№72-15
Determination of the model of a powered air-purifying respirator for researching its operational modes
D. Slavynskyi1
1Dnipro University of Technology,Dnipro, Ukraine
Coll.res.pap.nat.min.univ. 2023, 72:172-185
https://doi.org/10.33271/crpnmu/72.172
Full text (PDF)
ABSTRACT
Purpose. Justification of technical decisions when creating an experimental equipment of a powered air-purifying respirator (PAPR), development of a research system, planning and conducting an experiment, determining the structure of the object and its parameters, confirming the adequacy of the obtained simulation model of the PAPR to the control object in accordance with the conditions of the technological process.
Methodology. The research was carried out on experimental equipment by means of an active experiment. It is proposed to use a sensor with an analog output and a controller for data registration to control the pressure. By varying the rotation speed of the fan, the value of the pressure in the respirator mask was determined. Structural and parametric identification and verification of the obtained model for adequacy to the control object according to the Fisher criterion were carried out on the basis of the obtained data.
Findings. Based on the results of the study, it was established that the PAPR is an asymmetric object according to the "fan rotation speed - pressure in the mask" channel. The processes of pressure increase and decrease correspond in form to exponential functions and can be described by aperiodic links of the first order with different time constants. Based on the analysis of the structure of the control object, a corresponding asymmetric model was created in which aperiodic links are represented in the state space. Theprocess time constants and amplification factor of the model were determined by parameter estimation. The adequacy of the obtained simulation model to the control object was confirmed by Fisher's criterion.
Originality. For the first time, a continuous transfer function of a PAPR was obtained in the form of a complex of two firstorder aperiodic links with different time constants.
Practical value. A universal method of obtaining simulated models of PAPRs by using the developed experimental equipment and simulation environment of the MATLAB. The obtained simulation model of the PAPR allows to research its operating modes in order to determine the requirements for the control system and its further synthesis using various regulators.
Keywords: motorized respirator, experimental setup, identification, simulation model, research, quality criteria of the mathematical model.
References
1. Travmatyzm na vyrobnytstvi: skilky bulo vypadkiv i de nainebezpechnishe pratsiuvaty v Ukraini. (2021). Analitychnyi portal Slovo i dilo. https://www.slovoidilo.ua/2021/04/28/infografika/suspilstvo/travmatyzm-vyrobnycztvi-skilky-bulo-vypadkiv-najnebezpechnishe-pracyuvaty-ukrayini
2. Profilaktyka vyrobnychoho travmatyzmu ta profesiinykh zakhvoriuvan za 2022 rik (2023). Fond sotsialnoho strakhuvannia Ukrainy. Statystychni dani. http://www.fssu.gov.ua/fse/control/main/uk/publish/article/985104
3. Penteado, J. O., Peres, T. G., Ramires, P. F., de Lima Brum, R., da Silva Freitas, L., Volcão, L. M., dos Santos, M., & Da Silva Júnior, F. M. R. (2022). Trends in pneumoconiosis in Brazil, 1979–2019. Occupational Medicine, 72(6), 386–393.
https://doi.org/10.1093/occmed/kqac017
4. Cole, K., Glass, D., Bence, T., Pisaniello, D., Knott, P., Rowett, S., & Johnson, S. (2023). Prevention of the Occupational Silicosis Epidemic in Australia: What Do Those Who Assess Workplace Health Risk Think Should Be Done Now? Annals of Work Exposures and Health, 67(2), 281–287.
https://doi.org/10.1093/annweh/wxac064
5. Saran, S. (2021). CPR in COVID-19: Should We Use the PAPR to Keep the Savior Safe? Indian Journal of Critical Care Medicine, 25(8), 950–950.
https://doi.org/10.5005/jp-journals-10071-23925
6. Licina, A., & Silvers, A. (2021). Use of powered air-purifying respirator(PAPR) as part of protective equipment against SARS-CoV-2-a narrative review and critical appraisal of evidence. American Journal of Infection Control, 49(4), 492–499.
https://doi.org/10.1016/j.ajic.2020.11.009
7. Srinivasan, O., Vijayakumar, V., & Ganesamoorthi, A. (2021). COVID-19 pandemic: choosing a loose-fitting PAPR for better protection? Add an N95 FFR. Ain-Shams Journal of Anesthesiology, 13(1), 37.
https://doi.org/10.1186/s42077-021-00156-4
8. Weiss, R., Guchlerner, L., Weissgerber, T., Filmann, N., Haake, B., Zacharowski, K., Wolf, T., Wicker, S., Kempf, V. A. J., Ciesek, S., Stöver, T., & Diensthuber, M. (2021). Powered air-purifying respirators used during the SARS-CoV-2 pandemic significantly reduce speech perception. Journal of Occupational Medicine and Toxicology, 16(1), 43.
https://doi.org/10.1186/s12995-021-00334-y
9. Park, S. H. (2020). Personal Protective Equipment for Healthcare Workers during the COVID-19 Pandemic. Infection & Chemotherapy, 52(2), 165.
https://doi.org/10.3947/ic.2020.52.2.165
10. Wood, S. G. A. (2020). Numerical modelling of fluid flow through a powered air-purifying respirator filter. Newcastle University http://theses.ncl.ac.uk/jspui/handle/10443/5229
11. Wagner, N. A. (2012). Servo blower control for powered air purifying respirators. Thesis. Colorado State University. Fort Collins. https://mountainscholar.org/bitstream/handle/10217/75298/Wagner_colostate_0053N_114.pdf
12. Koval, A.V. (2018). Identyfikatsiia ta modeliuvannia tekhnolohichnykh ob’iektiv: navch. Posibnyk. ZhDTU.
13. Determination of air flow resistance of breath responsive, powered air-purifying respirators (PAPR’s) standard testing procedure (STP). (2005).National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npptl/stps/pdfs/RCT-APR-0065-508.pdf.
14. Lazariev, Yu. F. (2011). Modeliuvannia dynamichnykh system u Matlab. Elektronnyi navchalnyi posibnyk. NTUU "KPI".
15. Sharuda, V.H., Tkachov, V.V., & Bublikov, A.V. (2015). Doslidnytska chastyna v kvalifikatsiinii roboti mahistra: navch. posib. Natsionalnyi hirnychyi universytet.
16. Documentation goodness Of Fit. (n.d.). Mathworks. Help Center https://www.mathworks.com/help/ident/ref/goodnessoffit.html
