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Aspectos metodológicos da aferição de atividade física em crianças de 7 a 10 anos de idade por meio do acelerômetro: revisão sistemática da literatura; Methodological aspects of physical activity measurement in 7-10 years old children by means of accelerometer: a systematic literature review

Rodrigues, Eduardo Quieroti
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 28/02/2013 PT
Relevância na Pesquisa
37.35%
Introdução: Estudos mostram a importância de quantificar a atividade física e sua associação no processo saúde-doença. Esta tarefa não é simples, principalmente em crianças, por constituir um construto multidimensional que envolve atividades realizadas no lazer, em ambientes educacionais, vinculadas à ocupação e ao transporte. O acelerômetro está em destaque nos estudos epidemiológicos com adultos e crianças nos quais existe interesse na aferição de atividade física. Objetivo: Explorar aspectos metodológicos na aferição de atividade física por meio de acelerômetro em crianças de 7 a 10 anos. Metodologia: Estudo de revisão sistemática de trabalhos selecionados segundo passos pré-definidos: critérios de inclusão dos estudos; estratégia de busca; critérios para avaliação de qualidade dos estudos identificados; informações a serem extraídas. Entre as características de interesse estão as relacionadas à tecnologia do equipamento, à utilização, à população e às medidas de aferição. Resultados: Foram localizados 872 trabalhos nas 4 bases de dados (Pubmed, Embase, SPORTDiscus, Lilacs). Foram incluídos na revisão 68 estudos com qualidade metodológica. Foi constatada a predominância de utilização de acelerômetros uniaxiais da marca Actigraph® (Modelos: GT1M; 7164)...

Exercise intervention in treatment-resistant major depressive disorder : benefits of accelerometer monitoring

Mota-Pereira, Jorge; Ribeiro, José Carlos; Fonte, Daniela; Carvalho, Serafim; Ramos, Joaquim; Silvério, Jorge Manuel Amaral
Fonte: Nova Science Publishers Publicador: Nova Science Publishers
Tipo: Parte de Livro
Publicado em //2013 ENG
Relevância na Pesquisa
37.11%
Although there are several reports on the benefits of exercise on Major Depressive Disorder, none has monitored these exercise programs with accelerometers. We have conducted a 12 week home based moderate intensity exercise program in 33 treatmentresistant Major Depressive Disorder patients and, based on accelerometer data, determined compliance, exercise patterns and relationship between time spent in MVPA, response to treatment and Quality of Life. Patients were diagnosed according to DSM-IV criteria, and, from 150 initially screened, 33 met study criteria and were included. Four patients were excluded due to non-compliance/drop-out, thus a total of 29 patients finished the study. Patients were randomized either to a moderate intensity exercise program, which consisted of 30-45 min/day walks, 5 days/week, for 12 weeks, plus usual pharmacotherapy (N=22) or regular daily activities plus usual pharmacotherapy (N=11). All participants wore an ActiGraph® GT1M accelerometer during the 12 weeks. Moderate to very vigorous physical activity (MVPA), HAMD17, BDI, GAF, CGI-S, WHOQOL-Bref and SF-36 were assessed. Results show a trend for increasing time spent in MVPA from no response to response and remission (p = 0.028)...

Uniaxial fiber Bragg grating accelerometer system with temperature and cross axis insensitivity

Antunes, Paulo; Varum, Humberto; André, Paulo
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.22%
In this paper we describe the implementation and test of an optical fiber based accelerometer with cross axis insensitivity. The accelerometer uses two matching fiber Bragg gratings which are also responsible by the demodulation of the wavelength encoded information. The accelerometer was tested in a reinforced concrete slab, of a 3-storey building located at the University of Aveiro, Portugal. A maximum error of 0.25% for the slab eigenfrequencies was obtained when compared with the values acquired by an electronic sensor. (C) 2010 Elsevier Ltd. All rights reserved.; FCT - SFRH/BD/41077; FCT - SFRH/BSAB/939/2009

