Question about the theory of machines

Thread starter dorteam
Start date Jun 22, 2020
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Engineering Machines Physics Theory

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The discussion centers on the theory of machines, specifically addressing the angle turned by a crank in relation to the dead center position. Participants clarify that the correct angle should be 240 degrees, not 2400, when referencing the inner dead center. The conversation emphasizes the importance of precise terminology in engineering contexts, particularly when discussing crank angles and dead centers.

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Jun 22, 2020

dorteam

New poster has been reminded to show the Relevant Equations and their work on the solution

Homework Statement: The stroke of an internal combustion engine is 180 mm. The connecting rod is 3 times the crank length and has a mass of 40 kg. The mass of the reciprocating part is 12 kg. The centre of mass of connecting rod is 110 mm from the crank pin centre and the radius of gyration about an axis through the centre of mass is 148 mm. the engine runs at 320 rpm. Find the magnitude and the direction of the inertia force and the corresponding torque on the crank shaft when the angle turned by the crank is 2400 from the inner dead centre.

Relevant Equations: They're in the given question.

I couldn't do it

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Jun 22, 2020

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dorteam said:

... when the angle turned by the crank is 2400 from the inner dead centre.

Welcome!

I believe that data is not correct.
Perhaps 240 degrees?
Either top or bottom dead center.

Please, see:
https://en.wikipedia.org/wiki/Dead_centre_(engineering)