INTENSITY JUDGEMENTS OF NON-SINUSOIDAL VIBRATIONS - SUPPORT FOR ISO WEIGHTING METHOD

  • 1 January 1978
    • journal article
    • research article
    • Vol. 49  (11) , 1327-1330
Abstract
Three experiments [Exp.] were conducted to compare the independent component method and the weighting method recommended by current vibration standards for evaluating complex vibrations. Seated subjects [human] matched their perceptions of the intensity of various Z-axis vibrations by adjusting the intensity of a sinusoidal matching frequency. Exp. I stimuli were composed of 1-4 sinusoids in the frequency range of 11-63 Hz; Exp. II stimuli were made up of 1-4 3rd-octave bands of random vibration with center frequencies of 16-40 Hz; and Exp. III stimuli were composed of 1-4 sinusoids of 2.6-16 Hz. In all 3 Exp, the acceleration of the matching response increased significantly as the number of sinusoids or 3rd-octave bands in the stimulus increased. Such a relationship was not predicted by the independent component method, but was predicted by the weighting method. When the weighted accelerations of the matching responses were compared with the weighted accelerations of the input vibrations, the correspondence was quite good for all 3 experiments. These results support adoption of the weighting method as the preferred procedure for evaluating complex vibration environments.

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