Assessing the Utility of Two Integrated Harvester-Forwarder Machine Concepts Through Stand-Level Simulation

Talbot, Bruce; Nordfjell, Tomas; Suadicani, Kjell

doi:10.1080/14942119.2003.10702476

Cited by 29 publications

(32 citation statements)

References 4 publications

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“…The modern CTL method usually uses two machines: a harvester and a forwarder. Combined harvester-forwarders (harwarders) that are capable of carrying out both tree processing and transportation of logs to the roadside have also recently been introduced and tested (Sirén and Aaltio 2003, Talbot et al 2003, Wester and Eliasson 2003. Compared to other fully mechanized harvesting methods, the CTL method is generally regarded as a more environmentally friendly, versatile and safe method that provides end products of more consistent and higher quality than mechanized full tree and tree length methods (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, there seem to be more research reports on an international level about forwarders' productivity from America (Tufts and Brinker 1993, Kellogg and Bettinger 1994, McNeel and Rutherford 1994, Aedo-Ortiz et al 1997, Tufts 1997 than Europe (Kuitto et al 1994, Gullberg 1997b, Brunberg 2004. However, the introduction of combined machines has also recently increased the interest in the performance of forest haulage in Europe (Sirén and Aaltio 2003, Talbot et al 2003, Wester and Eliasson 2003.…”

Section: Introductionmentioning

confidence: 99%

“…In Sweden Brunberg (2004) reported a combination of productivity data for forwarders based on several studies and productivity norms available. Talbot et al (2003) utilized a simulation technique in deriving time consumption functions for cutting and forest haulage performance. The productivity of modern single-grip harvesters has been rather intensively studied in the Nordic countries (Brunberg et al 1989, Brunberg 1991, Kuitto et al 1994, Brunberg 1997, Lageson 1997, Eliasson 1998, Sirén 1998, Glöde 1999, Hånell et al 2000, Ryynänen and Rönkkö 2001, Kärhä et al 2004, Ovaskainen et al 2004), but also to some extent in North America (Tufts and Brinker 1993, Kellogg and Bettinger 1994, McNeel and Rutherford 1994, Landford and Stokes 1995, 1996, Tufts 1997.…”

Section: Introductionmentioning

confidence: 99%

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Time consumption analysis of the mechanized cut-to-length harvesting system

Nurminen¹,

Korpunen²,

Uusitalo³

2006

Silva Fenn.

276

300

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The time consumption and productivity of harvesting are dependent on stand conditions, the operators' skills, working techniques and the characteristics of the forestry machinery. Even if the basic methods and machine types of the cut-to-length harvesting system have not changed significantly in 10 to 15 years, improvements in the operators' competence, technical solutions in forest machinery and changes in the working environment have undoubtedly taken place. In this study, the objective was to discover the special characteristics in the time consumption of mechanized cutting and forest haulage in Finnish conditions. The empirical time study was conducted with professional operators and medium-sized single-grip harvesters and forwarders in final fellings and thinnings in easy terrain in central Finland. The models for effective time consumption in the work phases and total productivity were formed. Stem size, tree species and bucking affected the cutting, whereas timber density on the strip road, the average driving distance, load capacity, wood assortment and the bunching result of the harvester operator had an effect on the forest haulage performance. The results may be used in simulations, cost calculations and education.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Time consumption analysis of the mechanized cut-to-length harvesting system

Nurminen¹,

Korpunen²,

Uusitalo³

2006

Silva Fenn.

276

300

View full text Add to dashboard Cite

show abstract

“…Several forest technology studies have noted that interactions leading to waiting and queuing result in increased costs (e.g. Asikainen 1995;Talbot et al 2003;Väätäinen et al 2005;Spinelli and Visser 2009;An and Searcy 2010;Asikainen 2010;Holzleitner et al 2013;Belbo and Talbot 2014;Eriksson 2014a;Eriksson 2014b). For example, in the cost of comminution and transportation, the bias varies between 10-20% (Asikainen 1995;Asikainen 2010), depending on the transportation distance if the interactions of comminution and transportation capacity are not considered.…”

Section: Discussionmentioning

confidence: 99%

The cost competitiveness of conifer stumps in the procurement of forest chips for fuel in Southern and Northern Finland

Laitila¹,

Ranta²,

Asikainen³

et al. 2015

Silva Fenn.

