The branched structure of timber consumption is typical for timber production assumes the formation of an effective plan of supply taking into account restrictions on delivery time. To solve this problem it has been proposed a method based on the use of the criterion of priority transport service for enterprises-consumers. This is the function of urgency of timber transportation. The results of theoretical  investigations aimed to obtain analytical ratio of definition of urgency timber transportation on basic  schemes of transportation process organization

Korolenia, R. O.

The branched structure of timber consumption is typical for timber production assumes the formation of an effective plan of supply taking into account restrictions on delivery time. To solve this problem it has been proposed a method based on the use of the criterion of priority transport service for enterprises-consumers. This is the function of urgency of timber transportation. The results of theoretical investigations aimed to obtain analytical ratio of definition of urgency timber transportation on basic schemes of transportation process organization

Belarusian State Technological University

ISSN 1683-0377. Proceedings of BSTU. 2012. Issue 2. Wood and Woodworking Industry 70 UDC 630*63:630*37 R. O. Korolenia, assistant lecturer (BSTU) DETERMINATION OF THE URGENCY OF TIMBER TRANSPORTATION USING BASIC  SCHEMES OF TRANSPORTATION PROCESS ORGANIZATION The branched structure of timber consumption is typical for timber production assumes the forma-tion of an effective plan of supply taking into account restrictions on delivery time. To solve this prob-lem it has been proposed a method based on the use of the criterion of priority transport service for en-terprises-consumers. This is the function of urgency of timber transportation. The results of theoretical investigations aimed to obtain analytical ratio of definition of urgency timber transportation on basic schemes of transportation process organization. Introduction. In timber industry of the Repub-lic of Belarus assortment logging timber is cur-rently dominated. Harvested assortments are avail-able for internal customers of the enterprise (own shops, boiler rooms, etc.) and outside customers (wood processing companies, transfer stations, trade organization of harvested timber, etc.). Many forestries of the Republic of Belarus are the pri-mary wood processing plants (producing round logs, sawn wood, split wood, etc.), significant amounts of finished goods which are exported. In addition, use of wood raw material to obtain en-ergy is currently of particular importance. In such circumstances, producers and suppliers of wood raw material to consumers are to form plans for the delivery not only in terms of minimiz-ing the total transportation cost, but strictly main-taining the delivery term stated by the customer. When there is a limited number of the tractor-drawn harvesters, a branched system of “procurer” – “customer”, inconsistencies of calculated optimum forest roads density, which is characteristic of the timber industry of the Republic of Belarus, the or-ganization of rhythmic and well-timed supply of tim-ber to consumers is essential. To solve it, the previ-ously proposed method for predicting the transport phase of the technological process of logging, which is based on the criterion of priority traffic – a function of the urgency of timber transportation (FUTT) [1, 2]. For effective practical use of this method it is useful to consider the method of calculation for different schemes FUTT organization of the transportation process of timber supply to consumers. Main part. From the standpoint of the organi-zation of the transportation process, during trans-portation of timber to consumers, there are three main schemes of work of the hauling rig depending on the type of linkage between the places of load-ing and unloading, “one to one”, “one to many” and “many to many” [3, 4]. For the scheme “one to one” when timber is supplied only one variant of the organization transportation route is used, it is called pendulum (Fig. 1). Under this option, a given volume of round timber from a loading point or transitional area is transported to one consumer.  Fig. 1. Organization of supply  by pendulum routes  For the scheme “one to many” two schemes of transport routes are used: radial and pendulum routes. In radial route (Fig. 2) timber form a load-ing point or a transitional area is successively transported to different unloading areas.   Fig. 2. Organization of supply by radial routes  When the pendulum method is used, timber is delivered from one loading point or a transitional area to several sites (Fig. 3).   Fig.3. Organization of timber supply  by pendulum routes Forest Industry Complex. Transportation and Technological Problems 71For schemes “many-to-many” four different organizations of supply routes are used: accumu-lative, delivered, accumulative and delivered, and cyclic. When working on accumulative route (Fig. 4), timber from several loading points or transitional pointsis delivered to one unloading area.   