Experimental determination of dynamic characteristics of the impeller-bearing-housing system of ventrassist™ blood pump

Publication Type:
Conference Proceeding
4th Australasian Congress on Applied Mechanics, ACAM 2005, 2005, pp. 317 - 322
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This paper presents an experimental investigation of the dynamic coeficients of the hydrodynamic bearing of the rotary blood pump for various pump speeds. A special test rig was developed to enable the measurements of pump housing absolute displacement and the impeller displacements relative to the housing to be taken simultanuously during the operation of the pump. From the measured decaying sine wave displacement, the natural frequency, damping and stiffness coefficients of the impeller-bearing-housing system were determined. Results indicate that stiffness and damping coefficients increased as flow rate and pump speed increased, representing an increase in stability with these changing conditions. © Institute of Materials Engineering Australasia Ltd 2005.
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