All issues
Volume 74 (2003)
- Issue 4 Pages 221-
- Issue 3 Pages 147-
- Issue 2 Pages 75-
- Issue 1 Pages 5-
Volume 74, Issue 3
Instrument and Control
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
Paper
-
Takao Yabumi, Yoshifumi Morita, Masaki Uchida2003 Volume 74 Issue 3 Pages 147-153
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe development of EMV (Electromagnetics Engine Valve) has received a great deal of attention from the viewpoint of realizing lower energy consumption and lower exhaust gas emission. The reason is that the EMV enables the intake and exhaust valves to move with arbitrary open/close profiles.
This paper presents a high-speed and compact linear actuator using moving-magnet system. In this development, the desired performance is determined by assuming that the linear actuator is used within the limit of the number of engine revolutions of 5000[rpm]. The mechanical structure is designed while repeating the magnetic field analysis from the viewpoint of high energy efficiency. Then, in order to examine the positioning performance, PD feedback control and feedforward control are applied to this system. As a result, the developed linear actuator enables high-speed positioning with the stroke of 7.6[mm] in time of 4[ms] and with the positioning accuracy of 50[μm] which shows that the desired performance is satisfied.View full abstractDownload PDF (258K) -
Toshio Endo, Akira Iida, Shinichi Tanaka, Tutomu Kunitachi2003 Volume 74 Issue 3 Pages 155-160
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSJapan is experiencing a situation where its population demographic is aging more rapidly than any other country in the world. It is estimated that in 15 years a quarter of the total population will be 65 years old or above. With the advent of this aging society, it is important that senior citizens can have a self-sustainable life-style.
In an attempt to assist senior citizens to experience self-reliance, the authors have studied the development of an electric-powered wheelchair in which the user can control the direction of travel by changing the angle of their body. The wheelchair is made full use of the latest sensing and information technologies. We have completed a prototype electric wheelchair that can detect the tilt angle of the user's body by incorporating an acceleration sensor and which controls the directions of travel by employing a personal computer.
Furthermore, after successful trials that have been carried out by senior citizens, we would like to expand our work to practical applications.View full abstractDownload PDF (251K) -
Toshio Endo, Daisuke Hebiishi, Kanju Nakahara2003 Volume 74 Issue 3 Pages 161-166
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe induction heating inspection method is a technique to detect surface defects on billets. When a billet passes through a high-frequency coil, an induced current flows on the billet surface. The current flow will be obstructed by any defects that are present, and the temperature of the areas surrounding the defects will differ from areas that are free from defects due to differences in the current paths. The billet temperature profile can be inspected using an infrared scanner, and consequently surface defects can be detected.
In this study, we report the analytical results of temperature distribution using the finite element method with regard to short defects on the surface of non-magnetic square billets.
The results we obtained are as follows:
(1)In the area of a defect, the shorter the defect, the larger the temperature difference between the defective area and non-defective areas
(2)Joule heating is larger at the edge of a defect than it is in other areas, partly due to concentration of the induced current.
(3)For short defects, the temperature difference between non-defective and defective areas becomes larger with longer heating times.View full abstractDownload PDF (220K)
Review
-
Hisashi Aichi, Minori Kumada, Takashi Kobayashi, Yoshiyuki Sugiyama, K ...2003 Volume 74 Issue 3 Pages 167-172
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe jet-stream blowing over Japan in the high altitude of about 10 km is used to float a platform with a wing tethered with cables. The platform is also lift-ed and held in the altitude with two roters buried in wings. The platform may carry a wind power generator of about 1000 kw, or a transmitter for telecommunication or broadcasting covering a broad area of the ground, and also an environmental watcher by observation of the atmosphere, ground vegetation, traffic, and others. Other applications of the tethered floating platform are suggested for the prevention of lightning discharge and many others like monitoring, survey, and planting of seeds. The characteristics of the platform are described as a new type of useful and economical facility in comparison with the facilities on the ground, artificial satellites in space, and the airship as a stratospheric plat-form projected in Japan and U.S..View full abstractDownload PDF (88K)
Technical Paper
-
Ken-ichi Takata, Taizo Yano2003 Volume 74 Issue 3 Pages 173-178
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSIt is necessary to inspect the surface defects of the billets which are partly finished products to warrant the surface quality. The fluorescent magnetic particle testing is used mostly to detect the surface defects of square non-magnetic steel billets.
Writers have developed the advanced automatic inspection technique of fluorescent magnetic particle testing which uses the multi-CCD cameras. The original high-speed inspection (MG/CCD) system was introduced into the ERBIC(Efficient & Rationalized line of Billet Inspection and Condition) line of Chita Plant in 1993 with the tracking mirror system and the automatic threshold level decision processing.
The further improved system is described in this paper and the view is focused on the equipment composition and the newly developed signal processing.
