July 6, 2006
Dr. Weidong Zhu presents at ELEVCON 2006 in Helsinki, Finland
Dr. Weidong Zhu, Professor of Mechanical Engineering at UMBC, presented at ELEVCON 2006, The 16th International Congress on Vertical Transportation Technologies.
The conference was organized by the International Association of Elevator Engineers (IAEE). It addresses technical issues related to destinational control, miniaturization, and ride quality of elevator systems. It was attended by engineers and managers from the elevator industry as well as academics doing research on elevator systems. The conference provides a forum for exchanging technical information on vertical transportation technologies.
Please continue reading below for more information about Dr. Zhu's research and presentation at this important conference.
Title of the poster:
Damped, Forced Lateral Responses of Cable-Car Systems in High-Speed Elevators
Abstract of the poster:
Control of the lateral vibration of cable-car systems in high-speed
elevators subjected to external excitations, such as pulley eccentricity, guide rail irregularity, and building sway, is studied in this paper. The controller is a point-wise, linear, viscous damper contacting the hoist cable, and the hoist cable is modeled as a tensioned beam with variable length, with and without natural damping. Both rigid and flexible suspensions of the elevator car against the guide rails are considered, and the car is modeled as a rigid body in the former and a lumped mass in the latter. Different mounting schemes of the damper are discussed and their control effects are compared. Special transformations are used to calculate the uncontrolled and controlled, forced responses and vibratory
energies. Based on the simulation results, guidelines to optimize the
damper design in terms of vibratory energies are indicated.
Summary of our research as it relates to the focus of the conference:
We developed new methods to analyze the dynamic response of elevator
systems, which involve suspension cables with variable length. We
explained for the first time the unstable shortening cable behavior
encountered in the elevator industry and developed new methods to suppress the vibration of elevator systems. The results can be used to optimize the design of high-speed elevators and imporve the ride quality of elevator systems.
Dr. Zhu's research relates to the focus on ride quality of elevators.