The Experts below are selected from a list of 111 Experts worldwide ranked by ideXlab platform
Bruce R. Hartsough - One of the best experts on this subject based on the ideXlab platform.
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Productivity and Cost of Mechanized Whole-Tree Harvesting of Fast-Growing Eucalypt Stands
International Journal of Forest Engineering, 2002Co-Authors: Raffaele Spinelli, Bruce R. Hartsough, Philip Owende, Shane WardAbstract:Abstract The performance of alternative equipment for the whole-tree harvesting of eucalypt stands was evaluated, using data from five different commercial operations. The study covered three machines for felling and bunching, two for extraction (skidding), and two for combined delimbing, debarking and chipping. Productivity and operating cost models were evaluated for each of the machines, in order to estimate the net harvesting costs under varying forest stand and site conditions. It was found that under easy terrain conditions (flat terrain, dry ground), trees should be felled by threewheeled feller-bunchers and extracted by Front-End Loaders, as this combination had the lowest harvesting costs. Due to mobility limitations, this equipment may have to be replaced by tracked feller-bunchers and conventional skidders in steep terrain and/or soft ground. It was estimated that the cost of using the wheeled feller-buncher and the Front-End loader system ranged between 16–22$ per oven-dry-ton (odt), depending...
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Extracting whole short rotation trees with a skidder and a Front-End loader
Biomass and Bioenergy, 2001Co-Authors: R. Spinelli, Bruce R. HartsoughAbstract:Abstract We time-studied a Caterpillar 950F Front-End loader and a Caterpillar 528 grapple skidder used to extract bunched whole trees to a landing in a short rotation Eucalyptus plantation. The loader was 40–60% more productive than the grapple skidder, depending on extraction distance. Alternatively, the single loader could both extract trees and handle the landing duties, such as moving residues from the flail-chipper, whereas the skidder required a second machine (skidder or small loader) to handle landing activities. Front-End Loaders appear to be very promising as extraction devices for short rotation plantations where tree characteristics, terrain and soil conditions allow them to be used.
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Comparison of a Skidder and Front-End Loader for Primary Transport of Short-Rotation Trees
1999Co-Authors: Raffaele Spinelli, Bruce R. HartsoughAbstract:We time-studied a Cat 950F and a Cat 528 grapple skidder as extraction devices for moving bunched whole trees to a landing in a short rotation eucalyptus plantation. The Front-End loader was 40 to 60% more productive than the grapple skidder, depending on extraction distance. Alternatively, the single loader could both extract trees and handle the landing duties such as moving residues whereas the skidder required a second machine (skidder or small loader) to handle landing activities. Front-End Loaders appear to be very promising as extraction devices for short rotation plantations where tree characteristics, terrain and soil conditions allow them to be used.
Leonid B. Freidovich - One of the best experts on this subject based on the ideXlab platform.
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Robust position control design for a cylinder in mobile hydraulics applications
Control Engineering Practice, 2017Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Automation of various agricultural tasks, which are nowadays routinely executed by operators of hydraulically actuated tractors equipped with Front-End Loaders, is an important open problem. The so ...
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Control and Tuning Procedure of a Cylinder in Mobile Hydraulics
2017Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Automation of various agricultural tasks, which are routinely executed nowadays by operators of hydraulically actuated tractors equipped with Front-End Loaders, is an important open problem. The so ...
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Improvement of Model-Based Payload Estimation for Agricutural Front-End Loaders
2017Co-Authors: I Yung, Leonid B. Freidovich, Carlos VazquezAbstract:We consider here the development of a better payload estimation system for an agricultural Front-End Loader, equipped with position and pressure sensors, that enable monitoring of various routine o ...
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Payload Estimation in Front-End Loaders
2016Co-Authors: I Yung, Leonid B. Freidovich, Carlos VazquezAbstract:A methodology based on an equation of motion and a two-steps off-line optimization procedure is proposed and investigated to estimate a payload in an industry-standard Front-End Loader. The locatio ...
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ETFA - Automation of front end Loaders: Self leveling task
2015 IEEE 20th Conference on Emerging Technologies & Factory Automation (ETFA), 2015Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Due to some limitations of mechanical solution for automation of front end Loaders, specifically self-leveling task, we investigate here the sensor-based solution. We present a model of front end Loaders and the comparison of different controllers to realize this task. The best performance is observed from the controller comprising linear terms, compensation of input nonlinearity known as dead zone, and compensation of disturbances constructed from its estimation.
