45 On the Behaviour of Structures with Many Nonlinear Elements 513 0 5 10 15 20 25 30 35 40 45 Frequency (Hz) 10-5 10-4 10-3 Magnitude Type A Type B Type C Analytical Linear Fig. 45.4 Figure showing comparison of FRFs produced for three characteristic types of nonlinear 3DOF system 0 5 1015202530354045 Frequency (Hz) 10-20 10-10 100 Magnitude 1 N 10 N 50 N 100 N 250N 500 N 750 N 1000 N 1250 N 1500 N 1750 N 2000 N Forcing Frequency Fig. 45.5 Response of a SDOF linear system to varying magnitude 4 Hz sine wave input 0 5 1015202530354045 Frequency (Hz) 10-20 10-10 100 Magnitude 1 N 10 N 50 N 100 N 250N 500 N 750 N 1000 N 1250 N 1500 N 1750 N 2000 N Forcing Frequency Fig. 45.6 Response of a SDOF system with a cubic nonlinearity at mass 1 to varying magnitude 4 Hz sine wave input
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