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A CONSISTENT APPROACH TO PROBLEM SOLVING IN MECHANICAL VIBRATIONS

机译:在机械振动中解决问题的一致方法

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A consistent approach to solving problems in an undergraduate vibrations course in Mechanical Engineering is presented in this paper. The traditional approach of solving vibration problems involves several steps such as classifying the system according to degrees of freedom, free or forced vibrations and with or without damping. Based on the classification, an appropriate solution technique is applied and the results are obtained. Since the mathematical solution technique is strictly tied to the classification, students have to learn and apply a variety of solution methods based on the particular form of the mathematical model. The course was literally more like a math course rather than an engineering course. By introducing students to the state-space solution method early in the course and using it as the main/dominant solution method, students can focus more on learning both the physical modeling and mathematical modeling of the vibration systems as well as interpreting results in the engineering context. Since state-space computational solvers are readily available to students (MATLAB, Mathcad, etc.) and they can be applied to solve most (but not all) vibration problems including free or forced SDOF, 2DOF, MDOF systems with or without damping, it allows for consistency when teaching students how to solve vibration problems. State-space solvers can solve for either the time or the frequency response and provides a graphical solution. The students can go from modeling to visually exploring and interpreting results. The students' response to this approach is also discussed.
机译:本文提出了一种解决机械工程本科振动过程中问题的一致方法。求解振动问题的传统方法涉及几步,例如根据自由度,自由或强制振动以及有或没有阻尼的分类系统。基于分类,施加适当的解决方案技术,得到结果。由于数学解决方法严格绑定到分类,因此学生必须基于数学模型的特定形式来学习和应用各种解决方案方法。该课程更像是数学课程而不是工程课程。通过将学生介绍到课程早期的国家空间解决方法,并使用它作为主要/主导解决方法方法,学生可以更多地专注于学习振动系统的物理建模和数学建模以及工程中的解释结果语境。由于国家空间计算求解器随时可供学生(Matlab,Mathcad等),它们可以应用于最多(但不是全部)振动问题,包括自由或强制SDOF,2DOF,MDOF系统,其中没有阻尼,它在教生如何解决振动问题时允许一致性。状态空间求解器可以解决时间或频率响应并提供图形解决方案。学生可以从建模到视觉探索和解释结果。还讨论了学生对这种方法的回应。

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