Ogilvie 



10 20 30 40 50 60 70 80 90 K. 



CONVOLUTION OF SPECTRUM, S(f) 



Figure 19 



0.4 



0^0.2 



0.1 



li . . I. 



• LINEAR S-^i^qM 



o NON-LINEAR (±/3(^2) S</)ji^Jo)) 



i . . I . . I. 



10 II 



Fig. 20 - Computed spectrum of non- linear rolling 



124 



