AN EVALUATION APPROACH FOR ELIMINATING THE FAILURE EFFECT IN GAS TURBINE USING FUZZY MULTIPLE CRITERIA

This paper demonstrated the fuzzy AHP combined with fuzzy VIKOR technique integrated with essentials of weight in order to overcome the risk evaluation process of the uncertainty in subjective perception and experience of human. Gas turbine has considerably expanded its role in several areas subsequent to the improvement in high efficiency and clean energy such as aviation and marine propulsion systems, electric power stations, and natural gas and petroleum transportation. However, the cost of various industrial plants and their relevant maintenance appear to be extremely expensive to be operated by these gas turbines. This paper aimed to cope with the essential elements of gas turbine including hydraulic-pneumatic equipment, electronic control equipment, and bearing equipment. The results have proved the bearing equipment to have been the most effected alternative, as being ensued by hydraulic-pneumatic equipment and electronic control equipment.

METHOD OF RELIABILITY IMPROVEMENT OF AIR-TO-SURFACE MISSILES CONTROL EQUIPMENT

The article analyzes the current state of the fleet of guided air means of destruction (missiles), the problems of repair and extension of the resource. The article substantiates the need for the transition of guided air missile of the "air-to-surface" class to operation according to the technical condition. The shortcomings of the existing inspection system for the technical condition of guided air weapon are shown. For the existing inspection system of technical operation of guided air weapon, one of the areas that will solve the problem of maintaining the combat readiness of aircraft is the transition to the operation of guided air weapon in technical condition. It is shown that the transition of guided air missiles to operation according to the technical condition and modernization of unguided air missiles involves strengthening the role of operations to measure and control their parameters and characteristics in order to determine the actual technical condition and make informed decisions about their further operation. Peculiarities of appearance of the Type 1 and Type 2 errors during control of a technical condition of aviation armament are presented. A method of increasing the reliability of air-to-surface missile control equipment by conducting control checks in the inter-check interval is proposed. The fundamental difference between the proposed information-redundant model of operation of guided air missiles and the classic model is the introduction into the system of operation a new diagnostic operation - an intermediate control check. Peculiarities of application of the developed method concerning calculation of both quantity of control checks and their periodicity within an inter-check interval are shown.

Mathematical modeling of work processes in the control equipment of the hydropulse drive

Проблематика. Интенсификация различных технологических процессов в промышленности и строительстве требует применения перспективных технологий – вибрационное и виброударное технологическое оборудование. Эффективные режимы работы гидравлических вибрационных (ВМ) и виброударных машин (ВУМ) определяет специальная управляющая аппаратура – генераторы импульсов давления (ГИТ). Для исследования режимов работы ВМ и ВУМ при разных технологических параметрах разработана и исследована математическая модель гидроимпульсного привода (ГИП). Цель. Целью работы является повышение эффективности работы ВМ и ВУМ посредством определения оптимальных режимов налаживания работы управляющей аппаратуры ГИП на основе разработанной математической модели. Методика реализации. Исследование проведено с применением теории интегральных и дифференциальных уравнений; экспериментальные исследования и методы имитационного моделирования для проверки адекватности моделей, аналитических и численных алгебраических методов, решения аппарата дифференциальных уравнений с частными производными для реализации моделей изучаемых процессов и получения их числовых характеристик. Результаты. Разработана методика автоматизированного математического моделирования рабочих процессов в управляющей аппаратуре ГИП вибрационных и ВУМ. Усовершенствованы математические модели динамики работы ГИП на базе двухкаскадных клапанов-пульсаторов, в форме пространственно-нестационарной постановки задачи и интегральных уравнений динамических характеристик подвижных элементов привода. Выводы. Предложен современный высокоэффективный ГИП с управляющей аппаратурой на базе двухкаскадного клапана-пульсатора. Определены особенности работы ГИП для ВМ и ВУМ на основе анализа разработанной математической модели. Предложены оптимальные режимы работы ГИП для обеспечения эффективного режима работы ВМ и ВУМ.

Normalization of assembly technical process of the frame of power and control equipment for nuclear power plants by the method of simulation

Objectives. The modern world is associated with a clear dependence on it. The number of consumers is growing exponentially. In order to minimize the costs of enterprises, an assumption was made about the rationality of the number of nuclear power plants. When considering the timing of the construction of nuclear complexes, an excessive duration of the manufacture of power and control equipment for nuclear power plants was revealed. In order to reduce time costs, it was proposed to standardize the work of assembly, assembly and packaging production associations.Method. Research in this area was practically not carried out and were, often, of an episodic nature. Initially, it was believed that the operations of the technological process of manufacturing equipment should be rationalized by classical methods, however, in the previous works of the author, a new approach was proposed, based on the analysis of the characteristics of the employee employed in the technical process, the specifics of the type of operational work, as well as various disturbing factors that negatively affect the production time. Then the systematization of the obtained data and their further modeling is carried out. Results. The paper shows the derivation of the final equation for the assembly of the frame of power and control equipment for nuclear power plants. The substantiation of the applied methods was given, the target audience was indicated, the regulatory framework was taken into account. In addition, the results of previous works are shown, on the basis of which the mathematical model was built. Separately, recommendations were given on the additional use of the functions of the resulting equation.Conclusion. The equation obtained in the work makes it possible to calculate with maximum accuracy the time spent on assembling the frame of the power and control equipment for a nuclear power plant. The principles shown in other works can be used in an area that has directionality with minimal model change.