The expansion joints of a concrete highway are 45 ft apart. These joints cause a series of impulses at equal intervals to affect cars traveling at a constant speed. Determine the speeds at which pitching motion and up-and-down motion are most apt to arise for the automobile of Problem.
Problem
The following information is given for the automobile shown in Figure.
W=3500lb
l1=4.4ft
l2=5.6ft
k1=2000lb/ft
k2=2400lb/ft
r=4ft
Determine the normal modes of vibration and locate the node for each mode.
