Jump to content

Recommended Posts

Posted

Hi,

This is my first time posting, I hope you can help.

 

Designing a belt system. Two pulleys, two tensioners. 5 m circumference of belt.

Found moment of inertia of pulleys and tensioners

Found moment of inertia of belt

added the two: 0.742750068

 

then used K.E= 1/2 * I * omega^2

to get rotational energy at full speed (1200 rad/s)

K.E = 53478004.91 joules

SEEMS EXCESSIVE!!

want to find motor power required to run this. so i chose an acceptable start up time 60 seconds for the 187 kg belt to reach 30 m/s however this told me

I'd require a 891KW motor

 

Can anyone help me figure out where im going wrong??

 

p.s. mass moment of inertia for belt was calculated as belt total mass at driver radius.

Posted

Oh my god.. thanks for pointing that out! Its actually 200. i didnt notice it was so large because i have my calculations in a very messy excel sheet...thats rad/minute... not an SI unit by any stretch of the imagination. This should change a lot. Thanks!! I'll see what happens and post back here

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.