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• Pre-grinding and integrated screening is a way of guaranteeing fuel quality, but, when the stumps' ash content is six per cent or below, the procurement costs are higher than with grinding of stumps at the plant. Because of high transportation costs, stump harvesting is the most profitable in Southern Finland, where there is greater availability of stumps than in Northern Finland. AbstractThe aim of this study was to evaluate cost competitiveness, at regional level, of various systems for stump transportation and grinding, and to compare the results to the procurement costs of delimbed stems from early thinnings at the stand and regional level. The accumulation and procurement costs of stumps and delimbed stems were estimated within a 100-kilometer radius from two power plants located in Kouvola and in Kajaani. The analyses were performed as simulated treatments in clear cuts and thinnings of young stands, using existing productivity and cost functions, alternative ash percentages for stump wood, and yield calculations based on the forest industry regeneration felling stand data and the sample plots data of the National Forest Inventory of Finland. The results were expressed as Euros per solid cubic meter (€ m -3 ) and Euros per megawatt hour (€ MWh -1 ).The results highlight the need to improve stump fuel quality and increase the heating value. The procurement cost of stumps was about 1 € MWh -1 lower in Kouvola compared to Kajaani, when using conceivable ash content of 6% for stumps ground at the plant, and ash content of 1.5% for stumps pre-ground at the roadside landing. The procurement costs of stumps were, on average, 0.55 € MWh -1 lower compared to delimbed stems in Kouvola, and on average 0.6 € MWh -1 higher in Kajaani. Pre-grinding and integrated screening is a feasible way to guarantee the fuel quality expressed as ash content already at roadside landings, but the procurement costs are higher compared to grinding stumps at the plant, when the ash content of ground stumps is 6% or less.

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“…AedoOrtiz et al 1997;Eliasson 1999;Newnham 1966;Ringdahl et al 2012;Sängstuvall et al 2012;Talbot et al 2003;Wang et al 2005). Simulation is a flexible tool for evaluating or comparing forest machines that are not presently available for practical testing.…”

Section: Literature Reviewmentioning

confidence: 99%

Application of a primarily deductive framework describing time consumption for hauling of logs to road-side

Sängstuvall¹,

Lämås²,

Nordfjell³

2012

Ann Oper Res

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Forest management planning decisions are often based on the forest owner's goals, which typically focus on economic criteria. Logging operation work productivity functions are used when costing forest operations. These functions affect the conclusions drawn during forest management analyses because different logging environments give rise to different harvesting costs. When evaluating new combinations of machines and environments, there is generally a shortage of field data on productivity that can be examined in advance. We applied a previously published deductive framework describing time consumption in forwarding to known environments, in which field studies on forwarding have been conducted and for which extensive data are available. We then adapted the deductive framework to better reproduce the results obtained in the time studies. The deductive framework accurately reproduced the observed forwarding productivities; on average, the adaptation process improved the accuracy of this reproduction. However, it may also have reduced the accuracy of individual predictions. We conclude that the deductive framework can be used as a basis for constructing work productivity functions for forest management analyses, and can serve as a foundation when constructing new productivity functions based on time study results to use when pricing forwarding.

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Assessing the Utility of Two Integrated Harvester-Forwarder Machine Concepts Through Stand-Level Simulation

Cited by 29 publications

References 4 publications

Time consumption analysis of the mechanized cut-to-length harvesting system

Time consumption analysis of the mechanized cut-to-length harvesting system

The cost competitiveness of conifer stumps in the procurement of forest chips for fuel in Southern and Northern Finland

Application of a primarily deductive framework describing time consumption for hauling of logs to road-side

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