著者

佐伯 一夢 深尾 隆則 浦久保 孝光 河野 敬

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.798, pp.236-251, 2013 (Released:2013-02-25)

参考文献数

25

被引用文献数

1

---

A surveillance system has been required to gather information after large-scale disasters on stricken areas safely and quickly. To collect the information, it is useful to use a blimp, because of its low-sky availability, safety and long flight. A blimp flying at low altitude can capture high quality images offering 3D imagery in disasters. This paper proposes a new path following control method for outdoor blimp robots under windy conditions to collect detailed disaster information. The method consists of path following control in the wind coordinate on the horizontal plane and altitude control on the longitudinal plane. And this method minimizes the lateral errors arising from the wind disturbances considering path regeneration. Some simulations and experiments for a 12m class blimp are performed to confirm the usefulness of the proposed method.

著者

長山 格

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 (ISSN:21879761)

巻号頁・発行日

vol.82, no.838, pp.15-00278-15-00278, 2016 (Released:2016-06-25)

参考文献数

23

---

This paper describes a high performance parallel image retrieval system for mechanical drawings management. The system is designed with PC-cluster that consistes of one master node and eight slave nodes. In order to achieve a higher performance, parallel processing and precise searching process are introduced to the proposed system. The parallel processing uses many rotated templates of a target symbol to perform pattern matching by each slave node. The precise searching is newly designed by analyzing our previous study for image retrieval of mechanical drawings. Object detection in many kind of images continues to be one of the most common application for image processing and understanding. We first discuss some essential issues to be considered conventional object detection with large digital images. Experimental results by using the proposed system are also described. The good performance of the system is shown.

著者

野中 紀彦 岩崎 富生 守谷 浩志 谷江 尚史 池田 靖

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 (ISSN:21879761)

巻号頁・発行日

vol.81, no.824, pp.15-00018-15-00018, 2015 (Released:2015-04-25)

参考文献数

31

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A Kriging-based method for efficiently searching materials was used to select additive elements in lead-free solders that are effective for suppressing the grain-boundary diffusion, which is the cause of smaller breaking elongation than lead-contained solders. By using the idea of the L9-orthogonal-array design methodology, we selected nine combinations of additive elements, and investigated the dependence of diffusion coefficients on four parameters (the atomic radius of the 1st additive, the cohesive energy of the 1st additive, the atomic radius of the 2nd additive, and the cohesive energy of the 2nd additive). The diffusion coefficients were calculated by using molecular-dynamics simulations. The calculation results showed that the diffusion can be suppressed when the atomic radii of the 1st and 2nd additives are close to that of tin (Sn), and when the cohesive energies of the 1st and 2nd additives are smaller than that of tin. According to these conditions, we found that two additives selected from silver (Ag), indium (In), and bismuth (Bi) are effective for suppressing the diffusion and for increasing the breaking elongation. Because these results were confirmed by tensile deformation test, the Kriging-based method is considered to be practical for effectively searching materials.

著者

長山 格

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 (ISSN:21879761)

巻号頁・発行日

2016

---

This paper describes a high performance parallel image retrieval system for mechanical drawings management. The system is designed with PC-cluster that consistes of one master node and eight slave nodes. In order to achieve a higher performance, parallel processing and precise searching process are introduced to the proposed system. The parallel processing uses many rotated templates of a target symbol to perform pattern matching by each slave node. The precise searching is newly designed by analyzing our previous study for image retrieval of mechanical drawings. Object detection in many kind of images continues to be one of the most common application for image processing and understanding. We first discuss some essential issues to be considered conventional object detection with large digital images. Experimental results by using the proposed system are also described. The good performance of the system is shown.

著者

藤川 正毅 石川 清貴 真壁 朝敏 田中 真人 笹川 崇 表 竜二

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 (ISSN:21879761)

巻号頁・発行日

2016

被引用文献数

2

---

This paper presents a novel Formulated Alpha FEM with deviatoric / volumetric split, which is combination of standard FEM and Node-based Smoothed FEM (NS-FEM), to compute highly accurate deformation in mechanical problems using tetrahedral elements. The essential idea of the method is the use of a deviatoric alpha formulated on basis of the results of cantilever problem, and the volumetric alpha introduced NS-FEM. The features of this proposed method are: 1) immune from volumetric locking, 2) less sensitive to element distortion, and 3) to be carried out with the same preprocessing as standard FEM from user's viewpoint. Several numerical examples show that the present method achieves higher accuracy compared to the standard FEM and Edge-based/NS-FEM which is known to be one of the best S-FEM formulations.

