Design principles for a single-process 3d-printed accelerometer

date: 08.12.2020

category: Sporočila za javnost

 

Researchers of the Faculty of Mechanical Engineering developed and manufactured uni-axial piezoresistive accelerometer using 3d printing technology. Developed accelerometer was presented in Mechanical Systems and Signal Processing (IF=6.471) which is one of the world-leading journal for sensing, instrumentation, signal processing and modelling of dynamic systems. Developed accelerometer can be manufactured, used and further developed by large variety of users, due to simple manufacturing process and wide accessibility of 3d printing machines

Recent research showed that fused-filament fabrication could also be used for the manufacturing of dynamic sensors based on piezoresistivity (strain dependent electrical resistivity). However, the anisotropic mechanical and piezoresistive behaviour, the heterogeneity, the large number of process parameters and the large number of possible geometrical designs open up numerous design options for manufacturing. Additionally, a small size is difficult to achieve due to the relatively low resolution of fused-filament fabrication.

In order to understand the frequency, the material and the geometrical influences of the piezoresistive accelerometer with a beam-shaped sensing element and an attached inertial mass, researchers of Faculty of mechanical engineering developed an analytical accelerometer model based on a Bernoulli-Euler beam theory. With the help of the analytical model, small-sized (22x22x15 mm^3), single-axis, prototype accelerometer, with an approximately linear response up to-425 Hz and a low cross-axis sensitivity was manufactured.

Presented results can be used for further optimization of the developed prototype sensor and as a foundation for the derivation of design principles for other types of fused-filament fabricated accelerometers.

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