Кандидат технических наук, доцент Кафедра процессов и оборудования перерабатывающих и пищевых производств им. проф. П. С. Берника Винницкий национальный аграрный университет ул. Солнечная, 3, г. Винница,
Описано математичну модель для визначення напружень, які виникають в грунті під впливом клина. Отримано залежності, за допомогою яких для різної глибини обробітку і показників міцності грунту в залежності від заданих параметрів якості проведення операцій можна визначити необхідний кут кришення. Отримані залежності дозволили визначити параметри динамічних систем, які сприяють зниженню їх енергоємності, підвищенню якісних показників роботи і створенню умов для підвищення продуктивності агрегатів Ключові слова: клин, грунт, метод варіаційного обчислення, пласт ґрунту, зрив, сколювання, зрушення, кришення, долото, чизельний робочий орган Описана математическая модель для определения напряжений, которые возникают в почве под воздействием клина. Получены зависимости, с помощью которых для разной глубины обработки и прочностных показателей почвы в зависимости от заданных параметров качества проведения операции можно определить необходимый угол крошения. Полученные зависимости позволили определить параметры динамических систем, которые способствуют снижению их энергоемкости, повышению качественных показателей работы и созданию условий для повышения производительности агрегатов Ключевые слова: клин, почва, метод вариационного исчисления, пласт почвы, срыв, скалывание, сдвиг, крошение, долото, чизельный рабочий орган
The object of research is hypoeutectic cast iron intended for cast parts operating under abrasive friction conditions. Such parts are mixer blades, the operational properties of which include durability, assessed by abrasion resistance and strength. To give the blades such properties, cast irons, which are materials of the blades, are alloyed with elements that contribute to the formation of carbides of various compositions. The main problem that impedes the targeted selection of materials for mixer blades or finished blades from different materials or different chemical composition is the lack of substantiated selection criteria. If the shipment is carried out only with the provision of data on the chemical composition of the alloy, it is necessary to be able to evaluate the expected mechanical properties, in particular abrasion resistance and strength. Using the methods of regression analysis, a mathematical model has been obtained that includes two regression equations, which allows for a targeted selection of the chemical composition that provides the maximum possible value of mechanical properties – ultimate strength and coefficient of wear resistance. Optimization of the chemical composition, carried out according to this model, made it possible to determine the following chemical composition: C=2.94 %, Ceq=3.3 %, Ti=1.56 %, providing the maximum ultimate strength σb=391 MPa; C=2.78 %, Ceq=3.14 %, Ti=1.61 %, providing a maximum wear resistance coefficient Kwr=12 %. In the case of priority of the strength criterion, the calculated optimal chemical composition makes it possible to reduce the mass-dimensional characteristics of the mixing units of the mixers. A procedure is proposed for using this model to select a batch of blades with the expected best performance properties
The article presents experimental verification of improving communicative training for future sports coaches in the context of neurophysiological patterns by expedient changes in pedagogical conditions, namely, forming a value attitude of students towards future professionally-oriented communicative activity; enhancing interactive learning methods; improving educational and methodical support; optimizing the subject-subject interaction of participants in the educational process in simulated situations of professional communication. The research aims to experimentally verify the above-mentioned pedagogical conditions and identify levels of indicators in future sports coaches’ preparedness for professionally oriented communicative activity. The research involved 105 students of the experimental group and 106 students of the control group, who voluntarily agreed to participate in the experiment. Research methods include the elaboration of the author’s didactic material, modelling of new pedagogical conditions and diagnostic methods. Diagnosis of levels of indicators in future sports coaches’ preparedness for professionally oriented communicative activity is carried out with the help of the diagnosed complex of both standard and adapted and modified or specially developed following criteria and indicators of the investigated phenomenon of author’s methods. After the formative experiment, the number of students with high and average levels of preparedness for professionally oriented communication activities has increased in EG (by 12.4% and 13.3%, respectively) and at the same time, the number of low-level students has decreased (by 25.7%). The results of the experimental work provide an opportunity to approve the effectiveness of the introduced pedagogical conditions of professionally-oriented communication training for future sports coaches.
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