Bibliographic Details
| Title: |
ИССЛЕДОВАНИЕ РАВНОМЕРНОГО ДВИЖЕНИЯ В ВОДЕ УСТРОЙСТВА ДЛЯ ФОРМИРОВАНИЯ ДВУХЪЯРУСНЫХ ПАКЕТНЫХ СПЛОТОЧНЫХ ЕДИНИЦ: THE STUDY OF EVEN MOVEMENT IN WATER OF THE DEVICE TO MAKE THE PACKAGED BILEVEL RAFTING UNITS |
| Source: |
Vestnik of Volga State University of Technology Series Forest. Ecology. Nature Management. :41-49 |
| Publisher Information: |
Volga State University of Technology, 2021. |
| Publication Year: |
2021 |
| Subject Terms: |
сплоточные единицы, древесное сырьё, timber rafting, сопротивление воды, лесосплав, круглые лесоматериалы, water resistance, rafting units, wood raw material, round timber |
| Description: |
Дана краткая информация об области применения устройства для формирования двухъярусных пакетных сплоточных единиц и о его конструкции. Изложены сведения о факторах, которые теоретически могут влиять на сопротивление воды перемещению указанного устройства. Приведена регрессионная модель для определения коэффициента общего сопротивления воды упомянутому перемещению, полученная по результатам исследования на физической модели. Дана оценка влияния основных факторов на величину этого коэффициента. Рекомендована формула для вычисления силы рассматриваемого сопротивления. Introduction. A device to make the packaged bilevel rafting units is an important constituent in implementing of the concept of a unified unit load developed to ensure the environmentally friendly use of the net of medium and minor rivers for economically sound delivery of round timber from far forest districts. The goal of the research is to ensure the possibility to calculate the hydrodynamic resistance to even movement of the device to make the packaged bilevel rafting units taking into account the possible effect of closeness of bed in the area of towing. The authors used the experimentally-theoreticmethod of research. The experimental research was carried out according to the theory of dimensions and similarity and methods of mathematical statistics. Results and discussion.At the stage of theoretic research, the factors influencing the power of water resistance and even movement of the bundling device were revealed. Dependence is given simbolically, in criterial, dimensionless fashion. The expediency of fixing the dimensionless parameters, distinguishing the shape of floating structure of the device in lower than water level, and exclusion of Reynolds number of the list of defining factors is grounded. The obtained expression is a symbol dependence of the coefficient of the total water resistance from Froude number and relative depth. The experimental research on the physical model of floating platform of the bundling device to obtain the specified dependence in an explicit form is carried out. This dependence is a regression equation of the second order. Calculation of drag coefficient with it makes it possible to determine the water resistance force using the Newton formula, arising when towing the device. The assessment of the effect of factors demonstrated that the resistance coefficient intensively increased with the increase of the Froude number, which can be explained with higher in comparison with timber-hauling units speed of the bundling device movement. The closeness of bed predictably brings to the considerable increase in resistance to movement but this factor has the least influence on the specified coefficient. Conclusion. The research results make it possible to rationally plan the actions in towing the bundling device from one platform to the other one.The factors influencing the hydrodynamic resistance and an even device movement of the packaged bilevel rafting units were revealed. The elaborated regression model together with the recommended analytic formula makes it possible to calculate the force of hydrodynamic resistance applying on the bundling device when its even movement. |
| Document Type: |
Article |
| Language: |
Russian |
| ISSN: |
2306-2827 |
| DOI: |
10.25686/2306-2827.2020.4.41 |
| Accession Number: |
edsair.doi...........cbc20bdf46ac64f8d28e09ccdb30d5d9 |
| Database: |
OpenAIRE |