ANSYS varification manual 9

# 1 2 reduced harmonic response analysis antype 3

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Unformatted text preview: o allow the abrupt changes in acceleration to be followed reasonably well, and to produce sufficient printout for the theoretical comparison. The initial velocity is produced by a force = vo ρA / ITS = 1,825,000 lb acting over 4 ITS and distributed among the MDOF. A "coasting" period of 60 ITS is allowed before the gap (so = 0.64 in) closes at impact. An expansion pass is done at t = to + t1 to obtain the stress solution. POST26 is used to get the displacement solution and displays versus time. Results Comparison Target[1] d, in (t = 0.05573 sec) 4.9329 - - d, in (t = 0.0544 sec) - 4.7734[3] 0.968 - 4.7474[4] 0.962 stressx , psi (t = 0.05573 sec) 14799. - - stressx , psi (t = 0.0557 sec) Expansion Pass Ratio d, in (t = 0.0557 sec) Reduced Transient Dynamic ANSYS[2] - 14820.[5] 1.001 • t is time before contact (0.0064 sec) included. • d is relative displacement between the ends of the bar. 1. Assumes an infinitely rigid stop. 2. Uses a high, but finite stiffness for the stop. 3....
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