Car acceleration during buffering process of lifts

Industrial hydraulic buffers seem to be standard equipment for industrial machinery. They are used for the limitation of car accelerations and the reduction of impact loads on structures during processes of kinetic energy reduction. This is realized by a controlled buffer force acting along the stroke of the buffer. The product of buffer force and stroke results in the energy dissipated during a buffering process. The controlled and restricted buffer force is a result of the load mass, the load speed and the buffer stroke chosen. In order to gain a suitable buffer capacity the maximum values of mass and speed are considered first. Nevertheless the consideration of less mass and/or less speed may be relevant. Lower loads lead to higher accelerations especially. These accelerations have to meet the requirements of standards as EN 81-20 and of comfort. The contribution shows the effects at a certain lift example on basis of simulation. The buffer designs under consideration of full load and partial load are considered in comparison in order to find a suitable system set up.