研究者業績

曄道 佳明

テルミチ ヨシアキ  (Terumichi Yoshiaki)

基本情報

所属
上智大学 理工学部機能創造理工学科 教授
(兼任)上智大学長
学位
工学士(慶應義塾大学)
工学修士(慶應義塾大学)
博士(工学)(慶應義塾大学)

研究者番号
50262118
J-GLOBAL ID
200901003632307095
researchmap会員ID
1000185286

 学位論文では、(1)非定常性および非線形性を考慮に入れた分布定数系と集中質量系との連成振動系、の研究を、またその後、(2)時間遅れを伴う自励振動系、(3)マルチボディのダイナミクスと制御、の研究を中心に行ってきた。その題材は、超高層用エレベータ、工作機械、高速鉄道車両、深海探査システムなどである。
(1)非定常性および非線形性を考慮に入れた分布定数系と集中質量系との連成振動に関する研究
 学位論文である「超高層用エレベータにおけるロープ・キャブ系の振動に関する研究」と題されたこの研究課題では、上端が水平加振されるロープおよびエレベータ・キャブから成る系を、長さが変化する弦と移動を伴うばね・質量系との連成振動系でモデル化し解析対象としている。長さが変化することを考慮したロープの非定常振動について、非線形時間尺度の導入により解析的近似解を導出し、ロープの共振点通過現象の物理的解釈を示した。
(2)時間遅れを伴う自励振動に関する研究
 本研究課題では、主に2つの解析対象について研究を行ってきた。一つは、円筒プランジ研削における自励振動の発生機構についてであり、いま一つは、鉄道レールにおけるコルゲーションの発生機構についてである。円筒研削における自励振動は、再生作用による励振機構を持つが、加工物回転速度に着目した自励振動の発生機構、持続機構をそれぞれ明らかにした。
 一方、鉄道レールにおけるコルゲーションにおいては、発生および成長のメカニズムを知る上で、車輪通過時の車輪、レール間の接触力変動を把握することが不可欠となる。車輪が通過する際に、前輪および後輪の振動の相互作用を明確にし、特に後輪が接触力変動に対して、抑制的に作用するのか、増長的に作用するのかという点を明確にした。また、実験装置を作製し、柔軟軌道上に発生するコルゲーションの特徴を明確に指摘した。
(3)マルチボディのダイナミクスと制御に関する研究
 各種構造物の軽量、柔軟化に対応するために、柔軟構造物の動的解析および制御に関する手法の開発が大きな課題となっている。特に、系のフレキシビリティの考慮や、制御系としての検討、および後述するような剛体の移動を伴う柔軟構造物の取扱いなどにおいて多くの検討の余地が残されており、今後益々その研究意義は増すものと考えられる。
 車輪・レール系の挙動を、フレキシブルマルチボディシステムとして捉え、柔軟構造物上

講義では、学部生向けに機構学を担当していますが、特に機構の運動学、動力学の基礎に重点をおき、大学院で扱うマルチボディダイナミクスを視野に入れた内容に配慮しています。また、これから必要な設計、制御などへの融合的課題についても事例紹介を心がけています。
研究では、現在鉄道システムの運動解析、テザーシステムの運動解析と制御を重点的に行っています。共に、マルチボディダイナミクスの先端的課題を包含しており、学内外での共同研究も行っています。

(研究テーマ)
機械振動におけるパターン形成現象に関する研究
車輪・軌道系の接触力変動に関する研究
テザードシステムの力学と制御に関する研究

(共同・受託研究希望テーマ)
機械振動におけるバターン形成現象に関する研究


論文

 83
  • Daiki Ishihsra, Yoshiaki Terumichi, Shoichiro Takehara
    Vibration Engineering for a Sustainable Future 219-225 2021年4月26日  
  • Yasutaka Maki, Yoshiaki Terumichi
    Computational Methods in Applied Sciences 53 479-486 2020年  
    As the evaluation method for the extent of the damage of the wheel tread of a railway vehicle, the measurement of its length in the rotational direction has been adopted for the decision of the wheel treatment. It is derived from the assumption that the depth of a wheel flat, which is one of the most serious damages, is proportion to its length in the rotational direction. Although the length of a shallow scrape tends to be long, the profile of the wheel with the long shallow scrape has less amount of irregularities compared with an exact circle. Therefore, in order to clarify the effect of the rotating wheelset with the shallow scrape on a bogie, we focused on the behaviour of the rotating wheel with the shallow scrape and evaluated it by dynamic model simulation and bench tests for an actual bogie. By the numerical simulation, we comprehended that the shallow scrape causes the vertical acceleration of the axlebox and the impact force to increase linearly in accordance with the running speed-up, and the vertical acceleration has a local maximum value around 110 km/h in accordance with a decrease in vertical collision velocity of the wheel with the roller in a higher speed range.
  • 原聡, 原聖, 曄道佳明, 谷藤克也
    日本機械学会論文集 86(889) 20-00064 2020年  
  • 原聡, 曄道佳明, 谷藤克也
    日本機械学会論文集 85(878) 19-00091 2019年  
  • 真木康隆, 曄道佳明, 山本勝太, 池内健義
    日本機械学会論文集 85(875) 19-00003 2019年  

