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Analysis Of Intermediate Support Cable Logging Systems
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Book Synopsis Analysis of Intermediate Support Cable Logging Systems by : James W. Charland
Download or read book Analysis of Intermediate Support Cable Logging Systems written by James W. Charland and published by . This book was released on 1997 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: The forest products industry often uses intermediate-support cable logging systems to transport logs from the harvest site to a staging area. A method is presented to assist in the analysis and design of these cable systems. The method determines tensions in individual cables, forces on and stresses in the support trees, and the geometry of the system under load. Static equilibrium and cable length compatibility are used to generate a system of simultaneous equations. This system of coupled, non-linear algebraic equations is solved numerically using the Newton-Raphson algorithm. A good, automated initial guess for the unknown quantities, based on the physics of the problem, is provided. A model of an example intermediate support cable logging system is analyzed by the proposed approach and the resulting behavior discussed. The method includes the effects of catenary sag and elastic stretch in the cables, and elastic behavior in the support trees. Friction is ignored in the formulation. The catenary and elastic stretch methodologies for the cables are each demonstrated on a single cable span as well as on a demonstration cable system. The effect of the support tree flexibility and cable mass are found to be significant on the response of the cable logging system. The effects of elastic stretch in the cables is not found to be significant for the cable logging systems considered.
Book Synopsis Development of a Cable Logging System Analysis Package for Micro-computers by : Joosang Chung
Download or read book Development of a Cable Logging System Analysis Package for Micro-computers written by Joosang Chung and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer program package to estimate cable yarding payload capability was made. The package was intended to expand applicability of existing packages and to be user friendly. It has six system options: live skyline, standing skyline, running skyline, slackline, multispan and highlead. In the standing skyline and multispan analyses, load path analysis, as well as payload anaiysis, is available as an optional basis. Each program for the analysis of a system was built to include subroutines to consider its mechanical characteristics, which are usually ignored in existing packages. The running skyline program has an option to consider the maximum torque on the haulback drum. The highlead analysis program has an option to consider the effect of cable drag. The inultispan has a subroutine to check carriage passage over a support jack and an option to consider the effect of jack friction. In addition, the effect of log drag and log shape as well as choking strategy can be considered as an optional basis. The paper was written to present the mathematical formulations and modeling procedures used in building the package. In addition, outputs of an example run for each system are presented with interpretations.
Book Synopsis Glossary of Cable Logging Terms by : United States. Forest Service
Download or read book Glossary of Cable Logging Terms written by United States. Forest Service and published by . This book was released on 1969 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the International Mountain Logging and 10th Pacific Northwest Skyline Symposium by : John Sessions
Download or read book Proceedings of the International Mountain Logging and 10th Pacific Northwest Skyline Symposium written by John Sessions and published by . This book was released on 1999 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Pacific Northwest Forest and Range Experiment Station (Portland, Or.) Publisher : ISBN 13 : Total Pages :12 pages Book Rating :4.:/5 (319 download)
Book Synopsis Glossary of Cable Logging Terms by : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Download or read book Glossary of Cable Logging Terms written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1969 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cable Logging Systems by : Roy S. Larsen
Download or read book Cable Logging Systems written by Roy S. Larsen and published by Bernan Press(PA). This book was released on 1981 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analysis of Road Changing on Several Cable Logging Operations by : Denis James Van Winkle
Download or read book An Analysis of Road Changing on Several Cable Logging Operations written by Denis James Van Winkle and published by . This book was released on 1977 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Road changing i.s the activity of moving operating lines on a cable yarding operation to permit access to logs in an unyarded portion of a logging unit. The time required to perform this activity varies widely and may consume a significant portion of the total yarding time. With rising costs in the logging industry, the efficiency of cable logging systems is constantly under critical review. Additional research in the area of road changing has been suggested in several studies (Dykstra, 1974 and Peters, 1973) Road changing information was gathered on several yarding operations in conjunction with detailed production studies of cable logging systems. On six of the operations the total time consumed by road changing was noted and recorded as a delay in the yarding process. On four operations, road changing was segmented into various activities, and factors hypothesized to influence road changing time were identified and measured. On the four operations studied in detail, two crewmen timed the road changing operation as the activities involved occurred at widely separated locations on the logging unit. The continuous time study method used on the overall production study (Dykstra, 1975a) was also used during road changing. The analysis of road changing involves a descriptive analysis of all the operations studied and a quantitative analysis of road changing on the four operations studied in detail. The descriptive analysis consists primarily of a comparative investigation of road changing time between the operations. The quantitative analysis consists of a regression analysis of the four operations examined in detail. In the comparison of road changing times for the ten operations observed, road changing time varied widely. Even among similar systems a wide range was observed. This variability was most likely due to the differences in the road changing methods themselves, varying characteristics of the logging units and lengthy delays encountered during road changing. This could not be confirmed for six of the operations as road changing was not recorded in detail. However, among those operations observed in detail, this influence could be seen. Following a breakdown of road changing into machine intensive activities, labor intensive activities and delays, a large percentage of road changing time is occupied by delays. Also, the greatest proportion of delay-free time involved labor intensive activities. This was expected on the operations where pre-layout of roads was not done. On the operation where roads were pre-layed, other activities requiring labor intensive action occurred. Some of the delays encountered may have been due to characteristics of the particular yarder being used. A quantitative analysis was made of four operations. Road changing time, excluding delays and the time required to relocate the yarder was used as the dependent variable. Delay-free road changing time was found to be a function of the distance from the landing to the tailhold (SPAN) and groundslope. For two of the operations, identical machines and methods were used. A combined regression equation was formed based on the independent variable SPAN. Also, based on the scatter of observations for these systems, an equa.- tion using SPAN2 as the independent variable was found to be a better predictor of delay-free road changing time than SPAN.
