This thesis describes a research on advanced ride control for a high speed
passenger lift system. The aim of the research is to design a strategy that would
improve the ride quality in a lift. The research starts from a basic level that involves
extensive work on modelling a high speed passenger lift system to create a
mathematical model that would predict the mechanical rigid body modes of the
system. A lift system consists of both electrical and mechanical elements. The
electrical part of the system involves an electrical motor operating in closed-loop
velocity control. The mechanical part of the system is made up of masses, ropes and
pulleys. The dynamics of a lift system are time-variant and depend on the position
of the lift within the shaft and the number of passengers on board. This poses further
complications for the mathematical modelling and the design of the control system.
Experimental work was conducted on the physical system to verify the mathematical
model. Various unknown parameters (e.g. damping factors) were obtained from
the test data, and also information on the sources and magnitude of the random
disturbance on the lift car. [Continues.]
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.
Great Britain, Government (Overseas Research Scholarship).