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    Wyświetlanie 1-11 z 11
    Tytuł:
    Zrywka drewna średniowymiarowego w drzewostanach trzebieżowych przy użyciu ciągnika rolniczego z przyczepą nasiębierną
    Timber extraction in thinned stands using agricultural tractor coupled with a trailer with a hydraulic crane
    Autorzy:
    Naskrent, B.
    Polowy, K.
    Grzywiński, W.
    Sobczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/979600.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    drzewostany przedrebne
    trzebiez pozna
    pozyskiwanie drewna
    drewno sredniowymiarowe
    zrywka drewna
    zrywka nasiebierna
    fotografia dnia roboczego
    struktura czasu pracy
    timber extraction
    time studies
    forest trailer
    working day photography
    Opis:
    The amount of timber extracted from Polish forests is expected to increase in near future. The most common equipment for timber extraction is an agricultural tractor with a trailer equipped with a hydraulic crane. The research was carried out in the Wymiarki Forest District (Regional Directorate of the State Forests in Zielona Góra) in the third (TP1) and fourth age class (TP2) in Scots pine stands, during extraction of timber from thinning. Extraction was carried out using BELARUS MTZ 1221.2 agricultural tractor with PALMS 120 forest trailer equipped with PALMS 700 hydraulic crane. The scope of the study was to conduct time studies of extraction process and to estimate the extraction productivity as well as time and fuel consumption. Working time was measured by stopwatch, while the forwarding distance was determined with measuring wheel. The exact number of logs in each load was established. Average volume of each log and each load was calculated. The dominant work time category was effective working time 74.78% (TP1) and 73.60% (TP2), while the prevailing work task was loading 56.82% (TP1) and 58.99% (TP2). In older stands, the extraction productivity was higher than in younger ones reaching 11.28 and 9.62 m3/h, respectively. Statistical analysis proved that extraction distance significantly affect productivity and time consumption. With increasing extraction distance productivity decreases and time consumption increases. Fuel consumption was exactly the same in younger and older stands (0.52 l/m3).
    Źródło:
    Sylwan; 2019, 163, 02; 121-129
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wydajność zrywki drewna skiderem na terenach pochyłych
    Efficiency of timber skidding on the slopes
    Autorzy:
    Kulak, D.
    Stańczykiewicz, A.
    Szewczyk, G.
    Wala, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/980264.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    zrywka drewna
    skidery
    struktura czasu pracy
    wydajnosc pracy
    modelowanie
    timber harvesting
    skidding
    working time
    modelling
    Opis:
    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.
    Źródło:
    Sylwan; 2019, 163, 07; 601-609
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura rocznego czasu pracy leśniczych
    The structure of foresters annual work-time
    Autorzy:
    Kocel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1016323.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    struktura czasu pracy
    stanowisko lesniczego
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    lesnictwo
    state forests national forest holding
    foresters
    foresters' work−time structure
    annual work−time
    Opis:
    The structure of the annual work−time of the staff from all kinds of forest sub−districts in the State Forests National Forest Holding (SF), the structure of the average annual work−time of the staff running exclusively the SF forest sub−districts and the structure of the average, annual work−time of the staff from the SF forest sub−districts supervising the forests that are not the property of the State Treasury were studied on the basis of questionnaire surveys conducted in 2004. The studies showed that the staff from all kinds of forest sub−districts spent most of their work−time for the harvesting and sale of timber (36.23% of their annual time on average). Silviculture is the second largest time−consuming activity performed by foresters, accounting for 16.47% of their annual work−time, while forest protection accounts for 12.88% and observations of the forest status – 7.55% of forest sub−district staff's annual work−time.
    Źródło:
    Sylwan; 2007, 151, 01; 3-10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura roczna i rzeczywisty czas pracy na stanowiskach leśniczego i podleśniczego
    Annual structure and actual worktime at the forester and deputy forester workstations
    Autorzy:
    Grzywiński, W.
    Tomczak, A.
    Jelonek, T.
    Burzyńska-Jędrzejczak, G.
