60Yamagata university Graduate School of Science and EngineeringResearch InterestFluid EngineeringE-mail ・ rinosika@yz.yamagata-u.ac.jpTel ・ +81-238-26-3225Fax ・ +81-238-26-3225HP・http://vweb.yz.yamagata-u.ac.jp/fluids/Content The door mirrors that are added to the vehicle body exhibit exhibit aerodynamically generated drag, noise and vibration. The extensive effective analysis and control of flow around the door mirrors have been becoming a greater concern and an important theme. In order to study the turbulent structures of various scales around a door mirror, the high-speed PIV technique was first used to measure the velocity fields. Figure (a) shows the distribution of time-averaged streamlines and Reynolds stresses. The large-scale vortical structure shed from the root and side portion of mirror forms the separation region, the intermediate- and relatively small-scale structures are respectively generated from the tip of the mirror and the edge of the mirror. Then the instantaneous turbulent structures were decomposed into the large-, intermediate- and relatively small-scale structures by the wavelet multi-resolution technique. Figures (b)-(c) indicate that the large-scale turbulent structure makes the largest contribution to the Reynolds stress in the range of separation shear layer. The relatively small-scale structure, however, makes a more contribution to the Reynolds stress in the shear layer near the mirror.Content:ContentGeometryofinvolutegearsisresearchedinourlaboratory.We Geometry of involute gears is researched in our obtainedthetheoreticalgeartoothprofileexactly.Thetheoreticallaboratory. We obtained the theoretical gear tooth profile profileisusedtoexaminethatthegearisaccuratelyproducedornot.exactly. The theoretical profile is used to examine that the Objectsofourresearcharethevariablegearratiorackandthegear is accurately produced or not.pinionforsteeringsystemsofautomobiles(Fig.1),andtheconical Objects of our research are the variable gear ratio rack involutegearthatismostgeneraltypeoftheinvolutegear(Fig.2).and the pinion for steering systems of automobiles (Fig. 1), and the conical involute gear that is most general type of the Wealsoexecutetheperformancetestofthevariablegearratioinvolute gear (Fig. 2). rackantthepinion,andthefatiguetestoftheconicalinvolutegear We also execute the performance test of the variable gear forpracticaldesign(Fig.3).ratio rack ant the pinion, and the fatigue test of the conical systemforgeardesignisinvolute gear for practical design (Fig. 3).laboratory(Fig.4).Thissystemisapplieddevelopedinour Moreover, the intelligent support system for gear design is knowledgeengineeringtechnology.Weaimtorealizethesystemthatdeveloped in our laboratory (Fig. 4). This system is applied anyoneobtainsgoodgeardesignsolutionusingourdevelopedknowledge engineering technology. We aim to realize the system.system that anyone obtains good gear design solution using our developed system.Yamagata University Graduate School of Science and Engineering Research Interest MachineElements,DesignEngineering, KnowledgeEngineeringYamagata University Graduate School of Science and Engineering E-mail：ohmachi@yz.yamagata-u.ac.jpResearch InterestMachine Elements, Design Engineering, Knowledge EngineeringTel ：+81238263254Fax ：+81238263205E-mail ・ ohmachi@yz.yamagata-u.ac.jpTel ・ +81-238-26-3254Fax ・ +81-238-26-3205Moreover,Fig.1VariableGear RatioR&PFig.2ToothBearingTestofConical InvoluteGearsFig.4GearDesignSystemFig.3FatigueTestofConicalInvolute GeartheintelligentsupportAssociateProfessorTatsuyaOhmachiVisualization on Multi-Scale Structures of a Vehicle Door Mirror WakeProfessor Akira RinoshikaDesign and Development of Involute Gears and Gearing SystemsDesignandDevelopmentofInvoluteGearsandGearingSystemsAssociate Professor Tatsuya Ohmachi
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