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1 Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje
1 Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2 2000

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Metoda szacowania kosztów zawodności pompowni wodociągowych

Bajer J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2000

z. 32[180], cz.2

9-17

Calculation of the economic efficiency of an investment considering the estimated cost of losses connected with unreliability of modern pumping stations should be used as the crite- rion for finding the optimal solution in their design. The cost connected with the use of pumping stations depends on random limitations in water supply. In view of the probabilistic character of losses (failures of pump units or fittings, cuts off in electric energy supplies) the estimation of the cost of unreliability at the stage of pumping station design is not easy. The paper presents the method which aims to estimate the predicted annual cost of the potable water pumping station unreliability as the function of station readiness (assumed as a criterion of reliability) and the economic equivalent of unsupplied water (the expected cost of losses per unit of unsupplied water volume). This method enables us to consider, while calculating the efficiency of an investment, reliability parameters which often condition the choice of the optimal design. The proposed method may be used in designing municipal and industrial pumping stations. First of all, however, it can be applied to the estimation of costs of unreliability of pumping stations which supply water to industrial enterprises of major economic impact.

An intelligent cylindrical grinding machine

Leżański P., Lajmert P.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

2000

Vol. 76, nr 35

117-125

Presents an intelligent flexible, sensor based system which ensues reliable process state monitoring and control for application in cylindrical grinding which is being developed at the Technical University of Lodz. The functions and structure of such a system are discussed and next the general structure of the system is presented. This is a hierarchical control system. A monitoring subsystem and a servo control module are at the lowest level of the system. The higher level is a diagnostic subsystem and adaptive control module. The diagnostic system generates data for adaptive control and, independently of the AC system makes decision about tool regeneration, a change of process limitation or failure stoppage of the process. The third and highest level of the system performs the global optimization of the process which determines machining performance, initial machining parameters and algorithms for the lower system levels. The last section of the paper presents the hardware setup of the system.