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Czasopisma help

  1. 10 Sylwan

  2. 4 Acta Agraria et Silvestria. Series Silvestris

  3. 4 Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

  4. 3 Forestry Letters

  5. 3 Nauka Przyroda Technologie. Uniwersytet Przyrodniczy w Poznaniu

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Autorzy help

  1. 39 Szewczyk G.

  2. 17 Kulak D.

  3. 17 Stanczykiewicz A.

  4. 13 Sowa J. M.

  5. 6 Leszczynski K.

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  1. 1 2023

  2. 1 2021

  3. 4 2020

  4. 1 2019

  5. 1 2016

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1

Mozliwosci wykorzystania wskaznikow intensywnosci trzebiezy w kategoryzacji warunkow pracy dla wybranych technologii pozyskiwania drewna na reczno-maszynowym poziomie zmechanizowania

100%
Szewczyk G.
Acta Agraria et Silvestria. Series Silvestris
|
2009
|
tom 47
27-45
The purpose of this study was to determine models of labor consumption characteristics at the work station of a power chain saw operator in the following timber harvesting technologies: with horse skidding, using the Multi FKS winch, and using the NIAB 5-15 processor. The mean level of labor consumption was 22.66 min/m3. Six equations of a multiple regression were approximated. The coefficient of determination varied from 0.4 to 0.6, and this indicated a good fitting. The factors affecting the labor consumption level were as follows: characteristics of the harvested timber, thinning intensity indexes, and elements of the workday structure. The variation of thinning intensity indexes, determined on the basis of tabular data, was used to determine intervals of timber harvesting labor consumption according to stand age classes (degrees of difficulty) 30 and 40 years.
2

Sekwencyjność operacji zrywki w drzewostanach trzebieżowych i poklęskowych

100%
Szewczyk G.
Nauka Przyroda Technologie. Uniwersytet Przyrodniczy w Poznaniu
|
2012
|
tom 06
|
nr 3
Celem badań było określenie charakterystyki średniego, powtarzalnego fragmentu zmiany roboczej operacji zrywkowych. Badania przeprowadzono w trzebieżowych i poklęskowych drzewostanach sosnowych. Właściwą dla analizowanego stanowiska kolejność wykonywania czynności opisano jako szereg czasowy. Trend analizowanych szeregów czasowych został opisany po ich wygładzeniu metodą średniej ruchomej, natomiast wahania zidentyfikowano metodą dekompozycji sezonowej. Zróżnicowanie struktury czasowej pracy w analizowanych drzewostanach zostało opisane wielomianami drugiego i trzeciego stopnia. W drzewostanach trzebieży późnych trend i cykliczność prac w okresie 20 kolejnych czynności pozwoliły ustalić wielkość próby na poziomie 40 czynności, po 20 w dwóch fazach dnia roboczego. W drzewostanach ze śniegołomami wystarczający był pomiar czasu trwania 60 kolejnych czynności, po 20 w kolejnych trzech fazach dnia roboczego wskazanych przez linię trendu.
3
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Czasochłonność zrywki konnej w drzewostanach trzebieżowych

100%
Szewczyk G.
Sylwan
|
2010
|
tom 154
|
nr 01
52-63
4
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Obserwacje migawkowe w pomiarach pracy przy pozyskiwaniu i zrywce drewna

100%
Szewczyk G.
Sylwan
|
2014
|
tom 158
|
nr 11
The paper presents results of examination on snapshot observation accuracy in measuring work times at harvesting and skidding of timber. High consistency between time measurements obtained by means of photography of work day method and snapshot observations was proved. Among advantages of the snapshot method one can name possibility to assess the time of work and breaks, evaluate proportion of supplementary work times and low labour intensity of the research.
5
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Czasochłonność zrywki drewna wyciągarkami zagregowanymi z pilarkami spalinowymi w drzewostanach trzebieżowych

100%
Szewczyk G.
Sylwan
|
2011
|
tom 155
|
nr 06
6

Roboty remontowe na zbiorniku wodnym 'Poraj' w latach 2000-2006

100%
Szewczyk G.
Nauka Przyroda Technologie. Uniwersytet Przyrodniczy w Poznaniu
|
2007
|
tom 01
|
nr 2
7

Ptaki sobieszynskich stawow

75%
Szewczyk G.
Kraska. Biuletyn Mazowieckiego Towarzystwa Ochrony Fauny
|
2009
|
nr 1-2
27-31
8

Dynamika zmian szerokości przyrostów rocznych jako miara żywotności drzew w zadrzewieniach parkowych i zieleni miejskiej

63%
Szewczyk G., Guz M.
Forestry Letters
|
2012
|
tom 103
9

Rozmiar szkod powstalych w podrostach jodly i swierka w wyniku scinki i obalania drzew w przedplonowym drzewostanie sosnowym i drzewostanie swierkowym

