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90 <br /> OTA <br /> 80 lb <br /> cr <br /> I ` <br /> ui <br /> w <br /> E 7,0— <br /> w <br /> O w Z •® ® •® <br /> CL ® TIRES ®®•% <br /> o -- . ® <br /> z x 60 <br /> 0 ENGINE `®`% <br /> cv <br /> N w EXHAUST ` ®®\ <br /> Q V SO <br /> ® v <br /> w TIRES 77 d8A <br /> v ao EXHAUST 79 d8A <br /> ® ENGINE 75 d8A <br /> TOTAL 82 d8A <br /> 331.5 63 125 250 500 1000 2000 4000 $000 <br /> OCTAVE BAND CENTER FREQUENCY (Hz) <br /> FIGURE 3.4 HYPOTHETICAL MIXTURE OF THE THREE PRINCIPAL SOURCES <br /> OF TRUCK NOISE. N015E LEVELS WILL VARY FOR <br /> DIFFERENT COM?ONENTS IN DIFFERENT TRUCKS <br /> to <br /> EXHAUST <br /> 9 79d8A <br /> w <br /> w <br /> U. <br /> Q 7 <br /> 3 <br /> Q6 <br /> !r <br /> w S <br /> 0> ENGINE <br /> ® , 75d8A <br /> a <br /> 1- 3 <br /> 00 00 <br /> w2 <br /> S <br /> r ill <br /> t TIRES <br /> of <br /> 77 d8A <br /> 82 d8A = TOTAL <br /> FIGURE 3.5 REPRESENTATION OF TRUCK NOISE COMPONENTS OF <br /> FIGURE 2.4, RELATIVE TO HEIGHT ABOVE THE ROADWAY <br />