Computational Analysis of Mechanism Operability

Abstract

This article deals with a way of interpretation the results of numerical simulations solved for the mechanism of lifting platform. Subject of analysis is the atypical design solution of lifting mechanism with one degree of freedom, which members are connected by revolute joints and linear sliding guidance. The mechanism movement is provided by linear hydromotors. Computational simulations are carried out by FEM, where linear coupling equations are used for modeling of revolute joints and linear sliding guidance is modeled by structural contact of rail and slider. The way of modeling and parameters setting of structural contact significantly affects the stability of numerical solutions and the obtained results. The authors assume that the interpretation of the observed behavior and results of the numerical simulations allow to deduce the mechanism operability and gives a clue for setting the gap of real bounds.

Influence of Manufacturing Process on Stress Distributions in Mechanical Parts

“…The practical use of the drum shows the rise of cracks in the welded connections of the flanges and drum shell. The high stress values causing the cracks initiation can be caused by the operational loading of the drum or/and by the stress resulting by the press fitting of the shaft and both flanges [1]. As this paper presents, very important role plays the manufacturing process (i.e.…”

Fatigue characteristics of welded high strength steel in the low cycle region of loading

“…Since, including all these factors in a test is inconvenient, inaccurate and expensive, the use of finite element method has become a powerful tool to calculate the cyclic stress-strain response of any structure or mechanical component. The finite element method is especially used in the ground vehicle industry where discontinuities of the geometry such as notches and holes produce difficulties to calculate the local cyclic stresses and strains, which are essential to predict the fatigue life of any structure or component [15,[17][18][19][20][21][22].…”