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2 Machine Dynamics Problems

2 2004

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The Cause of Dynamic Stress on Propagation of Cracks in Vulcanizates

Cúth V., Kopecký M., Švecová Z.

Machine Dynamics Problems

2004

Vol. 28, No. 3

77-82

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.

Rotating Machines Parts and their Vibration Control

Kopecký M., Cúth V., Vavro J.

Machine Dynamics Problems

2004

Vol. 28, No. 3

171-176

The development of new aggregates of mobile machine aims at the reduction of production and operational costs and, at the same time, at the increase of transmitted power when a sufficient reliability is provided. Simultaneously, the real operational safety concerning maximum permissible stress is also rescued. This results in necessity of further more exact methods of design and strength control of aggregate elements. The use of vibration data from rotating machinery to determine machine health has a long history. A practical example of gearbox vibration frequency analysis is presented, which demonstrates the use of high-resolution frequency controls using zoom FFT for diagnostic purposes. It is intended to show how to get and interpret good results from controls, with particular reference to points, which arise in gearbox applications.