An athletic footwear manufacturer wants a device to test rubber heels for their ability to withstand millions of cycles of force similar to that which a walking human's foot applies to the ground. Figure P8-6 shows a typical walker's force-time function and a pressure-volume curve for a piston-acumulator. Design a cam-follower system to drive the piston in a way that will create a force-time function on the heel similar to the one shown. Choose suitable piston diameters at each end.

An athletic footwear manufacturer wants a device to test rubber heels for their ability to withstand millions of cycles of force similar to that which a walking human's foot applies to the ground. Figure P8-6 shows a typical walker's force-time function and a pressure-volume curve for a piston-acumulator. Design a cam-follower system to drive the piston in a way that will create a force-time function on the heel similar to the one shown. Choose suitable piston diameters at each end.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

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An athletic footwear manufacturer wants a device to test rubber heels for their ability
to withstand millions of cycles of force similar to that which a walking human's foot
applies to the ground. Figure P8-6 shows a typical walker's force-time function and a
pressure-volume curve for a piston-accumulator. Design a cam-follower system to
drive the piston in a way that will create a force-time function on the heel similar to
the one shown. Choose suitable piston diameters at each end.
Human Walking Force
System Pressure-Volumc Function
Force
120
Ib
Pump
120 -
pressure
psi
80 +
80 -
30 psi/n?
40
40
Time
0
T= 0.5 sec
Stroke volume in
(a)
(b)
Pump body
- Accumulator
Heel
Spring
Follower
Piston
Piston
Cam
Oil
(c)
FIGURE P8-6

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