Methodological and computer-based support for choosing underground utility networks renovation method

The article is devoted to the methodological and software tools for choosing organizational and technological solutions to maintain sewage collectors in an operable state to increase their service life. Such a tool must take into account a set of factors that affect the operation of sewer collectors and form a system, the implementation of which would improve the existing principles of monitoring the status of sewer collectors, identify effective organization and technological solutions of their renovation by taking into account factors that affect their safe operation, the facilities risk of accidents categories, conditions and parameters of works performance. For determining the optimal options for the renovation of the sewer collector using the developed mathematical and computer models, the results of problems solving were generalized: one-criterion optimization subject to the choice of one repair method; one-criterion optimization subject to the choice of different repair methods for the areas; multicriterion optimization.

EXPERIMENT PLAN FOR RESEARCHES OF POLISHING PROCESS OF OPTICAL DETAILS / OPTINIŲ DETALIŲ POLIRAVIMO PROCESO EKSPERIMENTINIO TYRIMO PLANAVIMAS

Descriptions of polishing process, using technologies, materials of optical details are given in this article. High quality requirements are raising for optical details – smoothness of surface, non-existence of effects, form deflections, which are obtainable in polishing process. Results of modelling and experimental data are given in published scientist researches; various cutting rates were used in polishing process. Experiment plan for polishing plane details from optical glass BK7 with different cutting rates is given in this article. Multicriterion optimization in polishing process using for high quality optical details. Straipsnyje aprašomas optinių detalių poliravimo procesas, naudojamosios technologijos ir medžiagos. Optinėms detalėms keliami aukšti tikslumo reikalavimai – paviršiaus glotnumo, defektų nebuvimo, formos nuokrypių ir kt., jie gau­nami poliravimo proceso metu. Mokslininkų paskelbtuose tyrimuose pateikiami modeliavimo rezultatai, gauti eksperimentų metu, tirtos įvairios apdirbamosios medžiagos, jų paviršiaus kokybė, poliruota įvairiais pjovimo režimais. Šiame straipsnyje aprašomas eksperimento planas, skirtas plokščioms detalėms iš optinio stiklo BK7 poliruoti, kai varijuojama keliais apdirbimo režimais. Siekiama gauti aukštą gaminių kokybę daugiakriterio optimizavimo būdu.

Multicriterion Optimization of Power Sites Location on the Watercourse

In this article we have explored the issue of optimization of HPP site location in a cascade depending on social-economic, environmental and energy limitations taking into account available cadastre of water power resources. A multicriterion problem of optimization on the network was formulated. Pareto optimal solution of this problem was obtained by means of the developed mathematical model of optimization of the HPP site location in the cascade. The optimization algorithm to solve this problem has been developed