| Summary: | 碩士 === 國立臺北科技大學 === 機電整合研究所 === 101 === Helical springs are an important element in the machinery and widely used. In this study, with CAE software package, one is to study the stiffness and the stress distribution on wire surface of the spring by changing the profile of its cross section, and study the effects of variable pitch and non-cylindrical springs. It is found that when the centroid and area of cross-section is fixed, the Oval-1-H95 is the optimal shape, it reduces the maximal stress by 2%~4% from the reference spring, when the stiffness is identical. On the other hand, when one comes to fix the outer diameter and the volume of springs, the Oval-2 is the optimal shape, it reduces the maximal stress and also strengthens the stiffness. The Oval-2-H85 is the best in reducing the maximal stress, it is 6% lower than that of the reference spring. And the Oval-2-H80 is the best in strengthening the stiffness, it is 15% higher than that of the reference spring, under the premise of lower stress than the reference spring.
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