The use of seating systems to reduce whole body vibration exposure in the SA industry

[摘要] ENGLISH ABSTRACT:The purpose of this study was to investigate the specification and use ofappropriate seating systems to reduce whole-body vibration exposure in typicalvehicles used in South African industry. As part of this study six suspensionseats, which the manufacturers claim satisfy the requirements in ISO 7096(2000), were tested. Six test subjects, three light and three heavy as specifiedin ISO 7096, were used to estimate the seat transmissibility functions in thevertical direction of the six different suspension seats. Transmissibilityfunctions were measured in the laboratory using two excitation levels, 1m/s2and 2 m/s2 r.m.s., of broadband frequency vibration and a spectrumapproximating the EM5 spectral class in ISO 7096. SEA T values werecalculated for operational vibration data measured in an articulated dump truckand a three-wheeled logger. It was shown that SEAT values for the EM1spectral class could not be reliably estimated from seat transmissibilityfunctions and need to be measured directly in the time-domain. Themeasurement procedures and seat selection criteria developed in this researchproject were used to compile a set of Design Guidelines for Seat Selection forWhole-Body Vibration Control in Industrial Vehicles. These guidelines willprovide manufacturers with an easy-to-implement methodology to controlwhole-body vibration transmitted to the operators of industrial vehicles and tocomply with international regulations for whole-body vibration transmission.

[发布机构] Stellenbosch University