MISC

 92
  • 川井 郁人, 竹原 昭一郎, 曄道 佳明
    日本機械学会関東支部総会講演会講演論文集 2016(22) "OS1303-1"-"OS1303-2" 2016年3月10日  
    In recent years, some systems which contain a floating body, such as Unmanned Aerial Vehicle (UAV) connected with a tether, are used for transportation. However, the coupling motion of the system is not easily predicted with high accuracy and may induce instability of the floating body. Therefore, to control the system, comprehension of the motion of the whole system is of great importance to control the system. In this investigation, modeling and formulation of the tethered system which contains a floating body is presented using Absolute Nodal Coordinate Formulation (ANCF) and the result of the numerical simulation of the motion is discussed.
  • 兜森 正志, 村井 敏昭, 吉岡 博, 曄道 佳明
    鉄道技術連合シンポジウム(J-Rail)講演論文集 2015(22) "2607-1"-"2607-4" 2015年12月8日  
    This paper proposes a method to simulate the primary bending vibration in a test stand consisting of one-third segment car body and a full-scale bogie of magnetically levitated (maglev) vehicles. The purpose of this system is to evaluate an effect of flexural vibration to the ride comfort on maglev vehicles. The system utilizes hardware-in-the-loop simulation (HILS). The HILS system calculates internal forces acting from remaining two-thirds segment car body which is missing in reality, and applies constraint forces equivalent to the internal forces to the one-third segment using electric actuators.
  • HAMAJIMA Toyokazu, NISHIMURA Kazuhiko, TERUMICHI Yoshiaki
    Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH 2015 "1D23-1"-"1D23-12" 2015年11月9日  
    Behavior analysis of a coupled train under crash condition has several difficulties, because a coupled train has structural, mechanical and kinetic aspects. Many kinds of behavior can be observed when longitudinal heavy force is applied to a train set. Such as; vertical train buckling, car body deformation, coupler collapse and overriding. The objective of this study is to clarify the processes and the mechanisms of a train set behavior under these conditions, including impact force. In this study, in order to analyze the train set motion, we developed a numerical simulation model which can simulate dynamic behaviors including structural deformation, mechanical behavior and kinetic motion on a straight track. The numerical simulation model consists of both the structural models which are formulated by FEM (finite element method) and the kinematic models which are based on the MBD (multi body dynamics) theory. In this model, the FEM model was validated by comparison with the results of the collision test using the full scale test car. Simulations with large kinetic displacement and structural deformation under two types of load conditions were conducted by means of this model. One being a low speed heavy load condition, such as a relief operation, and the other a high speed light load condition, such as a collision with a relatively light weight foreign obstacle at very high speed. Large deformation processes and mechanisms data of a train set under wide load conditions ranging from low speed against a heavy obstacle to high speed against a light obstacle obtained from the simulations and experiment are comprehensively clarified.
  • NISHITANI Koichi, TERUMICHI Yoshiaki, MORI Hirotaka, SATO Yasuhiro, TAKAHASHI Katsuyuki, OKA Yasushi
    Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH 2015 "2A12-1"-"2A12-11" 2015年11月9日  
    A restraint on the wear of train wheels and rails of a railway is required to improve running safety and reduce maintenance cost. Wear is one of the problems that need to be settled in managing railway property. In order to deal with this problem, it is fundamental that we understand the mechanism of wear between rail and wheel. For this purpose, in this study an experimental approach to wear development using test stand that has controlled environment with respect to contact parameters and factors influential in causing wear is taken. In the experiments conducted, a 1/5 scaled rolling stock test stand consisting of a wheel set and two rail rollers is used. A comparison was made of the worn wheel surfaces and the creep force under various contact interface conditions such as coefficient of friction and radius of curvature. The contact interface conditions included a dry surface condition and a friction modifier-applied condition, in which low coefficient friction and high positive friction were used as friction modifiers. By studying photographs of worn wheel surfaces and the creep forces under various conditions, the mechanism of wear development at the rail/wheel contact point is examined. In particular, we clarify the influence of the creep force on the wear coefficient and the status of the worn wheel surfaces.
  • KUNIMATSU Yuki, TERUMICHI Yoshiaki
    Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH 2015 "1D25-1"-"1D25-7" 2015年11月9日  
    One method to evaluate the running stability of railway vehicles is a running test on roller rigs. In this study, we carried out running tests in order to investigate the differences in the dynamic behavior of half-body and full-body vehicle models on roller rigs in frequency response tests with vertical and rolling forced excitations. By means of a vehicle dynamics analysis by computer simulation, we evaluated the influence of the center of gravity of the body on the dynamic behavior of the vehicle. As a result, it was verified that, for both vertical and rolling forced excitations, when the gravity position of body is equal to the center of body, the dynamic behavior of the full-body vehicle model is nearly the same as that of the half vehicle model in the each excited direction. Otherwise, the dynamic behavior of the full-body vehicle model is different to that of the half vehicle model, because of a pitching movement of the body in the case of vertical forced excitations and a rolling and yawing movement of the load frame in the case of rolling forced excitations.

書籍等出版物

 4

共同研究・競争的資金等の研究課題

 6