Slider crank mechanism. Help needed to find the velocity & angular velocity.

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Discussion Overview

The discussion focuses on a homework problem involving a slider crank mechanism, specifically determining the velocity of the piston and the angular velocity of the connecting rod based on given parameters such as crank length, connecting rod length, angle, and rotation speed.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • The problem involves a crank of 10 cm and a connecting rod of 50 cm, with the crank at a 60-degree angle and rotating at 110 revolutions per minute.
  • One participant requests a diagram to better understand the configuration of the mechanism.
  • Another participant suggests defining angles for the crank and connecting rod and proposes finding the relationship between these angles to derive the necessary velocities using the chain rule.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as the discussion is still in the early stages with varying contributions and no definitive solutions presented yet.

Contextual Notes

The discussion lacks a complete set of assumptions or definitions regarding the relationships between the angles and the velocities, which may affect the analysis.

Who May Find This Useful

Students studying mechanical engineering or physics, particularly those interested in kinematics and mechanisms.

bobmarly12345
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Homework Statement



The instantaneous configuration of a slider crank mechanism has a crank GH 10cm long, the connecting rod HP is 50cm. The crank makes an angle of 60 degree with the inner dead centre position and is rotating at 110 rev/min. Determine the velocity of the piston P and the angular velocity of the link HP.

urgent help is needed! i have an exam soon & i have no example of this type of question to work from. please help!
 
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hi bobmarly12345 :smile:

can you provide a diagram? :confused:
 
here is the photo of the diagram
 

Attachments

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    Untitled.png
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ah!

ok, call the G angle θ, and the P angle ψ (so dθ/dt = ω),

find the equation relating θ and ψ,

then use the chain rule to find dψ/dt :smile:
 

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