Understanding how to set up integrals for inertia

  • Context: Undergrad 
  • Thread starter Thread starter jtandron
  • Start date Start date
  • Tags Tags
    Inertia Integrals Set
Click For Summary
SUMMARY

This discussion focuses on setting up integrals for calculating the inertia tensor of a disk. The key steps involve constructing the inertia element and integrating over the volume of the object. The limits of integration vary based on the chosen coordinate system and the dimensions of the disk, particularly for the circular area in the xy-plane and the height along the z-axis. A reference link to a detailed guide on inertia tensors is provided for further clarification.

PREREQUISITES
  • Understanding of inertia tensors and their significance in physics.
  • Familiarity with volume integrals in calculus.
  • Knowledge of coordinate systems, particularly cylindrical coordinates.
  • Basic concepts of mechanics related to rigid body motion.
NEXT STEPS
  • Study the derivation of inertia tensors for different geometric shapes.
  • Learn about cylindrical coordinates and their application in volume integrals.
  • Explore the mathematical techniques for setting limits in multiple integrals.
  • Review the provided resource on inertia tensors for deeper insights.
USEFUL FOR

Students and professionals in physics, mechanical engineering, and applied mathematics who are working on problems related to rigid body dynamics and inertia calculations.

jtandron
Messages
1
Reaction score
0
Hello, and thank you in advanced for this. I am having trouble with setting up most if not all of my integrals when I am trying to find the elements of an inertia tensor. What would I do if i need to find say the tensor for a disk, but i don't know what to take for my three limits to be. i get that for the xy-plane it should be the circular area, but then for the z-axis? my head can't wrap itself around it. Again, please if you could shed me some help i thank you very much for it.
 
Physics news on Phys.org
Welcome to PF;
See: http://www.maths.tcd.ie/~kovacs/Teaching/Mechanics/tensor_inertia.pdf

Basically you construct the inertia element, then you add up all the lements - this will normally involve integrating over the volume of the object in question. The exact limits depend on the coordinate system and the extent of the object ... just like any volume integral.
 
Last edited by a moderator:

Similar threads

  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
2
Views
2K
Replies
3
Views
1K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 138 ·
5
Replies
138
Views
9K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K