Author: Forest Management Institute (Canada)Publisher:
ISBN:
Category :
Languages : en
Pages : 184
Book Description
Analysis of Tree Harvesting Machines and Systems
Author: Forest Management Institute (Canada)Publisher:
ISBN:
Category :
Languages : en
Pages : 184
Book Description
Analysis of Tree Harvesting Machines and Systems: a Methodology
Author: W. E. McCrawPublisher:
ISBN:
Category : Logging
Languages : en
Pages : 210
Book Description
A Survey of Timber Harvesting Simulation Models for Use in the South
Author: Daniel V. GouletPublisher:
ISBN:
Category : Logging
Languages : en
Pages : 20
Book Description
A Simulation Approach to the Analysis of Harvesting Machines and Systems
Author: Proceedings, Harvesting Machines and Systems Evaluation Workshop
Author: William B. StuartPublisher:
ISBN:
Category : Forest machinery
Languages : en
Pages : 234
Book Description
Determining Fixed and Operating Costs of Logging Equipment
Author: Edwin S. MiyataPublisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 20
Book Description
Technical Note
Author: Enhancing Mechanical Fruit Harvesting Machines Based on Vibration Analysis
Author: Taymaz HomayouniPublisher:
ISBN:
Category :
Languages : en
Pages : 186
Book Description
Currently, fruit removal using multi-directional canopy and trunk shakers are the most widely used technique for harvesting nut trees. To develop an intelligent harvesting machine, a system needs to be developed to shake each tree optimally. Optimum mechanical harvesting machines aim to maximize fruit removal with minimum tree and fruit damage, using the least amount of energy. Maximum fruit removal requires the tree to be shaken around its natural frequency; however, the best shaking frequency is not the same for all trees. The natural frequency of a tree is a function of its morphology, size, mass, branch configurations, wood properties, and density of leaves. The natural frequency could also change during harvest. For instance, when a tree is shaken and fruit drops, the natural frequency shifts due to changes in the mass. In this work, vibration transmission in trees is studied to enhance mechanical harvesting machines while minimizing damage to the tree. Trunk shakers and canopy shakers are the most common commercial mass harvesting machines, each comes with a limitation. Further, a trunk shaker has more energy loss from tree trunk to its canopy compared to a canopy shaker. The efficiency of the commercial harvesting machines is evaluated by quantifying the energy input to the trunk and the transferred kinetic energy throughout the tree canopy. A set of wireless accelerometer sensor systems was developed and used to measure acceleration at different parts of the tree and the shaker machines. A mathematical model of vibration and force transmission throughout a pistachio tree is developed under different shaking conditions using a trunk shaker. A new method was developed to find proper shaking intensity as a function of the tree trunk size. Two canopy shakers were designed, fabricated and tested in the field for harvesting table olive trees. One design included an adjustable head, and one included a large canopy shaker for larger mature trees. It was found that a combination of canopy and trunk shaker results in the highest harvesting efficiency in olive trees. Chapter one is mainly a review of literature of different types of mechanical harvesting methods. Chapters two and three are focused on mathematical modeling of variation and force throughout a pistachio tree while shaking using a trunk shaker. Chapters four and six presents two new canopy shakers specifically designed for table olive harvesting. The effectiveness of using two shaker machines at the same time is discussed and evaluated in Chapter five.
Tree Harvesting Techniques
Author: A. StaafPublisher: Springer Science & Business Media
ISBN: 9401735921
Category : Technology & Engineering
Languages : en
Pages : 368
Book Description
The introduction of chain saws and tractors in the early 1950's marked the beginning of a change in tree harvesting techniques from the old manual methods to mechanized operations. It was followed by a rapid evolution both technically and systematically. Hence, the requirements for improved know ledge of operational efficiency also increased. Changing relations between Man, machines and environment brought about new experiences and awareness of a physiological and ergonomic nature. Improved knowledge of both machine technology and planning of work on a small or large scale has grown increa singly important for an efficient utilization of expensive machines and other equipment. The need for a textbook on tree harvesting techniques including expe riences made in recent years is enhanced. The book presented here is prima rily based on lectures given on the subject of Forest Techniques at the Faculty of Forestry at the Swedish University of Agricultural Sciences and after modifications also at the University of Nairobi (Kenya). Thus, the book is written primarily for students at the faculties and institutes of forestry. However, it is also useful for persons actively occupied in forest operations. The presentation of this book in its original Swedish version in 1972 created a considerable interest in the preparation of a condensed edition in English. Thus interest has been expressed in Finland, Norway, Holland, Canada, U.S.A., Brazil, Japan, Poland, Scotland and Yugoslavia.
Effect of Mechanized Tree Harvesting on Jack Pine Regeneration Requirements
Author: Zigmond A. ZasadaPublisher:
ISBN:
Category : Forest regeneration
Languages : en
Pages : 20
Book Description