Contents of Journal of Mechanical Engineering 52, 6 (2001)
O. KROPAC: Characteristics of longitudinal road unevenness:
definitions, estimation and use 325
J. MURIN, V. KUTIS: Solution of non-incremental FEM equations
of non-linear continuum 360
A. USCILOWSKA: Equilibrium problem of a multi-articulated tower
immersed in fluid 372
Abstracts
Characteristics of longitudinal road unevenness: definitions, estimation and
use
O. KROPAC
A general overview of the present state-of-the-art of main problems connected
with the longitudinal unevenness of roads is given. After a short historical
introduction the following aspects are discussed: characteristics of random
and local unevenness; methods of providing primary data from real roads
including relevant measuring devices; processing of data and forms of
presenting results including their precision estimation; state of
standardization effort; generalized characteristics reflecting deviations from
standard analytical models; main areas of exploitation of different
characteristics of unevenness. The mutual interaction between road and
travelling vehicle and methods of statistical dynamics form the background of
the conception applied in this paper; accordingly, characteristics, which
follow from this approach, are preferably recommended for use.
Solution of non-incremental FEM equations of non-linear continuum
J. MURIN, V. KUTIS
This paper deals with solving non-incremental non-linear FEM equations of
non-linear continua which were derived without linearization and without using
the mid-configuration (by describing the deformation motion of a body). Two
iterative solution algorithms of these equations are proposed that use the
full non-linear and non-linear tangent stiffness matrices of finite elements.
The convergence and accuracy of our iterative algorithms are compared with
results which were obtained by the ANSYS computer code (incremental and
linearized FEM equations). These numerical experiments were performed for
several bar constructions.
Equilibrium problem of a multi-articulated tower immersed in fluid
A. USCILOWSKA
One kind of more and more popular offshore structures are articulated towers
or manipulators of robots partially or fully immersed in water. This paper is
a consideration of the equilibrium positions of a multi-articulated tower
fully or partially immersed in still fluid. The tower is treated as an
inverted multi-pendulum. The problem considered is a static one. The
equilibrium positions of the multi-articulated tower are found by solving the
equilibrium equations for forces and moments. The analysis of potential energy
of the system (multi-articulated tower/fluid) is used to determine the
stability of calculated equilibrium positions of the considered tower. The
results of numerical calculations are presented and discussed.