著者

松平 精

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:00214728)

巻号頁・発行日

vol.60, no.464, pp.908-915, 1957

被引用文献数

3

著者

秋保 良太 杉本 尚哉 武田 紘一 野口 洋介 三浦 得太郎

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.79, no.806, pp.3979-3992, 2013 (Released:2013-10-25)

参考文献数

11

被引用文献数

2 2

---

Transferred arc oscillates in an alternating magnetic field imposed perpendicularly to the arc. The amplitude of oscillatory arc motion can be varied easily by adjusting the magnetic flux density. The heat flux distribution can be controlled by changing the wave form of the magnetic field. Using such magnetically driven arc, the authors developed a novel heat treatment system which consisted of a device for the generation of DC arc, that for the formation of various types of magnetic field, a mechanism for travelling the work piece and water circuit for quenching the heated material. Heat treatments for the steel material of S45C were performed using different wave forms of the magnetic field. The magnetically driven arc was able to produce various patterns of drawing on the steel surface such as a single belt with broad width, two parallel straight lines with different spacing, a series of diamond form and two parallel wavy lines. It was confirmed that Vickers hardness increased more than three times after the heat treatment.

著者

高橋 潤

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:00214728)

巻号頁・発行日

vol.110, no.1069, pp.906-907, 2007

著者

Junji YOSHIDA Nobuyuki KAWAGOE Tomohiro KAWAMURA

出版者

一般社団法人 日本機械学会

雑誌

Journal of System Design and Dynamics (ISSN:18813046)

巻号頁・発行日

vol.7, no.3, pp.293-303, 2013 (Released:2013-09-30)

参考文献数

18

被引用文献数

2

---

Bicycles are popular with the general public because of their low price and easy maintenance, and they will be an important vehicle in the future because of their low environmental load. Improving the comfort of the ride is one of the important factors that will lead to increased popularity. We attempted to increase comfort by reducing vibration, and evaluated the results with a subjective test. We determined that low frequency vibration of the seat greatly affected the comfort of the ride. We then performed a transfer path analysis (TPA) and a hammering test to investigate how the vibration characteristics of the bicycle affected the vibration of the seat. Through TPA, the rear of the bicycle frame was found to have a high influence on the seat vibration, and the vibration behavior was obtained by modal analysis. In order to reduce seat vibration, a spring was inserted in the front of the seat and, to increase the stiffness, a steel plate and bolts were attached to the rear of the frame. As a result, the seat vibration while riding was decreased by about 10 dB, and the comfort of the ride was greatly improved.

著者

徐 放 趙 希禄 萩原 一郎

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.78, no.787, pp.783-798, 2012 (Released:2012-03-25)

参考文献数

12

被引用文献数

1 5

---

As an important process for reverse engineering, automatic registration is usually divided in two steps, the coarse one and the fine one. In coarse step, an initial estimate for relative rigid-body transform can be brought to realization by searching some similar geometry, and guessing the corresponding region,. In fine step, highly accurate alignment can be achieved by searching an approximate correspondence repeatedly. For two steps, researching on the first one is more important, because the coarse step will requires more computation time and the accuracy will affect the next step. Various methods such as Genetic algorithms, geometric histogram, graduated assignment, feature matching were submitted or applied. However those methods either need large computing time or only can be used upon the satisfaction of some limited conditions. In this paper, a new method base on CDCP model, including location descriptors, classification descriptors and direction descriptor, was .location descriptors and direction descriptors can provide the necessary information for matching the corresponding points, and classification descriptors can make this process more accurate and efficiency. Experimental results of three 3D images taken by laser scanner are carried out to compare the registration results of proposed method with other twins, and proposed method can be confirmed make the coarse registration process be high speedily without any limited condition.

