Croatian Journal of Forest Engineering : Journal for Theory and Application of Forestry Engineering最新文献

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Influence of Cutting Attachment on Noise Level Emitted by Brush Cutter during Tending of Young Forests 幼林抚育过程中采伐附件对电刷机噪声水平的影响

Croatian Journal of Forest Engineering : Journal for Theory and Application of Forestry Engineering Pub Date : 2020-01-31 DOI: 10.5552/crojfe.2020.657

Bartłomiej Naskrent, W. Grzywiński, A. Łukowski, K. Polowy

{"title":"Influence of Cutting Attachment on Noise Level Emitted by Brush Cutter during Tending of Young Forests","authors":"Bartłomiej Naskrent, W. Grzywiński, A. Łukowski, K. Polowy","doi":"10.5552/crojfe.2020.657","DOIUrl":"https://doi.org/10.5552/crojfe.2020.657","url":null,"abstract":"A brush cutter is the most frequently used equipment for tending young forests. When cutting unwanted vegetation, the operator is exposed to various harmful factors, such as: a forced body position, noise, vibrations and exhaust emissions. In this study, the impact of cutting attachment type on the noise level during tending of young pine stands was examined. The attachments used during the tests included: a wire head and cutting blades with 2, 3 and 24 cutting teeth. The research was carried out on 2–3 year old Scots pine plantations covered with three types of vegetation: herbaceous, mixed and woody. It was proven that the the wire head was the device that generated the highest level of noise. In the case of cutting blades, the number of cutting teeth was the important factor. The greater the number of teeth in the cutting blades, the lower the noise level the device produced. There was no significant influence of vegetation type on noise emission level. Based on the results, in order to minimize operators’ exposure to noise, the use of wire cutting attachment should be limited.","PeriodicalId":314013,"journal":{"name":"Croatian Journal of Forest Engineering : Journal for Theory and Application of Forestry Engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116422096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Time Consumption Analysis of Forwarder Activities in Thinning 货代减薄作业的时间消耗分析

Croatian Journal of Forest Engineering : Journal for Theory and Application of Forestry Engineering Pub Date : 2020-01-31 DOI: 10.5552/crojfe.2020.615

E. Hildt, Andrés Leszczuk, P. M. Donagh, T. Schlichter

{"title":"Time Consumption Analysis of Forwarder Activities in Thinning","authors":"E. Hildt, Andrés Leszczuk, P. M. Donagh, T. Schlichter","doi":"10.5552/crojfe.2020.615","DOIUrl":"https://doi.org/10.5552/crojfe.2020.615","url":null,"abstract":"Forwarding can be divided into separate work elements. These are affected by several factors: forwarding distance, load volume, and types of assortments harvested. For a detailed planning of thinning, productivity models should include these factors. This study analysed the time consumption of forwarder thinning operations in five pine plantations in the north-east of Argentina, determining how the log size and log concentration affect each work element. Timeand-motion studies were carried out, recording the activities with digital video cameras, and tracking the forwarder movements with global navigation satellite system (GNSS) receivers. Different linear mixed models were fitted to estimate the time consumption of each work element in relation to different predictive factors. When driving on the road, the forwarders had an average speed of 71.6 m min empty and 75.7 m min loaded. When driving in the stand, the average speed was 56.9 m min empty and 52.2 m min loaded. These speeds did not correlate with the forwarder size or load volume. For the loading and unloading elements, the linear mixed model explained 56% and 49% of the variability considering only the fixed effect of the logs size and the load volume. For driving while loading, the total volume loaded, and the log concentration of the assortment loaded explained 50% of the time consumption variability, with 17% being explained by random effects. The general time and productivity model developed can be applied to support accurate decisions in the process of thinning planning.","PeriodicalId":314013,"journal":{"name":"Croatian Journal of Forest Engineering : Journal for Theory and Application of Forestry Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131405910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10