Acoustic devices for breathing investigations

Semyon Shkundin,Valentina Rumyantseva,N Maia,Z Dimitrovová

doi:10.1051/matecconf/201821104004

Semyon Shkundin, Valentina Rumyantseva + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201821104004

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Abstract

The problem of spirometry control in medicine and medical engineering still remains urgent. The necessity of getting more and more information from spirometry investigations imposes more and more stringent requirements for spirometers, volumeters and bodypletizmographs, first of all, to the primary spiroflow transdusers. Practice shows that these requirements cannot be met by improving devices which use conventional spirometric principles. The new acoustic means for pulsating air-gas flow rate measurement has been created in Russia and is described in the paper. The main feature is special air-metric channel, supplied with ceramics electroacoustic transducers. The principle of its operation is based on the dependence of the acoustic vibrations arriving at the receiver velocity upon the air-gas flow rate. The device does not disturb the air dynamic structure of the flow, has no inertia or moving elements and unsurpassed sensitivity and precision.

Highlights

There is an increase of the number of persons registered for the first time in connection with respiratory diseases
High morbidity associated with the respiratory system, is a priority problem in health care and medical science [1]
Due to the fact that COPD develops slowly, it is frequently diagnosed in people aged 40 years and older

Summary

Introduction

There is an increase of the number of persons registered for the first time in connection with respiratory diseases. The main causes of COPD (chronic obstructive pulmonary disease) are smoking, industrial dust and gases, adverse environmental conditions. The creation of them requires a description of the velocity field and the aeroacoustic interaction in the channel that makes the tasks of modeling and description of the physical processes underlying the acoustic measurement method of flow velocity implementation. In this simulation, the authors solved a number of aerodynamics and acoustics problems, allowing to model and as a result of researches, to create new plague level devices with unmatched performance

Modeling acoustic interaction with a homogeneous flow

An infinite cylindrical waveguide

A cylindrical waveguide with finite length

Conclusion