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Romuald Bertolaso
Abstract
Numerical and experimental study of the load distribution in a balls screw system
Romuald Bertolaso - 24 June 2010
With the expansion and diversification of the application of the
ballscrew in recent years, there is a strong demand for this
system which has better functionality thanks to a large
mechanical efficiency and high power transmission. Screw ball of
this study is part of the horizontal actuators (THSA)
aircraft. The mobility function of the rear is provided by
moving a nut along the screw through a system recirculating
ball. The work presented in this paper concerns the study of the
load distribution in the volume for ballscrews systems It is to
develop a finite element model for assessing the distribution of
constraints in order to calculate the lifetime of these elements
and optimize the system. After defining the characteristics of a
ballscrew, an experimental approach was carried out in parallel
a study of finite element simulation to validate assumptions for
different models.
Measuring Method used to highlight the load distribution in the
volume is photoelasticity. In terms of applications, 2D
photoelasticity will be used for experimental analysis of
mechanical behavior of ball screws and simplified photoelastic
3D optical sectioning for a bearing ball model.
The numerical elements validation is studied done by comparing
the results obtained experimentally and by numerical
calculations. More specifically, the comparison is between
photoelastic experimental fringes and fringes numerical
calculated after post-processing of simulations. The conditions
limits and validated the result simulations that were
quantitative and qualitative become. The next step is coupling
of these qualitative results in a fatigue model to calculate the
lifetime of the models studied.
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