Wyniki wyszukiwania - BazTech

1

Diagnostyka stanu napełnienia sztucznej komory serca POLVAD

Siewnicka A., Fajdek B., Janiszowski K., Chołost K.

Pomiary Automatyka Kontrola

|

2012

|

R. 58, nr 1

40-43

PL

Niniejszy artykuł zawiera opis przeprowadzonego eksperymentu identyfikacyjnego dla sztucznej komory serca POLVAD-MEV oraz opracowanych algorytmów wykrywania stanu całkowitego napełnienia oraz wyrzutu z komory krwistej tego urządzenia. Przedstawiono metody diagnostyczne bazujące na różnych sygnałach wejściowych oraz ich implementację w programie symulacyjnym PExSim. Zawarto oraz omówiono uzyskane wyniki oraz opracowano wnioski dotyczące poszczególnych metod wyznaczania stanów granicznych napełnienia komory.

EN

The paper presents an identification experiment for the POLVAD-MEV artificial heart and the developed detection algorithms for complete filling and full emptying the device blood chamber. In Section 1 the subject is presented and the problem of thrombus formation, as a result of incomplete range of the assist device membrane motion, is discussed. Section 2 presents the research methodology. In Subsection 2.1 the ventricle assist device construc-tion (Fig. 1) and the test bench are described. The stand consists of a hybrid model of the circulatory system [10] with attached POLVAD device and the following measuring equipment: ultrasonic flow measurements at the inlet and outlet cannula, pressure sensors at the inlet and outlet of the blood chamber and the air pressure in pneumatic drain. In Subsection 2.2 the impact of complete filling and full ejection on the transients of the measured values is dis-cussed (Fig. 2). Two algorithms for detection of complete filling and full ejection are presented. One of them is based on the analysis of pressure changes in the cannulas and pneumatic drain, the second one is based only on the pneumatic pressure variation. Section 3 presents the results of the diagnostic algorithm examination. The effectiveness of the proposed methods is compared. In the last section the obtained results are summarized and some proposals for further improvements are given when focusing on the development of diagnostic features based on analysis of the pneumatic pressure variation only.

2

Modeling of circulatory system with coronary circulation and the POLVAD ventricular assist device

Siewnicka A., Fajdek B., Janiszowski K.

Journal of Automation Mobile Robotics and Intelligent Systems

|

2012

|

Vol. 6, No. 4

7-12

EN

This paper presents an application of a numerical package for modeling and simulation of human circulatory system. The model includes a coronary circulation and the parallel heart assistance. The cases of the simulation of the proper and the pathology circulation conditions, such as left or right heart failure are shown. A description of the coronary circulation system is presented and obtained coronary sinus occlusion simulation results are included. An implementation of the whole package as a part of PExSim application is contained. The identification experiment for the ventricular assist device has been described and different methods of the artificial ventricle modeling are presented. An example of use of a fuzzy logic to presentation the dynamics of the POLVAD device is also included. Advantages of developed simulation platform are discussed.

3

Modelowanie układu krążenia z możliwością równoległego wspomagania pracy komór serca w pakiecie programowym PExSim

Golnik A., Fajdek B., Janiszowski K.

Pomiary Automatyka Robotyka

|

2010

|

R. 14, nr 11

100-105

PL

Niniejszy artykuł zawiera opis modelu układu krążenia wykonany w pakiecie programowym PExSim. Pozwala on na przeprowadzenie symulacji numerycznych pracy układu krążenia. Jest to celowe w wielu zagadnieniach badawczych, może być przydatne do celów testowania urządzeń wspomagających, jak i użyteczne w zastosowaniach edukacyjnych. Opisane zostały modele urządzenia wspomagającego pracę serca oraz poszczególnych elementów układu krążenia. Przedstawiono wyniki symulacji pracy układu krążenia dla stanów: fizjologicznego prawidłowego, patologicznego oraz przy wspomaganiu lewokomorowym.

EN

The paper presents a numerical model of human circulatory system implemented as a part of PExSim application. Individual components of the human circulatory system and ventricular assist device are described. The examples of typical application are presented and the results of simulations for healthy, pathological and pathological with heart support conditions are included.

4

Application of the PExSim package in identification of multi-dimensional model of a waste water treatment plant

Stachura M.

Pomiary Automatyka Kontrola

|

2009

|

R. 55, nr 3

156-159

EN

This paper presets a modern approach to the modelling of multi-dimensional industrial processes. A proposed methodology is focused on processes working in more or less complex technology environment and integrates different approaches for simulation of components of the investigated systems. It is realized in form of the elastic programmable software package. This kind of approach includes an application of mathematical models (derived from physical relations, parametric or others) implemented in a relevant software, that allows us to prepare simulations so as to explore process behaviours in many situations, especially critical ones. The key issue of this type of approach is to prepare a model that would approximate a process dynamics with a satisfactory quality. Therefore, in this paper the problem of fitting physical models described by a set of ordinary differential equations is considered. This type of models have a set of unknown parameters that have to be estimated so as a model could properly mimic and predict the process. A tool for optimizing models prepared in the PExSim is described and its capabilities are presented. At last, an application of the PExSim in modelling of industrial processes and models optimization is presented with the help of an example of a waste water treatment process. Furthermore, some procedures of the complex models optimization are proposed. As the final result of an optimization a waste water treatment process model is achieved. Example results for selected concentrations of contamination in treated sludge are presented.

PL

W artykule przedstawiono nowoczesne podejście do modelowania wielowymiarowych procesów przemysłowych oraz metod optymalizacji utworzonych modeli. W treści opisano narzędzia umożliwiające modelowanie oraz optymalizację wraz z przykładem ich zastosowania. Istotą prezentowanego podejścia jest możliwość elastycznego dostosowywania utworzonych pakietów programowych do potrzeb użytkownika.