Jump to content
Mechanical Engineering

Mass Inertia calculation of planetary gearbox

Recommended Posts

As a starting point, you must know the MMOI for each individual component; without that, you cannot begin.

Assuming that the individual component MMOI values are known, do a kinematic analysis of the planetary train to determine the velocity of the CM of each component. The use that information to formulate the kinetic energy of the entire system, all moving according to the kinematic relations. You will have to choose some rotation as a reference value, usually either the input or output rotation. The kinetic energy will have the form

T = (1/2) theta-dot^2 (term1+term2+...+termlast)

where theta is the reference rotation. The sum of terms indicated is the effective MMOI for the gear train.


Share this post

Link to post
Share on other sites

Thanks for the reply Sir. This gearbox has motor input with speed 6000 RPM. Ring/internal gear tube of gearbox is stationery. What is CM, dot & term? Moreover, should I also calculate radius of gyration for each component. For example, planet gears rotating on their axis or should I consider them with arm rotating on arm axis? Plz help.

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...