I Yung - One of the best experts on this subject based on the ideXlab platform.
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Robust position control design for a cylinder in mobile hydraulics applications
Control Engineering Practice, 2017Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Automation of various agricultural tasks, which are nowadays routinely executed by operators of hydraulically actuated tractors equipped with Front-End Loaders, is an important open problem. The so ...
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Control and Tuning Procedure of a Cylinder in Mobile Hydraulics
2017Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Automation of various agricultural tasks, which are routinely executed nowadays by operators of hydraulically actuated tractors equipped with Front-End Loaders, is an important open problem. The so ...
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Improvement of Model-Based Payload Estimation for Agricutural Front-End Loaders
2017Co-Authors: I Yung, Leonid B. Freidovich, Carlos VazquezAbstract:We consider here the development of a better payload estimation system for an agricultural Front-End Loader, equipped with position and pressure sensors, that enable monitoring of various routine o ...
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Automation of Front-End Loaders : electronic self leveling and payload estimation
2017Co-Authors: I YungAbstract:A growing population is driving automatization in agricultural industry to strive for more productive arable land. Being part of this process, this work is aimed to investigate the possibility to i ...
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Payload Estimation in Front-End Loaders
2016Co-Authors: I Yung, Leonid B. Freidovich, Carlos VazquezAbstract:A methodology based on an equation of motion and a two-steps off-line optimization procedure is proposed and investigated to estimate a payload in an industry-standard Front-End Loader. The locatio ...
Carlos Vazquez - One of the best experts on this subject based on the ideXlab platform.
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Robust position control design for a cylinder in mobile hydraulics applications
Control Engineering Practice, 2017Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Automation of various agricultural tasks, which are nowadays routinely executed by operators of hydraulically actuated tractors equipped with Front-End Loaders, is an important open problem. The so ...
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Control and Tuning Procedure of a Cylinder in Mobile Hydraulics
2017Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Automation of various agricultural tasks, which are routinely executed nowadays by operators of hydraulically actuated tractors equipped with Front-End Loaders, is an important open problem. The so ...
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Improvement of Model-Based Payload Estimation for Agricutural Front-End Loaders
2017Co-Authors: I Yung, Leonid B. Freidovich, Carlos VazquezAbstract:We consider here the development of a better payload estimation system for an agricultural Front-End Loader, equipped with position and pressure sensors, that enable monitoring of various routine o ...
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Payload Estimation in Front-End Loaders
2016Co-Authors: I Yung, Leonid B. Freidovich, Carlos VazquezAbstract:A methodology based on an equation of motion and a two-steps off-line optimization procedure is proposed and investigated to estimate a payload in an industry-standard Front-End Loader. The locatio ...
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ETFA - Automation of front end Loaders: Self leveling task
2015 IEEE 20th Conference on Emerging Technologies & Factory Automation (ETFA), 2015Co-Authors: I Yung, Carlos Vazquez, Leonid B. FreidovichAbstract:Due to some limitations of mechanical solution for automation of front end Loaders, specifically self-leveling task, we investigate here the sensor-based solution. We present a model of front end Loaders and the comparison of different controllers to realize this task. The best performance is observed from the controller comprising linear terms, compensation of input nonlinearity known as dead zone, and compensation of disturbances constructed from its estimation.
R. Spinelli - One of the best experts on this subject based on the ideXlab platform.
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Extracting whole short rotation trees with a skidder and a Front-End loader
Biomass and Bioenergy, 2001Co-Authors: R. Spinelli, Bruce R. HartsoughAbstract:Abstract We time-studied a Caterpillar 950F Front-End loader and a Caterpillar 528 grapple skidder used to extract bunched whole trees to a landing in a short rotation Eucalyptus plantation. The loader was 40–60% more productive than the grapple skidder, depending on extraction distance. Alternatively, the single loader could both extract trees and handle the landing duties, such as moving residues from the flail-chipper, whereas the skidder required a second machine (skidder or small loader) to handle landing activities. Front-End Loaders appear to be very promising as extraction devices for short rotation plantations where tree characteristics, terrain and soil conditions allow them to be used.
