MIT2_007s09_sol_exam02A

# MIT2_007s09_sol_exam02A - MIT OpenCourseWare...

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MIT OpenCourseWare http://ocw.mit.edu 2.007 Design and Manufacturing I Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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Page 2 of 13 2. (10 points) You fill a one liter container with air at 60 psi gauge pressure and plan to use it as a source of power for a machine. The air in the bottle is at thermal equilibrium with the air in the room at 20 degree Centigrade. Estimate the force applied if a valve is opened connecting the reservoir of air to a piston with a three inch internal diameter and a four inch throw. First, consider the case that the air flow is minimal, for example if the actuator is used to apply a force at the beginning of its throw. If we assume the volume of the pneumatic lines is small compared to the one liter reservir, then 60 psi is applied to the face of the piston. The piston has a three inch diameter, about 7 square inches of area, and therefore 7in^2*60psi=420 pounds of force would be applied.

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## This note was uploaded on 02/23/2012 for the course MECHANICAL 2.004 taught by Professor Derekrowell during the Fall '08 term at MIT.

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MIT2_007s09_sol_exam02A - MIT OpenCourseWare...

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