ENGINEERING TRANSACTIONS
ROZPRAWY INŻYNIERSKIE
A QUARTERLY JOURNAL
These papers were presented at the 7-th International Conference on Active Noise and Vibration
Control Methods.
- Z. Basista:
Simulation investigation of an active vibration protection system
of an operator of a hand-held percussive toolF
- M. ChodĽko, K. Marchelek, A. Parus:
Self-excited vibrations counteraction in machine tool - cutting
process system using controllable eliminator of vibration
- J. Konieczny, J. Kowal, J. Pluta, A. Podsiadło:
Laboratory research of the controllable hydraulic damper
- M. Pietrzakowski:
Dynamic effects of material damping in active laminates reinforced
with piezoceramic fibers
- B. Sapiński, S. Bydoń:
Magnetorheological rotary brake: analysis, design considerations
and experimental evaluation
- Z. Basista:
Simulation investigation of an active vibration protection system
of an operator of a hand-held percussive toolF
- In the paper a complex model of the system operator-tool-base (OTB) has been presented. The evaluation
and choice of the correct vibration isolation system of the grip of hand-held percussive tools requires
a proper model of the system OTB. In the OTB model adapted in the paper, the model of the man-operator
describes not only the dynamical reaction of the operator hands to vibration but also the behaviour of
the operator as a system which controls the tool operation. Using this model, the necessary criteria for
the assessment of the working comfort are formulated. Simulation of the model OTB with the proposed
nonlinear pneumatic active vibration isolation system was done applying the Matlab-Simulink. The
influence of parameter values of the vibration isolation system on the assumed comfort criteria was
analyzed. The results obtained have been graphically presented.
Contents
- M. ChodĽko, K. Marchelek, A. Parus:
Self-excited vibrations counteraction in machine tool - cutting
process system using controllable eliminator of vibration
- In the paper, the results of simulation investigations on the application of a semi-active vibration
eliminator for suppression of machining chatter are presented. First, the idea of a semi-active vibration
eliminator arranged in the "machine tool - cutting process" system (MT-CP) is presented. Next, the results
of the identification process of parameters of this system are shown. Properties of the mass-damping-spring
system of the machine tool were estimated during the modal testing. A mechanistic model of the cuttingprocess
was built on the basis of results of cutting tests. Two control algorithms have been tested: one with the
time-invariant model of disturbances (MD) and another with the adaptive model of disturbances. Estimation
of the eliminator effectiveness in the suppression of self-excited vibrations in a MT-CP system is also included.
Contents
- J. Konieczny, J. Kowal, J. Pluta, A. Podsiadło:
Laboratory research of the controllable hydraulic damper
- The main focus is on the hydraulic shock absorbers employed in vehicles, in the context of parameters
associated with the damping force control for the given direction of action and with the energy dispersion.
Two types of shock absorbers are examined: those with constant and variable parameters of damping force
adjustment. Shock absorbers that were subject to research investigations included a commercially -
available shock absorber with fixed parameters and an experimental absorber with variable parameters.
The paper summarises the problems experienced during modelling of hydraulic shock absorbers when the
equivalent damping ratio is sought. Damper properties and the methods of determining them are outlined.
The laboratory tests performed on these shock absorbers are considered in more detail and relevant
characteristics are provided for the sake of comparison. The reasons why shock absorbers with fixed
parameters have been in widespread use for many years are now investigated, highlighting the aspects
which prompt the research work on shock absorbers with variable parameters.
Contents
- M. Pietrzakowski:
Dynamic effects of material damping in active laminates reinforced
with piezoceramic fibers
- In the paper rectangular, simply supported, laminated plates composed of classical fiber-reinforced
layers and active layers of piezoelectric properties are under consideration. The aim of the study is to
determine the influence of anisotropic passive damping on the active vibration reduction achieved and the
sensitivity of the system to material axes' orientation of piezocomposite actuator layers. The effects of
piezoceramic fiber direction and passive damping intensity are illustrated by means of the
amplitude-frequency characteristics.
Contents
- B. Sapiński, S. Bydoń:
Magnetorheological rotary brake: analysis, design considerations
and experimental evaluation
- The paper is concerned with analysis, design considerations, construction and experimental
testing of a magnetorheological rotary brake (MR brake). Operation principle and basic
relationships for the brake are discussed. Magnetic field distribution in the brake is numerically
studied using the finite element method (FEM). Structure and materials used in the main components
of the brake are described. The brake performance is evaluated via measurement of torque responses.
Contents
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