Mobility and degrees of freedom

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SUMMARY

Mobility and degrees of freedom (DOF) are distinct concepts in mechanical systems, as clarified in the discussion. Mobility is defined by the equation Mobility = 3n - 2p1 - p2, while degrees of freedom is calculated using DOF = 3(N - 1) - 2P - H. Here, N represents the number of links, P denotes the number of lower pairs, and H indicates the number of higher pairs. The confusion arises from varying definitions found online, but the lecturer's notes provide a clear differentiation between the two terms.

PREREQUISITES
  • Understanding of mechanical linkages
  • Familiarity with kinematic pairs, specifically lower and higher pairs
  • Basic knowledge of equations related to mobility and degrees of freedom
  • Concept of links in mechanical systems
NEXT STEPS
  • Research the implications of the equation Mobility = 3n - 2p1 - p2 in mechanical design
  • Study the different types of kinematic pairs, focusing on lower pairs and higher pairs
  • Explore examples of mechanical systems to calculate their degrees of freedom
  • Learn about the applications of mobility and degrees of freedom in robotics and mechanism design
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Mechanical engineers, students studying kinematics, and professionals involved in robotics and mechanical design will benefit from this discussion.

morry
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Hi guys,

Just a quick question. In my lecturers notes, he has mobility and degrees of freedom as different things. With a separate equation for each.

However, when I went searching the net for some info because I couldn't understand the notes, I found it to be different.

The sites I found on the web, which look legit, say they are the same thing.

My lecturers notes say that Mobility = 3n-2p1-p2. And degree of freedom = MO -L.

I have no idea what that L means.

Can anyone explain this to me?
Thanks.
 
Engineering news on Phys.org
define mobility
 
Degrees of freedom

Degrees of freedom is given by
DOF=3(N-1)-2P-H

N= number of links
p=numberof lowerpair
h=number of higher pair

lower pairs are sliding pair,cylindrical pair,spherical pair
higher pairs have only point contact.
eg;cam and follower
 

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