著者

平島 健一 杉坂 憲明

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:03875008)

巻号頁・発行日

vol.60, no.575, pp.1557-1563, 1994-07-25 (Released:2008-02-21)

参考文献数

4

被引用文献数

1 5

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This paper presents a unified analysis of isotropic out-of-plane shear problems containing two circular elantic inclusions and shows the analytical solutions. The applied forces considered in this paper are longitudinal shear stress at infinity, concentrated force, screw dislocation, dipole force, dipole dislocation and distributed forces, at arbitrary positions. The analysis is based on the complex variable method using the Mobius transformations by Honein and Herrman. Several numerical examples are given by graphical representations.

著者

長山 格

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 (ISSN:21879761)

巻号頁・発行日

pp.15-00278, (Released:2016-06-10)

参考文献数

23

---

This paper describes a high performance parallel image retrieval system for mechanical drawings management. The system is designed with PC-cluster that consistes of one master node and eight slave nodes. In order to achieve a higher performance, parallel processing and precise searching process are introduced to the proposed system. The parallel processing uses many rotated templates of a target symbol to perform pattern matching by each slave node. The precise searching is newly designed by analyzing our previous study for image retrieval of mechanical drawings. Object detection in many kind of images continues to be one of the most common application for image processing and understanding. We first discuss some essential issues to be considered conventional object detection with large digital images. Experimental results by using the proposed system are also described. The good performance of the system is shown.

著者

大場 啓介 長嶺 拓夫 森 博輝 佐藤 勇一

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 (ISSN:21879761)

巻号頁・発行日

pp.14-00593, (Released:2015-02-24)

参考文献数

8

---

This paper describes the investigations of the characteristic about the sound generation of a nose flute experimentally. The nose flute is attached to the upper part of a container. If air is passed to a nose flute, sound will occur. The volume of a container is changed and the generated sound is measured. The natural frequencies of an experimental device are calculated and we confirm that it is in agreement with frequency of sound generated in experiment. We show that nose flute is a unique musical instrument with the point that a nose flute has only an edge part and uses people's mouth for a resonance body part. The frequencies of resonance sound can be calculated from the capacity in a mouth, the thickness and the area of an opening of a nose flute. When people play a nose flute, it is thought that only the first mode of vibration is used.

著者

萩野 直人 吉田 博夫 今田 晴彦

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 (ISSN:21879761)

巻号頁・発行日

pp.15-00596, (Released:2016-04-25)

参考文献数

16

被引用文献数

1

---

The self-circulating thermosyphon (SCTS) operates without external pumping power. It is a closed loop of pipe and consists of heater, condenser, heat exchanger and recuperator. In this paper the basic performance of SCTS was examined experimentally under various back ground pressures and power inputs to the heater. Experimental results showed that the stable operation of SCTS was limited by the minimum input power overcoming the total losses of the system and the maximum power within the ability of the condenser. At fixed back ground pressure, mass flow rate and quality of water vapor in heater were confirmed to increase with the power input. As back ground pressure increased, mass flow rate was prone to decline. Those suggest that the main driving force of SCTS is buoyancy force of the vapor. Thermal transport efficiency ranged from 0.4 to 0.9 as far as the present conditions are concerned.

著者

長江 信顕 後藤 知伸

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.803, pp.2314-2328, 2013 (Released:2013-07-25)

参考文献数

10

被引用文献数

1

---

The predictive accuracy for the dynamic behaviour of a rotor under conditions of high-speed spinning depends on the accuracy of the numerical model of the rotor, the dynamic characteristics of the bearings and/or the seals, and the external force. In order to improve the accuracy of the numerical model, we propose a method to identify all characteristic matrices in the vibration equation of a rotor based on the information on rigid and elastic properties which can be obtained by a vibration test without spinning. The rotor is assumed to be composed of a shaft which can be modeled as beam elements and rigid discs. The proposed method can be applied for model reduction in which the reduced number of beam elements is feasible to calculate the dynamic behaviour of the rotor.

