Vol.39 No.1
Original Papers
Development of a VR-Type Linear Stepping Motor and the
Construction of a Practical Training System Related to its Control Circuits
Hiroshi SHIRAHAMA
VR型リニアステッピングモ−タの開発と制御回路実習装置の製作
白浜 博
Electromechanical Technology Education (ETE) is currently focused on software
education. This study, however, is based on the point of view that a well-balanced
education combining hardware and software technologies is indispensable.
This study developed a practical training and teaching system using stepping
motors with the intention of introducing a hardware component into (ETE).
Specifically, (1) a VR-type linear stepping motor was developed, and (2)
various excitation pulse pattern signal generators were made to function
as its control circuits, along with other devices that were manufactured
for its system configuration. This study demonstrated the following things
can be taught: (1) the structure of a rotary stepping motor, (2) its operating
principle, and (3) the behavioral differences between various excitation
systems.
Key words: Electromechanical Technology Education, hardware technology,
software technology, VR-type linear stepping motor, various excitation
pulse pattern signal generators
A Conceptual Framework for Fostering Operational Ability
in Technology Education.
Yoshimi KONDO
技術科教育における操作能力形成の概念的枠組み
近藤 義美
Within technology education as general education, teaching methods have
been studied and classes have been conducted with the objective that students
learn how to perform specific operations efficiently. However, fostering
operational ability in technology education should not only be about learning
the operation of every tool or machine, we must broaden it and include
forecasting and planning activities which are characteristics of human
behavior. In order to achieve this the following points need to be considered.
Regarding the objectives of the class, it is necessary to clearly define
the levels and characteristics of mastery. During the process where students
learn the operation of each machine and tool, each one should be involved
in forecasting and planning. Then students should meet in small groups
or as a class and engage in discussion in order to clarify what they have
learned. Exams should be used for further clarification and if necessary
opportunities should be provided in order to make corrections. From this,
students acquire the behavior patterns of feedback and input. In order
to make forecasting and planning possible we must evaluate the targeted
operation using a means - objective analysis and then synthesize what was
learned in previous operations. This paper demonstrated the conceptual
framework for the formation of operational ability.
Key words: operational ability, process of class, forecasting and planning,
feedback, input.
A Butterworth Bandpass Filter Using Mutators
Susumu KITAMORI
ミュ−テ−タを用いたバターワース帯域通過フィルタ
北守 進
In this paper a LC simulation-type RC active bandpass filter was presented.
The proposed circuit simulated the doubly terminated ladder filters. To
begin with, a second-order Butterworth bandpass filter was designed. Further,
L-R mutators were shown to be useful in synthesizing a ground inductor
and a floating inductor.
Key words: Mutator, ground inductor, floating inductor, Butterworth filter,
Bandpass filter
Stresses and Deformations of Curved Tubes which have a
"D" Type Cross Section
Yasuhiro TOMINAGA, Shiga Prefectural Junior College.
Ｄ形断面をもつ曲り管の応力と変形
富永 泰弘
The purpose of this study was to analyze the experimental results related
to variations in the stresses on the walls of thin wall curved tubes and
the variation in the deformation of the tubes whose cross sections were
"D" shaped. The specific example was a Bourdon tube. This study
compared the mechanical characteristics of strength and deformation between
curved tubes with "D" shaped cross sections and those with other
types of cross sections (such as: thin wall flat-oval cross sections and
elliptical cross sections). The stress distributions on the walls of the
tubes had complex dynamic combinations, because the tubes were comparatively
flat and had relatively thin walls. Therefore, these experiments were carried
out by measuring stresses on the walls of these tubes using strain gauges
pasted on the walls. The experimental result were as follows: The displacement
of the tube ends and the maximum stresses of the thin wall Bourdon tubes
with the "D" cross section, the flat-oval cross section and the
approximately elliptical cross section (nearly pointed-arc cross section)
were influenced by the height-to-width ratio of the tube cross section,
the thickness of the wall, the radius of the tube, the tube angle, the
material and the curvatures of arcs of both ends which are the major axis
and the minor axis of the tube cross section.
