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Dynamic method for determining critical loads in the PRINS computer program
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In: Structural Mechanics of Engineering Constructions and Buildings, Vol 16, Iss 5, Pp 380-389 (2020) (2020)
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A comparative study of beam design curves against lateral torsional buckling using AISC, EC and SP
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In: Structural Mechanics of Engineering Constructions and Buildings, Vol 15, Iss 1, Pp 25-32 (2019) (2019)
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The development of chart based method for steel beam designs using the Russian sections
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In: Structural Mechanics of Engineering Constructions and Buildings, Vol 14, Iss 6, Pp 495-501 (2018) (2018)
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THEORETICAL APPROACH FOR THE GEOMETRICALLY NONLINEAR BUCKLING ANALYSIS OF SINUSOIDAL VELAROIDAL SHELLS
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In: Structural Mechanics of Engineering Constructions and Buildings, Vol 0, Iss 3 (2017) (2017)
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The origin of Korotkoff sounds and the accuracy of auscultatory blood pressure measurements
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In: Weldon School of Biomedical Engineering Faculty Publications (2015)
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Abstract:
This study explores the hypothesis that the sharper, high frequency Korotkoff sounds come from resonant motion of the arterial wall, which begins after the artery transitions from a buckled state to an expanding state. The motion of one mass, two nonlinear springs, and one damper, driven by transmural pressure under the cuff, are used to model and compute the Korotkoff sounds according to principles of classical Newtonian physics. The natural resonance of this spring-mass-damper system provides a concise, yet rigorous, explanation for the origin of Korotkoff sounds. Fundamentally, wall stretching in expansion requires more force than wall bending in buckling. At cuff pressures between systolic and diastolic arterial pressure, audible vibrations (> 40 Hz) occur during early expansion of the artery wall beyond its zero pressure radius after the outward moving mass of tissue experiences sudden deceleration, caused by the discontinuity in stiffness between bucked and expanded states. The idealized spring-mass-damper model faithfully reproduces the time domain waveforms of actual Korotkoff sounds in humans. Appearance of arterial sounds occurs at or just above the level of systolic pressure. Disappearance of arterial sounds occurs at or just above the level of diastolic pressure. Muffling of the sounds is explained by increased resistance of the artery to collapse, caused by downstream venous engorgement. A simple analytical model can define the physical origin of Korotkoff sounds, suggesting improved mechanical or electronic filters for their selective detection, and confirming the disappearance of the Korotkoff sounds as the optimal diastolic endpoint.
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Keyword:
biomechanics; Biomedical Engineering and Bioengineering; brachial artery; buckling; diastolic dilemma; muffling; sphygmomanometry
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URL: https://docs.lib.purdue.edu/bmepubs/54
https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1064&context=bmepubs
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Buckling Analysis for Members with Variable Rigidity by Using the Finite Element Method
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In: Bulletin of the Polytechnic Institute of Jassy: Constructions, Architechture Section, Vol LVI (LX), Iss 2, Pp 37-50 (2010) (2010)
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