Design Strategy for Modification of Torque Converters Based on Variation Law of Blade Angle

Abstract:

A design strategy is presented for modification of torque converters based on variation law of blade angle along design path.First,the initial graphics exchange specification (IGES) format is utilized as an interface to exchange cascade system data with computer aid design (CAD) software.Then,blade angle is calculated by using the blossoming of De Boor algorithm.The design paths which indicate variation law of blade angle are fitted to strings of nonuniform rational Bspline (NURBS).After that,it is possible to modify the design paths of blade angle by relocalizing control points or modifying weight values of them.Once the modified design paths of blade angle are obtained,blade shape is redefined.Afterwards,the modified torque converter model is transmitted to computational fluid dynamics (CFD) package for hydraulic performance prediction.The modification iterations might be carried on for several times before a desired performance is achieved.Finally,the modified torque converter model can be transmitted to CAD software for further detailed design.A modification design which’s to improve torque converting performance and economic performance respectively for one certain torque converter product is carried out based on the presented design strategy.The result shows that the proposed framework provides reasonable results and proves to be time efficiency.