International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Maintaining a high level of reliability of service equipment in agricultural machinery repair facilities requires the use of modern methods and technologies for service. For their application, it is necessary to study the failures of equipment by causes of occurrence. This research paper justifies the need to create stocks of spare parts, assemblies and units and analyzes their influence on the availability coefficient of machines, i.e. economic feasibility.

The parameters of an agricultural machinery workshop with an unlimited incoming flow of repair-service requests have been studied. As a result of each research experiment and the obtained change values of the calculated service parameters, the character of their change depending on the number of channels serving the tractors was calculated. The change values of the calculated parameters depending on the number of service channels are reflected in a table and graphically presented.

With the help of the parameters characterizing the work of the service for mobile equipment, a quantitative assessment of its activity can be made. Therefore, their knowledge and determination are of particular importance. In order to optimize the parameters of the service, we formalize its operation as a mass service system (MSS).
In the stationary state of the service, the formulas for determining its individual parameters are derived.

In order to obtain the methods of assessing the quality of the functioning of the motor transport company, it is necessary to develop a methodology for quantitative evaluation of this quality. This methodology should be based on mathematical models of the quality of operations of the motor transport firm.
For purposeful formation of quality, the paper proposes an adequate method of analysis of this quality. At the same time, a method of evaluating the quality of the functioning of the automobile enterprise, evaluating the quality of the decisions taken to improve this property, and forecasting the expected quality of the functioning have been developed.

Customer satisfaction is a priority for any business that wants to be successful over a long period of time. Feedback from customers who share their opinion about the products and services offered by the company gives a complete picture that can be used for precise planning, statistics and implementation of new aspects in the service. The purpose of this article is to present some techniques for processing data obtained from customer feedback.

The study of the formation process of the operation quality of a transport firm is the most topical, since this process significantly determines the dynamics of its evolution. The paper presents the concept of the product and service quality, describes the difference between the service and the product, as well as a step-by-step scheme of quality development. The history of quality management development is also discussed on the example of three leading regions of the world: USA, Japan and Western Europe.
Methods for assessing the quality of products and services have been established, which are somewhat different from each other and are of great importance for assessing the activities of a transport enterprise.

The article explored the operational reliability of agricultural machinery of low mechanization operating in the mountain conditions of Ajara, carried out the classification of machine parts on the basis of their structural and technological homogeneity and specific working conditions, highlighted the least reliable components and parts, developed a theoretical basis for calculating the reliability in contrast to mobile machines , the corresponding structural and logical schemes were drawn up.
As a result of statistical studies, integral and differential distribution functions of reliability indicators have been obtained, their general characteristics have been determined and the values of single and complex reliability indicators have been determined, resource-saving technology has been developed to increase the reliability and resource of mini-technology. technology for the region of Adjara, as well as its parameters and rational about service-organization of the pilot plant.

The system of the servicing of the machines in the livestock farms has been analyzed and the necessity of optimizing the spare parts services and the scope of the workshops for maintaining the equipment in the livestock breeding. Relations have been developed to optimize the area to be serviced by the workshop and its spare parts warehouse, as well as the optimal average distance to be found from where machines work.

In the last decade in Republic of Macedonia and the Balkan region, the import and use of modern agricultural machines and equipment has been intensive.

Some makes and models are manufactured by well known brands ,there is also imports of generic construction via a fast manufacturing process.

The trend of developing and perfecting of both is a complex process, and it is rare to find an exclusive distributor. Usually the dealerships do not pay attention to servicing and overhaul or instructions on proper handling during usage.

Because of the wide selection of brands that have been imported, the issues with servicing and overhaul are not resolved on state or regional level which causes problems, delays and expenses during the life span of the machines.

Until now there has not been a strategy made for overhaul centers.

Анализирано е влиянието на параметрите на законите на разпределение на отработката до отказ (ресурса) на елементите върху параметъра и характеристиката на потока на отказите за рекурентен поток със закъснение и за общ поток на отказите и са установени областите на тяхното влияние На тази база е предложен е общ непараметричен подход за определяне на параметъра и характеристиката на потока на отказите на елементите на машините при рекурентен поток, рекурентен поток със закъснение и общ рекурентен поток и основан на него метод за определяне на необходимите резервни елементи за поддържане на работоспособността на самоходна земеделска техника .

Направен е анализ на състоянието на тракторния парк в страната, условията за поддържането му в работоспособно състояние и нормативната база за оценка на риска в ремонтнообслужващите дейности, Предложен е методически подход за оценка на риска при техническо обслужване и ремонт на трактори, отчитащ многообразието от форми и дейности извършвани при този вид работи.

Производствените процеси в растениевъдството се осъществяват при взаимодействието между организационно свързани съвкупности от мобилни, стационарни и обслужващи единици. Ефективното използуване на скъпоструващата и високопроизводителна прибираща техника е пряко свързано със синхронизацията на работата им .

В разработката е предложен математически модел за оптимизиране на взаимодействието между производсвените и обслужващите машини в съвместната им работа при прибиране на зърнено-житни култури.

За оптимизация на съотношението между основните и обслужващи машини е използван критерият минимум на загубите от престои.