Key words: Bourdon tube, wire strain gauge, stress distribution, deformation,
cross-sectional form
Analysis of Stress Distribution in Simple Glued Lap Joints
under Shear Load
Satoki Kohno, Okitsugu Sakata,Akira Kikuchi, Kazutoyo Kawano,Yoshibumi
Kinoshita, Kohichi Miyashita
せん断荷重下の単純重ね接着継手における応力分布の解析
河野 聡樹，坂田 興亜，菊地 章，河野 和豊，木下 凱文，宮下 晃一
This study used the Finite Element Method, modeled after shear load tension
tests of simple glued lap joints, to analyze the stresses on the joints.
By investigating the area of stress concentration, this study analyzed
the characteristics and problems of this test. First, because of the way
the joints were formed, when the joints were placed under a constant shear
load, bending moment occurred and unique deformation characteristics resulted.
The study showed that it was necessary to make the support portions as
long as possible and the indented portions (which were not overlapped)
as short as possible; this minimized the bending moment effects and made
it possible to obtain comparatively pure shear strength results. Second,
after analyzing the relationship between adhesive thickness and stress
distribution we found that, (1) stress concentrations primarily existed
at the both edges of the adhesive layer, (2) the stress concentration was
greatest near the adhesive/adherent interface, and (3) in order to avoid
stress concentration the adhesive layer should be thicker. The same investigation
was undertaken to determine changes in Young's Modulus Ea related to adhesives.
The results indicated that the smaller the Ea the greater the stress distribution.
Further, the change in t and Ea, when considering the surface elasticity
and stiffness of the joint, indicated that the same effects were produced
in terms of stress concentration.
Key words: Adhesive Joint, Shear Test, Finite Element Method, Bending Moment,
Adhesive Layer Thickness, Young's Modulus
Preventing the Loosening of Threaded Joints Under Transverse
Vibration Using Anaerobic Adhesives
HISAMITSU Nobuyoshi, OGAWA Takenori, TOKITOU Masashi
軸直角振動を受けるねじ締結体の嫌気性接着剤によるゆるみ防止
久光 脩文，小川 武範，時任 真志
The effect of anaerobic adhesives in preventing the loosening of threaded joints was tested under transverse vibration. The critical slip amplitude was compared for the fastened parts and the threaded joints which were lubricated with machine oil on both the mating threads and the bearing surface of nut. Conclusion: The anaerobic adhesives were found to be effective for preventing loosening caused by transverse vibration as well as rotational vibration. The critical amplitude can be estimated by using the fastening force which is obtained as a sum of the actual tightening force and the additional force due to the effect of adhesion.
Practical Papers
The Development of a Measurement and Simulation System for Assisting with
the Design of a Mono-Transistor Amplifier in Technology Education.
Hirotaka DOHO and Kunio UEDA
技術科教育におけるトランジスタ増幅回路設計のための 計測・シミュレーションシステムの開発・
道 法 浩 孝，上 田 邦 夫
Using a computer, we developed teaching materials to assist students to
learn how to design transistor amplifiers that are based on the transistor's
collector characteristics. Using this system, the student measures the
transistor's data, processes the measured data, draws its collector characteristics,
and simulates the movement of the mono-transistor amplifier. Through the
utilization of this system in Technology Education "Electronics"
classes, students designed the most suitable amplifier by setting up the
circuit constant that matched each transistor. Under different conditions,
doing circuit design in a limited time, after 4 or 5 repeated trial and
error simulations, the students were able to understand the method of designing
amplifier circuits using the transistor's collector characteristics. They
were also able to understand the function of the circuit elements and the
relationship of the elements as a whole. At the same time, this activity
has been recognized to have a positive emotional impact on students.
Key words : Electronics, teaching materials, transistor amplifier circuit,
transistor's collector characteristics, computer simulation.
Technical Information
CAI for Machine Design - Design of Hand Winches
Satoshi EMA，Hiroaki ODAKA
機械設計用ＣＡＩに関する研究 − 手巻きウインチの設計 −
江馬 諭，尾高 広昭
To acquire basic knowledge related to design methods, design procedures
and drawing exercises have been done related to machine design and drafting.
However, there are many problems which require improvement related to conventional
practices. Using hand winches as the subject matter, CAI software for machine
design was developed which would allow for such things as: the reduction
of design time, confirmation of student designs, repeating designs, appropriate
guidance for each drafting project, and designing multiple projects. Furthermore,
this CAI was tested using 27 subjects. As a result, it was confirmed that
this CAI was useful.
Key words: Machine design, CAI, CAD, Questionnaire testing, Evaluation