63%
Sowa J. M., Szewczyk G.
Acta Agraria et Silvestria. Series Silvestris
|
2000
|
tom 38
75-90
The paper presents the dimension of damage in fir and spruce upgrowth during light felling, carried out in predominant stand of mountain forests. The work was limited to the analysis of damage in up growth. Weak relation between the quantity of obtained wood and the dimension of damage in renovations defined to what extent the morphological build of predominant forest and trees location in the area influence the dimension of damage during cutting. Total dimension of all types up growths damage ranged from 2.6 to 12.6 in pine stand and from 1.7 to 4.7 in spruce stand.
10

Czasochlonnosc pozyskiwania drewna z uzyciem procesora NIAB 5-15 w drzewostanach trzebiezowych

63%
Sowa J. M., Szewczyk G.
Acta Agraria et Silvestria. Series Silvestris
|
2008
|
tom 46
53-66
The aim of the present research was to determine the models of the work consumption characteristics at the work-stand of the operator of the NIAB 5-15 processor aggregated with the farm tractor. Modelling consisted in approximating the mathematical functions which described the processes under analysis. The present research was conducted in pine, fir and spruce stands during early and late thinnings, where timber skidding, debranching and manipulation was performed. The research results indicate the occurrence of proportional relations between work consumption and the volume of the harvested timber, certain elements of the working day timing and the index of the quantitative intensity of harvesting which characterizes the percentage of the number of trees removed from a stand.
11
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Model szacowania pracochłonności pozyskiwania drewna w drzewostanach ze śniegołomami

63%
Szewczyk G., Stanczykiewicz A.
Leśne Prace Badawcze
|
2012
|
tom 73
|
nr 2
12

Wplyw pokroju sciany drzew w drzewostanie sosnowym na szkody w podroscie bukowym na przykladzie wybranych powierzchni w Lesnym Zakladzie Doswiadczalnym w Krynicy

63%
Sowa J. M., Szewczyk G.
Zeszyty Naukowe Akademii Rolniczej w Krakowie. Leśnictwo
|
2000
|
tom 29
45-55
13

The analysis of the relationship between the structure of a workday and the actual skidding distance in selected timber harvesting technologies during thinnings

63%
Sowa J. M., Szewczyk G.
Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa
|
2005
|
tom 91
283-290
14
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Kosztochłonność pozyskania drewna harwesterem w drzewostanach przebudowywanych z zastosowaniem cięć częściowych

63%
Szewczyk G., Kulak D.
Sylwan
|
2013
|
tom 157
|
nr 04
Paper presents the results of research on the productivity and economic effectiveness of timber harvesting in stands managed under complex cutting systems. Use of the operating time of a work−shift, including wood processing, loads preparation for skidding and changes at work sites, was low and amounted to 0.62. The main categories of the operating time were delimbing (45%) and travelling (31%). The unit costs of work of a harvester in the analysed stands were higher amounting to 69 PLN/m3 for eight−hour shifts and 110 working days a year, and 40 PLN/m3 for sixteen−hour shifts compared to the work of the saw operator (32 PLN/m3 for the eight−hour shift).
15
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Pracochlonnosc pozyskiwania drewna w drzewostanach ze sniegolomami

51%
Sowa J. M., Szewczyk G., Stanczykiewicz A., Grzebieniowski W.
Leśne Prace Badawcze
|
2009
|
tom 70
|
nr 4
429-434
16
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Standardization of complementary work time in timber harvesting processes

51%
Kaminski K., Szewczyk G., Kocel J.
Folia Forestalia Polonica. Series A . Forestry
|
2020
|
tom 62
|
nr 4
17
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Wydajność zrywki drewna skiderem na terenach pochyłych

