| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 104 === This study select design parameters of the new spanner using fishbone diagram and optimization theory for multi-objective optimization design in relation to increase of service life, cost down, handling safety and handling convenience. The first, four chosen design factors external diameter of handle、bend radius of handle、bevel angle of handle and inner diameter of handle are used to create the new spanner model via 3D drawing software. Finite element analysis software show the disposition of stress when the new spanner is bearing a bending moment. Design target for decrease stress concentration and mass lightweight are applied to Taguchi methods and Response surface methodology.
The results indicates the Taguchi methods only get local region batter values, but Response surface methodology can get global region optimization values. The final, we use multi-objective response surface methodology to find the optimization design. The results show the optimization global region equivalent tress was 154.0 MPa and minimum mass was 0.66 kg when external diameter of handle was 22.4 mm , bend radius of handle was 31.0 mm, bevel angle of handle was 40.0 deg and inner diameter of handle was 14.0 mm. The maximum stress increase by 3.66% and the minimum mass increase by 4.55% in comparison with Single-objective Response surface methodology. The optimization stress decrease by 2.92% and the minimum mass increase by 3.03% in comparison with Taguchi methods.
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