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NEW TRENDS TO OPTIMIZE THE OPERATING PARAMETERS OF VERTICAL TRANSPORT INSTALLATIONS
Abstract
The acceleration and deceleration periods during each race of a vertical transport installation may be considered as periods of transitional processes where kinematics and dynamic measures variations take place (acceleration, speed and forces) as well as some electric measures (actuating motorпїЅs current). Considering T as the duration of the process, for the minimisation of the installed power, the minimisation of the energy dissipated in the system is imposed during the transitional period: ? ? ? ? ? ? T 2 1 0 W ? D ? i t dt ?min ! where i(t) is the intensity of the current absorbed by the actuating motor. According to the same considerations this integral is equivalent to: ? ? ? ? ? ? T 2 2 0 W ? D ? a t dt ?min ! where a(t) is the acceleration of the system, considered here as a command value. Mainly, in order to minimise the above integrals, values as small as possible need to be adopted for current i(t) as well as for acceleration a(t). On the other hand, if the acceleration drops drastically it may lead to exceeding the imposed value of process T, implying as well a compromising solution.
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