PROBLEM 3.
A POWER OF ONE THOUSAND KILOWATTS IS TO BE TRANSMITTED AT 800 RPM BY MEANS OF A STEEL SHAFT WITHOUT EXCEEDING A TORSIONAL STRESS OF 80 MPa OR TWISTING THROUGH MORE THAN 1° IN A LENGTH OF 20 DIAMETERS. DETERMINE THE FOLLOWING:
A) DIAMETER OF SOLID SHAFT REQUIRED
B) IF Di = 0.5 Do, WHAT HOLLOW SHAFT DIAMETERS ARE REQUIRED?
C) WHICH IS LIGHTER FROM A) AND B), AND BY WHAT PERCENTAGE? CONSIDER EQUAL LENGTH AND SAME MATERIAL.
C) SOLID SHAFT
B) HOLLOW SHAFT
PROBLEM 4.
A BELTED TRANSMISSION SYSTEM IS LOADED AS SHOWN. THE INPUT SHAFT TAKES ITS POWER FROM A 150 kW MOTOR THAT RUNS AT 100 RPM. THE OUTPUT SHFT DRIVES A CERTAIN MACHINERY EQUIPMENT.
DETERMINE THE FOLLOWING:
A) TORQUE AVAILABLE AT EACH OF SHAFTS A, B, AND C.
B) TORSIONAL STRESS INDUCED ON THE 60 mm DIAMETER OUTPUT SHAFT.
C) LENGTH OF BELT REQUIRED TO CONNECT EACH PAIR OF PULLEYS.
D) MAXIMUM BENDING MOMENT ON SHAFT B, CONSIDERING A BELT COEFFICIENT OF FRICTION OF 0.25.
