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This paper presents a study to quantify the difference in roll feel experienced by the driver with a change in damper characteristics between "comfort" and "sport" mode. The vehicle and driver's motion are measured during the double lane change maneuver. In "sport" mode, the timing of steering operation was found to be faster (P = 0.0456), which can be explained by the driver being able to make quick upper body corrections to resist the slow vehicle roll motion. This difference in steering operation because of the man-machine feedback system can be considered as an objective measure to quantify roll feel.

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This study deals with polishing using abrasive water jet for corner parts of a mold. In recent years, great varieties of small volume production progresses and the demand for metal molds and dies is increasing. However, automation of polishing process is under developing, and expert workers manually perform polishing work which takes much time and requires skills. This study aims at rationalizing such difficult polishing work by application of abrasive water jet which uses free abrasive grains. In previous research, the surface roughness of 0.058μm(Ra) was achieved on polishing for plane surface of mold material. Since the nozzle was paralleled to finished surface and had collision with workpiece, it was difficult to apply abrasive water jet to polishing mold . In this report, round groove shaped workpieces, which are seen at corner parts of a mold, are dealt as one of difficult parts for manually polishing. The experiment on incident angle from workpiece is performed to cope with collision avoidance between mold and nozzle. From the experimental result, we discuss relation between incident angle and abrasive energy giving affect to erosion on polishing surface using abrasive water jet.

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