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Open AccessFeature PaperArticle

Bond Graph Simulation of Error Propagation in Position Estimation of a Hydraulic Cylinder Using Low Cost Accelerometers

Department of Fluid Mechanics, LABSON, Technical University of Catalonia, Colom 7, 08222 Terrassa, Spain
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Energies 2018, 11(10), 2603; https://doi.org/10.3390/en11102603
Received: 2 September 2018 / Revised: 22 September 2018 / Accepted: 25 September 2018 / Published: 29 September 2018
(This article belongs to the Special Issue Energy Efficiency and Controllability of Fluid Power Systems 2018)
The indirect calculation from acceleration of transversal displacement of the piston inside the body of a double effect linear hydraulic cylinder during its operating cycle is assessed. Currently an extensive effort exists in the improvement of the mechanical and electronic design of the highly sophisticated MEMS accelerometers. Nevertheless, the predictable presence of measurement errors in the current commercial accelerometers is the main origin of velocity and displacement measurement deviations during integration of the acceleration. A bond graph numerical simulation model of the electromechanical system has been developed in order to forecast the effect of several measurement errors in the use of low cost two axes accelerometers. The level of influence is assessed using quality indicators and visual signal evaluation, for both simulations and experimental results. The obtained displacements results are highly influenced by the diverse dynamic characteristics of each measuring axis. The small measuring errors of a simulated extremely high performance sensor generate only moderate effects in longitudinal displacement but deep deviations in the reconstruction of piston transversal movements. The bias error has been identified as the source of the higher deviations of displacement results; although, its consequences can be easily corrected. View Full-Text
Keywords: bond graph; hydraulic cylinder; displacement; accelerometer; error bond graph; hydraulic cylinder; displacement; accelerometer; error
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Algar, A.; Codina, E.; Freire, J. Bond Graph Simulation of Error Propagation in Position Estimation of a Hydraulic Cylinder Using Low Cost Accelerometers. Energies 2018, 11, 2603.

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