching behavior of semiconductors causes the distorted voltage and current waveforms, thus the drive characteristics are affected by them. It is, especially, an essential problem that the distorted current waveforms induce the torque ripple. It is assumed in the previous analysis that the input voltage of inverter is a ripple-free dc one. In industry, however, the input voltage of inverter is gained by rectifying the ac voltage. The torque ripple is caused by not only the behavior of inverter but also the behavior of converter. It is required to develop the analysis taking account of the both behaviors. In this paper, the analysis of brushless-dc motor drive system is proposed taking account of the ac supply, power converter, motor and load. This analytical method is the most suitable one for the analysis of practical system. The effects of factors, e.g. filter constants, inverter frequency, phase relation between ac supply and inverter cycle, load and inertia on the speed variation are revealed by this analysis. Further, the decision of filter constants is discussed from a view of speed variation.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-11-15
Volume volume21
Issue issue1
Start Page 1
End Page 16
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307821
JaLCDOI 10.18926/15826
FullText URL Mem_Sch_Eng_OU_17_2_1.pdf
Author Nakanishi Sen-ichiro| Katsuyama Yoshiaki| Himei Toyoji|
Abstract The paper presents the computer aided design (CAD) method, the program, the design and the experimental results of inverse parallel thyristor phase control circuits. The calculated values agree well with the measured. The CAD program contains the next two methods which are inquired carefully by authors, such as (i) the optimization by SUMT (Sequential Unconstrained Minimization Technique) method, and (ii) the combined use of the gradient and the cramp calculation methods.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-06-30
Volume volume17
Issue issue2
Start Page 1
End Page 14
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307323
JaLCDOI 10.18926/15825
FullText URL Mem_Sch_Eng_OU_20_2_55.pdf
Author Taniguchi Takeo| Mitsuoka Kazuhiko| Kajitani Eiji|
Abstract In this study a new automatic mesh generator for 2- dimensional finite element analysis is proposed, and its effectivity is surveyed through a number of test examples. Proposed one is for a micro-computer, and the program is written in BASIC. The user needs no preparation for making finite element model in advance. All of the neccessary informations are displayed on CRT display and its user may answer for questions. It is expected that the cost neccessary for preparing the input-data for finite element analysis is largely decreased.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-02-28
Volume volume20
Issue issue2
Start Page 55
End Page 66
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307353
JaLCDOI 10.18926/15824
FullText URL Mem_Sch_Eng_OU_17_1_97.pdf
Author Oda Kiichi| Yoshio Tetsuo| O-oka Kazuo|
Abstract A series of ferroelectric glass-ceramics was elaborated by the controlled growth of Ba(1-x)Sr(x)TiO(3) crystal particles in the glass system 60[Ba(1-y)Sr(y)]TiO(3)-10Al(2)O(3)-30SiO(2)(0≦y≦0.2) in molar basis. Analysis of crystal phases by X-ray diffraction revealed that Sr content in Ba(1-x)Sr(x)TiO(3) increased with increasing content of SrO in glasses by its preferential transfer into the crystal phase, and the appropriate temperature for the crystal growth was 1100°C. Curie temperatures of glass -ceramics shifted to lower temperature with increasing SrO content in the crystal and comparatively high dielectric constant was obtained at room temperature for a glass-ceramics with y=0.2. Frequency dependences of dielectric constant and loss tangent were examined in the frequency range from 1 K to 1 M Hz.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1983-02-25
Volume volume17
Issue issue1
Start Page 97
End Page 105
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307890
JaLCDOI 10.18926/15823
FullText URL Mem_Sch_Eng_OU_20_2_47.pdf
Author Inouye Hiroshi|
Abstract When expressway and roads coexist, it is necessary to establish a reasonable traffic share between them. It may be practiced by the regulation of toll-rate of expressway. But at an occasional traffic congestion, the reasonable share is disturbed, so that some traffic control means should be taken. In this paper, we deal how to control inflows on expressway, from a viewpoint of the optimal share between expressway and roads. The minimization of total travel cost in a system is aimed under traffic equilibrium conditions. The problem is formed as a two-stage programming model, and a simple example solving the problem is showed.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-02-28
Volume volume20
Issue issue2
Start Page 47
End Page 53
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307423
JaLCDOI 10.18926/15822
FullText URL Mem_Sch_Eng_OU_20_2_35.pdf
Author Nago Hiroshi| Maeno Shiro|
Abstract Under the attack of storm waves, there are many destructions of coastal structures in the forms of sinking and sliding. These types of destructions will be in close relation to the dynamic behavior of sand bed around the structures. From this point of view, in this paper, we investigate the characteristics of the pore water pressure and effective stresses in the highly saturated sand bed under oscillating water pressure theoretically. The results indicate that the oscillating water pressure induce the notable drop of strength of sand bed around the structure under certain condition.
Publication Title Memoirs of the School of Engineering, Okayama University
Published Date 1986-02-28
Volume volume20
Issue issue2
Start Page 35
End Page 45
ISSN 0475-0071
language 英語
File Version publisher
NAID 120002307664