Contents of Journal of Mechanical Engineering 56, 2 (2005) 


 
CIZMAR, K., STAREK, L.: Damage detection problem of vibrating mechanical 
systems (in Slovak)                                                          73 

MUSIL, M.: Comparison of correction methods for mathematical model of 
generally damped vibrating system (in Slovak)                               100 

CECH, I.: Suspension system of a rigid axle vehicle (in Czech)              122

Abstracts



Damage detection problem of vibrating mechanical systems

KVETOSLAV CIZMAR, LADISLAV STAREK

This paper provides a review of the literature concerning the methods that are used for damage detection or characterization of the health state of mechanical structures by the techniques based on the examination of changes in measured modal parameters of observed structures. The paper categorizes mentioned methods according to various criteria, like influence of damage on the structure, use of mathematical model, type of solution, or used spectral or modal data. Together with review of current state of the art in the field of vibration-based damage detection the practical difficulties are highlighted too.

Comparison of correction methods for mathematical model of generally damped vibrating system

MILOS MUSIL

The mathematical model of a vibrating mechanical system obtained by modelling in finite elements method (FEM) should be consistent with data, which follow from the measurements on the test structures. But real applications confirm that this premise is not quite fulfilled. So it is necessary to modify the FEM model to correlate the computed and measured data. The target of this paper is to design and compare direct and iterative procedures for the correction of the generally damped mathematical model. Direct procedures use expansion methods to compute unmeasured degrees of freedom. Iterative procedures are based on the sensitivity analysis of modal data and frequency response functions.

Suspension system of a rigid axle vehicle

ILJA CECH

Based on the linear half car model four criteria of suspension performance were determined for a land vehicle. The criteria values are compared for a vehicle with rigid axle, a vehicle with independent suspension and a vehicle with active suspension for cornering manoeuvre, for vertical excitation by unevenness in anti-phase, for lateral impulse input, as well as for random vertical excitation. The advantages of rigid axle in comparison to the other approaches were found to be somehow problematic.