- Home
- Engineering and Construction
- method of calculating mass moment of inertia of a crankshaft

# Method of calculating mass moment of inertia of a crankshaft Essay Example

- Category:Engineering and Construction
- Document type:Assignment
- Level:Undergraduate
- Page:1
- Words:202

Describe a method for calculating the mass moment of inertia of a physical crankshaft such as the one shown in the image above. Please describe your fully experimental method.

Solution

To determine the mass moment of inertia of a crankshaft, it is required to calculate the I for each of the sections in crank shaft. Assuming that the sections have equal characteristics i.e. equal lengths and widths, the mass moment of inertia of a single section can be determined then related to the rest of the sections. Each of the sections in the crankshafts is made up of a thin with its rotating about the axis. The following steps describe the process of determining the mass moment of inertia of a single Rod.

Let each section have a mass, m and length L. Let dx

The wings of the crankshaft are treated as a disk being rotated at the edge. Taking the radius of the disk as R, and a Mass of m, the derived equation for the moment of inertia is

Therefore, the mass moment of inertia of a section is

Let the number of sections of the crankshaft be n, the mass moment of inertia of the crankshaft is