Vibrometry - Fundamentals and Assessment Tools for Occupational Ergonomics - page 661

1000

500

200

100

50

20

10

5

2

1

8 16 31.5 63 125 250 500 1000

Third-Octave Band Center Frequency, Hz

FIGURE 33.8 Hand-arm vibration curves for the separate evaluation of X,Y,Z axes rms accelerations (see text).
(ANSI S3.34.)

The architects of the other HAV standards are carefully making adjustments to their standards with
regard to the special case of these very high-speed tools as the vibration data and corresponding
HAVS health data become available. We recommend the use of ANSI S3.34, ACGIH-TLV for HAV
and the EU criteria since all provide good overall guidance, and in the special case where very high-speed
tools are to be tested caution is advised when evaluating the triaxial vibration test data.

TABLE 33.1 ACGIH Threshold Limit Values for Exposure of the Hand to Vibration
in X, Y, Z Directions

Values of the Dominant, b Frequency-
Weighted, rms, Component Acceleration Which
Shall Not Be Exceeded
a K ,(a K eq )

Total Daily Exposure Duration a m / s 2

g

4 hours and less than 8 4 0.40

2 hours and less than 4 6 0.61

1 hour and less than 2 8 0.81

Less than 1 hour 12 1.22

sec 2 . Note: 1 g ¼ 9.81 m /

a The total

time vibration enters the hand per day, whether continuously or

intermittently.
b Usually one axis of vibration is dominant over the remaining two axis.
If one or more vibration axis exceeds the Total Daily Exposure then the TLV has been
exceeded.
Courtesy of ACGIH.