Characteristics and Significance of a Harvester Operators’ Working Technique in Thinnings

  title={Characteristics and Significance of a Harvester Operators’ Working Technique in Thinnings},
  author={Heikki Ovaskainen and Jori Uusitalo and Kari V{\"a}{\"a}t{\"a}inen},
  journal={International Journal of Forest Engineering},
  pages={67 - 77}
Abstract Productivity levels between harvester operators have been noted to vary significantly, by up to 40% in similar stands. It is believed that differences originate from the operators cutting techniques, motoric skills, planning of work, experience, felling order of removable trees, decision processes at the working location, machine properties and the surrounding environment. The objective of this study is to examine and compare six harvester operators and to detect those features of… Expand
Mechanized tree planting with an excavator-mounted M-Planter planting device
The efficiency of modern tree planting machines is strongly affected by operational conditions, technical machine performance, and operator. In this study, the aim was to determine the timeExpand
Time consumption analysis of the mechanized cut-to-length harvesting system
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. Expand
Performance Analysis of a Harvester during Timber Extraction Activities in Bursa, Turkey
In Turkey, the use of mechanized harvesting technology in forestry has recently increased due to demands of private forest industry for large amounts of woods . In order to implement these systemsExpand
Productivity standards for whole-tree and cut-to-length harvesting systems in Maine
Due to the increased partial harvest of small diameter stems and the lack of feller-buncher time consumption information in Maine, it was necessary to develop new cycle time equations. Data wereExpand
The accuracy of measurements in a time study of harvester operations
BackgroundWork time measurements are the starting point for any calculation of unit costs of machine exploitation; therefore, the accuracy of evaluating these costs determines the economicExpand
A log-by-log productivity analysis of two Valmet 475EX harvesters
Productivity of a mechanized harvesting system is influenced by stand and terrain conditions, operator performance, and machinery limitations or design. The purpose of the study was to compare theExpand
Productivity Analysis of Timber Skidding Operation with Farm Tractor
Farm tractors equipped with necessary attachments have been widely used in skidding of forest products in Turkey. There are number of different types and sizes of farm tractors that are employed inExpand
Productivity of the M-Planter Tree- Planting Device in Practice
Need to mechanise tree-planting work have recently increased for many reasons. The newest planting and soil scarification device performing work in Nordic forests is the Finnish M-Planter. This studyExpand
Finding the ‘Sweet-Spot’ of Mechanised Felling Machines
Understanding how stand and terrain parameters impact the productivity of harvesting machines is important for determining their optimum use. Productivity studies in forest operations are oftenExpand
Effect of multi-tree handling and tree-size on harvester performance in small-diameter hardwood thinnings
Early thinnings are laborious and costly. Thus forest companies are searching for cost and time efficient ways to carry out this task. The study’s purpose was to determine the productivity of theExpand


Thinning Productivity and Cost for a Mechanized Cut-to-Length System in the Northwest Pacific Coast Region of the USA
A production study of a single-grip harvester and forwarder was conducted in a second-growth thinning operation in western Oregon, USA. Production levels for the harvester exceeded 30 m3/ PMHExpand
Comparison of two thinning systems. Part 2. Productivity and costs
A side-by-side comparison of two popular thinning systems, a skidder system and a forwarder system, was made during winter logging conditions in southern Alabama. The first report of this studyExpand
Productivity of a Scandinavian cut-to-length system while second thinning pine plantations
Cut-to-length timber harvesting systems have been used in the Scandinavian countries for many years. Only two machines, a harvester and forwarder, are needed to produce timber products on board aExpand
Productivity and cost of the ponsse 15-series, cust-to-length harvesting systems in southern pine plantations
Machine productivity data were collected for a Ponsse HS-15 harvester and S-15 forwarder from study sites in central Alabama during a second thinning. Tree size, in terms of diameter at breast heightExpand
Modelling Harvester-Forwarder System Performance in a Selection Harvest
Abstract A harvester – forwarder system was studied in a selection harvest operation conducted in an interior forest stand composed of Douglas fir (Pseudotsuga menziesii), Ponderosa pine (PinusExpand
Comparison of two thinning systems. Part 1. Stand and site impacts
During the winter of 1991, a side-by-side comparison was made between two popular thinning systems: a feller-buncher, grapple skidder, loader/slasher system and a harvester, forwarder system. A firstExpand
Simulating a harvester-forwarder softwood thinning : A software evaluation
A discrete-event simulation model of a mechanized forest harvest system was evaluated with special attention given to the effectiveness of using statistical distributions derived from field-studyExpand
Principle of comparative time studies in mechanized forest work
The principle of comparative work studies was tested in grapple loading by a forest machine simulator. The comparison was between loading in clear‐cutting and thinning conditions. The principleExpand
Operation of the Single-Grip Harvester: Motor-Sensory and Cognitive Work
Abstract This article describes the interface between a one-grip harvester and its operator as it relates to motor-sensory and cognitive activities of the operator when carrying out thinning andExpand
Evaluating Operator-Machine Interactions in Comparative Time Studies
Comparative experimental studies offer possibilities for reducing the uncontrolled variation in time studies of forest work. However, the factor "Operator" has often been found to be very difficultExpand