To Find Center Of Gravity Of A Rickshaw

i was just designing the model in solid works and i dont have a prototype . i just have the wheel base and total load of the rickshaw . how to find the center of gravity

Wouldn't the designer know how to find the CG of the item they are designing?

Oh, never mind. YOU ARE the designer.

Build a prototype and test it.

Otherwise, you may have to resort to taking the advice of people who know less than you do about the design.

So, it would change depending on how many people were sitting in it, their size(s) and shape(s), then?

Simple. Pilots have to do this all the time.

1. Weight & Balance apps - Aircraft Owners and Pilots Association
2. iFly Weight and Balance for iPad on the iTunes App Store

Use a spring scale to lift the handle. Call that weight R_handle. Measure the horizontal distance from the center of the wheels to the handle. Call that L. multiply L by R_handle and divide by the total weight to find the horizontal distance from the center of the wheels to the center of gravity_.

The vertical distance is more difficult.

i was just designing the model in solid works and i dont have a prototype . i just have the wheel base and total load of the rickshaw . how to find the center of gravity

harsha_itt

You're going to have to assign materials to each part. If the materials you're using aren't in the Solid Works data base you will have to create them.

Then do the mass properties. That will give you a Center of Gravity with respect to the assembly origin.

You can always create a new origin and do the calculation around that origin.

Use Solid Works.

There! Problem solved!

Just use the mass properties command. SW will do all the work for you.

I use Auto-Cad since 20 years , I have no plan to switch to SW.

If you wanta do it in AutoCAD, just convert the views into REGION and use MASSPROP on the region.

http://en.wikipedia.org/wiki/Locating_the_center_of_mass

CAD <groan>... slaps virtual head with paw.
Design the damn thing so you can adjust it's c of g!
Grrrr ftz hissss.
Virtual problems.... cheezes... I have enough real ones

Del (grumpy mode engaged)

how to find centre of gravity in solidworks

Assuming that it is a hand pulled one.
The center of gravity can be shifted by lifting or lowering the boom or by the runner moving forward or backwards. The ideal position would be close to directly above the axes of the wheels.

Nice way to save money and energy.

In many drafting programs, you can assign a material (and its density) to each piece in your rickshaw. Then, the program can calculate the CG for you. You can do this yourself, of course, assuming the rickshaw is symmetrical from side to side:

Pick a point along the length of the rickshaw. Measure from that point to the estimated CG of each component in the rickshaw. Call that dimension D. For each component, multiply D by the component's mass. This will produce a fake moment for each mass. (For a real moment you'd need a force rather than a mass.) Sum all these moments. Divide this sum by the total mass. The answer will be the longitudinal location of the CG.

If so inclined, repeat in the vertical direction.