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木材运输车辆翻新轮胎热-结构耦合场数值模拟分析
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作者 齐晓杰 于建国 《东北林业大学学报》 CAS CSCD 北大核心 2010年第6期104-105,108,共3页
林区木材运输车辆翻新轮胎经常因为轮胎温升产生胎面和胎体的脱层、撕裂,为翻新轮胎的失效分析及合理使用,建立了翻新子午线轮胎滚动状态下稳态热学分析模型,并进行了温度测定试验。在此基础上进行了热-结构耦合场的数值模拟、仿真计算... 林区木材运输车辆翻新轮胎经常因为轮胎温升产生胎面和胎体的脱层、撕裂,为翻新轮胎的失效分析及合理使用,建立了翻新子午线轮胎滚动状态下稳态热学分析模型,并进行了温度测定试验。在此基础上进行了热-结构耦合场的数值模拟、仿真计算及试验分析,较真实地反映了翻新轮胎的热应力状况。 展开更多
关键词 木材运输车辆 翻新轮胎 有限元 稳态温度分析 热-结构耦合分析
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Timber Trucking Characteristics in Greece
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作者 Evangelos Karagiannis Petros A. Tsioras Ploutarchos Kararizos 《Journal of Environmental Science and Engineering(B)》 2012年第9期1079-1086,共8页
Wood transportation begins from the landing or the forest road where the processed wood assortments are placed, they are loaded on trucks and then transported to the wood-working industry and/or the consumption center... Wood transportation begins from the landing or the forest road where the processed wood assortments are placed, they are loaded on trucks and then transported to the wood-working industry and/or the consumption centers. Wood transportation in Greece is carried out, almost exclusively, by trucks. The aim of this study is to analyze the evolution of timber trucking in Greece through the analysis of wood transportation waybills. A total of 1,471 waybills have been collected and analyzed that cover the period 1981-2008 from nine of the most productive and representative forest districts in Greece, in terms of timber production. The final dataset included information on the type and technical characteristics of truck types, the transported wood quantities and haulage distances. Furthermore, data on the wood transportation cost for the year 2010 have been collected and analyzed. According to the results, the number of two-axle trucks that dominated in the 1980s is reducing rapidly, mostly to the benefit of larger three-axle and four-axle trucks. More than three quarters (77%) of wood transportation is conducted in the period June-October. Mean vehicle load per vehicle type differs between conifer and broadleaved species from 7.1% up to 23.9%. Transportation of stacked wood with semitrailers is conducted with overloaded trucks, which could entail serious problems for public safety and the condition of road network. New design standards will enhance serviceability of the wood transportation routes and environmental protection. 展开更多
关键词 Wood transportation trucks permissible truck load season of wood transportation Greece.
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