Exposure calculator: hand-arm vibration

This calculator is designed to calculate daily exposure to hand-arm vibration for an activity longer than 30 min. It assesses occupational risk associated with exposure to hand-arm vibration, depending on whether a worker is at special risk.

 

 

 

The following quantities are used to measure exposure to hand-arm vibration:

a_hv - vector sum of frequency-weighted r.m.s acceleration,
ti - total duration (per day) of vibration exposure (longer than 30 min).

 

The left part of the calculator displays a bar chart with a value of the vector sum of frequency-weighted r.m.s acceleration (a_hv on the vertical axis) and exposure time (t on the horizontal axis). Daily vibration exposure is displayed in the upper part of the window and, graphically, in the right part of the window. The height of three bars reflects the values of daily vibration exposure, whereas colors reflect the results of occupational risk assessment. The first, widest bar represents workers who are not at special risk; the other bars represent young workers and pregnant women.

 

Color marking in occupational risk assessment:
green - low risk,
yellow - medium risk,
red - high risk.


Occupational risk assessment is performed in relation to the applicable limit values, specified in the Regulation of the Minister of Family, Labor and Social Policy of June 12, 2018 regarding the highest admissible concentrations and intensities of factors harmful to health in the work environment (Journal of Laws of 2018, item 1286). For pregnant women and young workers limit values are set out in the Regulation of the Council of Ministers of April 3, 2017 on the list of works that are onerous, dangerous or harmful to the health of pregnant women and women who breast-feed their baby (Journal of Laws 2017 item. 796) and the Regulation of the Council of Ministers of 5 July 2005 amending the regulation on the list of prohibited work for adolescents and the conditions of their employment for some of these works (Journal of Laws 2005, no. 136, item. 1145, last change Journal of Laws 2015 item 929)

Key bindings:

The value of the vector sum of frequency-weighted r.m.s acceleration is entered with the W and S keys. Exposure time (Te) is changed with the A and D keys.