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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 Cause of Dynamic Stress on Propagation of Cracks in Vulcanizates
Cúth V., Kopecký M., Švecová Z.
Machine Dynamics Problems
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2004
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Vol. 28, No. 3
77-82
EN
Vulcanized rubber composition - rubber - belongs to a very important constructional and technological materials. Especially its elastic properties, gave rise to its indispensableness in technical practice. Task of this paper is the understanding of influence of various strains special developed mixtures for personal tire on the increase of cracks during the working of the product, it means his cyclic stress. The experiments were performed at various on instrument programming deviced strains on tension equipment INSTRON 4302 according to methodics developed in VUG Matador a.s. Puchov, which support on effect detection of various factor which influenced the propagation of crack growth.
7
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.
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