Calculating Maximum Inertial and Connecting Rod Forces in a Piston Mechanism

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SUMMARY

The discussion focuses on calculating maximum inertial and connecting rod forces in a piston mechanism connected to a crankshaft. Key parameters include a crank length of 50mm, a connecting rod length of 250mm, and a piston mass of 150g. The equations discussed include angular momentum, inertia, and torque, specifically how to derive force from these variables. The user seeks guidance on how to initiate calculations based on these established principles.

PREREQUISITES
  • Understanding of angular momentum and inertia
  • Familiarity with torque and its relationship to force
  • Basic knowledge of mechanics of materials
  • Ability to apply equations of motion in mechanical systems
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  • Research the calculation of angular momentum in mechanical systems
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Mechanical engineers, students studying dynamics, and anyone involved in the design or analysis of piston mechanisms will benefit from this discussion.

jonnygeordie
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Ok so here's the question I am looking at.
A piston and cylinder mechanism is connected to a crank shaft. The crank is 50mm long, the connecting rod 250 mm long and the piston has a mass of 150g. If the engine speed is w rad/sec and the crankshaft torque T Nm calculate:-

i) Max inertial force between the piston and connecting rod
ii) Max. force in the connecting rod


My question is where to start.

I know
Angular momentum = Inertia x w

Force = Torque/ distance

Torque = angular momentum x Inertia


Now for the seond pat of the question, combining two of the above equations i get

Force = (angular momentum X inertia) / distance.


The problem is i have no idea where to start, if someone could give me a startpoint i would be greatfull. I am sure once i have that then the rest will fall into place
 
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You can find solution to this problem in theory mechanism and machines textbooks
 

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