著者

Satoshi UEHARA Makusu TSUTSUI Kentaro DOI Masateru TANIGUCHI Satoyuki KAWANO Tomoji KAWAI

出版者

一般社団法人 日本機械学会

雑誌

Journal of Biomechanical Science and Engineering (ISSN:18809863)

巻号頁・発行日

vol.8, no.3, pp.244-256, 2013 (Released:2013-07-31)

参考文献数

23

被引用文献数

3 4

---

In the present study, we address theoretical approaches for the experimental results to investigate the flow dynamics of λDNA through a nanochannel in which two nanoelectrodes are integrated. In order to elucidate the relationship between the longitudinal ionic current and the electrophoresis of λDNA in the specific micro/nanofluidics, we develop a theoretical model for the macroscopic fluid dynamics in a Lagrangian framework. The measured current change associated with a single molecule translocation through the channel is explained by the principle of the Coulter counter that allowed to predict the conformation of λDNA. We also analyze the local velocity of λDNA passing through a nanoscaled confined channel. A result from the model is in considerable agreement with the experimental observations for the electrophoretic flow of λDNA. The basic knowledge obtained here may be useful in developing electrical methods for controlling the electrophoretic velocity of single-molecule DNA for realizing the nanopore sequencer.

著者

河上 清源 田辺 秀敏 神蔵 貴久 永廣 健太郎 清水 浩 吉田 博一

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.72, no.719, pp.2123-2129, 2006-07-25 (Released:2011-03-04)

参考文献数

4

---

All wheel drive vehicles with in-wheel motors can control the yaw-moment of the vehicle by utilizing force distribution. When the power output of the in-wheel motor stops or the rotation clings, the vehicle becomes unstable by the unbalance of the right and left driving forces. The yaw rate and the lateral acceleration were measured when the motor broke down using an electric vehicle with in-wheel motors on all of its wheels. Not small influence was occurred on the test when the motor breaks down while accelerating. It was effective to stop the motor power output on the same axle when one of the motor broke down, Even if one motor were to break down, the control algorithm with high redundancy and safety features makes possible for the vehicle to keep running using the other motors.

著者

田中 陽介 清水 康夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.79, no.804, pp.2874-2883, 2013 (Released:2013-08-25)

参考文献数

8

被引用文献数

1 1

---

We have been investigating small and high-strengthened single threaded worm gear. Previous our studies have shown that reducing thickness of worm tooth on addendum face enlarges elastic deformation of worm wheel. This proposed profile has advantages on improving contact ratio, gear efficiency, strength against impact force and fluctuation in torque. Though we have modified the profile of worm, we have not reported on a profile of worm wheel. In this paper, we propose the MUB theory that new profile of worm wheel improve contact ratio without increasing tip diameter of worm wheel. At first, we focused on meshing under base circle of worm wheel, and investigated geometrical shape on dedendum face manufactured by hob cutter. As a result, we derived formula of new profile of worm wheel for meshing under base circle. In addition, the MUB theory was verified by the experiment that used an actual worm wheel with MUB profile. It was shown that we obtained a new finding by the process of this research.

著者

大西 領 高橋 桂子 小森 悟

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.72, no.722, pp.2441-2448, 2006-10-25 (Released:2011-08-16)

参考文献数

21

被引用文献数

1 1

---

The collision frequency of inertia particles in turbulent flows is governed by a wide range of scales of flow motion. Recent studies have shown that large-scale energetic eddies dominate the relative velocity between two colliding particles (the turbulent transport effect), whereas small-scale dissipative eddies can enhance the collision frequency significantly by inducing local non-uniform particle distribution (the accumulation effect). In this study, we have developed an integrated collision kernel model, which takes into account both the turbulence effects and can predict collision frequencies at arbitrary Reynolds numbers and particle inertia. In addition, we have implemented the developed collision kernel model into a large-eddy simulation (LES). We have performed our developed LES for particle collision growth in an isotropic evolving turbulence. A direct numerical simulation (DNS) for the same system has also been done. Comparison between our LES and DNS predictions has confirmed that our LES can predict the particle collision growth in the turbulent flow.

著者

成田 吉弘

出版者

一般社団法人 日本機械学会

雑誌

最適化シンポジウム講演論文集

巻号頁・発行日

vol.2000, pp.229-234, 2000

---

A new multi-objective design approach is proposed for handling many different objective functions in the design problem of laminated composite plates. First, a number of various vibration and buckling eigenvalues are calculated for some discretized fiber angles of the plate by the Ritz method. These eigenvalues are taken to be the object functions. The second step is based on statistical treatment of the data. For each object function, the calculated eigenvalues for different fiber angles are normalized by the maximum value and then the deviated values are determined on the assumption that the eigenvalues are sujected to the Gaussian distribution with the standard deviation of 10 and average of 50. The optimal fiber angle, within the discretized values of fiber angles, is determined by examining the sum of the deviated values of all the object functions.

