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Volume 22, Issue 169
Displaying 1-18 of 18 articles from this issue
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Kenzou NONAMI, Masakazu MIYASHITA1979 Volume 22 Issue 169 Pages 911-918
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe self-excited vibration of a rotor caused by the internal damping forces active in the nonstationary vibration as it passes through the critical speed is analyzed theoretically and experimentally under the assumption of the linear internal damping forces. Paticularly in the present paper the internal damping is quantitatively derived using the first approximated asymptotic equation and its approximateness is verified experimentally for various external damping conditions compairing with the theoretical solution. Further, an acceleration not causing the self-excited vibration is newly proposed by giving consideration to the nonstationary vibration in the neighbourhood of unstable region.View full abstractDownload PDF (935K) -
Hiroshi YAMAKAWA, Yoshikazu FUSASAKI, Yuichi SAITO1979 Volume 22 Issue 169 Pages 919-924
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSIn the first report, there has been presented a general method of structures in which natural frequencies are associated with objective functions or/and conditions of constraints. In the subsequent three report, the method has been demonstrated in two basic types of problems in this field, taking simple examples in vibration problems of rods, beams and beam-columns under various conditions. In this report, our study is devoted to more complicated optimum design problems in which minimum weight designs with many constraints on natural frequencies are of interest. For brevity, there both fundamental and the second natural frequencies are constrained. And it is shown that the proposed method in the first report is also applicable and effective to such kinds of complicated problems.View full abstractDownload PDF (690K) -
Hisaaki DAIGUJI, Hiroshi SHIRAHATA, Hiroshi YAMADA1979 Volume 22 Issue 169 Pages 925-932
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThree-dimensional steady incompressible viscous flows about a circular cylinder being mounted with its axis normal to a flat plate were studied numerically. First a finite-difference method using the equations in terms of the pressure p, the velocity u and the vorticity ξ was proposed. In the method the cells in an orthogonal curvilinear coordinate system are used, which consists of the equi-potential lines and the streamlines for a tow-dimensional potential flow past a circular cylinder in a uniform flow. It is convenient to use such coordinates to prescribe the initial and outer boundary conditions and to show the secondary flows. Then the flow patterns for the Reynolds numbers 100 and 500 were calculated. The flow separation and the horseshoe vortex at the front of cylinder, anothervotex generating near the side corner, and the shearing stress at the flat plate and the cylinder walls were discussed.View full abstractDownload PDF (722K) -
Nobunori OSHIMA1979 Volume 22 Issue 169 Pages 933-937
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe infinitesimal operators translation and rotation are useful to derive the basic dynamic quantities and corresponding conservation equations fro the energy from and its conservation equation. this technique is applied effectively to continuum mechanics. The general commutation rules between the infinitesimal operators of rheonomic coordinate transformations and the differential with respect to time and space are formulated.View full abstractDownload PDF (580K) -
Kentaro KIKUCHI1979 Volume 22 Issue 169 Pages 938-943
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSIn order to investigate the effect of direct high voltage electric field on the natural convection heat transfer of a vertical heated plate in dielectric liquid, boundary layer equations are solved by profile method. Subsequently, with the use of silicon oil, an experiment was conducted, and it was confirmed that a considerably large heat transfer enhancement over a wide area was expected. Also it was recognized that a decrease of boundary layer thickness by the effect of coulombic force working on space charge generated in fluid, was the primary cause of heat transfer enhancement.View full abstractDownload PDF (638K) -
Naotsugu ISSHIKI, Takao KASHIWAGI1979 Volume 22 Issue 169 Pages 944-951
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSNumerical analysis of the laminar heat transfer in the critical parallel nozzle has been reported in the first paper by the authors. In this report, the mean Nusselt number "Numc" of the critical flow is measured experimentally to compare with the numerical results. It is shown that the critical flow in parallel nozzle is laminar over the whole length of a nozzle when Xcdw-1 ≲102, where Xcdw-1 is the nozzle characteristic Reynolds number. Turbulence arises when Xcdw<-1> ≳ 102, so in this range the influences of three non-dimensional parameters, i.e., sonic point Reynolds number Recdw, ratio of nozzle height to nozzle length d/L and non-dimensional wall temperature Θw are analyzed. Consequently, the experimental expression of the "Numc" can be given. Furthermore, to verify the adequancy of numerical and experimental results, two methods of optical observation are adopted. The optical results agree well with the laminar numerical ones for Xcdw-1 ≲ 102.View full abstractDownload PDF (930K) -
Keiichi HORI, Masao NAKAZATOMI, Kaneyasu NISHIKAWA, Kotohiko SEKOGUCHI1979 Volume 22 Issue 169 Pages 952-959