51%
Kulak D., Stanczykiewicz A., Szewczyk G., Wala L.
Sylwan
|
2019
|
tom 163
|
nr 07
The aim of the study is to characterise the working time structure of an operator of the LKT 82 skidder performing timber skidding on the sloping area, and to develop models of efficiency and time−consumption of the work depending on selected factors characteristic of the described transport process. The research was performed in the Sucha Forest District (S Poland). We considered two treatments: late thinning and felling performed in stands with the dominating share of beech. Logs obtained with chainsaws were initially extracted with horses and laid at the slope road. Later on the additional skidding with skidder tractor was done. Continuous timing of individual operations was performed with the use of a microcomputer equipped with time measurement software (accuracy of 1 second). We also determined skidding distance using a GPS device, the number of extracted logs in the load, and the volume of the logs. The total timing measurements lasted for a total of 70 h 24 min 27 s. During that time, the tractor made 72 cycles, transporting 998 logs with a total volume of 493.3 m³. In the mature stand, the average skidding distance amounted to approximately 1,160 m, a single load consisted of 3−4 logs with a volume of 7.7 m³. The operational efficiency of the skidding was 9.1 m³/h. In the thinning stand, the skidding distance was 1,230 m, the average load consisted of 22 logs with a volume of 5.8 m³. The operational efficiency amounted to 7.8 m³/h, on average. The working time structure was dominated by auxiliary (over 60%) and effective (nearly 30%) times. The obtained regression models of the duration of activities from the group of operational times were characterised by high correlation coefficient (about 0.75 for skidding time and driving without a load). Relatively strong relationships (r > 0.5) were also found between the times of collecting cable pulling and load attachment, and the volume of the extracted loads, and in the case of the times of collecting cable pulling also the type of treatment performed. The regression models for the times of log stacking, pulling the loads up with the winch and detaching them, despite the fact that they were statistically significant, characterised by relatively low correlation coefficients. The relationship between skidding efficiency and skidding distance was also determined (fig.). The duration of skidding cycles was described using the multiple regression with the volume of single loads and the skidding distance as the determinants. The regression models of skidding efficiency and time−consumption of skidding cycles may find practical application in estimating the efficiency of the tasks performed in stands and under conditions similar to those analysed in the present research.
18
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Rozmiar i charakter naruszeń wierzchniej warstwy gleby powstałych podczas pozyskiwania i zrywki drewna w trzebieżach wczesnych drzewostanów świerkowych

51%
Sowa J., Kulak D., Stanczykiewicz A., Szewczyk G.
Sylwan
|
2011
|
tom 155
|
nr 05
19
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Czasochłonność zrywki drewna skiderem z drzewostanu do szlaku operacyjnego

51%
Szewczyk G., Kulak D., Stanczykiewicz A.
Sylwan
|
2020
|
tom 164
|
nr 04
Skidders are used at two stages of log extraction: when pulling logs to a skid trail and for further semi−suspended log skidding along the trail to a landing. The aim of the study is to characterise the working time structure of a skidder operator performing timber extraction from the stand to the trail, and to develop time−consumption models depending on terrain slope and skidding distance. The research was done in stands situated in central and southern Poland, where late thinning and cutting in areas between tree groups (group clear cut) were performed. The timber was transported to skid trails by means of LKT 82 cable skidders. The timber was pulled to the trail on slopes with inclinations ranging from –30° (up the slope) via 0° (on a flat surface) to 38° (down the slope) at a maximum distance of 70 m. Time study of work cycles was performed and the volume of timber harvested in each package was calculated. Analyses of working time and its time consumption were performed for the operational working time. The measurements covered a total of 269 log extraction cycles with a total duration of over 20 hours. Altogether 752 logs with a total volume of over 520 m³ were extracted. The large share of time was devoted to load attaching and detaching (40%). Quite a large share of log extraction (24%) was associated with the long skidding distances. The time of stretching the collecting rope in the case of skidding up the slope (an average of 60 s) was significantly shorter than in the flat terrain or skidding down the slope (70 s). The average duration of a skidding cycle was also affected by the direction of the slope. Rectilinear relationships were determined between the duration of a skidding cycle and the terrain slope, as well as the skidding distance. The combined effect of these features on the duration of skidding was described. The duration of a skidding cycle was influenced by distance (61% of the general variability) more than the slope (16%). The time consumption of the skidding amounted to ca 12 min/m³. Two homogeneous groups were determined: uphill skidding as well as skidding in flat terrain and downhill. The relationship between the time consumption and the number of logs extracted along with their volume took the form of an exponential regression. The time consumption standard of log extraction performed with the use of a skidder along a skid trail should be supplemented with the time of forming timber packages in the stand and pulling them to the trail, with an additional distinction between the direction of skidding and terrain slope.
20

Damages to the surface layer of soil during timber harvesting using the equipment aggregated with farm tractors

51%
Kulak D., Sowa J. M., Stanczykiewicz A., Szewczyk G.
Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria
|
2012
|
tom 11
|
nr 2
In the study, impact of three devices aggregated with farm tractors on forest soil was compared – FRANSGARD 6000 GS cable winch and two processors – NIAB 5-15 and HYPRO 450. The basic difference between the above mentioned machines consists in the fact that the cable winch skids debranched tree stems while processors skid the whole trees, including their tree-tops. The percentage of soil injured in late pine stand thinning reached, respectively: 1.2%, 2.2% and 5.5%. The analysis of significance of differences in Ug indicators characterising the damages induced has shown that only the indicator computed for HYPRO processor is significantly higher than the others. However, as the simulation performed has confirmed, appropriate thickening of skidding routes enables to achieve a comparable level of damages for all the machines examined. Taking into account the impact on forest soil, application of processors aggregated with farm tractors can be recommended for thinning stands.
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