著者

原 乙未生

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌

巻号頁・発行日

vol.46, no.310, pp.5-10, 1943

著者

高橋 安人

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌

巻号頁・発行日

vol.53, no.375, 1950

著者

滝口 清昭 児矢野 英典 河野 賢司

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.77, no.778, pp.2310-2322, 2011 (Released:2011-06-25)

参考文献数

7

---

Among the three components of electromagnetic field (radiated field, induced field and quasi electrostatic field (QEF)), the QEF has a characteristic of decaying proportional to cube of the distance. Regardless of the QEF's potential characteristics, QEF has been treated as unimportant in the past. In this paper, we developed a novel proximity sensing technology applying QEF. Noncontact and noninvasive object sensing is realized by using equilibrium of QEF distributions generated with the multiple electrodes structure. From results of electromagnetic simulation and experimental analysis, we clarified our method can improve the detection resolution of conventional proximity sensing method drastically, because the detection resolution in our method doesn't depend on QEF frequency generated by quadrupole electrodes, but depends on the parameter of the gap size between each electrode. Finally, we focused on human vein sensing, as one of the most important application example of our technique, which is well known as a biometrics technology. From the electromagnetic simulation, we confirmed our method is applicable to the vein sensor by using the matrix array structure of the fundamental element of quadrupole electrodes.

著者

趙 昌煕

出版者

一般社団法人 日本機械学会

雑誌

設計工学・システム部門講演会講演論文集

巻号頁・発行日

vol.2007, pp.107-108, 2007

---

The present design education using the two-dimensional CAD software and the engineering education based on classroom lecture in our university cannot respond to the rapid environmental change of the manufacturing industry appropriately. In addition, willingness to study engineering and enthusiasm for manufacturing of university students are vanishing. In order to provide undergraduate students with opportunities to experience the whole process of product manufacturing including three-dimensional computer aided design, computer aided engineering using finite element method and fabrication, Faculty of Environmental Engineering of The University of Kitakyushu attempted the engineering design and manufacturing education by use of 3D CAD and CAE. In this paper, we report the experiences and the results of the educational activities.

著者

Kazuto MIYAWAKI Shigeki MORI Akira SAKURADA Akihiro NAGANAWA Yuki KIMURA Yotsugi SHIBUYA Goro OBINATA

出版者

一般社団法人 日本機械学会

雑誌

Journal of System Design and Dynamics (ISSN:18813046)

巻号頁・発行日

vol.5, no.4, pp.513-522, 2011 (Released:2011-06-20)

参考文献数

13

被引用文献数

1

---

Highly precise positioning control is based on mechatronics. Nanotechnology, especially nanometer positioning technology with high-speed and robust positioning feedback control, is used in various technical fields including measuring systems, magnetic recording and the semiconductor industry. To date, various actuator systems have been proposed, but the structural models have working distance of either less than a millimeter or more than ten millimeters. A structural model with working distance of several millimeters has not been reported in the relevant literature. We propose an actuator structural design that would enable production of actuator systems with such working distances. This actuator has a voice coil motor and a new guide with an elastic support mechanism consisting of a special spring that is restricted to movement in only one direction. This ESM causes no lost motion, friction with motion, or mechanical play. The voice coil motor thrusts and displaces the elastic support mechanism linearly. Therefore, highly precise positioning control can be realized using a simple controller. This paper describes evaluation of the positioning control method from the displacement of ESM and presents basic data for development of future nano-actuator systems.

著者

中川 智皓 竹原 昭一郎 須田 義大

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.75, no.749, pp.74-80, 2009

参考文献数

12

被引用文献数

2 2

---

In this research, the dynamic characteristics of a small wheel bicycle are investigated. The bicycle model is formulated by using multibody dynamics. Then, the stability of bicycles is analyzed by parametric study using the bicycle model. The effects of the parameters of tire diameter and head angle are examined by focusing on a small wheel bicycle. The straight-ahead stability and upstanding stability are evaluated at each parameter. The results show the tendency of stability at each parameter and the influential parameter to the small wheel bicycle is found. The driving experiment using the small wheel bicycle is performed. In the experiment, the stability of the small wheel bicycles with variable head angle is evaluated by the subjects. It is confirmed that varying head angle increases the stability of the small wheel bicycle. The results are corresponding with the simulation results and it is shown that the simulation captures the tendency of the stability and expresses the characteristics of the small wheel bicycle.

