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Design a four-dwell cam to move a follower of mass == 1.25 bl from 0 to 2.5 inches in 40°, dwell for 100°, fall 1.5 inches in 90°, dwell for 20°, fall 0.5 inches in 30°, dwell for 40°, fall 0.5 inches in 30°, and dwell for the remainder. The total cycle must take 15 sec. Choose suitable programs for rise and fall to minimize dynamic forces and torques. Size a return spring and specify its preload to maintain contact between cam and follower. Calculate and plot the dynamic force and torque. Assume damping of 0.18 times critical. Repeat for a form-closed cam. Compare the dynamic force, torque, and natural frequency for the form-closed design and the force-closed design.
Using the predictive method of Angström-Page, estimate the monthly horizontal solar radiation for Miami, Florida, located at a latitude of 25°N.
Try to find the smallest such value of damping remembering that added damping is usually expensive.
helium is used to operate an 18 hp gas turbine. the gas enters the steady-flow device at 220 fts through an area of
Over the past year, a company has sold the following ten items. The following table shows the annual sales in units and the cost of each item.
determine the minimum coefficient of static friction between the uniform 50 kg spool and the wall so that the spool
(a) The tension in the crane's cable when the hull is submerged in the water, and (b) The tension when the hull is completely out of the water.
a steam power plant operates on a rankine cycle with reheat. steam enters the turbine at 600 psia and 700 f. steam is
An air bubble with a radius of 0.5 cm is released from the regulator of a scuba diver swimming 30 m below the sea surface. Estimate the radius of the bubble just before it reaches the water surface. Assume that the pressure inside the bubble is equal..
an ideal otto cycle heat engine with compression ratio 15.1 assume perfects gases with constant specifics heat. heat
cylinder a and cylinder b contain 0.07 grams of helium and 0.4 grams of oxygen respectively. each of these gases is
The motor nameplate of a wye-delta starter motor has a full load current of 287 amperes. What current rating should be used to determine the proper overload heater size?
air flow enters a constant-area insulated duct with a mach number 0.2. the duct diameter is 10 mm and the friction
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