### Contents of Journal of Mechanical Engineering *55,* 3 (2004)

RYCHLIK, M., MORZYNSKI, M., NOWAK, M., STANKIEWICZ, W., LODYGOWSKI, T.,
OGURKOWSKA, M.: Acquisition and transformation of biomedical objects to
CAD systems 121
KVASNICKA, P., PALCAK, F.: Optimization of the suspension damper
on a quarter car model using ride comfort criteria in a multiobjective
function 136
VLK, F., KOLLHAMMER, D.: Mathematical simulation of vehicle handling
(in Czech) 151
SLIZEK, O., ORAVSKY, V.: Sensitivity analysis of chosen parameters on
the properties of rectangular plate and cylindrical shell (in Slovak) 166

# Abstracts

### Acquisition and transformation of biomedical objects to CAD systems

MICHAL RYCHLIK, MAREK MORZYNSKI, MICHAL NOWAK, WITOLD STANKIEWICZ,
TOMASZ LODYGOWSKI, MALGORZATA B. OGURKOWSKA

The paper addresses data acquisition and processing for three-dimensional biomedical models. The aim
is to reconstruct the topology of the organ as well as to construct on this basis the consistent
computational grid. The additional data like density are to be included. The emphasis is on practical
problems encountered during such procedure. On the example of human vertebra, methods of generation
of the volume tetrahedral mesh for FEM are discussed. Authors present methods of reconstruction 3D
models available in CAD software and present concept of practical use of empirical eigenmodes
(Proper Orthogonal Decomposition - POD) for reconstruction of complex biomechanical models. The
empirical eigenmodes can be used also for modelling the volume properties (like tissue density)
what is important in FEM stress analysis. This paper is a part of the project of the Polish State
Committee for Scientific Research.

¸

### Optimization of the suspension damper on a quarter car model using ride
comfort criteria in a multiobjective function

PAVEL KVASNICKA, FRANTISEK PALCAK

After theoretical background for the ride comfort and driving safety optimization,
a study of the influence of the ride comfort criteria to a multiobjective optimization of a
suspension damper is presented in this paper. The objective function *Obj*_{SCD}
was constructed as a weighted combination of the ride comfort perception quantity
*A*_{vT}, standard deviation (sigma)_{Fn} of the normal tire force,
and standard deviation (sigma)_{D} of the relative displacement of the wheel to the car body.
For the ride comfort perception optimization and the car model identification a MATLAB toolbox was
developed.

### Mathematical simulation of vehicle handling

FRANTISEK VLK, DAVID KOLLHAMMER

The paper deals with mathematical modelling of vehicle handling. The meaning of
simulation and its relationship to the engineering industry is explained in the introduction.
Theoretical keystones from which the simulation starts are described here. Whole model starts
from basic physical rightfulness and mathematical description of actions, which arise from
vehicle motion. There are described selected models of simulation. System of differential
equations is solved by Runge-Kutta numerical integration. Some illustrations of the results
solved by this method are presented here, too. The principle of verification of the results and
possibility of future development are also discussed in this thesis.

### Sensitivity analysis of chosen parameters on the properties of rectangular plate
and cylindrical shell

OLDRICH SLIZEK, VLADIMIR ORAVSKY

Influence of parameters of multi-parameter systems upon their behaviour
is investigated by means of a special sensitivity analysis. After statistical evaluation
of special criteria, one can find a matrix of influence and a sequence of dominance of
parameters and thus obtain the full review of influence. At the same time one can judge,
which parameter is mostly suitable for variation to reach effective change of chosen output
quantity.

The above general approach has been applied to a rectangular plate and a cylindrical shell,
whereby influence of their geometrical and material parameters upon their eigenfrequency
has been investigated. Sensitivity analysis of the rectangular plate has served only for
verification. The main effort has been focused upon sensitivity analysis of a thin cylindrical
shell, where influence of individual parameters is not evident from analytical expressions.

The results of investigation are tabulated and presented in the form of a full review of
influence and representative diagrams, where influence of some parameters upon eigenfrequency
is plotted and evaluated.