著者

日比野 有 下村 隆行 谷藤 克也

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.75, no.758, pp.2605-2612, 2009

参考文献数

9

被引用文献数

2 6

---

In order to verify the validity of "the Detailed Equation" which is a method of static analysis on railway vehicle overturning, we conducted a full scale experiment. The Detailed Equation is an equation of the equilibrium of the forces that act on a railway vehicle, which is similar to an equation for solving the overturning problem of a rigid body, but the external forces and the displacement of the car body are taken into account in detail. Strong crosswind is an important problem for securing the safety of railway vehicles. "The critical wind speed of overturning" or "The wheel unloading ratio" is one of the indices to evaluate the safety of railway vehicles under strong crosswind, and can be obtained by the Detailed Equation. Thus we need to verify the validity of the Detailed Equation. In the full scale experiment, we loaded lateral force (assumed to be crosswind) on the test vehicle, and examined the behavior of the vehicle, such as displacement of the car body and variation of wheel load. As a result, the Detailed Equation has been verified to be valid when we use it for evaluating the critical wind speed of overturning or the wheel unloading ratio.

著者

高野 敦 森永 洋次 井上 登志夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:18848338)

巻号頁・発行日

vol.79, no.800, pp.455-462, 2013 (Released:2013-04-25)

参考文献数

15

---

Methods of evaluating the one-sided tolerance limit (A- and B-basis values) of unbalanced sample sets are derived. The A- and B-basis values are statistically calculated numbers that respectively indicate that at least 99 and 90 percent of the population is expected to equal or exceed the statistically calculated value with a confidence of 95 percent, and they are often used as strength tolerance limits in aerospace designs. The A- and B-basis values tend to be underestimated when the sample size is small and the conventional methods are used. Our novel methods improve the basis values by combining multiple sample sets from normally (Gaussian) distributed populations. We extended analysis of variance (ANOVA) to evaluate the A- and B-basis values by using non-central t-distribution under the condition of equality of variances. In addition, we derive coefficients for the basis values under the condition of non-equality of variances by using a Monte-Carlo method. Numerical examples show that both methods, i.e., equality and non-equality of variance cases, increase the A- and B-basis values.

著者

松田 伸也 黄木 景二

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:18848338)

巻号頁・発行日

vol.78, no.790, pp.912-922, 2012 (Released:2012-06-25)

参考文献数

28

---

This paper presents a probabilistic model for predicting the constant fatigue life (CFL) diagrams for ceramics. First, a unified probabilistic delayed-fracture (PDF) model was proposed on the basis of the slow crack growth (SCG) concept in conjunction with the two-parameter Weibull distribution. Second, probabilistic CFL diagrams for effective volume Veff, effective loading time teffNf, fracture probability F and stress ratio R were obtained using the PDF model. The probabilistic CFL diagram was then related with the modified Goodman's diagram. Third, the unified strength parameters associated with the PDF model were determined using the experiment data of Si3N4 subjected to rotating bending. The stress amplitude - the number of cycles to failure curves were then predicted for R=-1 and 0 and various values of F. Moreover, the probabilistic CFL diagrams for various values of Veff and teffNf at F were depicted using the unified strength parameters. The validity of the present model was confirmed through the comparison of the predicted CFL diagrams with the experiment data.

著者

小林 左千夫 小林 弘樹 池田 弘 橋間 正芳 佐藤 裕一

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.78, no.796, pp.3894-3903, 2012 (Released:2012-12-25)

参考文献数

16

---

In this paper, we present a new thermo fluid simulation method by using reduced-order models, enabling large, real-time, detailed thermal flows with continuous user interaction. Our method is ideally suited for real-time simulation of high-resolution thermal fluid dynamics because our simulator is still fast even in the case of large problems expressed by using more than one million meshes. Our results indicate that one thousand times faster simulation can retain same level of accuracy as conventional methods. In addition, our method provides continuous user interaction in real-time. It allows that we can immediately assess how a thermal field changes when controlling air-conditioning equipment in a data center.