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

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          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 a x , a y and a z 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.

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          A Platform with Six Degrees of Freedom

          D. Stewart (2016)
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            In vivo evaluation of wearable head impact sensors

            , , (2015)
            Inertial sensors are commonly used to measure human head motion. Some sensors have been validated with dummy or cadaver experiments, but methods to evaluate sensors in vivo are lacking. Here we present an in vivo method using high speed video to evaluate teeth-mounted (mouthguard), soft tissue-mounted (skin patch), and headgear-mounted (skull cap) sensors during 6-13g sagittal soccer head impacts. Sensor coupling to the skull is quantified by displacement from an ear-canal reference. Mouthguard displacements were within video measurement error (<1mm), while the skin patch and skull cap displaced up to 4mm and 13mm from the ear-canal reference, respectively. We used the mouthguard, which had the least displacement from skull, as the reference to assess 6-degree-of-freedom skin patch and skull cap measurements. Linear and rotational acceleration magnitudes were over-predicted by both the skin patch (with 120% NRMS error for a_mag, 290% for alpha_mag) and the skull cap (320% NRMS error for a_mag, 500% for alpha_mag). Such over-predictions were largely due to out-of-plane motion. To model sensor error, we found that in-plane acceleration peaks from the skin patch in the anterior-posterior direction could be modeled by an underdamped viscoelastic system. In summary, the mouthguard showed tighter skull coupling in vivo than the other sensors. Furthermore, the in vivo methods presented are valuable for investigating skull acceleration sensor technologies.
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              A general dynamics and control model of a class of multi-DOF manipulators for active vibration control

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                Author and article information

                Contributors
                Role: Academic Editor
                Journal
                Sensors (Basel)
                Sensors (Basel)
                sensors
                Sensors (Basel, Switzerland)
                MDPI
                1424-8220
                21 September 2016
                September 2016
                : 16
                : 9
                : 1552
                Affiliations
                [1 ]School of Technology, Beijing Forestry University, Beijing 100083, China; szbandlzl@ 123456bjfu.edu.cn (Z.S.); ycz_vicky@ 123456bjfu.edu.cn (C.Y.); zhengyili@ 123456bjfu.edu.cn (Y.Z.)
                [2 ]Engineering Training Center, Beihang University, Beijing 102206, China
                Author notes
                [* ]Correspondence: liujinhao@ 123456bjfu.edu.cn ; Tel.: +86-135-5227-6090
                Article
                sensors-16-01552
                10.3390/s16091552
                5038822
                27657089
                85c5fba6-cf15-4648-8989-21d63addb5e7
                © 2016 by the authors; licensee MDPI, Basel, Switzerland.

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 19 May 2016
                : 12 September 2016
                Categories
                Article

                Biomedical engineering
                six-axis accelerometer,parallel mechanism,double cantilever beam,sensitivity analysis

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