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EXPERIMENTAL DETERMINATION OF RIGID BODY PROPERTIES: AN EVALUATION ON THE USE OF PIEZOELECTRIC OR MEMS TRI-AXIAL ACCELEROMETERS
Last modified: 2017-12-19
Abstract
The recent and rapid development of new vibration sensors that are available at low and accessible prices has made possible their use on common studies of dynamic structures. One of these studies is the experimental determination of rigid body properties that are mandatory when the vibration response is to be calculated at low frequency ranges.
In this work a comparison of the experimental determination of rigid body properties is carried out to evaluate the performance of the common used tri-axial piezoelectric accelerometers and their equivalent modern MEMS sensors. Although their prices are quite different, both sensors are able to measure the inertia restraint line that is related to the inertia properties of the tested object. An identification algorithm is applied to the frequency response functions obtained by using both sensors, leading to the estimation of the body mass value, as well as the three coordinates of the center of mass and the six elements of the inertia tensor.
In this work a comparison of the experimental determination of rigid body properties is carried out to evaluate the performance of the common used tri-axial piezoelectric accelerometers and their equivalent modern MEMS sensors. Although their prices are quite different, both sensors are able to measure the inertia restraint line that is related to the inertia properties of the tested object. An identification algorithm is applied to the frequency response functions obtained by using both sensors, leading to the estimation of the body mass value, as well as the three coordinates of the center of mass and the six elements of the inertia tensor.