Calculating Centre of Mass and Centre of Gravity for a Humanoid Robot

In summary, Shruti is seeking help with calculating the centre of mass and centre of gravity for a biped humanoid robot she wants to make. The conversation also includes advice on finding the overall centre of mass by calculating the centre of mass of each individual part and using a formula, as well as a reference to a specific robot model for further guidance.
  • #1
iro2010009
1
0
hii..

this is shruti...
i want to make an inverted linear pendulum of bi ped humanoid robo...
can any 1 help me in calculating the centre of mass and centre of gravity... of a humanoid robot...
 
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  • #2
welcome to pf!

hi shruti! welcome to pf! :smile:

centre of mass and centre of gravity of a robot on Earth are the same thing

to find the centre of mass of the whole robot at time t, find the centre of mass of each part (leg etc) at time t, then use the usual formula to find the overall centre of mass :wink:
 
  • #3
hi shruti! :smile:

if you have a robot like Fujitsu's http://home.comcast.net/~jtechsc/HOAP-3_Spec_Sheet.pdf" ,

find the mass of each individual part (leg, head, etc), and find the position of the centre of mass of each part (the parts are reasonably regular, should that should be fairly easy)

then if the masses are m1 m2 etc, so that the total mass is M = m1 + m2 + …

and if the centre of mass of the nth part is at position (xn, yn, zn),

then the centre of mass is at ([x1 + x2 + …]/M, [y1 + y2 + …]/M, [z1 + z2 + …]/M) :smile:
 
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FAQ: Calculating Centre of Mass and Centre of Gravity for a Humanoid Robot

What is the difference between centre of mass and centre of gravity?

The centre of mass is the point where the entire mass of an object is considered to be concentrated, while the centre of gravity is the point where the entire weight of an object is considered to be concentrated. For most objects, the centre of mass and centre of gravity are in the same location. However, for objects with varying weight distributions, the centre of mass and centre of gravity may differ.

How do you calculate the centre of mass for a humanoid robot?

To calculate the centre of mass for a humanoid robot, you will need to know the mass and position of each individual body part. The centre of mass can be calculated by taking the sum of each body part's mass multiplied by its distance from a chosen reference point, and then dividing by the total mass of the robot. This will give you the coordinates for the centre of mass.

Why is it important to know the centre of mass for a humanoid robot?

Knowing the centre of mass for a humanoid robot is important for several reasons. Firstly, it helps with balance and stability. By understanding where the robot's weight is concentrated, you can design its structure and movement to maintain balance and prevent falls. Secondly, the centre of mass can also affect the robot's performance and efficiency, as it can impact the amount of energy required for movement.

What factors can affect the centre of mass for a humanoid robot?

The centre of mass for a humanoid robot can be affected by several factors, including the distribution of weight among its body parts, the position and orientation of the robot, and the environment in which it is operating. Additionally, any changes made to the robot's design or components can also alter its centre of mass.

Can the centre of mass for a humanoid robot change?

Yes, the centre of mass for a humanoid robot can change if any of the factors mentioned above are altered. Even small changes in weight distribution or positioning can affect the centre of mass. This is why it is important to recalculate the centre of mass whenever there are changes made to the robot's design or components.

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