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1
Content available remote The Thermal Data Interpolation in Data Reduction for Evaluation of Thermal Diffusivity Measured by Flash Method
Kopal I., Koštial P., Ruziak I., Švecová Z., Kučerová J., Mokryšová M.
Machine Dynamics Problems
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2006
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Vol. 30, No. 3
163-166
EN
The paper presents a powerful algorithm useful to solve the problem of experimental data values finding don't occur within the registered experimental data set by using the one-dimensional polynomial interpolation procedure via a cubic spline method. Described free algorithm is presented in the form of Matlab routine with short author's comments.
2
Content available remote The Optimization of Tyre Construction and the Construction Influence on the Rolling Resistance
Mokryšová M., Koštial P., Kopal I., Kučerová J., Švecová Z., Ružiak I.
Machine Dynamics Problems
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2006
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Vol. 30, No. 4
68-73
EN
The rolling resistance (RR) of tyres under vertical load can be measured in the laboratory on a large smooth rolling drum. We have determined the most suitable the steel belt angle. The higher steel belt angle leads to lower rolling resistance, to the better comfort and lower fuel consumption.
3
Content available remote The Fillers Distribution Influence on Rubber Compounds Thermal Conductivity
Koštial P., Ružiak I., Kučerová J., Mokryšová M., Švecová Z., Kopal I., Bezecný J., Osipcakova D.
Machine Dynamics Problems
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2006
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Vol. 30, No. 4
12-19
EN
In the paper we are presenting the study of fillers distribution influence on rubber compounds thermal conductivity. The inhomogeneity of fillers distribution is presented on the measurements of thermal diffusivity as well as the electrical conductivity of rubber compounds.
4
Content available remote Measurements of External Temperature in Rolling Tyre
Koštial P., Kučerová J., Mokryšová M., Švecová Z., Kopal I., Ružiak I.
Machine Dynamics Problems
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2006
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Vol. 30, No. 4
7-11
EN
In this paper we are presenting a complex system for the simultaneous contact-less measurement of external tyre temperatures. The measurement is fully automatic, controlled by a personal computer, and installed "in situ" on the car. The global position system, which is connected with the PC, allows simultaneous measurements of temperatures, pressure and also the car speed.
5
Content available remote Contact Measurement of Thermal Transport Properties of Laminates in Vertical and Horizontal Direction by EDPS Method
Ružiak I., Kopal I., Koštial P., Mokryšová M., Švecová Z., Kučerová J.
Machine Dynamics Problems
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2006
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Vol. 30, No. 4
97-102
EN
In this paper we present the contact measurement of thermal transport properties of distinguished laminate using the extended dynamic plane source (EDPS) method. All used methods are appropriate for the determination of thermal transport properties of materials with low thermal conductivity. Measurement errors do not exceed five percent. We have measured thermal transport properties of laminate in vertical and horizontal directions.
6
Content available remote The Infrared Thermography Applications in Material Engineering
Koštial P., Kopal I., Mokryšová M., Hajduchová L., Klabník M., Žiačik P.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
183-188
EN
This paper is a contribution into a wider discussion about nondestructive testing in material engineering. The aim of described research is the enhancement of experimental possibilities for subsurface defects detection in materials, products and structures by using an infrared scanning detector camera in real conditions of industrial practice. It was demonstrated that such type of high quality infrared imagers, supported by pulsed thermography with external thermal stimulation, powerful personal computer and several simple image-processing procedures, could serve as a useful tool for contactless detection of various types hidden flaws in different materials.
7
Content available remote The Experimental Measurement of the Tire Impurities Circulation by the Dynamic Loading and Application of the Experimental Evaluation by the Method of the Active Factor Experiment
Vavro J., Kopecký M., Koštial P., Hajská H., Fandáková M.
Machine Dynamics Problems
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2004
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Vol. 28, No. 4
171-176
EN
The article is dealing with the measurement of the tire impurities circulation by the dynamic loading along with the disc. There are made measurements for the various tire velocities on the roadway by the constant inflation pressure in tire and by the tire constant external loading and time service longitudes. In the article is suggested the process of the measurement evaluation by the method of the active factor experiment.
8
Content available remote Optical Apparatus for Non-Destructive Measurements of Spatial Profile of Objects
Koštial P., Mokryšova M., Kopal I., Klabník M., Žiaćik P.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
189-194
EN
In the paper we presented the results of measurements of tyre sidewall by commercially produced system Aramis in dynamic regime.
9
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.
10
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.
11
Content available remote Advanced Diagnostic Methods Used in the Rubber Industry
Koštial P.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
177-182
EN
In the contribution we present the overview of following advanced techniques used in the rubber industry - the analysis of deformation characteristics of charged tyres by Aramis system, the interferometric analysis of tyres, the analysis of specific distribution of pressure in a tyre.
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