Abstract
The transmission of vibration from a handle to twelve test points located on the volar side of the hands of five females and five males was determined with laser technique for non-contact measurement of vibration. The excitation level was almost constant (0.01 m/srms) within the frequency range of 12.5 to 1250 Hz. The grip force exerted by the subjects was 10 N.
Vibration at frequencies below 40 Hz was in general transmitted to all test points without any noticeable attenuation.-Far higher frequencies and for test points adjacent to the wrist the transmission of vibration decreased with the frequency (5 dB/octave). For test points on the nails of the middle finger and thumb the un-attenuated frequency range was extended up to about 500 Hz. For other test points a more complicated pattern was observed and in the frequency range of 40–160 Hz, vibration was seen to be either fully transmitted or even amplified Only small and unclear differences in vibration transmission between females and males were observed.
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