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EVALUATION OF HUMAN EXPOSURE TO WHOLE-BODY VIBRATION - VERIFICATION METHOD OF STEVENS'S POWER LAW

Laurențiu Picu

Abstract

The purpose of this paper is to evaluate human exposure to whole-body vibration on a ship and to find a relationship between the value of the vibration parameters transmitted by a ship sailing on the Danube to the sailors and the magnitude of their perception. Experimental: A) Whole body vibrations transmitted to sailors working on a ship sailing on the Danube were measured. The experiments were made in the summer and the Danube had small waves. There were 3 subjects that were placed successively for 30 minutes in the engine room, main deck and upper deck. The accelerations on the 3 axes were measured and then, for each subject, the following averages were calculated: acceleration r.m.s., partial exposure A (8), total exposure A (8). B) Using the Likert scale the discomfort of each subject was assessed in the 3 areas where the determinations were made. Results and conclusions: A) The results have shown that in all cases the measured and calculated values far exceed the values indicated by the Directive 2002/44/EC and ISO 2631, especially in the engine room (where the following averages were found: acceleration Oz axis az=2.837 m/s2; acceleration r.m.s. Aw=4.794 m/s2; partial exposure A(8)=1.198 m/s2. B) For all subjects, the discomfort (D) increases with the acceleration r.m.s. (A), according to Stevens? Power Law. For example, subject 2 (with the highest Body Mass Index) has k = 4.9, unlike the others who have k= 4.4. In the engine room, where the vibrations are very high, b= 0.023 while the main deck and the upper deck . These results confirm that k is a constant that depends on the subject intrinsic parameters and ? is the exponent dependent on the vibration parameters. ? = 0 .019. ? = 0.0163. These results confirm that k is a constant that depends on the subject intrinsic parameters and ? is the exponent dependent on the vibration parameters.

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DOI resolver: doi.org/10.5593/sgem2018/5.2/s20.055

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