Modelling of influence of local vibration on operator's hands

Abstract

Operation of machines and mechanisms, which installed power per employee constantly grows, connected also influence of local vibration on the operator. As a result of long and uncontrolled influence lines of operators have proof vibrating illness, and instant influence may result in a trauma. Computer modelling of reactions of the person at influence on him vibrations allows to study mechanisms of such interaction and further at designing machines and mechanisms to lower a level of vibration influence. Vibrating protection of the man represents a complicated problem which can be decided with using of biomechanical examinations and build-ups of mathematical models. Limits of safe and permissible vibrating action on man now set. From the point of view of a mechanics a human body only a mechanical system having particular natural frequencies. However, making of adequate mathematical model of a human body is complicated that the parameters featuring dynamic properties change in time. Having presented a human body as the composite dynamic structure with parameters varied in time, it is possible to spot resonant frequencies which cause growth of vibration amplitudes both all body and separate parts.