A torsion-bar spring consists of a prismatic bar, usually of round cross section, that is twisted at one end and held fast at the other to form a stiff spring. An engineer needs a stiffer one than usual and so considers building in both ends and applying the torque somewhere in the central portion of the span, as shown in the figure. This effectively creates two springs in parallel. If the bar is uniform in diameter, that is, if d = d 1 = d 2 , ( a ) determine how the spring rate and the end reactions depend on the location x at which the torque is applied, ( b ) determine the spring rate, the end reactions, and the maximum shear stress, if d = 0.5 in, x = 5 in, l = 10 in, T = 1500 lbf · in, and G = 11.5 Mpsi. Problem 4–3
A torsion-bar spring consists of a prismatic bar, usually of round cross section, that is twisted at one end and held fast at the other to form a stiff spring. An engineer needs a stiffer one than usual and so considers building in both ends and applying the torque somewhere in the central portion of the span, as shown in the figure. This effectively creates two springs in parallel. If the bar is uniform in diameter, that is, if d = d 1 = d 2 , ( a ) determine how the spring rate and the end reactions depend on the location x at which the torque is applied, ( b ) determine the spring rate, the end reactions, and the maximum shear stress, if d = 0.5 in, x = 5 in, l = 10 in, T = 1500 lbf · in, and G = 11.5 Mpsi. Problem 4–3
Solution Summary: The author shows the free body diagram of the torsion bar. The spring rate depends on the location at which the torque is applied.
A torsion-bar spring consists of a prismatic bar, usually of round cross section, that is twisted at one end and held fast at the other to form a stiff spring. An engineer needs a stiffer one than usual and so considers building in both ends and applying the torque somewhere in the central portion of the span, as shown in the figure. This effectively creates two springs in parallel. If the bar is uniform in diameter, that is, if d = d1 = d2, (a) determine how the spring rate and the end reactions depend on the location x at which the torque is applied, (b) determine the spring rate, the end reactions, and the maximum shear stress, if d = 0.5 in, x = 5 in, l = 10 in, T = 1500 lbf · in, and G = 11.5 Mpsi.
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Brake Specific Fuel Consumption - 0.3 kg/kwh,
Mechanical Efficiency- 90%
Calorific Value of Fuel -45 MJ/kg.
Given these values, find the indicated power, indicated thermal efficiency and brake thermal efficiency
Problem 6. The circular plate shown rotates about its vertical diameter. At the instant shown, the
angular velocity ₁ of the plate is 10 rad/s and is decreasing at the rate of 25 rad/s². The disk lies
in the XY plane and Point D of strap CD moves upward. The relative speed u of Point D of strap
CD is 1.5 m/s and is decreasing at the rate of 3 m/s².
Determine (a) the velocity of D, (b) the acceleration of D.
Answers: =0.75 +1.299]-1.732k m/s a=-28.6 +3.03-10.67k m/s²
200 mm
x
Z
Chapter 4 Solutions
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
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