scholarly journals Structural construction of technological processes of logging operations

Author(s):  
В.Д. Валяжонков ◽  
С.А. Демидов ◽  
Н.Л. Фам

Целью данной статьи является структуризация цикла технологических процессов лесосечных работ, дающая возможность вскрыть пути совершенствования использования способов и средств технологического обеспечения. В качестве объектов исследования приняты элементы структуры технологического цикла трелевки древесины колесным сортиментоподборщиком. В настоящее время при анализе циклов технологического процесса (ТП) лесосечных работ с целью оценки эффективности их использования применяется двухуровневая структура. Рассмотрению подвергаются элементы цикла только на его входе и выходе. Внутренняя структура цикла остается без внимания. На основании анализа циклов технологических процессов, выполняемых многооперационными лесными машинами, была установлена необходимость построения их структуры в четырехуровневом исполнении. Представлена структурная схема технологического цикла трелевки древесины колесным сортиментоподборщиком. Она отражает строение и внутреннюю форму организации технологических процессов лесосечных работ как единство устойчивых взаимосвязей между ее элементами. В четырехуровневой структуре ТП лесосечных работ первым уровнем развития является цикл, занимающий вершину структуры, вторым – фазы и третьим – стадии. Основанием структуры является четвертый уровень – рабочие и вспомогательные операции. Многоуровневая структура позволяет вскрыть пути совершенствования технологических процессов на всех этапах развития цикла. Данный подход дает возможность выявить наиболее эффективную реализацию потенциальных возможностей способов и средств технологического обеспечения. Результаты статьи рекомендуется для совершенствования технологических процессов лесосечных работ с целью повышения их эффективности как на стадии их разработки, так и в период эксплуатации многооперационных лесных машин. The purpose of this article is the structuring of a cycle of a technological process of logging operations, enabling them to find ways to improve the use of methods and means of technological support. The elements of the structure of the technological cycle of dragging by a wheeled wood assortment pick-up are taken as the object of research. Currently, the analysis of cycles of a technological process (TP) of logging operations to assess the efficiency of their use a two-level structure is applied. The elements of the cycle only on its input and output are considered. The internal structure of the cycle is left unattended. Considering the analysis of the cycles of multi-stage processes performed by forest machinery, it is necessary to build their structure in a four-level performance. The structural scheme of a technological cycle of logging by a wheeled wood assortment pick-up is given. It reflects the structure and the internal form of organization of technological processes of logging operations, as the unity of stable relationships between its elements. In a four-level structure of the TP of logging operations the first level of the development is a cycle that occupies the top of the structure, the second is phases and the third is stages. The base of the structure is the fourth level – working and supporting operations. The multilevel structure allows to discover ways to improve technological processes at all stages of the cycle. This approach makes it possible to identify the most effective implementation of potential possibilities of the ways and means of technological support. The results of the article are recommended for the improvement of technological processes of logging operations with the aim of increasing their effectiveness, both at the stage of their development, and during the operation of multifunction forest machines.

2020 ◽  
pp. 22-26
Author(s):  
E. M. Zimin ◽  
◽  
V. V. Martishkin ◽  

The article presents the list of singular indicators of technological support of technologies and the method of determining their actual values and their quality levels. According to the results of determining the quality level of technological processes, one of three management decisions can be made. The paper describes singular quality indicators that are directly related to the quality of technological processes in the machine-building industry, at the stage of design and preparation of technical documentation. And also presented are complex quality indicators, based on which determine the generalized indicator of quality of the evaluated technological process. As a result of the work the features of conformity assessment of technological processes and related mandatory requirements are formed. Also described is the process of obtaining a qualitative and quantitative assessment of the quality of the technological process with a detailed description of all necessary formulas


