↑Ultrasonic plastic joining using torsional vibrations39ContentContent：Wehavebeenconductingtheresearchesonindustrialapplicationsof We have been conducting the researches on industrial high-powerultrasonicsandvisualizationtechniqueswiththeuseofapplications of high-power ultrasonics and visualization high-intensityultrasoundsources.techniques with the use of high-intensity ultrasound sources. follows:Morespecifically, More specifically, the subjects of our interest are as transformers,developmentfollows: development of high output-power piezoelectric realizationofadiffusesoundfieldinsidetheultrasoniccleaningvessel,transformers, realization of a diffuse sound field inside the foroptimizeddesignofbolt-clampedLangevin-typetransducersultrasonic cleaning vessel, optimized design of bolt-clamped excitationofhigh-amplitudetorsionalandvibrations,Langevin-type transducers for excitation of high-amplitude investigationofoptimumconditionsforultrasonicplasticjoiningusingtorsional and longitudinal vibrations, investigation of optimum torsionalvibrations,studyonstabilityofdegeneratingvibrationmodesconditions for ultrasonic plastic joining using torsional ofanelasticsystemagainsttemperaturechange,activemodalvibrationvibrations, study on stability of degenerating vibration modes controloflargeultrasonicvibrationtools,anddevelopmentoftheof an elastic system against temperature change, active modal vibration control of large ultrasonic vibration tools, ultrasonictime-of-flightcomputedtomographysystemforstructuraland development of the ultrasonic time-of-flight computed inspectionofbuildings.tomography system for structural inspection of buildings.Appealing point：Special objectivesWhat we are devoted to are not only experimental investigations for industrial applications of high-power ultrasonics, but also fundamental What we are devoted to are not only experimental and theoretical studies on various phenomena that we encountered in investigations for industrial applications of high-power ultrasonics, but also fundamental and theoretical studies on this field of technology. various phenomena that we encountered in this field of technology. ContentContent：Apolygonrepresentationhasbeensofarusedfordrawing3-dimensionalenormousmemory A polygon representation has been so far used for drawing requirementsandtremendousoperationcountsareindispensablefor3-dimensional objects. However, both enormous memory depictingasmoothobjectsurface.requirements and tremendous operation counts are Inthepresentstudy,discretepointsonanobjectaremeasuredbyindispensable for depicting a smooth object surface. usingalaserscanneroraCT(seeFig.1)and,subsequently,allthe In the present study, discrete points on an object are measured by using a laser scanner or a CT (see Fig. 1) and, pointsareinterpolatedtonumericallydetermineanimplicitsurfacesubsequently, all the points are interpolated to numerically f(x)=0(seeFig.2).Thismethodhasafollowingmerits:determine an implicit surface f(x) = 0 (see Fig. 2). This 1)Anobjectsurfacecanbedrawnsmoothly.method has a following merits:2)Amorphingcanberealizedbycalculatinganewimplicitfunction1）An object surface can be drawn smoothly.frommultipleimplicitfunctions.2）A morphing can be realized by calculating a new implicit 3)Reconstructionofmultipleobjectscanbeprocessedwithahighspeed.3）Reconstruction of multiple objects can be processed with Inthissense,thismethodcanbecomeapowerfultoolfortheCG In this sense, this method can become a powerful tool for technology.the CG technology.Appealing point：In the present study, a high-performance method Special objectivesfor determining a implicit surface is to be developed. In addition, the resulting method is also planned to be applied to both the structural In the present study, a high-performance method for analysis and the electromagnetic analysis.determining a implicit surface is to be developed. In addition, the resulting method is also planned to be applied to both the Yamagata UniversityGraduate School of Science and Engineering structural analysis and the electromagnetic analysis.Research Interest ：Numerical AnalysisYamagata University Graduate School of Science and Engineering E-mail ：kamitani@yz.yamagata-u.ac.jpResearch InterestTel ：+81-238-26-3331Numerical AnalysisFax：+81-238-26-3789E-mail ・ kamitani@yz.yamagata-u.ac.jpTel ・ +81-238-26-3331HP ：http://emperor.yz.yamagata-u.ac.jp/Fax ・ +81-238-26-3789HP・http://emperor.yz.yamagata-u.ac.jp/function from multiple implicit functions.a high speed.ApplicationsFig.1.Discretepointsona3Dobject,thecoordinatesofwhicharemeasuredbyusingalaserscanner.Fig.2.Theimplicitsurfacereconstructedonthebasisofthediscretepoints.Yamagata UniversityGraduate Schoolof Science and Engineering Yamagata University Graduate School of Science and Engineering Research Interest ：Research InterestHigh-power ultrasonicsE-mail：kadachi@yz.yamagata-u.ac.jpE-mail ・ kadachi@yz.yamagata-u.ac.jpTel ：+81-238-26-3267Tel ・ +81-238-26-3267HP ：http://yurns.yz.yamagata-u.ac.jp/HP・http://yurns.yz.yamagata-u.ac.jp/Joint↑A polarized microscopic image of the cross section of two polyethylene films joined by torsional ultrasonic vibrations.A bolt-clamped Langevin-type transducer used for excitation of high-amplitude ultrasonic vibration←Cross-sectional imaging (right) of a wooden log with a hole in it (left ) using ultrasonic time-of-flight computed tomography.thesubjectsofourinterestareasofhighoutput-powerHigh-power ultrasonicsobjects.However,piezoelectriclongitudinalbothHigh-Power Ultrasonics and Its Applications to IndustryNumerical Representation of 3D Object by Means of Implicit SurfaceProfessor Atsushi KamitaniProfessor Atsushi KamitaniProfessor Kazunari AdachiHigh-Power Ultrasonicsand Its Applications to IndustryNumerical Representation of 3D Object by Means of Implicit SurfaceProfessorKazunari Adachi
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