著者

村岡 祥雄 関 研一 西村 秀和

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 (ISSN:21879761)

巻号頁・発行日

vol.82, no.835, pp.15-00480-15-00480, 2016 (Released:2016-03-25)

参考文献数

15

---

Thermal design of electronic products has become increasingly complicated with leakage current characteristics and their variation of semiconductors. This paper proposes an application of a thermal system model to a production system of electronic products. The thermal system model is developed for architecture design to determine design parameters of modules. The model is described with Systems Modeling Language (SysML) considering interactions among parameters of mechanical structure and electrical components that include semiconductors with temperature-dependent leakage current characteristics. In the system model, constraints of heat generation and heat transfer are described using equations and relation between equations and parameters are clarified in parametric diagram. The system model that is developed at the early stage of product design is used at the beginning of integration, such as receiving inspection. To prevent quality degradation by variation in component characteristics, semiconductor components such as processing units are screened with thermal simulation result before their implementation on Printed Wiring Board (PWB). The simulation result is being referred to temperatures that cause low-temperature burn injury. As a case study, a system model of portable product is developed and demonstrates thermal simulation to determine limitation in large variation in leakage current characteristics to satisfy product thermal quality. To improve yield ratio of the semiconductor components after screening, system models are developed for various products in which same processing units are installed. The system model can be applied for each product changing the design parameters and simulate to determine allowable range of component characteristics keeping the product quality. Implementing a component that causes more leakage effect into a product that has more allowable range, degradation of product quality can be avoid without losing the component yield ratio.

著者

西 義久 木下 泉 西村 聡

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.70, no.691, pp.715-722, 2004-03-25 (Released:2011-03-03)

参考文献数

17

被引用文献数

2

---

The experiments about the gas lift pump in lead-bismuth eutectic are performed with risers of three kinds of diameters [φ 69.3 mm (SD case), φ 106.3mm (MD case), φ 155.2mm (LD case)]. The main results are as follows : (1) The coefficient of the drift flux model was derived from the experimental results. (2) The LBE flow rate obtained from the design method based on water/gas system with the relation of the drift flux model corresponds to the experimental results obtained in the MD and the SD cases. It is considered that the evaluation method can be used for the LBE gas lift pump in a small diameter riser. (3) In the LD, the design method excessively evaluates the lead-bismuth circulating flow rate. It thought that the circulation head will not occur in the experimental loop. The following factors are considered to be the causes of this the three-dimensional behavior of bubbles becomes significant, and the local descending flow is generated in the riser when the riser diameter increases.

著者

佐藤 建吉

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.74, no.746, pp.2411-2417, 2008-10-25 (Released:2011-03-04)

参考文献数

9

---

The father and son, Marc Isambard Brunel and Isambard Kingdom Brunel, were well known as the great engineers of England in the 19th century. They were worked in the fields of mechanical and civil engineering, which were broadly developed in the post-industrial revolution age. Marc, the father, engaged in his jobs that were relating to over twenty his patents. Isambard, the son, also engaged innovatively in the wider fields by denying the system of patent. In this paper, firstly, the engineer's spirits of the father and son have been discussed, and secondly, the above clear difference between their views on patents has been discussed. The aim of this paper is to give a chance to think how today's Japanese engineers should behave toward patents and the patent system.

著者

藤川 正毅 石川 清貴 真壁 朝敏 田中 真人 笹川 崇 表 竜二

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 (ISSN:21879761)

巻号頁・発行日

vol.82, no.834, pp.15-00454-15-00454, 2016

被引用文献数

5

---

This paper proposes a novel implementation scheme of geometrically nonlinear finite element programs, which automatically compute exact internal force vectors and element stiffness matrices by numerically differentiating a strain energy function at each element. This method can significantly simplify the complex implementation procedure which is often observed in conventional finite element implementations, since it never requires B matrices, stress tensors, and elastic tensors by hand. The proposed method is based on a highly accurate numerical derivatives which use hyper-dual numbers and never suffer from any round-off and truncation errors. Several numerical examples are performed to demonstrate the effectiveness and robustness of the proposed method.

著者

植月 啓太

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.118, no.1163, pp.636-639, 2015

著者

佐脇 豊 伏谷 裕士 徳田 正孝 八木 一夫 稲葉 忠司 関岡 清次 中野 赳

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:03875008)

巻号頁・発行日

vol.63, no.611, pp.1533-1538, 1997-07-25 (Released:2008-02-21)

参考文献数

19

被引用文献数

2 3 8

---

Stress distributions in a canine left ventricular wall are simulated during one cardiac cycle by employing 3-dimensional finite element models developed in order to estimate the functions of the left ventricle. The appropriateness of the numerical simulator is examined by comparing the pressure volume relationships of the left ventricle computed by the present system with those obtained by the corresponding canine experiments. The initial geometry of the left ventricle is assumed to be a prolate spheroid in order to facilitate easy estimation of the complex computed numerical results. It is recognized that the distributions of the wall stress, e.g., the circumferential stress, near the equatorial surface are quite different from those of the thick cylinder subjected to the internal pressure and that the magnitudes and the directions of the principal stresses are closely related to both the contractility and the orientation of the myocardial muscle fiber.