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSAn experiment of upward air-glycerol aqueous solution two-phase annular flow is made to collect the information on the effect of liquid viscosity on interfacial friction and the main parameters which characterize gas-liquid interface : radial distribution of liquid-phase, wave height and wave frequency. The experimental results show that both the wave height and interfacial friction factor are larger than those in more viscid liquid system. Further, it is confirmed that the mathematical model proposed in the previous report to express the characteristics of gas-liquid interface can also be applied to air-glycerol aqueous solution annular flow. And, a new relationship is introduce between the interfacial friction factor and the parameters characterizing gas-liquid interface with consideration for the effect of wave shape.View full abstractDownload PDF (764K) -
fumito KAMINAGA, Hideo UCHIDA1979 Volume 22 Issue 169 Pages 960-966
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSReflooding in a loss of coolant accident involves unsteady and very complicated phenomena such as quenching. In this study the reflooding is examined using a simple apparatus with a single electrically heated rod. The purpose of this paper is to present qualitative examinations relating to the phenomena during reflood, and to obtain ascending speed of the quench front and heat transfer coefficient during transient. the results are as follows : (1) A boiling region can be divided into two main parts. One is a film boiling region which occupies the greater part of the boiling region. The other is a nucleate boiling region appearing in a small area around the quench front. (2) The heat transfer coefficients of a film boiling region and a nucleate boiling region are about tens to hundreds and more than thousand kcal/m2h°C, respectively. (3) The quench front advances upward at a nearly constant speed when the inlet coolant temperature is as low as 20°C.View full abstractDownload PDF (844K) -
Takashi SONODA, Takeshi SAITO, Hiroshi TANIGUCHI1979 Volume 22 Issue 169 Pages 967-973
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe performance of the steam turbine cycle combined with the heat pump is analyzed from the standpoint of both the 1st law and 2nd law of thermodynamics. this cycle is useful in order to reduce the thermal pollution locally caused by the waste heat from the steam condenser and to raise the total energy efficiency. The following factors are considered here to analyze the performance of this cycle ; the internal efficiency of the steam turbine, the pressure of the steam condenser in the steam cycle, the kind of thermal media (NH3, Rll), the condensing temperature, the evaporating temperature, the outlet, temperature of the cooling water from the evaporator and the internal efficiency of the compressor in the heat pump cycle.View full abstractDownload PDF (770K) -
Tadashi SAWADA1979 Volume 22 Issue 169 Pages 974-981
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSGas dynamic seals with rectangular spiral grooves are studied theoretically taking the effects of sidewalls of the grooves and the effects of gas compressibility into account, and slip boundary conditions are employed. The results are compared with the existing experimental data and the validity of the theory is confirmed over a wide pressure range except for the extremely low pressures. Suggestions are made regarding the choice of the geometrical dimensions, i.e., aspect ratio, helix angle, clearance parameter and groove width ratio.View full abstractDownload PDF (756K) -
A Study on Strength of Toothed Belt : 2nd Report, Influence of Pitch Difference on Load DistributionTomio KOYAMA, Masanori KAGOTANI, Toshinobu SHIBATA, Takeshi HOSHIRO1979 Volume 22 Issue 169 Pages 982-987
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSIn this paper, the load distribution of toothed belt whose pitch is different from that of pulley is discussed theoretically and experimentally. From this study the following conclusions have been obtained : 1) The pitch difference exerts an important influence on the load distribution, so the most suitable pitch difference should be chosen in consideration of the transmissive load, the modulus of elasticity of the belt, the compliance of the bled tooth, the coefficient of friction between belt and pulley. 2) The effectiveness of the theoretical prediction on load distribution is proved by the experimental results.View full abstractDownload PDF (633K) -
Tomio KOYAMA, Masanori KAGOTANI, Toshinobu SHIBATA, Susumu SATO, Takes ...1979 Volume 22 Issue 169 Pages 988-993
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSIn this paper, the relation between the tight side tension, the belt life and the features of fracture of toothed belt is discussed experimentally. Two kinds of toothed belts are used. They are a section-L polyurethane belt using wire rope as the load-carrying cords a polychloroprene rubber belt using glass fibre cord. From the experiment, the following results have been obtained. Both of belts present several feature of fracture which are classified into a break of the cords, a shearing on the tooth, an abrasive wear of the tooth frank, etc. depending on the tight side tension and the number of cycles. The greater the number of pulley teeth is, the longer the belt life is. And life increases with a decreasing tight side tension. However there is no endurance limit observed as steel.View full abstractDownload PDF (856K) -
