Investigation of MEMS as accelerometer sensor in an Implantable Centrifugal Blood Pump prototype
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(2020) 42:487
TECHNICAL PAPER
Investigation of MEMS as accelerometer sensor in an Implantable Centrifugal Blood Pump prototype S. Silva Neto1,2 · J. R. C. Sousa Sobrinho3,4 · C. da Costa3 · T. F. Leão3 · S. A. M. M. Senra2 · E. G. P. Bock3 · G. A. Santos3 · S. T. Souza1 · D. M. Silva2 · C. Frajuca3 · M. A. Souza3 Received: 10 October 2019 / Accepted: 7 August 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract Microelectromechanical systems (MEMS) accelerometers have applications in many fields based on the measurement of Cartesian components of the gravitational acceleration vector. Miniaturized MEMS have low power consumption and adequate response to dynamic acceleration. In order to detect thrombus inside blood pumps, an experimental setup was assembled with the MEMS accelerometer sensor (ADXL335, Analog Devices, Norwood). This detector should contribute to a recent study of fault diagnosis in an Implantable Centrifugal Blood Pump (ICBP) using vibrational analysis for detection of thrombus adhered in the pump’s rotor. This work proposes to verify the performance of the experimental data acquisition system developed with the MEMS accelerometer sensor in the vibrational analysis of ICBP. For this, a comparison between the vibrational spectra obtained by the MEMS acquisition system and the commercial type Vaibro® Vibrational Analyzer and Field Balancer (Rozh—VaibroSmart CH1 model) is made. Tests were carried out with different pump speeds in a mock loop, at this stage, without thrombus simulation. The vibrational spectra were plotted on graphs for analysis of their harmonic components, based on the fast Fourier transform. The spectral features for each speed of the pump rotor are compared and discussed. The experiment shows that the MEMS accelerometer sensor has better efficiency in detecting harmonics in the range from ≈ 50 to ≈ 150 Hz, at speeds greater than 1200 rpm, suggesting that MEMS can detect thrombi in ICBP. Keywords Accelerometer · Vibrational analysis · MEMS · Vibration · Polymeric ceramic bearing · Implantable Centrifugal Blood Pump · Ventricular assist device · Fast Fourier transform
1 Introduction Microelectromechanical systems (MEMS) accelerometers are high-impact commercial devices with application in various fields. Its creation was motivated by the advancement of the automobile industry to meet the airbag technology, Technical Editor: Wallace Moreira Bessa. * M. A. Souza [email protected] S. Silva Neto [email protected]
keeping as main use at industrial automaker, according to Garrison and Osiander [1]. The commercial accelerometers are based on measurement of Cartesian components of the gravitational acceleration vector, commonly found in the market as inclination sensors [2], technology that allowed the creation of miniaturized sensors, which offer good response to dynamic acceleration resulting from movement, low energy demand, low excitation voltage, and low 2
Departamento de Mecanica de Precisao, Faculdade de Tecnologia de Sao
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