عوامل موثر بربازده عملیات بهره برداری و افزایش بازده حمل ونقل چوب را در این صفحه بیان میکند .
What Affects Skidder Productivity
Study DescriptionSkidding seems to be the process most influenced
by external or operational conditions.
Other studies are examining how skidders are affected by site
characteristics. The purpose of this study is to define how operational characteristics
affect skidder, and overall system, efficiency. Skidders typically work in groups to supply
trees to loaders and/or delimbers at fixed decks. Skidders can create congestion at decks
when the amount of wood being delivered during any time period exceeds the capacity of
the loader to store or handle it. Skidder operators choose their arrival times at the deck by
picking a bundle to haul: the distance of the bundle from the deck determines, with some
random variation, when the skidder will reach the deck. This study will determine how
the pattern of choices of bundle distance can influence skidding productivity under
various conditions, and define methods to alter haul patterns when conditions change.
Status:A simulation model of skidder operations has been developed. Initial results
comparing effects of haul distance distribution and skidder bundle choice decision
algorithms have been completed. Further simulation work is being done, and field work
is being started to document haul distance patterns used by operators.
•Higher utilization of skidding and loader capacity
•Recommendations for how to increase productivity of logging operations for
varying timber/site conditions
Cooperators:Biosystems and Industrial Engineering, Auburn University
Issue:Tree-length timber harvesting
produces timber through a series of steps
performed using purpose-built machines.
Each step must be balanced with those
preceding or following it along the chain in
order to maximize overall system efficiency.
Changing site or weather conditions can
influence the efficiency of any (or all) steps,
but not always by the same amount, leading
to imbalances and lost productivity in the
Increasing Efficiency of Log Transport
Issue:Transport of raw material from
woods to consumption point contributes
about 15 percent to the overall cost of wood
fiber, a proportion that will rise along with
fuel prices unless steps are taken to increase
efficiency of the transport system.
Study Description:Loggers can
theoretically increase their gross income by
hauling more wood to consuming mills in a
given period of time. It is important
therefore, to ensure that trucking capacity stays balanced with a logger’s ability to cut and
load timber in the woods. This is not a trivial problem, however, as the haul distance to
consuming mills can vary a great deal over short periods of time. The logger providing
his own transport must employ the number of trucks that minimizes transport costs when
working close to the mill, and moves enough wood when operating far from the mill to
maintain profitability. A more efficient approach to the transport problem would be to
pool a fixed number of trucks among many loggers so that, at any one time, all are served
optimally regardless of where they are working. Implementing a pooled truck resource
system requires that a) the overall scheme maximizes wood flow, and b) all loggers are
served equally. This project is intended to evaluate options regarding wood transport
system effectiveness as influenced by structural changes, mainly use of intermediate yard
facilities to minimize the impact of woodyards on haul turn times, and the effectiveness
of various methods of dispatching trucks given knowledge of the state of the procurement
Status:A simulation model of woods-to-mill transport has been developed. Initial
results comparing dispatch and transport system structure effects are being published, and
further work on verifying the simulation model with field data is planned.
Lowered wood fiber costs
Higher utilization of trucking capacity
Reliable dispatch methods for shared transport service providers
Cooperators:Industrial and Systems Engineering Department, Auburn University .