Abstract
Based on the complete dynamic calculation method, the layout, force, and strength of harvester boom cylinders were designed and calculated. Closed simulations for the determination of the dynamic responses of the harvester boom during luffing motion considering the cylinder drive system and luffing angle position control have been realized. Using the ADAMS mechanical system dynamics analysis software, six different arm poses were selected and simulated based on the cylinder as the analysis object. A flexible model of the harvester boom luffing motion has been established. The movement of the oil cylinder under different conditions were analyzed, and the main operation dimensions of the harvester boom and the force condition of the oil cylinder were obtained. The calculation results show that the dynamic responses of the boom are more sensitive to the luffing acceleration, in comparison with the luffing velocity. It is seen that this method is very effective and convenient for boom luffing simulation. It is also reasonable to see that the extension of the distance of the bottom of the boom is shortened by adjusting the initial state of the boom in the working process, which can also effectively reduce the workload of the boom—thus improving the mechanical efficiency.
Highlights
Harvesters are employed effectively in level-to-moderately steep terrain for clearcutting areas of forest [1,2]
Dynamic force can be generated in the drive system during starting or braking, which is harmful to the safety of the crane, and to the crane driver’s health
Most of the published articles concentrate on dynamic responses of booms during rotating and hoisting motions, such as Guangfu Sun’s [5] research of the lifted load motion considering changes in rotating, booming, load hoisting, and support system
Summary
Harvesters are employed effectively in level-to-moderately steep terrain for clearcutting areas of forest [1,2]. For very steep hills or for removing individual trees, humans working with chain saws are still preferred in some countries. In northern Europe, small and maneuverable harvesters are used for thinning operations, and manual felling is typically only used in extreme conditions where tree size exceeds the capacity of the harvester head or by small woodlot owners [3]. Because of the payload of the suspender, the motion of the pendulum and the dynamic force can be very significant. For this reason, many crane dynamics studies have been reported in the literature [4]. Chin et al [6]
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