Search for dissertations about: "FORESTRY"

Showing result 1 - 5 of 689 swedish dissertations containing the word FORESTRY.

  1. 1. Automation in forestry development of unmanned forwarders

    University dissertation from Umeå : Institutionen för datavetenskap, Umeå Universitet

    Author : Ola Ringdahl; Umeå universitet.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TECHNOLOGY Information technology Computer science; TEKNIKVETENSKAP Informationsteknik Datavetenskap; FORESTRY; AGRICULTURAL SCIENCES and LANDSCAPE PLANNING Area technology Forest engineering; SKOGS- och JORDBRUKSVETENSKAP samt LANDSKAPSPLANERING Areell teknik Skogsteknik; data- och systemvetenskap; Computer and Information Science;

    Abstract : For the last 50 year, forestry operations have become more and more mechanized. In modern forestry in Europe two machines are typically used; a harvester that fells, debranches and cross-cuts the trees into logs and a forwarder that transports them to the nearest road. READ MORE

  2. 2. Ash Products for Nutrient Recycling in Forestry : Leaching and Drying Characteristics

    University dissertation from Umeå : Institutionen för datavetenskap, Umeå Universitet

    Author : Peter Mellbo; Högskolan i Kalmar.; [2007]
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Ash products; Wood ash; Leaching; Drying; Nutrient; ; Sustainable forestry; FORESTRY; AGRICULTURAL SCIENCES and LANDSCAPE PLANNING Plant production Forestry; SKOGS- och JORDBRUKSVETENSKAP samt LANDSKAPSPLANERING Växtproduktion Skogsskötsel; Miljövetenskap; Environmental Science;

    Abstract : As the demand for carbon dioxide neutral energy sources increases, forestry becomes more intensive. Entire trees are removed from the felling sites threatening the nutrient balance of the forest soils. READ MORE

  3. 3. Towards semi-automation of forestry cranes automated trajectory planning and active vibration damping

    University dissertation from Umeå : Umeå universitet

    Author : Szabolcs Fodor; Umeå universitet.; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forestry; forwarder cranes; semi-automation; slewing actuator; automated trajectory planning; oscillations; inner boom actuator; active vibration damping; frequency estimation; input shaping control technique; H2-optimal control;

    Abstract : Forests represent one of the biggest terrestrial ecosystems of Earth, that can produce important raw renewable materials such as wood with the help of sun, air and water. To efficiently extract these raw materials, the tree harvesting process is highly mechanized in developed countries, meaning that advanced forestry machines are continuously used to fell, to process and to transport the logs and biomass obtained from the forests. READ MORE

  4. 4. Forestry machine and soil interaction for sustainable forestry

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Abdurasul Pirnazarov; KTH.; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CTL-logging; forestry machine; forwarder; multi-body simulations; roots; terramechanics; wheel-soil interaction; WES model; Machine Design; Maskinkonstruktion;

    Abstract : More than 50 percent of the land area of the Nordic countries Finland, Norway, and Sweden are covered by dense forests and they are among the most important producers of forest products in the world. Forestry in these countries is based on sustainable management principles – reforestation follows harvesting. READ MORE

  5. 5. Semi-Automating Forestry Machines Motion Planning, System Integration, and Human-Machine Interaction

    University dissertation from Umeå : Umeå Universitet

    Author : Simon Westerberg; Umeå universitet.; [2014]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Forestry Robotics; Forest Machine Automation; Trajectory Planning; Hydraulic Manipulators; Teleoperation; Virtual Environments; Interaction Methods; Head Tracking;

    Abstract : The process of forest harvesting is highly mechanized in most industrialized countries, with felling and processing of trees performed by technologically advanced forestry machines. However, the maneuvering of the vehicles through the forest as well as the control of the on-board hydraulic boom crane is currently performed through continuous manual operation. READ MORE