Fig. 4. Organization of supply  by accumulative routes  When accumulative and delivered route (Fig. 5) is used timber from several loading areas is carried to some unloading areas.   Fig. 5. Organization of supply by accumulative and delivered routes  When the cyclic route (Fig. 6) is used timber from different loading areas is consequently deliv-ered to different unloading areas. In the supply of timber to consumers in the regulatory interval of delivery the function of ur-gent timber transportation in general can be pre-sented in the ratio (1) [1, 2, 5]. 1( ) ( ) ,dW t Q t CT t⎛ ⎞= ⋅ ⋅⎜ ⎟−⎝ ⎠    (1) where Q(t) – the volume of harvested timber de-clared for carriage, m3; C – total unit cost of 1 m3 of timber, BYR, thousands; Тd – determined time for delivery of the entire volume of timber; t – the total amount of time that passed from the time of application for delivery of timber and directly time rate for supply of the stated volume of tim-ber, including time to implement the transporta-tion process, h.   Fig. 6. Organization of supply by cyclic routes  Time to implement the transportation process can significantly affect the obtained value of FUTT and depends on the choice of wood supply schemes, the tractor-drawn harvesters used for work, qualitative and quantitative indicators of transportation network, which are used to de-velop the supply routes. To determine FUTT considering these factors, the structure of time spent on various shipping timber supply schemes has been analyzed. Thus, for the supply of wood by “one to one” scheme the duration of the de-livery can be presented by a function (2). d ir dr do di dmt t t t t t= + + + + ,  (2) where tir – duration of idle run route, h; tdr – duration of run with load, h; tdo – duration of load-ing and unloading operations, h; tdi – duration of idle hours of hauling equipment (regulated and non-regulated), h; tdm – duration maneuvering in loading and unloading areas, h. Duration of delivery for the supply scheme “one to many” is presented in terms of dependence (3). 1d ir dr c do di dmt t t t t t t= + + + + + ,         (3) where tc1 – duration of crossing for a full load of vehicles, h. Duration of delivery for the supply scheme “many to many” is defined as a function (4). 1 2d ir dr c c do di dmt t t t t t t t= + + + + + + ,     (4) where tc2 – duration of crossing for a full load of vehicles, h. Let define Tt as the time from the moment  of signing the contract for the supply. Taking into consideration the above obtained dependences,  we get formulas for determining the function of ISSN 1683-0377. Proceedings of BSTU. 2012. Issue 2. Wood and Woodworking Industry 72 urgency of timber transportation used for timber production in Belarus schemes of organization of the transportation process of harvested timber: – for the scheme “one to one” ( ) ( )W t Q t C= ⋅ ×  1 ;( )d t ir dr do di dmT T t t t t t⎛ ⎞×⎜ ⎟− + + + + +⎝ ⎠ (5) – for the scheme “one to many” ( ) ( )W t Q t C= ⋅ ×  11 ;( )d t ir dr c do di dmT T t t t t t t⎛ ⎞×⎜ ⎟− + + + + + +⎝ ⎠   (6) – for the scheme “many to many” ( ) ( )W t Q t C= ⋅ ×  1 21 .()d t ir dr c cdo di dmT T t t t tt t t⎛ ⎞⎜ ⎟⎜ ⎟×⎜ ⎟− + + + + +⎜ ⎟⎜ ⎟+ + +⎝ ⎠       (7) To determine the constituents of time duration of the delivery it is recommended to use well-known methods and techniques. Conclusion. Obtained dependences for the definition of FUTT allow to use more widely in practice, the method of forecasting the transport   phase of harvesting technology, which is based on the criterion of priority transport service of timber consumers – FUTT. References 1. Насковец, М. Т. Обеспечение своевре-менной доставки древесины потребителям / М. Т. Насковец, Р. О. Короленя // Труды БГТУ. Сер. II, Лесная и деревообраб. пром-сть. – 2008. – Вып. XVI. – С. 61–64. 2. Насковец, М. Т. Организация вывозки древесного сырья с использованием функции срочности перевозки древесины / М. Т. Нас-ковец, Р. О. Короленя // Труды БГТУ. Сер. II, Лесная и деревообраб. пром-сть. – 2009. – Вып. XVII. – С. 71–75. 3. Гаджинский, А. М. Основы логистики: учеб. пособие. / А. М. Гаджинский; ИВЦ «Мар-кетинг». – М., 1996. – 124 с. 4. Модели и методы теории логистики: учеб. пособие. – 2-е изд. / В. С. Лукинский  [и др.]; под ред. В. С. Лукинского. – СПб.: Пи-тер, 2007. – 448 с. 5. Мешкова, Л. Л., Логистика в сфере мате-риальных услуг (На примере снабженческо-заготовительных и транспортных услуг): моно-графия. – 2-е изд., испр. и перераб. / Л. Л. Меш-кова, И. И. Белоус, Н. М. Фролов. – Тамбов: Тамб. гос. техн. ун-т, 2002. – 188 с. Received 14.03.2012 

Determination of the urgency of timber transportation using basic schemes of transportation process organization

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Determination of the urgency of timber transportation using basic schemes of transportation process organization

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