Numerical assessment of dynamic stresses arising during emergency braking in the lift car lifting and lowering system
Keywords:
elevator, car, emergency braking, dynamic stress, inertial force, steel rope, safety device, finite element method, transient analysis, structural safetyAbstract
The article considers the assessment of dynamic stresses arising in the elements of an elevator lifting and lowering system during emergency braking of the elevator car using numerical methods. The interaction of the car, counterweight, steel ropes, traction sheave, guide rails, and safety device was analyzed using a simplified dynamic model. It was shown that, due to the sharp increase in inertial forces over a short time interval during an emergency stop, static analysis alone may not fully represent the actual structural condition. In the sample calculation, the braking acceleration, inertial force, rope tension, and stresses in structural elements were evaluated for an elevator car with a rated load capacity of 1000 kg. The combined application of the finite element method, modal analysis, and transient dynamic analysis was shown to provide an opportunity to identify critical zones and improve structural safety.
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