著者

小久保 慎弥 北岡 雅哉 坂本 二郎 不島 健持 小林 優

出版者

一般社団法人 日本機械学会

雑誌

年次大会

巻号頁・発行日

vol.2012, pp._J025022-1-_J025022-4, 2012

---

In orthodontics medical treatment the diagnostic system which simulates movement of the tooth by orthodontic force is required in order to perform orthodontics medical treatment more easily for a short period of time. In this research, teeth finite element model in consideration of the mechanical property of the periodontal membrane was developed and the simulation procedure of the bone resorption which occurve in an alveolar bone was proposed. As a result, it was ensured that teeth finite element model considering the characteristic of the periodontal membrane was effective. By using a bone resorption simulation procedure, the possibility of representation of the bone resorption in an alveolar bone was sugested.

著者

佐藤 範和 竹内 伸太郎 梶島 岳夫 稲垣 昌英 堀之内 成明

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:18848346)

巻号頁・発行日

vol.79, no.803, pp.1219-1231, 2013 (Released:2013-07-25)

参考文献数

13

被引用文献数

1 1

---

A new discretization scheme of a Cartesian grid method for flow with heat transfer is proposed. The energy transport equation is discretized directly even in the boundary cells involving either the Dirichlet (isothermal) or the Neumann (iso-heat-flux/adiabatic) boundary conditions in order to ensure the energy conservation in those cells. The basic idea of this discretization is the same as the discretization scheme which is previously proposed by the present authors for boundary forcing in incompressible flow simulations. Moreover, the temperature gradients in both the normal and tangential directions at boundaries are required in the present method for representing the Neumann boundary condition on the Cartesian grids which do not necessarily coincide with the body geometries. The tangential components of the temperature gradients at boundaries are calculated by the extrapolations from the surrounding temperature field. Accuracy evaluations are conducted in a convective heat transfer problem in a flow between concentric cylindrical walls under the several different types of thermal boundary conditions applied at the inner and outer walls. It is confirmed that the present method significantly improves the accuracy orders for the temperature as well as the error magnitudes under both types of thermal boundary conditions. In particular, because the temperature gradients are correctly considered at the boundary cells where the Neumann boundary conditions are enforced, the same level of accuracy order is also maintained even in cases of non-uniformly distributed temperature at those boundaries.

著者

片峯 英次 今井 伸哉

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 (ISSN:21879761)

巻号頁・発行日

pp.15-00578, (Released:2015-12-24)

参考文献数

21

被引用文献数

1

---

This paper presents a numerical solution to shape identification of unsteady natural convection fields to control temperature to a prescribed distribution. The square error integral between the actual temperature distributions and the prescribed temperature distributions on the prescribed sub-boundaries during the specified period of time is used as the objective functional. Shape gradient of the shape identification problem is derived theoretically using the Lagrange multiplier method, adjoint variable method, and the formulae of the material derivative. Reshaping is carried out by the traction method proposed as an approach to solving shape optimization problems. Numerical analyses program for the shape identification is developed based on FreeFem++, and the validity of proposed method is confirmed by results of 2D numerical analyses.

著者

米倉 一男 寒野 善博

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 (ISSN:21879761)

巻号頁・発行日

pp.15-00337, (Released:2015-12-04)

参考文献数

24

---

We propose a Newton-gradient-hybrid optimization method for fluid topology optimization. The method accelerates convergence and reduces computation time. In addition, the fluid-solid boundaries are clearly distinguished. In the method, the optimization process and flow computation are executed concurrently. The flow computation utilizes the lattice Boltzmann method (LBM), and the optimization algorithm partly utilizes a Hessian matrix. Due to the formulation of LBM and the optimization algorithm, the Hessian matrix is a diagonal matrix. Since the optimization problem is nonconvex problem, the Hessian matrix is not generally positive semidefinite. Hence, we employ a gradient method for a component whose corresponding Hessian matrix elements are negative. We compare the optimization results with those of conventional gradient method and show that the convergence is accelerated and the fluid-solid boundaries are clearly distinguished.