1. Working Model Problem 15-62
Prof. Granda
ME-115
Pritpal Singh

2. Problem
In engine system shown, L=8 inches (connecting rod), and b = 3 inch ( length of crank).
Crank Rotates at 1000 RPM Clockwise.
Velocity of Piston?
Angular Acceleration of Connecting Rod?

3. Approach Using Working Model 2D Solve for : Velocity of Piston
Angular Velocity of Connecting Rod

4. Making the 2D model in Working Model
Made the crank rod ( using rectangle )
Connected that to back ground using a pin joint.
Made the Connecting rod (using rectangle)
Connected Connecting rod to crank rod using pin joint.
Pin joints

5. Create a piston using rectangle.
Connect it to Connecting rod using Pin Joint.
Limited piston motion to vertical axes using vertical slot joint.

6. Attached a motor to the crank rod.
Double click motor to obtain motor property to change motor velocity
Motor

7. Results
Y Position of Piston
Angular Velocity of Connecting rod 60˚ = rad/sec
Piston 60 = in/sec