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Identification of the Bodner Partom Model for Special Granular Structures : Preliminary Approach

Zalewski R., Skalski P.

Machine Dynamics Problems

2008

Vol. 32, No. 2

119-127

This work deals with new "smart systems" that are based on granular materials. These systems consist of a tight flexible sleeve, which is filled with a granular material. The air is then pumped out of the sleeve, causing underpressure, compressing the granules and so making the system more rigid and changing its damping characteristics. This allows for quick, easy, and inexpensive controls of the damping and stiffness of such systems. The aim of this paper is to present the experimental results of uniaxial tests of a sleeve filled with granular materials. These results support the modeling of such a system filled with a granular material using the Bodner-Partom viscoplastic constitutive law.

Budowa i badania funkcjonalne doświadczalnego tłumika drgań z cieczą magnetoreologiczną.

Sapiński B., Szydło Z.

Zagadnienia Eksploatacji Maszyn

2003

Vol. 38, nr 1

95-106

W pracy opisano doświadczalny liniowy tłumik magnetoreologiczny (MR) ze szczeliną pierścieniową, zaprojektowany do celów badawczych. Jest to semiaktywny tłumik drgań z bezstopniową zmianą charakterystyki tłumienia. Sterowanie tłumikiem MR odbywa się na zasadzie modulacji szerokości impulsu prądu płynącego w cewce obwodu magnetycznego. Podano parametry cieczy stosowanych w doświadczalnym tłumiku. Opisano badania funkcjonalne zaprojektowanego i wykonanego tłumika, którego celem było sprawdzenie współpracy elementów mechanicznych oraz działania układu sterującego.

Since a time is undertaken an effort to develop the efficient, flexible and reliable vibration damper for the use in structures that operate in variable work conditions. Such damper known as the semi-active damper has to be easily and automatically accommodated to the actual vibration and load level. Majority of commercial designs are based on the conception of the step-by-step changed damping characteristics available in hydraulic dampers owing to their special internal valves arrangement, eventually controlled by the electronic system. It appeared in the last decade that the magnetorheological fluid (MR) is a material, which could be very prospective in semi-active dampers, and moreover it offers the possibility of step less change of the damping characteristics. Thus MR fluids demand for intensive investigations to recognize their specific tribological and rheological properties. The subject of the paper is the experimental linear magnetorheological (MR) damper with the circular gap. This damper has been specifically designed and assembled for testing purposes. In the paper is described the structure of the damper and there is also explained the principle of its operations together with some details connected with specific testing purposes. It was necessary to check the cooperation of mechanical elements of the damper and functioning of the entire device including its control system. This task has been realized by the examination of the damper characteristics in its vibration tests on the experimental setup by the use of the INSTRON 8511.20 machine. Two types of MR fluids and the typical oil used in vehicles shock absorbers were applied in tests.