Abstract
The design process of new products in lift engineering is a difficult task due to, mainly, the complexity and slenderness of the lift system, demanding a predictive tool for the lift mechanics. A mechanical ad-hoc discrete simulator, as an alternative to ‘general purpose’ mechanical simulators is proposed. Firstly, the synthesis and experimentation process that has led to establish a suitable model capable of simulating accurately the response of the electromechanical lift is discussed. Then, the equations of motion are derived. The model comprises a discrete system of 5 vertically displaceable masses (car, counterweight, car frame, passengers/loads and lift drive), an inertial mass of the assembly tension pulley-rotor shaft which can rotate about the machine axis and 6 mechanical connectors with 1:1 suspension layout. The model is extended to any n:1 roping lift by setting 6 equivalent mechanical components (suspension systems for car and counterweight, lift drive silent blocks, tension pulley-lift drive stator and passengers/load equivalent spring-damper) by inductive inference from 1:1 and generalized 2:1 roping system. The application to simulate real elevator systems is proposed by numeric time integration of the governing equations using the Kutta-Meden algorithm and implemented in a computer program for ad-hoc elevator simulation called ElevaCAD.
Highlights
The analysis of the dynamic behavior of the elevator car system plays an important role in elevator engineering and superior ride quality of elevators is demanded nowadays
The use of general purpose software packages [2,3,4] is the unique alternative when elevator engineers need to simulate the dynamics of the elevator, at present, if an elevator test tower or any other facility for experimentation is not available
The basic assumptions on the elevator system dynamics are postulated in order to get a precise response in standard elevator trip and residential building elevators in a first stage
Summary
The analysis of the dynamic behavior of the elevator car system plays an important role in elevator engineering and superior ride quality of elevators is demanded nowadays. The sling is generally made by a number nR of tension equalized metallic ropes disposed in series, fixed to the car-frame by one end and to the counterweight by the other end.
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