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1
Content available remote Lateral Forces Effect on Safety of Driving in Curve
Hajská H., Fandáková M., Kopecký M., Slabeycius J., Sága M.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
119-124
EN
In this contribution we presented measurements of lateral forces on a drum-testing machine. Measurements of lateral forces are introduced in tables and figures in dependence on radial load in different angles directional deviation.
2
Content available remote Computing Simulation of Heat Generation in Loaded Tyre and its Comparation with Experimental Results
Beláková A., Slabeycius J., Rartko R., Koštial P., Vavro J.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
31-35
EN
Cyclic strain of tyres leads to hysteresis loses. Long-term and repeated deformation damages tenacity of composite structure of tyre, which causes destruction of tyre. Radial personal tyres were laboratory tested on HASBACH test machine. The tyres were dynamically loaded. Changes of temperature of air in tyre were measured using thermocouples. The measurements were realized for various types of radial tyres and dependency temperature versus time for various values of internal tyre pressure and rotational velocity was measured. Suitable mathematic models were created. Parameters were determined using nonlinear regression from measured values.
3
Content available remote Computing Simulation of Dynamical Behavior of Rectangular thin Plates and its Comparison with Experimental Investigation Obtained by Holographic Interferometry
Rusnáková S., Slabeycius J., Koštial P., Bakošová D., Švecová Z., Vavro J.
Machine Dynamics Problems
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2004
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Vol. 28, No. 4
89-94
EN
In this study, experimental investigation vibration behavior of square composite plate by electronic speckle pattern interferometry (ESPI) is employed. Resonant frequencies and corresponding mode shape are obtained experimentally using the present method. The numerical calculations by the finite element method (Cosmos) are performed and the results are compared with the experimental measurements. Good agreement is obtained for both results of resonant frequencies and mode shapes. Theory of plate vibrations allows us to determine Poisson's ratio v, Young's modulus E and shear modulus G from the measured resonant frequencies.
4
Vibration of rectangular plate - mathematical modelling and experimental verification
Rusnakova S., Slabeycius J., Kostial P., Cuth V., Vavro J., Rypak M.
Zeszyty Naukowe Politechniki Poznańskiej. Maszyny Robocze i Transport
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2002
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Nr 54
159-164
EN
For observatory of vibrations of aluminum rectangular plate was used two different methods: mathematical and experimental. Experimental part was done by holograhpy speckle interferometry (HSI). This method - HSI - is very suitable for non-destructive observatory several types of materials - in our experiment is it aluminum rectangular plate. Results of this method - vibration modes - are applicable especially in designing of various structures. Results of the mathematical modeling are suitable for verifing and comparison with results from HSI method - they are very comparisonable. In our mathematical modeling program MARC was used with help of the FEM.
5
The analysis of the natural frequencies of disc for the tyres in program COSMOS M
Vavro J., Kopecky M., Kostial P., Slabeycius J., Fandakova M., Hajska E., Skulec M.
Zeszyty Naukowe Politechniki Poznańskiej. Maszyny Robocze i Transport
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2002
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Nr 54
201-206
EN
The model of the tyre disk was created in software Autocad and COSMOS M. There are calculated the first ten eigen frequencies disk in this article with the help of the software COSMOSM.
6
Experimental investigation of tread compounds frictional properties
Slabeycius J., Kostial P., Letko I., Vavro J., Zverina M., Randa D., Sipos M.
Zeszyty Naukowe Politechniki Poznańskiej. Maszyny Robocze i Transport
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2002
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Nr 54
165-170
EN
The friction properties of vulcanized rubber were investigated. The friction force between planar sample and chosen surface at various values of sliding velocity and normal pressure was measured. The experimental equipment based on standard tensile machine 1NSTRON 4302 was used. The samples of tread compQunds and some materials (asphalt, concrete, glass, steel) were tested. The experimental dependencies of the friction coefficient to the sliding velocity show good agreement with published experimental and theoretical results.
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