Šumske ceste, građevinske objekte koji tijekom čitave godine omogućuju promet motornim vozilima, nakon izgradnje treba redovito održavati, kako bi tijekom svoga vijeka trajanja mogle ispuniti sve ...zadaće predviđene šumskogospodarskim planovima. Kvalitetno i pravovremeno održavanje produljuje vijek trajanja šumskih cesta, smanjuje troškove pogona motornih vozila i učestalost njihova popravka, čini šumske ceste provoznima tijekom čitave godine te povećava sigurnost svih sudionika u prometu. Poznavanje postojećeg stanja primarne šumske prometne infrastrukture od iznimne je važnosti pri optimizaciji radova održavanja šumskih cesta.Istraživanje je provedeno na 7,031 km makadamskih šumskih cesta gorskih prebornih šuma u g.j. „Belevine“, nastavno-pokusnog šumskog objekta Šumarskog fakulteta Sveučilišta u Zagrebu, Zalesina. Analizirana je metodologija izradbe, propisani sadržaj i mogućnosti primjene postojećeg registra primarne šumske prometne infrastrukture. Razvijena je metodologija izradbe detaljnog (potpunog/novog) registra primarne šumske prometne infrastrukture (prikupljanje, obrada i interpretacija podataka). Definirane su najčešće vrste i intenzitet oštećenja šumskih cesta gorskog reljefnog područja. Uspostavljen je detaljan registar primarne šumske prometne infrastrukture sa svim cestovnim objektima. Sva su oštećenja šumskih cesta klasificirana, kvantificirana i fotodokumentirana. Raščlanjena je mogućnost i opravdanost primjene detaljnog registra primarne šumske prometne infrastrukture u operativnom šumarstvu.Primjena rezultata istraživanja u operativnom šumarstvu je moguća, a s obzirom na postojeće te poglavito buduće učešće troškova održavanja u ukupnim troškovima povezanima sa šumskim cestama i preporučljiva. Izradom kvalitetnih, metodološki ujednačenih, elaborata održavanja šumskih cesta, utemeljenih na novoj metodologiji izradbe detaljnog registra primarne šumske prometne infrastrukture, može se odabrati najpogodnija tehnologija i planirati dinamika radova održavanja, uz istovremenu kontrolu i racionalizaciju pripadajućih troškova.
Thesis (M.S.)--Oregon State University, 1999.
Typescript (photocopy). Includes bibliographical references (leaves 29-31). Also available on the World Wide Web.
Thesis (M.S.)--Oregon State University, 1984.
Typescript (photocopy). Includes bibliographical references (leaf 47). Also available on the World Wide Web.
Forest roads are an important element in forest management as they provide infrastructure for different forest stakeholder groups. Over time, a variety of road assessment concepts for better planning ...were initiated. The monitoring of the surface cross-section profile of forest roads particularly offers the possibility to take early action in restoring a road segment and avoiding higher future costs. One vehicle-based monitoring system that relies on ultrasound sensors addresses this topic. With advantages in its dirt influence tolerance and high temporal resolution, but shortcomings in horizontal and vertical measuring accuracy, the system was tested against high resolution terrestrial laser scanner (TLS) data to find and assess working scenarios that fit the low- resolution measuring principle. In a related field test, we found low correct road geometry interpretation rates of 54.3% but rising to 91.2% under distinctive geometric properties. The further applied line- and segment-based method used to transform the TLS data to fit the road scanner measuring method allows the transfer of the road scanner evaluation principle to point-cloud or raster data of different origins.
The accurate prediction of forest road pavement performance is important for efficient management of surface transportation infrastructure and achieves significant savings through timely intervention ...and accurate planning. The aim of this paper was to introduce a methodology for developing accurate pavement deterioration models to be used primarily for the management of the forest road infrastructure. For this purpose, 19 explanatory and three corresponding response variables were measured in 185 segments of 50 km forest roads. Logistic regression (LR) and artificial neural networks (ANNs) were used to predict forest road pavement deterioration, Pothole, rutting and protrusion, as a function of pavement condition, environmental factors, traffic and road qualify. The results showed ANNs and LR models could classify from 82% to 89% of the current pavement condition correctly. According to the results, LR model and ANNs predicted rutting, pothole and protrusion with 83.5%, 83.00% and 81.75%, 88.65% and 85.20%, 80.00% accuracy. Equivalent single axle load (ESAL), date of repair, thickness of pavement and slope were identified as most significant explanatory variables. Receiver Operating Characteristic Curve (ROC) showed that the results obtained by ANNs and logistic regression are close to each other. Keywords: forest road maintenance, pavement management system, pavement strength, pothole, protrusion, rutting
The use of electronics, close-range sensing, and artificial intelligence has changed the management paradigm in many contemporary industries in which Big Data analytics by automated processes has ...become the backbone of decision making and improvement. Acknowledging the integration of electronics, devices, sensors, and intelligent algorithms in much of the equipment used in forest operations, as well as their use in various forestry-related applications, it is apparent that many disciplines within forestry and forest science still rely on data collected traditionally, which is resource-intensive. In turn, this brings limitations in characterizing the specific behaviors of forest product systems and wood supply chains, and often prevents the development of solutions for improvement or inferring the laws behind the operation and management of such systems. Undoubtedly, many solutions still need to be developed in the future to provide the technology required for the effective management of forests. In this regard, the Special Issue entitled “Electronics, Close-Range Sensors and Artificial Intelligence in Forestry” highlights many examples of how technological improvements can be brought to forestry and to other related fields of science and practice.
To ensure the care of forests, it is necessary to make them sufficiently accessible by forest roads. The basic working tool are hammers, or round shanks of various shapes, composed of a body and a ...tip. They are subject to a strong abrasive environment, which often leads to damage up to the complete destruction of the functional part of the tool. For these reasons, it is necessary to deal with the possibilities for increasing their lifetime. One of the possibilities of increasing the service life of these tools is hardfacing by welding. The article deals with the abrasive resistance of the original material of the tool and the hardfacing materials. Based on the chemical analysis of the base material of the tool, we found that the tool is made of manganese steel 38Mn6. This material was used as a standard and was compared with the hardfacing materials Abradur 58, E DUR 600, UTP DUR 600 and OK 84.58. Electron microscopy was used to evaluate the microstructure. Next, the Rockwell hardness measurement was performed on the samples. The original tool material 38Mn6 reached the lowest hardness value, namely, 21 HRC. The highest value was reached by the hardfacing material E DUR 600, namely, 59 HRC. Subsequently, a test of resistance to abrasive wear was performed according to GOST 23.208-79. Based on this test, we can conclude that the highest value of resistance to abrasive wear was achieved by Abradur 58. Even though the hardness of this coating was slightly lower than the hardfacing material E DUR 600, specifically 56 HRC, we can state that this hardfacing material (Abradur 58) achieved the best results among the investigated materials.
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