The Optimum Slash Pile Size for Grinding Operations: Grapple Excavator and Horizontal Grinder Operations Model Based on a Sierra Nevada, California Survey

Yoshioka, Takatomo; Sakurai, Rin; Kameyama, Shohei; Inoue, Koki; Hartsough, Bruce R.

doi:10.3390/f8110442

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…64.80 AUD odt −1 : Base case or reference price value. This value is based on international references and personal communication [74,77] 50.40 AUD odt −1 : Low-price case according to a review case in Australia [12] 79.00 AUD odt −1 : High-price case according to a case example in the Green Triangle, Australia [69].…”

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confidence: 99%

A Two-Stage DSS to Evaluate Optimal Locations for Bioenergy Facilities

Holsbeeck

Ezzati

Röser

et al. 2020

Forests

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Research Highlights: A set of 128 potential bioenergy facility locations is established and evaluated based on the transport cost to select optimal locations. Background and Objectives: The identification of optimal facility locations to process recovered forest biomass is an important decision in designing a bioenergy supply chain at the strategic planning level. The result of this analysis can affect supply chain costs and the overall efficiency of the network, due to the low density and dispersed nature of forest biomass and the high costs associated with its logistics operations. In this study, we develop a two-stage decision support system to identify the optimal site locations for forest biomass conversion based on biomass availability, transport distance and cost. Materials and Methods: In the first stage, a GIS-based analysis is designed to identify strategic locations of potential bioenergy sites. The second stage evaluates the most cost-effective locations individually using a transportation cost model, based on the results from stage one. The sensitivity of inputs, such as maximum allowable transport cost, the distance of transport and their relations to the profit balance, and changes in fuel price are tested. The method is applied to a real case study in the state of Queensland, Australia. Results and Conclusions: The GIS analysis resulted in 128 strategic candidate locations being suggested for bioenergy conversion sites. The logistics analysis estimated the optimal cost and transportation distance of each one of the locations and ranked them according to the overall performance between capacities of 5 and 100 MW.

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confidence: 99%

A Two-Stage DSS to Evaluate Optimal Locations for Bioenergy Facilities

Holsbeeck

Ezzati

Röser

et al. 2020

Forests

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“…With respect to the other parameters acquired from the time study, the time for installation and withdrawal, a, the time for felling a tree, f, the moving velocity of the felling head, v, and the maximum number of trees that could be held at a time, h, were set to be 270 s, 10 s, 0.57 m/s and 8, respectively, based on Table 3. The simulation model for calculating the cycle time of the harvesting operation was completed assuming that the machine's moving velocity, b, and the time for chipping, c, were 5 m/s and 10 s [27], respectively; thus, the productivity of harvesting could be calculated. Finally, the harvesting cost per BDT of small-diameter trees, HC(L, n) of Equation (2), was calculated by dividing the sum of the hourly costs of the two machines (listed in Tables 4 and 5 as 12,250 JPY/h (= 7173 JPY/h for the first machine plus 5077 JPY/h for the second machine), by the harvesting productivity, HP(L, n), calculated from Equation (1).…”

Section: Results Of the Harvesting Experimentsmentioning

confidence: 99%

“…The second machine, equipped with a container, followed after the first one to receive the comminuted wood chips. Such a machine as the first one shown in Figure 2 has never been in operation in Japan; thus, a harvesting experiment (felling and accumulating) was conducted in this study while the data related to the chipping operation were referred to from the previous study by the authors of this paper [27]. Figure 3 contains a flow chart outlining one cycle of the harvesting operation that consists of the felling, accumulating and chipping processes.…”

Section: Assumed Simplified Model Forest and Harvesting Systemmentioning

confidence: 99%

Feasibility of a Harvesting System for Small-Diameter Trees as Unutilized Forest Biomass in Japan

Yoshioka

Tomioka

Nitami

2021

Forests

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In order to secure a supply of forest biomass, as well as promote further utilization following the completion of the Feed-in-Tariff Scheme for Renewable Energy (FIT), small-diameter trees such as cleanings from young planted forests and broad-leaved trees from coppice forests are prospective resources in Japan. The goal of this study was to discuss effective methods for harvesting the small-diameter trees that are unutilized forest biomass in Japan. This study assumed a simplified model forest and conducted experiments and time studies of the harvesting of small-diameter trees with a truck-mounted multi-tree felling head. As a result, the machine used in the experiment could fell a maximum of six trees inward in a row from a forest road. However, the harvesting cost (felling, accumulating and chipping) was cheapest when the machine felled five trees inward in a row. Lengthening the maximum reach of a felling head to fell trees deeper inward in a row appeared effective in increasing the number of harvested trees. From the perspective of minimizing the harvesting cost, however, there were upper limits to the number of trees felled inward as well as to the maximum reach of a felling head. The results of a sensitivity analysis suggested the following machine improvements could be considered in future policy: increasing the moving velocity of a felling head and the maximum number of trees that can be held at a time are effective if it is possible to lengthen the maximum reach of a felling head. Meanwhile, shortening the machine’s moving time among operation points is also effective if the maximum reach of a felling head cannot be lengthened.

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“…Feedstock concentration is known to have a very strong impact on forwarder productivity (Manner et al 2013). Similarly, pile size affects forwarding (Väätäinen et al 2006) and comminution (Yoshioka et al 2017) productivity alike. A logical conclusion is that the residue available on the experimental site was too little and too sparse for efficient chipping, especially if the machine took as long to re-position as the chipper truck used for the study.…”

Section: Discussionmentioning

confidence: 99%

Logging residue chipping options for short rotation poplar plantations

Spinelli¹,

Mihelič²,

Kováč³

et al. 2023

iForest

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Short rotation poplar plantations grow on flat and even terrain, and the interrow spacing is wide enough for easy machine access. If the terrain is firm enough, one may consider moving the classic roadside chipping operation directly into the field (i.e., terrain chipping), thus saving on wood extraction cost. This study compared the efficiency and cost of roadside and terrain chipping conducted with exactly the same equipment, to assess the benefits offered by the versatile deployment of a standard chipping operation, whereby the operation can be moved inside the stand whenever terrain conditions are suitable. The study was conducted at 12 sample plots, containing about one truck load of chips each (i.e., approximately 11 bone-dry tons or BDT). Plots were arranged as alternate windrows on a 8.5 ha field. Data was collected for the whole supply chain, from field to factory. The factory was located 14 km from the field. Delivered cost was 53 € BDT -1 and 70 € BDT -1 for roadside and terrain chipping, respectively, i.e., terrain chipping was 1/3 more expensive than roadside chipping, even if the latter included the additional cost of forwarding the residues to the roadside. The chipper-truck used for the test could not cope with small scattered residue piles (32 BDT ha -1 ), and the cumbersome reposition maneuver became the main hurdle to efficient operation. Further improvements might be achieved by pre-bunching the residues, introducing a dedicated terrain chipper or bundling the residues and taking the bundles to the factory for centralized chipping.

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The Optimum Slash Pile Size for Grinding Operations: Grapple Excavator and Horizontal Grinder Operations Model Based on a Sierra Nevada, California Survey

Cited by 6 publications

References 17 publications

A Two-Stage DSS to Evaluate Optimal Locations for Bioenergy Facilities

A Two-Stage DSS to Evaluate Optimal Locations for Bioenergy Facilities

Feasibility of a Harvesting System for Small-Diameter Trees as Unutilized Forest Biomass in Japan

Logging residue chipping options for short rotation poplar plantations

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