Loginova A.A. Determination of the durability of rubber vibration isolators of the support unit of the working body of shock-centrifugal disintegrators at aging in aggressive environment conditions

Determination of the durability of rubber vibration isolators of the support unit of the working body of shock-centrifugal disintegrators at aging in aggressive environment conditions

Loginova A.A.

Authors:

Loginova A.A., M.S. (Tech.) (IGTM NAS of Ukraine)

UDC 622.23.05

Language: Russian

Abstract.

The interdependence between the changed physical and mechanical characteristics of the elastic-damping elements of the support unit, time factor and aggressive environment, on the one hand, and rotor shaft vibrations in the shock-centrifugal disintegrators (SCD), on the other hand, is considered. An algorithm was created for determining operating parameters of the SCD as a dynamic system. In particular, the SCD amplitude-frequency characteristic is determined with taking into account rheological parameters of rubber vibration isolators with a quantitative determination of their dynamic rigidity and dissipation coefficient under the given operating conditions.

Based on the strict mathematical concepts, the key criterion – dissipation coefficient – is described, which determines durability of rubber vibration isolators in the SCD support unit. With the help of this criterion, an expression was formulated, which determines durability of the rubber elements operating under the action of acid corrosive environment. The resulting expression, which determines the durability index of the vibration isolation system, was set up on the basis of rheological parameters of the rubber, the maximum permissible vibration amplitude of the dynamic system, frequency of the disturbing force and the frequency of natural oscillations.

Keywords:

rubber assemblies and parts, durability of elastomers, acid aggressive environment, elastic-dissipative properties of rubber, aging of elastomers

References:

1. Nelson, H.D. and McVaugh, J.M. (1976), “The dynamics of rotor-bearing systems using finite elements”, ASME Journal of Engineering for Industry, vol. 98, pp. 593-600.

2. Zorzi, E.S. and Nelson, H.D. (1977), “Finite element simulation of rotor-bearing systems with internal damping”, ASME Journal of Engineering for Power, vol. 99, pp. 71-76.

3. Genta, G. (1988), “Whirling of unsymmetrical rotors, a finite element approach based on complex coordinates”, Journal of Sound and Vibration, vol. 124(1), pp. 27-53.

4. Hashish, E. and Sankar, T.C. (1984), “Finite element and modal analyses of rotor-bearing systems under stochastic loading conditions”, ASME Journal of Vibration, Acoustics, Stress, and Reliability in Design, vol. 106(1), pp. 80-89.

5. Ku, D.M. (1998), “Finite element analysis of whirl speeds for rotor-bearing systems with internal damping”, Mechanical Systems and Signal Processing, vol. 12(5), pp. 599-610.

6. Özgüven, H.N. and Özkan, Z.L. (1984), “Whirl speeds and unbalance response of multibearing rotors using finite elements”, Journal of Vibration, Acoustics, Stress and Reliability in Design, vol. 106, pp. 72-79.

7. Villa, C.V.S. (2005), “Dynamique non linéaire des rotors. Applications numériques et expérimentales à un rotor flexible”, Thèse présentée pour l’obtention du titre de docteur de l’école centrale de Lyon, spécialité mécanique, école doctorale de mécanique de Lyon (UCBL/INSA/ECL), Lion, France.

8. Prabel, B. (2013), “Analyse 3D des vibrations non-linéaires des rotors avec défauts”, 11e Colloque National en Calcul des Structures, Giens. France, 13 – 17 mai 2013.

9. Loginova, A.A., Ziborov, K.A. and Trubitsin, M.N. (2014), “Analysis of workflow features and structures support unit shock-centrifugal crushers with a vertical shaft working body”, Mining Electrical and Automation, vol. 91, pp. 131-137.

  1. 10.  Bulat, A.F., Dyrda, V.I., Zvyagilskiy, E.L. and Kobets, A.S. (2012), Prikladnaya mehanika uprugonasledstvennyih sred [Applied mechanics of elastic media], Nauk. dumka, Kyiv, Ukraine.

11. Loginova, A.A., Dyrda, V.I. and Shevchenko, V.G. (2015), “Calculation of vibration isolation systems of mining machines, taking into account the effect of aging”, Geo-Technical Mechanics, vol. 125, pp. 251-261.

12. Loginova, A.A., Dyrda, V.I. and Shevchenko, V.G. (2016), “Study parameters anti-vibration mounts mining machines under cyclic loading”, Geo-Technical Mechanics, vol. 127.

13. Loginova, A.A. (2017), “Influence of the aging effect in aggressive environment on the elastic-dissipative properties of the rubber elements”, Geo-Technical Mechanics, vol. 128.

About the authors:

Loginova Anastasiia Aleksandrovna, Master of Science, first category engineer of Department of Mechanics of Mineral Processing Machines and Processes, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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