Book Synopsis Predicting the Payload Capability of Cable Logging Systems Including the Effect of Partial Suspension by : Gary D. Falk
Download or read book Predicting the Payload Capability of Cable Logging Systems Including the Effect of Partial Suspension written by Gary D. Falk and published by . This book was released on 1981 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cable Logging Systems by : Donald D. Studier
Download or read book Cable Logging Systems written by Donald D. Studier and published by . This book was released on 1976 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Initial Analysis to Determine the Most Feasible Cable Logging System for Korea by : Han-sup Han
Download or read book An Initial Analysis to Determine the Most Feasible Cable Logging System for Korea written by Han-sup Han and published by . This book was released on 1994 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technoeconomic Analysis of Conventional Logging Systems Operating from Stump to Landing by : Raymond L. Sarles
Download or read book Technoeconomic Analysis of Conventional Logging Systems Operating from Stump to Landing written by Raymond L. Sarles and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: S2A technoeconomic analysis of timber harvesting systems was conducted to obtain key information for estimating long run supply trends of roundwood materials from eastern woodlands. Productivity and cost factors for six stump-to-landing systems were developed from operational data for 47 harvesting operations. Technical factors and the effects of financial considerations were also assessed. Combined with the productivity and cost factors, they provided better perception of the forces impacting long run roundwood supplies and logging contractors' business options.S3.
Book Synopsis Analysis of the Tension in the Guylines for Cable Logging Support Trees by : Isao Obara
Download or read book Analysis of the Tension in the Guylines for Cable Logging Support Trees written by Isao Obara and published by . This book was released on 1982 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tepee Butte Recovery Project written by and published by . This book was released on 1989 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a Cable Logging System Analysis Package for Micro-computers by : Joosang Chung
Download or read book Development of a Cable Logging System Analysis Package for Micro-computers written by Joosang Chung and published by . This book was released on 1987 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer program package to estimate cable yarding payload capability was made. The package was intended to expand applicability of existing packages and to be user friendly. It has six system options: live skyline, standing skyline, running skyline, slackline, multispan and highlead. In the standing skyline and multispan analyses, load path analysis, as well as payload anaiysis, is available as an optional basis. Each program for the analysis of a system was built to include subroutines to consider its mechanical characteristics, which are usually ignored in existing packages. The running skyline program has an option to consider the maximum torque on the haulback drum. The highlead analysis program has an option to consider the effect of cable drag. The inultispan has a subroutine to check carriage passage over a support jack and an option to consider the effect of jack friction. In addition, the effect of log drag and log shape as well as choking strategy can be considered as an optional basis. The paper was written to present the mathematical formulations and modeling procedures used in building the package. In addition, outputs of an example run for each system are presented with interpretations.
Book Synopsis Production and Cost Analysis of a Skyline Cable Logging System Operating in an Uneven-age Management Prescription by : Steven Alarid
Download or read book Production and Cost Analysis of a Skyline Cable Logging System Operating in an Uneven-age Management Prescription written by Steven Alarid and published by . This book was released on 1993 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some environmental effects of cable logging in Appalachian forests by : James H. Patric
Download or read book Some environmental effects of cable logging in Appalachian forests written by James H. Patric and published by . This book was released on 1980 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of Cable Yarding Conference by : John G. Paul
Download or read book Proceedings of Cable Yarding Conference written by John G. Paul and published by . This book was released on 1980 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
