| Abstract [eng] |
Šaškevičius R. Research of the passenger lifts renovation problems: Master thesis of energetic research advisor Assoc. doc. T. Šimkevičius; Šiauliai University, Technological Faculty, Electrical Engineering Department.- Šiauliai, 2007. – 110 p. SUMMARY The theme of Master thesis of Electrical engineering is actual because the passengers don’t feel safe when using passenger lifts in present time. The exploitation time of passenger lifts is very long, all parts are wasted. Due to these problems the passenger lifts are not safe to use longer. A passenger lift is designed to move people between a building's floors. This apparent simplicity belies a complex and sophisticated mechanical, electrical and microelectronic system. The present work deals with the risk analysis, with particular reference to lift systems. Lifts are characterized as being extremely safe. Their safety record of moving hundreds of passengers every day, with extremely low rate of incident, is unsurpassed by any other vehicle system, although fatalities due to malfunction have been known to occur on occasion. A certain number of passengers do die every year in lift related incidents. The main steps of the risk analysis process have to be very considered. Some methods we are using in this project, is applied for the identification of the failure modes while their failure occurrences are combined by means of fault tree analysis. The applications proposed are taken from the field of lift system and are referred to an escalator and to a lift. The main data introduced in the models have been supplied by escalators and lifts manufactures. The application of risk analysis procedures, as described in this thesis, represents the basis for the evaluation of the safety level of a system and for the identification of necessary improvements. |
