The load torque required by a 200-ton punch press is displayed in Table P16.4 for one revolution of the flywheel. The flywheel is to have a nominal angular velocity of 2 400 rev/min and to be designed for a coefficient of speed fluctuation of 0.075.

(a) Determine the mean motor torque required at the flywheel shaft and the motor horsepower needed, assuming a constant torque-speed characteristic for the motor.

(b) Find the moment of inertia needed for the flywheel.

Table P16.4 Torque data for Problem P16.4

θi Ti θi Ti θi Ti θi Ti deg in · lb deg in · lb deg in · lb deg in · lb 0 857 90 7 888 180 1 801 270 857 10 857 100 8 317 190 1 629 280 857 20 857 110 8 488 200 1 458 290 857 30 857 120 8 574 210 1 372 300 857 40 857 130 8 403 220 1 115 310 857 50 1 287 140 7 717 230 1 029 320 857 60 2 572 150 3 515 240 943 330 857 70 5 144 160 2 144 250 857 340 857 80 6 859 170 1 972 260 857 350 857