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Engineering Expert Witness Blog

Published by Philip J. O'Keefe, PE, MLE

Last Build Date: Mon, 13 Nov 2017 14:11:53 +0000


Flywheel Torque and Distribution of Mass

Mon, 13 Nov 2017 14:08:22 +0000

Most flywheels are designed with heavy rims supported by small hubs and slender spokes, because the more mass that’s distributed away from the flywheel’s center of rotation, the greater the flywheel’s moment of inertia and torque, and the more kinetic energy it can store.

Moment of Inertia in a Flywheel

Mon, 06 Nov 2017 19:39:34 +0000

Our illustration shows we have five parts to consider: a hub, three spokes and a rim, and label them A, B, C, D, and E respectively. Each part has its own mass, m, and is a unique distance, r, from the flywheel’s center of rotation.

How Much Kinetic Energy is Contained Within a Spinning Flywheel?

Thu, 26 Oct 2017 21:10:20 +0000

Each of those parts has its own mass, m, and is a unique distance, r, from the flywheel’s center of rotation, and all these parts must be accounted for in order to arrive at a calculation for the total amount of kinetic energy contained within a spinning flywheel.

Two Types of Velocity Associated With a Spinning Flywheel

Thu, 19 Oct 2017 17:57:22 +0000

Flywheels rotate about a fixed point rather than move in a straight line, but determining the amount of kinetic energy stored within a spinning flywheel involves an examination of both its angular velocity and linear velocity.

Radians and the Angular Velocity of a Flywheel

Tue, 10 Oct 2017 20:07:01 +0000

Applying these facts to radians, we find that during one complete revolution of a flywheel the measure of the angle θ increases from 0 radians to 2π radians.

Angular Velocity of a Flywheel

Wed, 04 Oct 2017 19:36:24 +0000

We introduced the flywheel in our last blog and the fact that as long as it’s spinning it acts as a kinetic energy storage device. Today we’ll work our way towards an understanding of how this happens when we discuss angular velocity.

What Came First? The Wheel or the Flywheel?

Mon, 25 Sep 2017 18:27:34 +0000

What came first? The wheel or the flywheel? Archeologists have been debating this question for decades. One thing is certain, they both date back to prehistoric times.

Optimizing Belt Width in a Pulley-Belt Assembly

Fri, 15 Sep 2017 15:15:53 +0000

We can use a belt of minimum width of 3.22 inches to safely transmit 4 horsepower from the engine to the pump without incurring breakage and slippage along the belt, thereby optimizing power transmission within our assembly.

Unit Conversion, Horsepower to Foot-Pounds per Second

Mon, 04 Sep 2017 20:55:10 +0000

To smooth things out we’ll have to do some converting of units. We’ll start by dividing V by 60 seconds per minute so it can be expressed in units of feet per second,

Tangential Velocity Dangers

Mon, 28 Aug 2017 14:15:45 +0000

We've been discussing tangential velocity within the context of a pulley and belt assembly in recent blogs, and you may have wondered whether you encounter this phenomenon in your everyday life.