Gas Turbine Maintenance Technologies SAKAI Yoshiaki / SAWA Tetsu / OKAMOTO Hiroaki The number of gas turbine combined-cycle plants is increasing in line with the market demand for environmental preservation and improvement of energy efficiency. Since the hot gas parts of a gas turbine are susceptible to damage such as thermal stress cracks and hot oxidation, such parts must be constantly repaired or replaced. As a result, efforts have been made around the world to develop gas turbine maintenance technologies, including diagnostics and advanced repair technologies. Toshiba has been developing life assessment technologies, long life technologies, diagnostic technologies, and various other technologies for gas turbine maintenance. Low-Noise Fully Enclosed Type Traction Motors NODA Shinichi / SHIRAISHI Shigetomo / NAGAYAMA Takashi Toshiba has been developing fully enclosed type traction motors under a program with the concept of "traction systems harmonized with nature." A technical objective of these efforts is to realize a structure that can efficiently cool the heat generated inside the motor due to its enclosed design. In the present work to develop low-noise fully enclosed type traction motors, the noise of the outer fan was studied. The irregular-pitch blades of the fan and blade form were improved, and acoustic noise was reduced by 10 dB (A). The cooling structure of the motor was also optimized by heat-flow simulation. As a further measure to solve the temperature issue, a cooling unit was adopted that utilizes the air flow while the motor is running. Sealing of the fully enclosed type traction motor provided a 21 dB (A) reduction in acoustic noise. C-Band 150 W-Class GaN Power HEMT MATSUSHITA Keiichi / SAKURAI Hiroyuki / TAKAGI Kazutaka Toshiba has succeeded in developing a C-band GaN power high-electron-mobility transistor (HEMT) device with an output power exceeding 150 W. This was achieved by taking advantage of our accumulated GaAs-related technologies; namely, our expertise in semiconductor process technologies and in-depth knowledge of wafer structures and internal matching. A peak output power of 174 W at 6.0 GHz was obtained in a prototype test. Business Document Checking System for Compliance IWATA Seiji In recent years, compliance-oriented corporate management has become increasingly important to cope with the various risks to which companies are exposed, and the establishment of various laws and regulatory systems has been promoted in this area. Toshiba Solutions Corp. has developed a business document checking system that checks the contents of a document on the basis of related regulations, in-house rules, and business knowledge and know-how. If any inappropriate item is found, the system will point it out. If the contents of the document contain any risk factor, the system will notify the supervisor accordingly. The quality of the document is also improved in this process. For compliance, it is essential to prepare correct documents concerning business activities. The business document checking system supports this objective. ER-C300 Steam Convection Microwave Oven TAKEI Tamotsu / OKAMURA Yoshio / TAKAHASHI Yuki Toshiba has introduced the ER-C300 steam convection microwave oven as a 130th-anniversary model. The ER-C300 features a new steam unit that is capable of generating superheated steam. This model has the following cooking systems: (1) three types of healthy and appetizing cooking selectable with oven cooking, offering a combination of stone convection and superheated steam cooking; (2) healthy cooking with superheated steam; and (3) full-fledged steam cooking with a large volume of steam. Reliability Analysis of Online Trading Systems TAKEZAWA Nobuhisa / OKUDA Hiroaki / SAKUMA Akira The online trading system of a securities company is a complicated large-scale information system. Since the failure of such a system will cause serious economic loss, high reliability must be maintained. Hence, from the standpoint of enterprise risk management, it is important for enterprises in this business field to evaluate and improve the reliability of their online trading systems. Toshiba Corp. and Toshiba Solutions Corp. are developing a reliability assessment and management method for information systems applying probabilistic safety assessment (PSA) techniques used in nuclear power plants. This method is capable of quantitatively evaluating the reliability of an online trading system in terms of both hardware and software. It is therefore effective for the examination and evaluation of reliability improvement measures. |