The systems analysis and design of lifts (elevators): the models and assumptions appraised

With modern computer systems equipped with relevant software tools / programs to automate the calculations, the systems analysis and design of lifts appears to be relatively straightforward. However, thorough understanding of engineering principles and models applied is of paramount importance in conducting the system calculations. This is critical in correct understanding of the assumptions applied in the safety standard formulae and requirements. In this context the importance of application of design / structural integrity criteria associated with the worstcase scenario dynamic conditions, to achieve a system which complies with accepted safety code requirements, is discussed and appraised. The paper demonstrates this through practical examples involving traction-drive systems designed to operate across a range of system design parameters.