Significance of Elastance Variation on Respiratory System Dynamics

2002 ◽  
Author(s):  
A. M. Al-Jumaily ◽  
Y. Al-Fakhri
Keyword(s):  
Dynamic Response ◽  
System Dynamics ◽  
Frequency Spectrum ◽  
Respiratory System ◽  
Input Impedance ◽  
Airway Wall ◽  
Asymmetric Structures ◽  
Asthma Attack ◽  
Lung Structure ◽  
Recursion Formulas

The sensitivity of the respiratory system dynamic response to variations in the wall elastance is investigated. The acoustical approach is used to determine the impedance at the throat using impedance recursion formulas. Both symmetric and asymmetric structures are considered. The response of the lung structure indicates that when the airway wall elastance varies, as the case during an asthma attack, the overall normalized input impedance frequency spectrum could be used to give a reasonable signature for identifying such abnormality.

Simulation of Respiratory System for Identifying Airway Occlusion

2000 ◽  
Author(s):  
A. M. Al-Jumaily ◽  
P. Mithraratne
Keyword(s):  
Theoretical Model ◽  
Acoustic Wave ◽  
Dynamic Response ◽  
Respiratory System ◽  
Input Impedance ◽  
Symmetric Model ◽  
Airway Occlusion ◽  
Wave Approach ◽  
Model Based ◽  
Compliant Walls

Abstract A theoretical model is developed to study the dynamic response of the respiratory system using Weibel symmetric model based on the acoustic wave approach. Both rigid and compliant walls with rigid and compliant termination are investigated separately. For each case the response (normalised input impedance against prorogation frequency) is examined for occlusion at each generation from alveolar sacs up to the distal end of the trachea systematically.

Input-Shaped Control of Gantry Cranes: Simulation and Curriculum Development

2001 ◽  
Author(s):  
Craig Forest ◽  
David Frakes ◽  
William Singhose
Keyword(s):  
Dynamic Response ◽  
System Dynamics ◽  
Engineering Education ◽  
Work Environment ◽  
Computer Simulations ◽  
Gantry Crane ◽  
Input Shaping ◽  
Educational Tool ◽  
Institute Of Technology ◽  
Gantry Cranes

Abstract Knowledge of vibrations and controls has increased significantly by utilizing emerging computer capabilities. Engineering education should embrace this technology through computer simulations that predict and display the dynamic response of interesting systems. For example, manipulating payloads with an overhead gantry crane can be challenging due to the oscillations induced by the crane motion. The problem gets increasingly difficult when the work environment is cluttered with obstacles. This paper describes a simple input shaping solution to the vibration problem and shows how this problem and concept were integrated into the curriculum of an undergraduate system dynamics and controls course at the Georgia Institute of Technology. Furthermore, an educational tool is used to gather data on how crane operators attempt to navigate around obstacles. The results show that input shaping reduces the likelihood of collisions between the payload and obstacles, while at the same time allowing operators to be more aggressive in selecting navigation paths.

Determinants of respiratory system input impedance and bronchodilator response in healthy Finnish preschool children

2002 ◽  
Vol 22 (1) ◽  
pp. 64-71
Author(s):  
L. P. Malmberg ◽  
A. Pelkonen ◽  
T. Poussa ◽  
A. Pohjanpalo ◽  
T. Haahtela ◽  
...  
Keyword(s):  
Preschool Children ◽  
Respiratory System ◽  
Input Impedance ◽  
Bronchodilator Response ◽  
System Input

scholarly journals Experimental Study on the Vibration of an Overhung Rotor with a Propagating Transverse Crack

2002 ◽  
Vol 9 (3) ◽  
pp. 91-104 ◽  
Author(s):  
S.A. Adewusi ◽  
B.O. Al-Bedoor
Keyword(s):  
Experimental Study ◽  
Steady State ◽  
Dynamic Response ◽  
Frequency Spectrum ◽  
Transverse Crack ◽  
Vibration Signal ◽  
Vibration Measurement ◽  
Side Load ◽  
Propagating Crack ◽  
Vibration Signatures

This paper presents an experimental study on the dynamic response of an overhung rotor with a propagating transverse crack. The effects of a propagating transverse crack and side load on the dynamic response of an overhung rotor are investigated in order to identify vibration signatures of a propagating crack in rotating shafts. Startup and steady state vibration signatures were analyzed and presented in the form of Bode plots, Frequency Spectrum Cascades, Frequency Spectrum Waterfalls and orbits. The startup results showed that crack reduces the critical speed and increases the vibration amplitude of the rotor system. It also excites 2X vibration in the startup vibration signatures. The steady state results showed that the propagating crack produces changes in vibration amplitudes of 1X and 2X vibration harmonics and excites 3X harmonic just before fracture. During crack propagation, 1X amplitude may increase or decrease depending on the location of the crack and the direction of vibration measurement while 2X amplitude always increases. The steady state vibration signal of a propagating crack also produces a two-loop orbit.

Dynamic response of bilinear asymmetric structures

1985 ◽  
Vol 13 (4) ◽  
pp. 527-541 ◽  
Author(s):  
Pradip K. Syamal ◽  
O. A. Pekau
Keyword(s):  
Dynamic Response ◽  
Asymmetric Structures
Sign in / Sign up

Export Citation Format

Share Document