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所在平台: Coursera |
课程主页: https://www.coursera.org/learn/machine-design1
课程评论：没有评论
课程名称：机械设计第一部分 课程概述：“机械设计第一部分”是“机械设计”系列课程的第一门课程，共分为三部分，深入探讨机械设计的基础知识。该系列课程涵盖多个基本的机械设计主题，包括静态和疲劳失效理论、轴、紧固件和齿轮的分析，以及机械系统（如变速箱）的设计。在这个课程中，我们将研究许多有趣的设计案例，包括全髋关节植入物的材料选择、777飞机机翼的设计与测试，以及动态载荷对螺栓压力容器设计的影响。 在第一门课程中，您将学习预测和验证设计性能与寿命的可靠分析技术。课程开始时，将回顾设计中关键的材料特性，如应力、强度和热膨胀系数。接下来，我们将转向静态失效理论，如冯·米塞斯理论，以避免静态载荷应用中出现的失效（例如桥梁中的梁）。最后，您将学习适用于动态载荷设计的疲劳失效标准，如汽车传动系统中的输入轴。 课程大纲： 1. **设计中的材料特性**：本周提供课程内容概述、目标受众、讲师背景和学习成功的技巧，重点介绍设计中的关键材料特性。通过案例研究分析Zimmer正骨髋关节植入物的材料选择，实践这些材料特性的应用。课程结束时通过测验1检查对材料特性的理解。 2. **静态失效理论 - 第一部分**：本周回顾应力、强度和安全系数，主要讨论轴向、扭转、弯曲和横向剪切应力。强调学生需具备之前固体力学或材料力学的基础，完成相关练习以复习分析技能。 3. **静态失效理论 - 第二部分**：涵盖韧性转脆性温度和应力集中因素，学习两种关键的静态失效理论，展现波音777的极限载荷测试案例，强调分析和验证的重要性。完成相关练习并参与测验2。 4. **疲劳失效 - 第一部分**：介绍疲劳的关键原则，如完全反向应力和SN曲线，讨论如何估计完全调整的耐久极限。通过分析Aloha Airlines 293航班疲劳失效的根本原因案例，强调疲劳失效的危险性。完成练习并参加测验3。 5. **疲劳失效 - 第二部分**：学习波动和随机变化应力的疲劳失效标准，包括修改的Goodman线和米勒法则。完成相关练习并参与测验4，最后参加全综合测验，以评估对课程内容的总体理解。 通过这门课程，您将获得机械设计的基础知识，掌握关键的分析技术，以支持未来的工程设计工作。
Name:Material Properties in Design
Description:In this week, we will first provide an overview on the course's content, targeted audiences, the instructor's professional background, and tips to succeed in this course. Then we will cover critical material properties in design, such as strength, modulus of elasticity, and the coefficient of thermal expansion. A case study examining material selection in a Zimmer orthopedic hip implant will demonstrate the real life design applications of these material properties. At the end of the week you will have the opportunity to check your own knowledge of these fundamental material properties by taking Quiz 1 "Material Properties in Design."
Name:Static Failure Theories - Part I
Description:In week 2, we will review stress, strength, and the factory of safety. Specifically, we will review axial, torsional, bending, and transverse shear stresses. Please note that these modules are intended for review- students should already be familiar with these topics from their previous solid mechanics, mechanics of materials, or deformable bodies course. For each topic this week, be sure to refresh your analysis skills by working through worksheets 2, 3, 4 and 5. There is no quiz for this week.
Name:Static Failure Theories - Part II
Description:In this week we will first cover the ductile to brittle transition temperature and stress concentration factors. Then, we will learn two critical static failure theories; the Distortion Energy Theory and Brittle Coulomb-Mohr Theory. A case study featuring the ultimate load testing of the Boeing 777 will highlight the importance of analysis and validation. Be sure to work through worksheets 6, 7, 8 and 9 to self-check your understanding of the course materials. At the end of this week, you will take Quiz 2 “Static Failure.”
Name:Fatigue Failure - Part I
Description:In week 4, we will introduce critical fatigue principles, starting with fully revisable stresses and the SN Curve. Then, we discuss how to estimate a fully adjusted endurance limit. Finally, a case study covering the root cause analysis of the fatigue failure of the Aloha Airlines flight 293 will emphasize the dangers of fatigue failure. In this week, you should complete worksheets 10, 11 and 12 as well as Quiz 3 “Fully Reversed Loading in Fatigue.”
Name:Fatigue Failure - Part II
Description:In this last week of the course, we will cover the fatigue failure criteria for fluctuating and randomly varying stresses, including key concepts such as the Modified Goodman line and Miner’s Rule. This week be sure to complete worksheets 13 and 14 as well as Quiz 4 “Fluctuating Fatigue and Miner’s Rule.” Finally, take Quiz 5, “The Comprehensive Quiz”, which will measure your overall knowledge of this course.
“Machine Design Part I” is the first course in an in-depth three course series of “Machine Design.” The “Machine Design” Coursera series covers fundamental mechanical design topics, such as static and fatigue failure theories, the analysis of shafts, fasteners, and gears, and the design of mechanical systems such as gearboxes. Throughout this series of courses we will examine a number of exciting design case studies, including the material selection of a total hip implant, the design and testing of the wing on the 777 aircraft, and the impact of dynamic loads on the design of an bolted pressure vessel. In this first course, you will learn robust analysis techniques to predict and validate design performance and life. We will start by reviewing critical material properties in design, such as stress, strength, and the coefficient of thermal expansion. We then transition into static failure theories such as von Mises theory, which can be utilized to prevent failure in static loading applications such as the beams in bridges. Finally, we will learn fatigue failure criteria for designs with dynamic loads, such as the input shaft in the transmission of a car.
