Tomohiro Naruse

Bio: Tomohiro Naruse is an academic researcher from Hitachi. The author has contributed to research in topics: Bolted joint & Fatigue limit. The author has an hindex of 7, co-authored 43 publications receiving 141 citations.

Heat exchanger for air compressor

Abstract: A heat exchanger used in a screw air compressor has a low temperature chamber through which low temperature fluid flows and a high temperature chamber through which high temperature fluid flows. The low temperature chamber and the high temperature chamber are separated by a partition plate. The high temperature chambers and the low temperature chambers are alternately arranged in layers, so that the low temperature chambers are disposed at both ends in a layered direction. Additionally, the flowing direction of the low temperature fluid in the low temperature chambers and the flowing direction of the high temperature fluid in the high temperature chambers are substantially orthogonal to each other.

Rotor of squirrel-cage electrical rotary machine

Abstract: PROBLEM TO BE SOLVED: To reduce high tensile stresses produced at a conductor bar and the base of an end ring by varying the shape of slits in the axial direction in order to constrain thermal expansion of the conductor bar in the axial direction, forming a projection or recess on the conductor bar in the axial direction, and securing the conductor bar on a core in the axial direction SOLUTION: Slits are enlarged in proximity to an end ring, and a projection 9 is formed on a conductor bar This state of transformation in the conductor bar in the axial direction at this time is constrained by the projection 9, and no gap is produced between the end ring and a core For the reason, bending deformation does not takes place in the conductor bar, and the bar or the base of the end ring is not brought into tensile state With respect to stress distribution at this time, tensile stress on the base is reduced Rather, compressive stress is exerted by flexion in the end ring being restrained The projection on the conductor bar can be easily formed by only integral molding, using aluminum die casting COPYRIGHT: (C)1998,JPO

About the thermomechanical behaviour of a carbon fibre reinforced high-temperature thermoplastic composite

Abstract: Novel high-temperature thermoplastic polymers offer potential advantages over thermoset ones and represent a promising alternative in advanced composite applications. This work proposes to determine the thermal properties and resistance of unidirectional carbon fibre reinforced thermoplastic polyimide composite and to characterize the influence of temperature on its mechanical behaviour and properties, including tensile properties, interlaminar shear strength and failure mechanisms. Characterization is performed on composite tapes and on ring-shaped specimens manufactured using a heated-head thermoplastic filament winding process. Results show that the thermal degradation of such composite material occurs at temperature higher than 400 °C. The glass transition temperature is approximately 250 °C. The tensile strength is higher than 1200 MPa in the fibre direction on a temperature range varying from −50 to 250 °C. The material has also an outstanding fatigue strength under tension in this material direction. At 200 °C, the fatigue strength for a high number of cycles (2·10 6 ) is still approximately 50% of the static strength. One of the weak point of this composite laminate is the relatively low interlaminar shear strength at high temperature.