Module 3 - Design of Mechanical Elements
Chapter 12: Journal Bearings
Chapter 12 Overview
Chapter 12 covers the following key concepts:
- Types of lubrication
- Petroff's equation
- Design variables
Lecture 21A
In case you missed it, here's a video of the first part of Lecture 21 In this video, we break down the different type of lubrication used in mechanical systems.
Lecture 21B
In case you missed it, here's a video of the second part of Lecture 21. In this video, we review the concept of viscosity - focusing on dynamic viscosity in Newtonian fluids and how it relates to shear stress.
Lecture 21C
In case you missed it, here's a video of the third part of Lecture 19. In this video, we walk through Petroff's equation and its role in analyzing lightly loaded journal bearings.
Lecture 21 Tasks
In this lecture, we will explore properties of lubricants and journal bearings, including Petroff's lightly loaded journal bearing model.
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Read
- Sections 12.1-12.12 of Shigley's Mechanical Engineering Design.
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Watch
- 35-ton Load Floats on Air: See this air bearing move an extremely heavy object. This is a prime example of hydrostatic lubrication.
- AMP Skid Pad: Driving on a wet surface is a good example of hydrodynamic lubrication. A skid pad, like the one at Atlanta Motorsports Park, is an opportunity to drive on a slick surface in a controlled environment.
- Engine Oil Codes Explained, SAE (Society of Automotive Engineers) numbers (by Craig Kirkman): What do engine oil grades mean? And what does the W mean in 5W-30? (Hint: It doesn't have anything to do with weight.)
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Practice
- Try taking Practice In-Class Quiz 7, to prepare for Thursday's In-Class Quiz.
- After you're done, see how you did by comparing your answers to the Practice In-Class Quiz 7 Solution.
- Problems 12-1 and 12-3 from Shigley's Mechanical Engineering Design, and then review the solutions posted.
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Complete
- Lecture 21 Quiz, due Thursday, April 10 at 11:59 PM.