Komei FUJITA, Akira YOSHIDA, Kazuo NAKASE1979 Volume 22 Issue 169 Pages 994-1000
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSIn order to clarify the optimum design condition of induction-hardened steel fro surface durability, the rolling contact fatigue tests were conducted by using the induction-hardened rollers. The spalling cracks were generally formed at two positions beneath roller surface. This phenomenon and the result of surface durability could be explained by the amplitude of the ratio of orthogonal shear stress to Vickers hardness. The optimum induction-hardening depth for surface durability could be determined for various relative radii of curvature from the results of surface durability and of surface failure and from the calculation of the amplitude of the ratio of orthogonal shear stress to Vickers hardness.View full abstractDownload PDF (859K) -
Hiroshige FUJIO, Toshio AIDA, Yuji MASUMOTO, Takanori TSURUKI1979 Volume 22 Issue 169 Pages 1001-1008
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSIn this paper, the authors investigated experimentally and theoretically the distortions and the residual stresses of gear tooth of standard spur gears made of S35C carbon steel generated by induction-hardening. The main results obtained from this investigation are summarized as follows. (1) Analytical method introduced by the authors is available for the estimation of distortions in the case of induction-hardening of gears. Comparing analytical distortions, such as outside diameter, whole depth and tooth profile, with experimental ones, there are no remarkable difference except pressure angle. (2) Residual stresses from theoretical analysis agree in the tendency with the experimental ones. Consequently, possibility of theoretical analysis of residual stresses of gears in the induction-hardening process could be expected.View full abstractDownload PDF (916K) -
Distortions and Residual Stresses of Gears Caused by Hardening : 4th Report, Case-Hardening of GearsHiroshige FUJIO, Toshio AIDA, Junichi AKIZONO1979 Volume 22 Issue 169 Pages 1009-1016
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSDistortions of case-hardened gears were calculated using the method introduced by the authors, and the results were compared with experimental ones. The results obtained in this paper are summarized as follows. (1) For case-hardening, gear distortions can be calculated tolerably well from the estimation of quenched structure. (2) In this investigation, the quenched structure of SCM21 after case-hardening in the carburizing layer was mostly martensite, and the value of thermal expansion coefficient for each carbon content could be determined by the depth from surface of tooth profile. (3) In this experiment, retained austenite was scarcely observed. But, in the case of much retained austenite, the effect of retained austenite on distortion of gear tooth profile and residual stress should not be ignored.View full abstractDownload PDF (873K) -
teruaki HIDAKA, Yoshio TERAUCHI, Kazuteru NAGAMURA1979 Volume 22 Issue 169 Pages 1017-1025
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe authors carried out an experimental investigation about the torque variation in a single-stage Stoeckicht planetary gear (Type 2K-H) constructed with spur gears with the following results : (i) The torque variation in the planetary gear is caused by the errors per mesh and the run-out errors of each gear. (ii) When the number of error cycles per mesh coincides with all kinds of natural frequencies of the planetary gear, the torque variation of higher-speed shaft increases. (iii) A resonance is caused in the gear testing machine with a planetary gear by the run-out error of the sun gear. Consequently, the torque variation of lower-speed shaft increases.View full abstractDownload PDF (1055K) -
Teruaki HIDAKA, Yoshio TERAUCHI, Kazuteru NAGAMURA1979 Volume 22 Issue 169 Pages 1026-1033
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe authors carried out experimental investigations about the dynamic load and the torque variation in two cases, in which the meshing-phases of each planet gear in a single-stage Stoeckicht planetary gear differ. The results are as follows : (i) The variation of dynamic load due to the errors per mesh in the case in which the meshing-phases of each planet gear are equal is smaller than that in the case in which they are different. But the torque variation of a higher-speed shaft in the case of the former is larger than that in the case of the latter, because the phases of the variation of dynamic load at three meshing points are equal. (ii) The modes of free vibration at the resonance frequency of ring gear change according to the meshing-phases of each planet gear.View full abstractDownload PDF (883K) -
Keizo SAKUMA, Hiromichi ONIKURA1979 Volume 22 Issue 169 Pages 1034-1040
Published: 1979
Released on J-STAGE: February 15, 2008
JOURNAL FREE ACCESSThe properties of cutting force and workpiece deflection in skiving process are investigated experimentally. It is found that the ploughing force acting on a cutting edge has a large proportion of total cutting force. The recommended ranges of the nominal rake angle and the plan angle of a cutting tool are discussed with reference to tool forces and chip formation. From the viewpoint of stiffness, a workpiece supported with the fixed center is better than one with the revolving center at the tailstock and the countersink diameter of center hole should be taken as large as possible.View full abstractDownload PDF (713K)
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