Contents of Journal of Mechanical Engineering 53, 3 (2002)
I. JANIGA, R. MIKLOS, R. PALENCAR: Evaluation of type A uncertainty
in the verification of gauge with continuous scale using order
statistics (in Slovak) 133
E. KUREKOVA, R. PALENCAR: Evaluation of the measurement process
capability (in Slovak) 141
P. MUCKA: Active suspension of a heavy-vehicle driven axle
(in Slovak) 153
J. JANKOWSKI, R. STAROSTA: Time evolution of the initial temperature
distribution inside the solid 166
P. Z. KOVACS, I. PACZELT: Finite element investigation of an adaptive
cantilever plate 180
Abstracts
Evaluation of type A uncertainty in the verification of
gauge with continuous scale using order statistics
IVAN JANIGA, ROMAN MIKLOS, RUDOLF PALENCAR
In the paper a new method for calculation of uncertainty of type A
by order
statistics is given. This method provides a correct determination of the
uncertainty of the type A in the verification of gauge with continuous
scale. The computation can be performed very easily using given tables. The
whole computation procedure is demonstrated on an example from the
metrological practice.
Evaluation of the measurement process capability
EVA KUREKOVA, RUDOLF PALENCAR
The paper introduces basic approaches to the measurement process control via
measurement process capability. Measurement process control represents the
basic tool for quality assurance related to the metrological aspects of the
production. Definition of the measurement process, requirements put on it and
its evaluation by the capability indices is presented. Theoretical foundation
of determination of the measuring process capability is demonstrated on
calculation of the first generation capability index. Conclusions on different
approaches to the capability indices of the measurement process are based on
real data analysis as well as on performance simulation of the individual
capability indices.
Active suspension of a heavy-vehicle driven axle
PETER MUCKA
In this paper three optimized active suspension concepts for heavy vehicles
are analysed. For modelling of heavy vehicle dynamic behaviour the
longitudinal plane half-car model is used. The vehicle model is kinematically
excited by random road unevenness and by obstacles of various shapes.
Specially the influence of active suspension concepts on the reduction of
dynamic tyre forces is evaluated. Also capacity of active suspension concepts
to provide improved ride comfort and small workspace of suspension is taken
into account.
Time evolution of the initial temperature distribution inside the solid
JANUSZ JANKOWSKI, ROMAN STAROSTA
The paper presents the influence of initial temperature on the evolution of
the temperature distribution inside the body region. An approximate method of
solution of a non-homogeneous initial-boundary value problem for heat
conduction is considered. A boundary condition of the third type is assumed.
The new approach called the Fictitious Heat Sources (FHS) method is based on
the classical Method of Fictitious Sources. The essential point of this work
is to generalize the FHS method in order to enable the use of the
non-homogeneous initial condition. It has been achieved by the principle of
superposition of solutions. The method is illustrated by two examples of
distribution of temperature in a rectangular region.
Finite element investigation of an adaptive cantilever plate
PAL ZOLTAN KOVACS, ISTVAN PACZELT
We formulate the appropriate piezoelectric coupled electromechanical
functional which is the basis of a finite element model. A simple numerical
example is presented to prove that finite element method is a good approach to
a model with such intelligent structures. Piezoelectric patches glued onto a
cantilever plate have been simulated by using 3D h- and p-version finite
elements. The results of both approximations are compared with each other for
suitability and economy and with the results of experiments, showing a good
agreement.