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4 Machine Dynamics Problems

4 2006

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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

2006

Vol. 30, No. 4

68-73

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.

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

2006

Vol. 30, No. 4

12-19

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.

Measurements of External Temperature in Rolling Tyre

Koštial P., Kučerová J., Mokryšová M., Švecová Z., Kopal I., Ružiak I.

Machine Dynamics Problems

2006

Vol. 30, No. 4

7-11

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.

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

2006

Vol. 30, No. 4

97-102

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.