    Naskrent, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/985711.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    stanowisko lesniczego
    stanowisko podlesniczego
    czas pracy
    struktura czasu pracy
    struktura roczna czasu pracy
    rzeczywisty czas pracy
    activity structure
    worktime
    overtime
    forester
    deputy forester
    Opis:
    The aim of the study was to recognize the annual worktime structure and the actual number of working hours at the forester and deputy forester workstations in the State Forests. The research was carried out on the sample group of 462 workers in all regional directorates of the State Forests in 62 forest districts and 242 forest ranges. The study group consisted of 21 (4.5%) forest foresters from one−man forest districts (L1), 222 (48.1%) foresters and 219 deputy foresters (47.4%) from two−men forest ranges (L2 and PDL respectively). Altogether 17 groups of activities were distinguished. The workers were studied in spring, summer, autumn, and winter. Every time the research was conducted during one full week (Monday−Sunday). In case of two−men forest districts, both workers were studied simultaneously. The measurement of timework was carried out with the specially designed mobile application LP1 operating in Android system. The duration of particular activities at L1 and L2 workstations was similar. The office work constituted most of their worktime: 109.7 minutes (22.9%) for L1 and 111.5 min (23.3%) for L2. Transportation took 80.2 and 84.8 min (17.7 and 17.6%), whereas wood sale required 69.7 and 62.8 min (14.5 and 13.1%) for L1 and L2 work stations respectively. At PDL workstation passages took 84.7 min (17.6%), wood quality inspection and registration – 65.4 min (13.6%), and office work – 60 min (12.5%). The tasks comprising preparation, harvesting and sale of raw timber took 34.9% of L1 worktime, 32.5% in case of L2 and 41.6% for PDL’s worktime. All employees devoted the least of their worktime to tasks connected with fire precautions, nature conservation, and environmental education (tab. 1). The overrunning of normative worktime was recorded at all studied workstations. The mean daily worktime for PDL amounted to 8.17 hrs, whereas for L1 and L2 it was 8.47 and 8.52 hrs respectively. Except extra working hours during the working week, the overtime during the days−off was recorded too. Most of time spent on work in such situations was recorded for L1 (1.69 hrs on average per week), while the least (0.97 hrs) for L2 workstation.
    Źródło:
    Sylwan; 2019, 163, 05; 355-364
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura poszczególnych kategorii czasu przy zrywce dłużyc ciągnikami
    Structure of particular time categories at skidding logs with tractors
    Autorzy:
    Wojtkowiak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/822314.pdf
    Data publikacji:
    1991
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    pozyskiwanie drewna
    dluzyce
    zrywka drewna
    zrywka ciagnikiem
    ciagnik Ursus C-355
    ciagnik Tree Farmer C-5-D
    ciagnik LKT 80
    struktura dnia roboczego
    czas pracy
    wykorzystanie czasu
    Źródło:
    Sylwan; 1991, 135, 10
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura czasu pracy i wydajność maszyn podczas rozdrabniania karp
    Time usage and efficiency of machinery during stump crushing
    Autorzy:
    Galezia, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/46303.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    pozyskiwanie biomasy
    karpina
    rozdrabnianie
    maszyny
    ladowarka czlolowa Doosan DL 250
    rozdrabniacz wolnoobrotowy Doppstadt DW 3060
    przesiewacz bebnowy Doppstadt SM 518
    ciagnik MAN 27.463
    czas pracy
    struktura czasu pracy
    wydajnosc pracy
    Źródło:
    Leśne Prace Badawcze; 2017, 78, 4
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktura czasu pracy harwesterów podczas pozyskania przygodnego
    Structure of the operating time of the harvesters during casual logging
    Autorzy:
    Dvorak, J.
    Walczyk, J.
    Hoskova, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989858.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    usuwanie szkod
    pozyskiwanie drewna
    harwestery
    struktura czasu pracy
    wydajnosc pracy
    kleski zywiolowe
    harvester
    operational time
    random logging
    productivity
    Opis:
    Natural disasters often cause that large share of acquisitions are performed under contingent conditions. High concentration of raw wood material and urgent need for its rapid removal from the forest demand use of harvesters. Material acquisition in such conditions is much harder and causes loss of performance for working machines. The objective of this paper was to determine the decrease in harvester performance during acquisition of fallen trees, wood scrap and suspended trees compared to acquisition of undamaged trees. Performance analysis was conducted on 10 harvesters from different power class working in the Czech Republic in years 2007−2012. The time structure was determined for the timber acquisition under contingent conditions in 22 forest stands. Later on it was compared with acquisition under normal conditions, i.e. scheduled acquisition on areas with good load carrying capacity and without obstacles and with an inclination up to 33%. There was significant difference in the mean operating time requirements between harvesters from the analysed power classes. Machines form 1st class differed significantly form devices from 2nd and 3rd classed. Results indicate that in spruce stands with wood scrap time consumption increases by 7% when average and high performance harvesters are used. The increase is by 33% during acquisition of fallen trees, while time consumption increases by as much as 79% during acquisition of suspended trees. During acquisition of subversion and wood scrap, performance of average and high performance harvesters ranged between 1.71 up to 17.37 m³/h depending on thickness and type of the damage to obtained trees. Important achievement of presented research is correction factors allowing to change harvester performance standards, while acquisition of fallen trees, wood scrap and suspended trees. Average value of correction factor is 1.19.
    Źródło:
    Sylwan; 2015, 159, 04; 300-306
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czasochłonność zrywki konnej w drzewostanach trzebieżowych
    Time consumption of horse skidding operations in thinned stands
    Autorzy:
    Szewczyk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009544.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    drzewostany jodlowe
    drzewostany bukowe
    drzewostany swierkowe
    trzebieze
    zrywka drewna
    zrywka konna
    czasochlonnosc
    struktura czasu pracy
    horse skidding
    time consumption
    work time
    workday structure
    Opis:
    The paper presents time consumption assessment model (EST) of horse skidding operations in thinned stands taking into consideration factors related to stand, workday structure and characteristics of harvested timber. Significant differences in time consumption levels were observed between early and late thinning operations, as well as between examined pine, beech, spruce and fir stands. The strongest correlation between the EST and the analyzed variables was observed in the case of factors related to the volume of extracted timber.
