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The safety factor: case studies in engineering judgment

机译:安全因素:工程判断中的案例研究

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摘要

While the concept of the safety factor in mechanical analysis and design is introduced early and reinforced throughout the typical mechanical engineering curriculum, it is often misunderstood and misinterpreted by engineering students. This is especially evident in 'capstone design' experiences, when the safety factor ceases to be a 'given' and becomes yet another design variable that must be selected and justified by the student design team. This paper reviews the concept of the safety factor from a variety of viewpoints, each of which can provide some insight to the student of mechanical design, and addresses some of the classical misconceptions and misuses of the safety factor by undergraduate students. It also proposes teaching tools that can be used to highlight the concept of the safety factor as a design variable, whose specification requires analysis, insight, and engineering judgment.
机译:尽管机械分析和设计中的安全系数的概念很早就引入并在整个典型的机械工程课程中得到了强化,但工程专业的学生经常对其进行误解和误解。这在“顶盖设计”经历中尤为明显,因为安全因素不再是“给定的”,而成为又一个设计变量,必须由学生设计团队选择和证明。本文从多种角度回顾了安全系数的概念,每种观点都可以为机械设计专业的学生提供一些见识,并解决了一些典型的对本科生对安全系数的误解和误用。它还提出了教学工具,可用于强调安全系数作为设计变量的概念,其规格需要分析,洞察力和工程判断力。

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