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PubMed · 8329632

Is VXIbus for your biomedical measurement problem?

J S McAlwee·E A Bass·S T McBroom
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Abstract

This paper will review the applicability of VXIbus based instruments to the needs of the bioengineering and biomedical measurement communities. Peak signal bandwidths supported by VXIbus extend to the GHz range which is well above most biological signal requirements. Similarly, environmental compatibility specifications including electromagnetic compatibility, cooling, shock, and vibration may exceed most needs and add to unnecessary cost. Despite these potential mismatches, the instrument-on-a-card and the virtual instrument capabilities of VXIbus offer advantages over existing RS-232, IEEE488.1/.2, plug-in cards, and other "rack-and-stack" systems. Expansion and flexibility inherent in VXIbus devices make them resistant to obsolescence and easy to upgrade. Users are faced with a number of selection criteria when making instrumentation decisions. Bandwidth, power, isolation, cost, performance, software for control, and future development needs are among the issues that must be evaluated. A list of systems, devices, and suppliers is provided as part of this paper.

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BibTeXRIS

J S McAlwee, E A Bass, S T McBroom. 1993. Is VXIbus for your biomedical measurement problem?. https://pubmed.ncbi.nlm.nih.gov/8329632/

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The present paper addresses the numerical optimization of geometrical parameters of non-Newtonian micro-scale viscous pumps for biomedical devices. The objective is to maximize the mass flow rate per unit of shaft power consumed by the rotor when an external pressure load is applied along the channel that houses the rotor. Two geometric parameters are considered in the optimization process: (i) the height of the channel that houses the rotor (H) and (ii), the eccentricity (epsilon) of the rotor. Three different micro-scale viscous pump configurations were tested: a straight-housed pump (I-shaped housing) and two curved housed pumps (L- and U-shaped housings). The stress-strain constitutive law is modeled by a power-law relation. The results show that the geometric optimization of micro-scale viscous pumps is critical since the mass flow rate propelled by the rotor is highly dependent on epsilon and H. Numerical simulations indicate that mass flow rate is maximized when epsilon approximately 0, namely when the rotor is placed at a distance of 0.05 radii from the lower wall. The results also show that micro-scale viscous pumps with curved housing provide higher mass flow rate per unit of shaft power consumed when compared with straight-housed pumps. The results are presented in terms optimized dimensions of all three configurations (i.e., H(opt) and epsilon(opt)) and for values of the power-law index varying between 0.5 (shear thinning fluids) and 1.5 (shear-thickening fluids).

Biomedical Engineering↗