Author(s):  
С.А. Демидов ◽  
В.Д. Валяжонков

Как отмечают лесные специалисты, основным показателем, выражающим смену состояния технологического процесса лесосечных работ, является время. Необходимо иметь четкое и ясное представление о продолжительности и характере протекания времени каждого уровня цикла технологического процесса. Это создает возможности для совершенствования использования способов и средств обеспечения технологического процесса. Колесный сортиментоподборщик является многооперационной машиной, выполняющей технологический процесс с четырехуровневой структурой. Цель настоящей работы – создание системы ма- тематических моделей, отражающих продолжительность технологического цик- ла трелевки древесины колесным сортиментоподборщиком. На основании построения иерархической схемы структуры продолжительности технологического цикла трелевки колесным сортиментодборщиком разработаны математические модели времени цикла, фазы и стадии, которые определяется суммой времени. Созданный комплекс математических моделей является основой методики опре- деления продолжительности элементов всех уровней структуры и установления вероятности длительности их появления, вскрытия взаимосвязи между ними и поиска путей их минимизации, а также выявления оценки полезного использо- вания времени данных элементов. Принятая иерархическая схема структуры продолжительности цикла данного процесса имеет четыре ступени. Верхнюю ступень занимает цикл, вторую – фазы цикла, третью – стадии фаз и четвертую – операции. В основу идеи реализации рассматриваемого процесса должна быть заложена минимизация продолжительности в целом цикла и всех составляющих его элементов. Мотивом подхода является наибольшая зависимость производи- тельности машин, выполняющих процесс трелевки сортиментов от продолжительности цикла в сравнение со всеми влияющими факторами. Получение рациональных и, в лучшем случае, оптимальных значений производительности и технико-экономических показателей возможно при достижении минимальной продолжительности цикла технологического процесса лесосечных работ. According to the forest experts’ opinion the main indicator expressing the state change of the technological process of logging operations is time. It is necessary to have a clear and fair idea of the duration and the time characteristics of each level of a cycle of a technological process. This creates opportunities to improve the use of methods and means of the technological process. A wheeled wood assortment pick-up is a multifunction machine that performs a technological process with a four-level structure. The purpose of this article is to establish a system of mathematical models, reflecting the duration of the technological cycle of the wheeled wood assortment pick-up. On the basis of the creation of the hierarchical scheme structure of the duration of the technological cycle of the skidding wheeled wood assortment pick-up mathematical models of the cycle time, phases and stages, which is determined by the amount of time are developed. The accepted hierarchical scheme of the structure of duration of a cycle of this process has four stages. The first stage is occupied by a cycle, the phases of the cycle are the second stage, the third stage are the phase and the fourth one are the phases of operation. The idea of the realization of this process needs to be used to minimize the duration of the overall cycle and all its components. The motive of the approach is the greatest dependence of productivity of the machines carrying out the process of skidding of assortments from the cycle duration in comparison with all influencing factors. Getting rational and, in the best case, optimal values of productivity, technical and economic indicators is possible owing to achieving the minimum duration of the cycle of technological process of felling works.


2018 ◽  
pp. 48-51
Author(s):  
Sh.U. Yuldashev ◽  
D.T. Abdumuminova

The article provides an overview of the principle of the pump D630-90, as well as methods for studying the real conditions of technical support to improve maintainability and optimize technological processes and systems. A technological process for the restoration of the shaft of a centrifugal water pump has been developed and an algorithm for managing it has been proposed, on the basis of which the system for energy-efficient management of the recovery area has been implemented. Also in the article some questions of use, metal-filled compound SK812, and also application of ultrasonic processing of a surface of a shaft of the centrifugal water pump of mark D630-90 are mentioned and considered. The developed technological process of pump shaft restoration showed that it is characterized by simplicity, it fits well into the production process of repair and can be widely used in repair shops.


Author(s):  
Fu-qiang Chen ◽  
Zhi-xin Gao ◽  
Jin-yuan Qian ◽  
Zhi-jiang Jin

In this paper, a new high multi-stage pressure reducing valve (HMSPRV) is proposed. The main advantages include reducing noise and vibration, reducing energy consumption and dealing with complex conditions. As a new high pressure reducing valve, its flow characteristics need to be investigated. For that the valve opening has a great effect on steam flow, pressure reduction and energy consumption, thus different valve openings are taken as the research points to investigate the flow characteristics. The analysis is conducted from four aspects: pressure, velocity, temperature fields and energy consumption. The results show that valve opening has a great effect on flow characteristics. No matter for pressure, velocity or temperature field, the changing gradient mainly reflects at those throttling components for all valve openings. For energy consumption, in the study of turbulent dissipation rate, it can be found that the larger of valve opening, the larger of energy consumption. It can be concluded that the new high multi-stage pressure reducing valve works well under complex conditions. This study can provide technological support for achieving pressure regulation, and benefit the further research work on energy saving and multi-stage design of pressure reducing devices.


Author(s):  
Yaroslav Kusyi ◽  
◽  
Oleh Lychak ◽  
Volodymyr Topilnytskyy ◽  
Miroslav Bošanský ◽  
...  

