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Sensors 2016, 16(9), 1552; doi:10.3390/s16091552

A Small Range Six-Axis Accelerometer Designed with High Sensitivity DCB Elastic Element

1
School of Technology, Beijing Forestry University, Beijing 100083, China
2
Engineering Training Center, Beihang University, Beijing 102206, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 19 May 2016 / Revised: 12 September 2016 / Accepted: 12 September 2016 / Published: 21 September 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2559 KB, uploaded 21 September 2016]   |  

Abstract

This paper describes a small range six-axis accelerometer (the measurement range of the sensor is ±g) with high sensitivity DCB (Double Cantilever Beam) elastic element. This sensor is developed based on a parallel mechanism because of the reliability. The accuracy of sensors is affected by its sensitivity characteristics. To improve the sensitivity, a DCB structure is applied as the elastic element. Through dynamic analysis, the dynamic model of the accelerometer is established using the Lagrange equation, and the mass matrix and stiffness matrix are obtained by a partial derivative calculation and a conservative congruence transformation, respectively. By simplifying the structure of the accelerometer, a model of the free vibration is achieved, and the parameters of the sensor are designed based on the model. Through stiffness analysis of the DCB structure, the deflection curve of the beam is calculated. Compared with the result obtained using a finite element analysis simulation in ANSYS Workbench, the coincidence rate of the maximum deflection is 89.0% along the x-axis, 88.3% along the y-axis and 87.5% along the z-axis. Through strain analysis of the DCB elastic element, the sensitivity of the beam is obtained. According to the experimental result, the accuracy of the theoretical analysis is found to be 90.4% along the x-axis, 74.9% along the y-axis and 78.9% along the z-axis. The measurement errors of linear accelerations ax, ay and az in the experiments are 2.6%, 0.6% and 1.31%, respectively. The experiments prove that accelerometer with DCB elastic element performs great sensitive and precision characteristics. View Full-Text
Keywords: six-axis accelerometer; parallel mechanism; double cantilever beam; sensitivity analysis six-axis accelerometer; parallel mechanism; double cantilever beam; sensitivity analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sun, Z.; Liu, J.; Yu, C.; Zheng, Y. A Small Range Six-Axis Accelerometer Designed with High Sensitivity DCB Elastic Element. Sensors 2016, 16, 1552.

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