Fatigue Life Estimation of Elevator Car Frame with Double Floor by Stress Time History Simulation
Main Article Content
Abstract
The elevator car is an important load-carrying unit of the elevator, so any damage of car parts can cause unsafety for the user, especially for the passenger elevator. To eliminate the risks of insufficient strength, each elevator is inspected and tested with a load equal to 125% of its nominal load before being put into service. However, load testing in-situ can only detect damage related to the static strength, the fatigue hazards are difficult to be detected because fatigue accumulation occurs very slowly and depending on the stress time history. In practice, elevator structural elements are usually calculated in terms of its static strength, with a factor of safety taken higher than those of other structures without regard to fatigue strength. This paper presents the research results related to the calculation of fatigue life of the elevator car frame through simulated stress time history by numerical method. Our method shows that the fatigue life of the elevator car frame can be predicted in the design stage.
Keywords
Elevator car, stress time history, fatigue life
Article Details
References
[1] ASME A17.1-2007/CSA B44-07, Safety for Elevators and Escalators (2007).
[2] EN 81-20, Safety rules for the construction and installation of lifts - Lifts for the transport of persons and goods - Part 20: Passenger and goods passenger lifts (2014).
[3] EN 81-50, Safety rules for the construction and installation of lifts - Examinations and tests - Part 50: Design rules, calculations, examinations and tests of lift components (2015).
[4] Volkov D.P. et al., Lifts (in Russian), ACB, Moscow (1999).
[5] Janovsky L., Elevator mechanical design, Third Edition, Elevator World Inc. (2004).
[6] Chavushian N., Lifts and mining hoists (in Bulgarian), Technica Publisher, Sofia (1987).
[7] Yusuf Aytaç Onur and C. Erdem Imrak, Reliability analysis of elevator car frame using analytical and finite element methods, Building Serv. Eng. Res. Technol. 33(3) (2012).
[8] Trinh D.T. and Vuong V.T., Stress and deformation analysis of elevator car frame using numerical simulation method. Proceedings of the National Conference on Mechanics, December 8-9, 2012, Hanoi, Vol. 4 (2013).
[9] Trinh D.T. and Vuong V.T., Calculation of passenger elevator car frame with double floor by numerical simulation method. Proceedings of the National Conference on Mechanics – 35th Anniversary IMVAST, April 9, 2014, Hanoi, Vol. 1 (2014).
[2] EN 81-20, Safety rules for the construction and installation of lifts - Lifts for the transport of persons and goods - Part 20: Passenger and goods passenger lifts (2014).
[3] EN 81-50, Safety rules for the construction and installation of lifts - Examinations and tests - Part 50: Design rules, calculations, examinations and tests of lift components (2015).
[4] Volkov D.P. et al., Lifts (in Russian), ACB, Moscow (1999).
[5] Janovsky L., Elevator mechanical design, Third Edition, Elevator World Inc. (2004).
[6] Chavushian N., Lifts and mining hoists (in Bulgarian), Technica Publisher, Sofia (1987).
[7] Yusuf Aytaç Onur and C. Erdem Imrak, Reliability analysis of elevator car frame using analytical and finite element methods, Building Serv. Eng. Res. Technol. 33(3) (2012).
[8] Trinh D.T. and Vuong V.T., Stress and deformation analysis of elevator car frame using numerical simulation method. Proceedings of the National Conference on Mechanics, December 8-9, 2012, Hanoi, Vol. 4 (2013).
[9] Trinh D.T. and Vuong V.T., Calculation of passenger elevator car frame with double floor by numerical simulation method. Proceedings of the National Conference on Mechanics – 35th Anniversary IMVAST, April 9, 2014, Hanoi, Vol. 1 (2014).