This paper proposes a procedure for obtaining the load distribution in a four contact-point slewing bearing considering the effect of the structure’s elasticity. The uneven stiffness of the rings and the supporting structures creates a variation with respect to the results obtained with a rigid model. It is necessary to evaluate the effect of the elasticity on the increase in the contact forces in order to be able to design the slewing bearing and the structures involved in the connection. Depending on the shape of the structures, the contact force value obtained on the most loaded rolling element is different. The evaluation of this maximum force at extreme loads is essential to design the structures joined to the bearing rings. The new elastic model presented in this paper is highly nonlinear so iterative loops are needed in order to obtain a satisfactory solution. At the same time a finite element model (FEM) has been created for the global model, having also represented the rolling elements and their contact with the raceways. The results obtained using the FEM have been correlated with the results of the new procedure.
As comfort has become an important factor in the lift industry, validated lift models are currently a significant research area. In this article, we present an analysis of a lift guiding system, which transmits vibrations to the cabin and affects passengers' comfort. The project consisted of determining the most important lift guiding system factors that affect a lift's comfort. The Design of Experiments technique was chosen as the best technique available to maximize the information gathered from the experiments. In order to carry out the experiments, a lift test rig was specially constructed in order to simulate a real installation. We screened and analyzed the influence of many factors on the response with an adapted factorial fractional design. This article shows the steps carried out in planning and analyzing the experiments, putting special emphasis on the planning during every phase of the DoE application. This research project was co-developed by a research center, a university and a well-known Spanish lift company.
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