    Źródło:
    Sylwan; 2010, 154, 01; 52-63
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of performance of short tree logging with farm tractor and logging trailer
    Analiza wydajności zrywki drewna krótkiego przy użyciu ciągnika rolniczego i przyczepy zrywkowej
    Autorzy:
    Kormanek, M.
    Fiszer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/93596.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    logging unit
    performance
    working time structure
    agregat zrywkowy
    wydajność
    struktura czasu pracy
    Opis:
    The paper presents analysis of efficiency of the logging unit comprising Belarus 820 farm tractor and PD80 logging trailer equipped with Ryś-1 crane. Analysis was made based on the working day timing. The unit logged 1- meter long tree pieces (hornbeam, oak, birch) from the area where material for logging was distributed irregularly on the entire felling site. Unfavourable atmospheric conditions were reported during the working day (a thick layer of snow, low temperature, not frozen soil) which could have influenced the unit operation performance. Despite that the performance of the logging unit was comparable to similar logging units described in the literature. Determined coefficient of use of the operating time of the machine K02 was 0.93, coefficient of use of the shift working time K04 - 0.9, coefficient of use of the shift exploitation time K07 - 0.8. Hourly performance in the shift exploitation time was 4.98 m3 h-1 , efficiency in the shift working time W02 - 4.80 m3 h-1 and performance in the general shift time W07 - 4.30 m3 h-1.
    W pracy przedstawiono analizę wydajności zestawu zrywkowego składającego się z rolniczego ciągnika uniwersalnego Belarus 820 oraz przyczepy zrywkowej PD 80 wyposażonej w żuraw Ryś-1. Analizy pracy zestawu dokonano w oparciu o chronometraż dnia roboczego. Zestaw w trakcie badań zrywał sortyment o długości 1 metra (grab, dąb, brzoza) z powierzchni gdzie materiał do zrywki był rozłożony w sposób nieuporządkowany na całej powierzchni zrębu. Jak stwierdzono w ciągu dnia roboczego panowały niesprzyjające warunki atmosferyczne (gruba warstwa śniegu, niska temperatura, niezamarznięta gleba), co mogło wpłynąć na efektywność pracy zestawu. Mimo to, wydajności uzyskane przez zestaw zrywkowy były porównywalne z podobnymi zestawami zrywkowymi opisywanymi w literaturze. Wyznaczony współczynnik wykorzystania operacyjnego czasu pracy maszyny K 02 wyniósł 0,93, współczynnik wykorzystania roboczego czasu zmiany K04 - 0,9, współczynnik wykorzystania eksploatacyjnego czasu zmiany K 07 - 0,8. Godzinowa wydajność w eksploatacyjnym czasie zmiany W 02 wyniosła 4,98 m3 h-1 , wydajność w roboczym czasie zmiany W 02 - 4,80 m3 h-1 , a wydajność w ogólnym czasie zmiany W 07 - 4,30 m3 h-1.
    Źródło:
    Agricultural Engineering; 2018, 22, 2; 29-38
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wykorzystania czasu pracy kierowców
    Autorzy:
    Lorencowicz, E.
    Jarmuł, R.
    Koszel, M.
    Przywara, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/134660.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    czas pracy
    efektywność pracy kierowców
    struktura czasu pracy
    labour time
    efficacy of drivers labour
    labour time structure
    Opis:
    W artykule przedstawiono najważniejsze czynniki i ograniczenia wpływające na efektywność wykorzystania czasu pracy kierowców. Badania wykonało dwóch kierowców w ciągu czterech tygodni, pracując na trasach dalekodystansowych z naczepą podkontenerową oraz kurtynową. Średni dzienny czas pracy kierowców wyniósł odpowiednio 11:55 i 10:27, dzienny czas jazdy – 5:30 i 6:21, a odległość dzienna 499 i 506 km. Współczynnik efektywności czasowej osiągnął wartość 0,45.
    The most important factors and limitations, that affecting of the efficiency of time consumption by truck drivers were presented. The study was done basic on data collected by two drivers during four weeks of work on long-haul routes with container and curtain trailer. The average daily working time of drivers was 11 hours 55 minutes and 10 hours 27 minutes. Daily driving time 5 hours 30 minutes and 6 hours 21 minutes. Daily distance 499 km and 506 km per driver. Time efficiency factor reached 0.45.
    Źródło:
    Problemy Transportu i Logistyki; 2017, 38, 2; 27-38
    1644-275X
    2353-3005
    Pojawia się w:
    Problemy Transportu i Logistyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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