Analysis of Two Simulated In-field Chipping and Extraction Systems in Spruce Thinnings

Talbot, Bruce; Suadicani, Kjell

doi:10.1016/j.biosystemseng.2005.04.014

Cited by 43 publications

(22 citation statements)

References 17 publications

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“…Mobile chippers intended for chipping at various locations are often mounted on a truck chassis, and if they are to operate along the forest road network in wet and icy conditions they need a platform with rather good traction (e.g., four drive wheels on truck). In-field chippers are usually mounted on forwarders, with a separate power unit for the chipper, and a bin 15-20 m bin size and chipping productivity towards the cost-efficiency of a two-machine system with an in-field chipper and a bin forwarder [19]. In the present case, with 80 m transport distance and a relatively large chip bin on the forwarder mounted chipper, these two options were considered to have near equal economic performance and the single machine system was chosen.…”

Section: Chippingmentioning

confidence: 99%

“…This is a -hot‖ system, where any delays or disturbances on one part will have repercussions for others. If the truck inter-arrival time is too long, the chipper or chip shuttle comes to a stop, while if the chipper and shuttle are too slow, the interference time is transferred to the trucks [19]. This can reduce the machine utilization rate amongst actors.…”

Section: Road Transportmentioning

confidence: 99%

“…Research and development specifically focusing on this are geometric thinning patterns [11,12], shown to have considerable potential, especially when used in combination with continuous cutting devices [13], multi-stem handling and pre-bunching in the stand for further processing [14][15][16]. Options for extraction including by forwarder [17,18], chipping in-field and extraction [19], and bundling of whole trees in-field [20,21] are methods with varying efficiencies in small trees.…”

Section: Introductionmentioning

confidence: 99%

“…Simulation has been demonstrated to be a useful tool for modelling biomass supply chains as it can both be used to replicate actual machine movement and productivity [11,22], interaction between machines in a system [19] or the evaluation of alternative components and sub-systems in a supply chain perspective [23].…”

Section: Introductionmentioning

confidence: 99%

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Systems Analysis of Ten Supply Chains for Whole Tree Chips

Belbo¹,

Talbot²

2014

Forests

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Whole trees from energy thinnings constitute one of many forest fuel sources, yet ten widely applied supply chains could be defined for this feedstock alone. These ten represent only a subset of the real possibilities, as felling method was held constant and only a single market (combustion of whole tree chips) was considered. Stages included in-field, roadside landing, terminal, and conversion plant, and biomass states at each of these included loose whole trees, bundled whole trees or chipped material. Assumptions on prices, performances, and conversion rates were based on field trials and published literature in similar boreal forest conditions. The economic outcome was calculated on the basis of production, handling, treatment and storage costs and losses. Outcomes were tested for robustness on a range of object volumes (50-350 m 3 solid ), extraction distances (50-550 m) and transport distances (10-70 km) using simulation across a set of discrete values. Transport was calculated for both a standard 19.5 m and an extended 24 m timber truck. Results showed that the most expensive chain (roadside bundling, roadside storage, terminal storage and delivery using a 19.5 m timber truck) at 158 € t d −1 was 23% more costly than the cheapest chain (roadside chipping and direct transport to conversion plant with container truck), at 128 € t d −1 . Outcomes vary at specific object volumes and transport distances, highlighting the need to verify assumptions, although standard deviations around mean supply costs for each chain were small (6%-9%). Losses at all stages were modelled, with the largest losses (23) occurring in the chains including bundles. The study makes all methods and assumptions explicit and can assist the procurement manager in understanding the mechanisms at work. OPEN ACCESSForests 2014, 5 2085

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Section: Chippingmentioning

confidence: 99%

Section: Road Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Systems Analysis of Ten Supply Chains for Whole Tree Chips

Belbo¹,

Talbot²

2014

Forests

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“…Chipping operation systems in thinning were also analyzed by evaluating bin size, chipper productivity, in-field extraction distance and forest-road haulage distance [Talbot 2005], while multi-stem the mechanized harvesting operation was analyzed under the South Africa condition by comparing the current system to two hypothetical systems. One of the alternative systems was based on modifying the operation procedures but by considering the same machines and equipments of the current system, the second one by changing also the machine and the equipment [Hogg 2010].…”

Section: Introductionmentioning

confidence: 99%