The rational design of technological processes of parts manufacturing in single and small-scale production is inefficient without wide introduction of modern tools of part manufacturing automation with modern computer-based equipment and software. It is desirable to carry out of automated synthesis of single route technological processes with minimal influence of the operator on the technological environment. The technology of computer-aided design of technological processes is used to develop effective algorithms of functioning of adapted systems for control of technological processes and their implementation when taking into account interrelations with the technological environment. Automated development of technological environments of a given level of design concerning a dedicated technical system is possible on the basis of their rational functional models, created by means of CALS-technologies. The rational use of the SADT methodology with application of the principle of decomposition and development of the SADT-diagrams allows to solve the given technical problems. Therefore, the purpose of this paper is to develop and study the vibrational-centrifugal surface strengthening at the finishing and hardening technological operation to provide the required quality parameters and operational characteristics of the parts. The object of this research is a finishing and hardening technological operation. The subject of this research is method and parameters of vibrational-centrifugal surface strengthening to provide the required quality parameters and operational characteristics of the parts. The development of SADT diagrams allows to divide the technological process to technological operations, cutter–setting positions, technological steps, main machining steps etc. In this paper the principles of control of technological operation for vibration-centrifugal strengthening of surfaces of parts are suggested. The experimental device for machining of inner surfaces of parts is described. The initial and detailed model of the operation of the vibrational-centrifugal strengthening is offered. Statistical and structural analysis of technological process made it possible to establish the influence of the parameters of the vibrational-centrifugal strengthening on the geometric and physical-mechanical parameters of the surface quality and associated operational characteristics. Further research in that field will be related on the development of practical recommendations for using of the vibrational-centrifugal surface treatment for improving of the geometric and physical and mechanical parameters of parts surfaces.


2019 ◽  
pp. 114-119
Author(s):  
Valeriy V. Piven ◽  
Vladislav S. Shchelkonogov

Assessment of the quality of separation of hydrocarbon raw during its field preparation is necessary to determine the efficiency of the entire technological process of preparation. The absence of complex criteria for assessing the quality of separation for multi-stage processes does not allow one to obtain unambiguous solutions in justifying the process flow diagrams and equipment for separation. We have analyzed the typical technological scheme of separation of hydrocarbon raw materials and existing criteria for separation processes. It is proposed to use the criterion for a comprehensive assessment of the separation processes of hydrocarbon raw materials, allowing calculating the efficiency of the process, taking into account the possible production of intermediate fractions and their qualitative composition


2021 ◽  
pp. 68-71
Author(s):  

The use of mathematical models is of great importance for the automation of the design of technological processes. Representation of the geometric parameters of the part in the form of mathematical models allows automating the development of the structure and calculation of the parameters of the technological process, which is important for the complete digitalization of the technological preparation of production. Keywords: technological process, design, mathematical model, digitalization. [email protected]


2020 ◽  
pp. 6-9
Author(s):  
I.A. Tarasova

The article provides information about the impact of technological processes on the consumer properties of macaroni products; the recommendations on the technological process for obtaining macaroni products with the best consumer properties are given.


2013 ◽  
Vol 634-638 ◽  
pp. 1855-1858
Author(s):  
Shuo Ming Wang ◽  
Jian Xing Wang ◽  
Ju Gao

The research about the macro-inclusions of three processes: BOF→ LF→ CC, BOF→ RH→ CC and BOF→ LF→ RH→ CC, shows that: The types of inclusion are SiO2-Al2O3-CaO-TiO2-MnO, SiO2 and SiO2-Al2O3. The content of SiO2-Al2O3- CaO-TiO2-MnO in the three processes are 34.2%、23.5% and 27%; The content of SiO2 are 24.4%、47% and 27%; The content of SiO2-Al2O3 are 26.8%、17.6% and 9%. Large inclusion>300μm takes up 69.8%~85% of the total inclusion in billet in three technological processes, and the inclusion, containing K and Na, is the most; slag entrapment in mould is really serious. Considering the cleanliness and cost, the better technological process of MRT3-BA stamping steel is BOF→ RH→ CC.


2018 ◽  
Vol 196 ◽  
pp. 04067
Author(s):  
Evgeniy Kudryavtsev

The article describes the procedure automation of optimization discrete technological processes with using of Bellman’s functional (recurrent) equation and system Mathcad. As rule the technological processes includes n of operations and each operation can be executed by various types of equipment. Expenses (cost, time, …) on execution of i operation by k equipment after execution by j equipment (i-1) operation are known - c (i, j, k). Expenses for execution by k equipment i operation can depend on the equipment - j, which executed previous (i-1) operation. It is necessary to execute automation of optimization technological process with the minimum expenses. The algorithm of the decision of a problem by Bellman’s method includes two phases. The first phase is calculations of the minimum expenses for execution of all partial technological processes, from last operation of process to the first. The second phase is definition of the required optimum set of equipment which is carrying out all technological process with the minimum expenses. The proposed procedure of automation of optimization technological process using Bellman’s method and system Mathcad significantly decreases time and labour costs on execution of such calculations and efficiently to execute investigations related with change of equipment parameters.


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