Design, development and testing of a 2-DOF articulated dump truck suspension seat

[摘要] This project entails the design and development of a new 2-DOF articulated dumptruck (ADT) suspension seat. A study of the ADT vibration environment wasconducted using data measured with accelerometers inside the cabin. With thesystem's required operational capabilities determined, the concept design phaseresulted in a feasible concept. The first prototype was manufactured based on theinitial set of specifications.A variety of numerical modelling techniques were used to analyse and evaluatethe seat's dynamic response. Vertical and lateral laboratory tests of the suspensionseat with human occupants were completed. The vertical lumped parameter modelof the suspension seat with a human occupant gave good correlation with thelaboratory measured frequency response.A broad band input signal, and not the ISO 7096 (2000) EM1 signal, was used toobtain the frequency response used to verify the lumped parameter model. TheSEAT values for the ISO 7096 (2000) EM1 signal and various ADT roadconditions were calculated using the lumped parameter models for a small,medium and large subject, the same three subjects used in the laboratory tests.SEAT values using the ISO 7096 (2000) EM1 signal of 0.94, 0.93 and 0.88 wereobtained for the small, medium and large subjects. The lowest SEAT valuesobtained using the road data were 0.63, 0.56 and 0.48 for the small, medium andlarge subjects. The transmissibility curves determined from the lateral laboratorytests were used to calculate the SEAT values for the lateral ADT cabin vibrations.The lowest SEAT values obtained were 0.83, 0.83 and 0.82 obtained for the small,medium and large subjects.After all the results from the testing and modelling were evaluated the design wasassessed. All the data and information collected was used as input for the designof a second prototype, which was not manufactured. Not all the set specificationswere achieved for the first prototype, but the new suspension seat gave comparable vertical vibration isolation performance to that of expensivecommercially available ADT suspension seats. The lateral suspensiondemonstrated good lateral vibration isolation and is a feature not currentlyavailable in current ADT suspension seats.

[发布机构] Stellenbosch University