The detection performance of a scab or a corner part is sharply raised by using eight Megapixel CCD cameras and advanced image-processing technology.View full abstractDownload PDF (531K) -
Ryuzo Yamada, Kenichi Kaneshige2003 Volume 74 Issue 3 Pages 179-184
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSAn ultrasonic flaw detector for newly developed cracking furnace tube for ethylene plant, named PTT, has been developed. PTT is an abbreviation for PPW Technology Tube which is internally overlaid with special combined nickel and chromium alloy by a plasma powder welding method and has features of outstanding anti-coking and anti-corrosion performance. The quality of the overlaid material, discontinuity at the weld interface and thickness of the layer, are inspected automatically by an ultrasonic search unit inserting into the tube in an immersion water tank. The defects which is equivalent to a 1.2mm flat bottom hole sensing is detected by 20MHz ultrasonic wave. The thickness of the base tube is measured with accuracy of 0.24mm by 5MHz ultrasonic wave. Furthermore, the thickness of the layer is calculated by the thickness change of the tube before and after overlayingView full abstractDownload PDF (358K) -
Hiroshi Watanabe, Ryuzo Yamada, Mitsugu Ito, Kiyoaki Niimi2003 Volume 74 Issue 3 Pages 185-190
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe improvement of the straightness of flat bar products such as a tool steel and tube products such as the PPW Technology Tube influences the yield of the succeeding process.
Authors have developed the in-line device to calculate the amount of maximum bending by measurement of the total length profile of flat bars and tubes. Although it was difficult so far for operators to know those bending exactly, e.g. 2 mm bending of a 5m long bar, visually, the device enables to provide the profile of the total length and maximum bending accurately by using non-contact method. The device for flat bars provides the profile in the direction of a top surface and a side surface, and the device for tubes provides the profile of radial displacements and its angles.View full abstractDownload PDF (160K) -
Yoji Ozawa, Takuya Tomatsu, Masahiro Nakagawa, You Suto, Satoshi Shima ...2003 Volume 74 Issue 3 Pages 191-198
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe edge face processing such as edge cutting/correction for small bar steel products is done in DAIDO STEEL Co., Ltd., but the inspection trouble and productivity lowering occurs sometimes, because the inspection of molding quantity and bending quantity has been made by eye conventionally. Authors have succeeded in developing the in-line automatic sensing device for molding/bending inspection and edge-face scale remainder inspection by the optical method, and have obtained the following inspection performance.
(1) Edge cutting quantity/bending quantity measurement accuracy: ±0.2mm or less
(2) Scale-remainder-rate measurement accuracy: ±1% or less
(3) Evaluation of cutting flaw, cutting burr and scale remainder
This device is introduced into CHITA plant, DAIDO STEEL Co., Ltd., and is well utilized for the automatic edge shape inspection and also for the control means of a cutting machine/a bending correction machine.View full abstractDownload PDF (568K) -
Setsuya Morino2003 Volume 74 Issue 3 Pages 199-204
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSTo accelerate the utilization and recycling of sludge of which amount has been increasing year by year, it is necessary to provide various forms of sludge which meet the user's needs.
Carbonized sludge closely resembles charcoal. Due to its original feature that is not found in the melting slag and ash, it is usable in a wide variety of ways as gardening soil, soil improvement material and dehydrating agents. We have started the development of this Carbonization Treatment system to manufacture the carbonized sludge in 1996.
After basic research and demonstration testing, two commercial plants are smoothly operating now. The nature of sludge is influenced by sewage treatment plants and seasons. This report introduces the control system on the Carbonization Treatment System to make good Carbonized sludge against various disturbance.View full abstractDownload PDF (149K) -
Kazunori Tabata, Kenji Sakamoto2003 Volume 74 Issue 3 Pages 205-210
Published: July 15, 2003
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSChita Plant in DAIDO STEEL Co., Ltd. is a consistent special steel making plant based on the order-received production in many kinds and small lot.
The melting plan has been managed by the production planning section of Chita Plant. This planning process makes the operation plan of melting and blooming process on the basis of the rolling schedule of products. Also finally it gives the instructions to the manufacturing process.
This procedure was the big burden for the person in charge, because it needs know-how, experience, and many working hours.
On the other hand, the recent computer technology such as Windows application enables to enhance the operability and expression capability that were impossible in a conventional main frame cheaply. The information sharing also became easy by upgrading the network environment such as LAN.
From such a background , the project that improves the melt planning process was planned in 1999, to cut down personnel cost and to cut work time. "The Charge Management System" that almost covers the whole process was completed in 2002.
This report introduces the system outline, the view of a system configuration , and also the development approach in the small scale system based on Object-Oriented theory.View full abstractDownload PDF (244K)
- |<
- <
- 1
- >
- >|