No abstract

Auxiliary machinery is used at the open-pit coal mine (machines: bulldozers, trench excavators, pipe-laying machines,....) for performance of auxiliary work (excavation, construction of route,....) in order to provide an uninterrupted operation of the basic machinery for excavation of waste rock and coal. Machines are moving from one area of the open-pit to another. Movement of machines along the open-pit is limited space-wise by conveyor belts serving for conveyance of waste rocks and coal, including other natural obstructions (steep slopes, mud, water). These obstructions affect the open-pit machines’ length of trajectory, duration of movement and consumption of fuel. Observing the said problem, a model for optimizing the “movement” of open-pit auxiliary machinery has been developed and applied with ICT, namely GPS/GPRS and appropriate software solution, as presented herein. Model determines the „shortest“ path of the machine to the job which can result in significant fuel savings and reducing failures machines.

With the aim of management improvement, availability and readiness increase and decrease in costs of the exploitation system (operative work and maintenance) of vehicles and operative machines at the open-pit coal mine, the modern business process access with the support of information system and technology was developed and applied (IS/IT). In the operation, the process of exploitation system with the respective software support and Reports development is displayed. IS/IT are designed regarding business processes, monitoring, analysis and management (planning, organizing, management and control) of the exploitation system

Auxiliary machinery is used at the open-pit coal mine (machines: bulldozers, trench excavators, pipe-laying machines,...) for performance of auxiliary work (excavation, construction of route, ....) in order to provide an uninterrupted operation of the basic machinery for excavation of waste rock and coal. Machines are moving from one area of the open-pit to another. Movement of machines along the open-pit is limited space-wise by conveyor belts serving for conveyance of waste rocks and coal, including other natural obstructions (steep slopes, mud, water). These obstructions affect the open-pit machines' length of trajectory, duration of movement and consumption of fuel. Observing the said problem, a model for optimizing the "movement" of open-pit auxiliary machinery has been developed and applied with ICT, namely GPS/GPRS and appropriate software solution, as presented herein. Model determines the "shortest" path of the machine to the job which can result in significant fuel savings and reducing failures of machines.

Modern mechanical systems are required to have high reliability characteristics. To attain them, it is necessary to take particular care (aside from laboratory and in service reliability examinations) of reliability design from the early development stages of a mechanical system. Reliability design for a new system includes an allocation of reliability to system elements which should meet specified requirements. In order to meet certain technical and economic system requirements, a method has been developed using Lagrange multipliers to determine "the best" reliability allocation from the basis of achieving minimum system cost (CSmin) for a specified system reliability (RS). In addition, this method offers the possibility of achieving maximum system reliability (Rmax) for a specified system cost (CS). This paper presents a reliability allocation method allowing the techno-economic requirements imposed on the system to be satisfied in an appropriate way. The method was developed considering some specific factors in the construction of mechanical systems and the relationship between system cost and reliability. In addition, a procedure was developed which permits the determination of "the best" reliability allocation using the multi-criteria ranking method and compromise programming, where system cost and reliability represent the criteria for choosing "the best" solution. The described allocation model was employed in the reliability allocation for an automotive gearbox.