Effects of altering the palm adapter geometry on the results of ISO 10819 antivibration glove tests have been investigated at the University of Nevada, Las Vegas, Center for Mechanical and Environmental System Technology laboratory (CMEST). 30 rigid acrylic adapters were designed, fabricated, and evaluated. For an adapter to be acceptable for ISO 10819 glove vibration transmissibility tests, the adaptor linear vibration transmissibility in each 1/3 octave frequency band from 16-1,600 Hz, averaged over all test subjects, had to be between 0.95 and 1.05.
The palm adapters that met the acceptability criteria had similar adaptor vibration transmissibility results. The length of the adapters covered 70-80% of the width of the palm. The upper curvature of the adaptors was greater than or equal to the radius specified in ISO 10819:1996. Adaptors with a flat-topped profile also met the acceptability criteria.
Six adaptors were selected to conduct glove vibration transmissibility tests on three commercially available antivibration gloves according to the procedures outlined in ISO 10819:1996. Four adaptors met the adaptor acceptability criteria. Two adapters did not meet the criteria. Glove vibration transmissibility tests were also conducted using a constant velocity vibration input that had a value of 0.01 m/s in each 1/3-octave frequency band from 16-1,600 Hz. This spectrum was referred to as the F spectrum.
Glove vibration transmissibility results obtained using the M (16-400 Hz) and H (100-1,600 Hz) spectra specified in ISO 10819:1996 were compared to similar results using the constant velocity F spectrum. The results obtained from the F spectrum when divided into the M and H frequency ranges were nearly the same as those obtained from the ISO 10819 M and H spectra.
Test subject training was required to ensure reliable glove vibration transmissibility results. The measured transmissibility values obtained with the M, H, and F spectra were all higher at the beginning of the test program. The transmissibility values decreased and approached lower limiting values as the test subjects became more experienced.