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Couplings and Flywheels MAE 322

Couplings and Flywheels - Mercer Universityfaculty.mercer.edu/jenkins_he/documents/Couplingsand... · 2017-02-20 · Couplings and Flywheels MAE 322 . Couplings are divided into categories

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  • Couplings and Flywheels

    MAE 322

  • Couplings are divided into categories

    • Rigid & Flexible

    • Rigid couplings by virtue of their simple rugged design are generally able to transmit more power than flexible couplings of comparable size but this is not an Important advantage except in high horsepower applications.

  • Shaft Misalignment Compensation

    • Angular and Lateral Misalignment are common and always present to some degree.

  • Flexible Couplings

    Universal joint bellows & plain couplings

  • Shaft Couplings

    Shigley’s Mechanical Engineering Design

    Fig. 16–26

  • Flexible Couplings

    Bellows coupling

  • Flywheels

    • Energy Storage

    – Punch Press

    – Baseball pitching machine

    • Smooth out fluctuating torque

    – Pistons on crank shaft

  • Flywheels: Torque required to accelerate

    Shigley’s Mechanical Engineering Design

    Sum of the moment (torque) along the axis= Inertia x angular acceleration.

  • Hypothetical Flywheel Case: Work & Energy

    Shigley’s Mechanical Engineering Design

    Fig. 16–27

  • Kinetic Energy

    Shigley’s Mechanical Engineering Design

  • Engine Torque for One Cylinder Cycle

    Shigley’s Mechanical Engineering Design Fig. 16–28

  • Punch-Press Torque Demand

    Shigley’s Mechanical Engineering Design

    Fig. 16–29

  • Coefficient of Speed Fluctuation, Cs

    Shigley’s Mechanical Engineering Design

  • Energy Change

    Shigley’s Mechanical Engineering Design

    Cs=Coefficient of Speed Fluctuation

  • More Basic Flywheel Equations

    𝐼 = 12𝑀𝑟2 Mass Moment of Inertia for a solid disk

    about central axis

    Energy change in/out ∆𝐸 = 12𝐼 𝜔2𝑚𝑎𝑥 − 𝜔

    2𝑚𝑖𝑛

  • Punch-Press Analysis

    Shigley’s Mechanical Engineering Design