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1、. .The Ko Society of Mechanical EngineeringThe study of wiper shape for the uniformed pressure on the glassYYYY HH Kim*, Je HHHH Oh*, KU CCC Shi*Department of Mechanical Engineering, HHHHHH University, KKKKK. *Department of Mechanical Engineering, AAAAA college of Technology, KKKKK. *IntroductionThe

2、 study of wiper shape for the uniformed pressure on the glassModeling & Analysis VariablesExperimental Details The wiper secure a drivers sight about 80% of windshield.ConclusionResultsv We focused on uniformed pressure which is very important thing for well polished condition. This study was ap

3、proached by changing shape. So, primary curvature was changed and three type of results was got by changing yoke angle, yoke thickness and rail spring thickness.v The conclusion is that in flat type wiper included yokes case, Yoke angle is sensitive shape parameter and Yoke thickness can reduce Yoke

4、 angles sensitivity.v This study was limited in case of flat type wiper included yokes; however this study will be approached another type wiper.PartYoungs modulus (GPa)Poissons RatioMooney-Rivlin parameters (C10,C01)PrimarySpringYokeRubber210210210-0.30.30.30.499-(3.1071E5, 5.2202E5) The uniformed

5、pressure is very important characteristic for well polished condition.Therefore, the study of wiper shape for the uniformed pressure is necessary for drivers safety Piezo-resistance Pressure sensor device (Tekscan co.)We measured the weight (g/mm) using Tekscan device for three samples. We use three

6、 kinds of primary curvatures for yoke angle, yoke thickness and rail spring thickness. Each result was obtained from Y-normal stress at end of rubber which is in contact with the glass. Tekscan measurement vs. ANSYS result (curvature 3; two kinds of yoke angles)Rubber blade Y-normal stress4702 eleme

7、nts5402 nodes All quad. element by mapped meshRubber blade model was simplified by T shape.In flat type wiper included yokes case, yokes end points have higher weight than other pointsCAD ModelConsideration of boundary conditionsFEA(structural, nonlinear)Variables discussionResult discussionExperime

8、ntAnalysis on real pressure phenomenonFEA with variables(structural, nonlinear)ProcessThe commercial flat type wiper included yokes (KCW co.)Material propertiesModeling We use commercial software ANSYS for FEA (Finite Element Analysis). Each element consists of SHELL element by CATIA V5 CAD tool.Yok

9、e thicknessRail spring thicknessRubberbladeGlassVariables From the first model analysis and experimental measurements, we needed to change yoke angle for dividing same weight each yoke end points. Additionally, we changed yoke thickness and rail spring thickness.v Even though we changed small angle

10、of about 1 that can be easily occurred in manufacturing line, the curve of wiper contact pressure changed a lot.v The contact pressure also can be changed by different yoke thickness.v Rail spring thickness variable is not important for uniformed pressure.Yoke angle was changed for dividing weight at each yokes end point, and then used for yoke and rail spring thicknessWhen thickness became thicker, one yokes end point weight :which was added weight above

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