Design and testing of stand-specific bucking instructions for use on modern cut-to-length harvesters

Kivinen, Veli-Pekka

doi:10.14214/df.37

Cited by 13 publications

(13 citation statements)

References 44 publications

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“…Bucking problems are well studied in the literature [14][15][16]. However, few models of WPPP including bucking decisions have been reported in the field of wood procurement planning.…”

Section: Wood Procurement Planning Problemmentioning

confidence: 99%

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A hybrid constraint programming approach to a wood procurement problem with bucking decisions

2015

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In this article, we present a wood procurement problem that arises in Eastern Canada. We solve a multi-period wood supply planning problem, while taking into account bucking decisions. Furthermore, we present a new form of flexibility which allows the harvesting capacity to change from one time period to another. We study the impact of such flexibility upon the harvesting cost. We assess the performance of the problem by comparing it with a variant where the harvesting capacity is fixed during sites' harvesting. To address this problem, we develop a hybrid approach based on both constraint and mathematical programming. In the first phase, we propose a constraint programming model dealing with forest sites harvesting and bucking problems. The result of this model is used as part of an initial solution for the whole problem formulated as a mixed integer model. We test the two versions of the problem on a set of different demand instances and we compare their results.

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“…Bucking problems are well studied in the literature [14][15][16]. However, few models of WPPP including bucking decisions have been reported in the field of wood procurement planning.…”

Section: Wood Procurement Planning Problemmentioning

confidence: 99%

“…Bucking Bucking is the operation of cutting tree stems into smaller pieces (logs) to be used in further industrial processing [2,14]. When this operation is done directly in forest using cut-to-length machinery such as harvesters and forwarders, we talk about cut-tolength bucking.…”

Section: Harvesting Activitiesmentioning

confidence: 99%

A hybrid constraint programming approach to a wood procurement problem with bucking decisions

2015

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“…There have been numerous relevant studies concerning simulation in forest engineering, for example in timber harvesting, timber transportation and logistics, bucking optimization and forest machine modification and innovation (Table 10). LeDoux and Butler 1981;Stuart 1981;Vanclay 1994;Asikainen 1995;Wang and Greene 1996;Sikanen 1999;Wang and Greene 1999;Hartsough et al 2001;Wang and Ledoux 2003;Talbot et al 2003;Väätäinen et al 2006;Hogg 2009;Asikainen et al 2010;Wolferstetter 2010;Väätäinen 2010;Lamminen et al 2010;Hogg et al 2010 Timber transportation and logistics Asikainen and Tolvanen-Sikanen 1995;Gallis 1997;Asikainen 1998;Asikainen 2001;Väätäinen et al 2005;Fjeld 2012a;Fjeld 2012b Bucking optimization Uusitalo et al 2004;Nordmark 2005;Kivinen 2007;Malinen et al 2007;Wilhelmsson et al 2012 Machine modification and innovation Löfgren 2003;Brander et al 2004;Servin et al 2008;Robmann and Alves 2009;Ersson et al 2012 The trend of simulation used in forest operations shows that, in the beginning, simulation was mainly applied to logging operations, with some studies carried out in timber transportation in the late 1990s (Table 11). The interest in applying simulation in timber harvesting activities declined after the 2000s.…”

Section: Simulations In Forest Operationsmentioning

confidence: 99%

Harvesting operations in eucalyptus plantations in Thailand

Manavakun¹

2014

Diss. For.

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To be presented with the permission of the Faculty of Agriculture and Forestry of the University of Helsinki for public criticism in the Walter Auditorium of the EEbuilding (Agnes Sjöbergin katu 2) on May 28 th , 2014, at 12 o'clock noon. ABSTRACTThe eucalyptus has recently become an important timber species in Thailand, particularly in relation to timber supply within the pulp industry. Demand for raw material is continuously increasing, but harvesting techniques continue to rely on old-fashioned methods of harvesting, which are motor-manual and labour-intensive operations. These harvesting operations typically provide relatively low productivity and are time consuming. This study addressed the timber harvesting potential in Thailand including: average productivity, identifying ineffective work phases, and how work performance can be improved. Therefore, the study was conducted to analysis existing timber harvesting systems as a whole and compare alternatives, and to explore improvements in forest harvesting systems in Thailand through work study, working postures analysis, and simulation. Work study allowed the researcher to understand in detail the conventional harvesting systems and obtain information regarding work activities and time allocations. Harmful tasks and awkward working postures were evaluated by working posture analysis. Simulation allowed the researcher to examine the impact of changing harvesting systems. The study confirmed that motor-manual operations have rather low production rates compared to intermediate and fully mechanized harvesting techniques, which are applied in other parts of the world. The most unproductive work phase is cross-cutting, and further research should pay attention to this work phase. According to the working postures analyses, the most problematic working postures found for manual tasks included stacking, delimbing, and loading. Simulation findings suggested that reorganization of job sequences is one major possibility for improving productivity. Log length and tree size also displayed a significant effect on overall productivity. Further research should consider enhancing the system with partial mechanization, such as farm tractors, skidders and multi-tree-handling harvesters. Education and training are also important measures to increase not only work performance, but also to improve work safety.

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“…Not only are these systems able to acquire diameter and length of the material fed through the harvesting head but they can also calculate the optimal arrangement pattern of various products based on the derivable profile of the tree combined with the specifications of the target assortments (Kivinen 2004). Kivinen (2007) and Marshall (2007) provided an overview on existing mathematical and methodical approaches to the challenges of optimal tree bucking. The principle to make a prediction for the profile of the entire merchantable stem is actually based on the measurement of a first short segment, normally located at the butt end of the stem (Liski and Nummi 1995;Kivinen and Uusitalo 2002).…”

Section: Introductionmentioning

confidence: 99%

“…With the use of OBC optimizations systems, two main matrices can be used as input for decision making; price-matrix or a combination of the price-matrix and a demand-matrix. When the aim is to maximize the value of a stem by an optimal assortment-formation, the method is called buck-to-value (Marshall 2005;Kivinen 2007;Dems et al 2013). The base for calculations is through the input of a price-matrix for the assortments to be processed, differentiated by length and diameter (Liski and Nummi 1995).…”

Section: Introductionmentioning

confidence: 99%

Creation of value through a harvester on-board bucking optimization system operated in a spruce stand

Labelle¹,

Huss²

2018

Silva Fenn.

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Design and testing of stand-specific bucking instructions for use on modern cut-to-length harvesters

Cited by 13 publications

References 44 publications

A hybrid constraint programming approach to a wood procurement problem with bucking decisions

A hybrid constraint programming approach to a wood procurement problem with bucking decisions

Harvesting operations in eucalyptus plantations in Thailand

Creation of value through a harvester on-board bucking optimization system operated in a spruce stand

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