Optical fiber accelerometer system for structural dynamic monitoring

Antunes, Paulo Fernando da Costa; Lima, Hugo F. T.; Alberto, Nelia Jordão; Rodrigues, Hugo; Pinto, Pedro M. F.; Pinto, João de Lemos; Nogueira, Rogerio N.; Varum, Humberto; Costa, Aníbal G.; André, Paulo Sérgio
Fonte: IEEE Publicador: IEEE
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.96%
In this study, the implementation of an optical accelerometer unit based on fiber Bragg gratings, suitable to monitor structures with frequencies up to 45 Hz, is reported. The developed optical system was used to estimate the structure eigenfrequencies of a steel footbridge, with a total length of 300 m, over the Sao Pedro Creek, located at University of Aveiro Campus, in Portugal. The acceleration records measured with this solution are compared with those obtained by traditional commercial electronic devices, revealing a root-mean-square error of 2.53 x 10(-5) G.

Dynamic monitoring of a mobile telecommunications tower with a bi-axial optical FBG accelerometer

Antunes, Paulo; Travanca, Rui; Varum, Humberto; Andre, Paulo
Fonte: SPIE Publicador: SPIE
Tipo: Conferência ou Objeto de Conferência
ENG
Relevância na Pesquisa
36.96%
In this work, the structural health monitoring of a self-supported steel tower with 50 meters high used for mobile communications are presented. For this test, a fiber Bragg grating based biaxial horizontal accelerometer was used to obtain the structure frequencies. The frequencies for the first resonant modes were obtained from the acceleration data recorded over time, resulting from the application of mechanical horizontal impulses on the tower. The results shown that the frequencies measured in both directions are within the values expected for this type of structure and can be used to calibrate numerical models that represent their structural behavior.; FCT; SFRH/BD/41077/2007

Biaxial optical accelerometer and high-angle inclinometer with temperature and cross-axis insensitivity

Antunes, P.; Marques, C.; Varum, H.; André, P.
Fonte: Institute of Electrical and Electronics Engineers (IEEE) Publicador: Institute of Electrical and Electronics Engineers (IEEE)
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.96%
In this paper, we describe the implementation and test of an optical fiber biaxial accelerometer and inclinometer based on fiber Bragg gratings. The proposed sensor is a low cost and simple solution to measure acceleration and relative rotation in two orthogonal directions, which can be used for structural health monitoring. Sensitivities of 87.848 and 92.351 pm.g−1, for each sensitive direction with resonant frequencies of 846.01 and 845.33 Hz, respectively, are achieved. For the inclinometer, the tilt sensitivities are 1.43 ± 0.03 and 1.38 ± 0.03 pm/º for each orthogonal sensitive direction for angular rotations smaller than 45º. For inclinations higher than 45º, a suitable calibration expression is presented.

Intensity-encoded polymer optical fiber accelerometer

Antunes, P. F. C.; Varum, H.; André, P. S.
Fonte: Institute of Electrical and Electronics Engineers (IEEE) Publicador: Institute of Electrical and Electronics Engineers (IEEE)
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.22%
In this paper, we report the development and experimental implementation of a low-cost, compact, intensity-encoded accelerometer based on polymer optical fibers (POF). The proposed accelerometer sensor element relies on the misalignment between two POFs, being the external acceleration encoded in the optical signal intensity. The accelerometer performance was optimized by simulation, resulting in a coupling efficiency and modulation index values of 0.38 and 1.78, respectively. The implemented device has a sensitivity of 33.5 +/- 0.1 mV/g and a resonant frequency of 51.44 +/- 0.1 Hz, obtained for a signal to noise ratio of 20 dB. This value for the resonant frequency is suitable for applications in several fields, such as structural health monitoring of civil engineering structures.

Testing a 3-axis accelerometer acoustic transmitter (AccelTag) on the Lusitanian toadfish

Almeida, Pedro R.; Pereira, Tadeu; Quintella, Bernardo; Gronningsaeter, Aage; Costa, Maria José; Costa, José Lino
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.29%
A consortium composed of Thelma Biotel and Center of Oceanography developed and tested an acoustic 3-axis accelerometer transmitter. The first testing phase took place in experimental tanks and consisted of externally attaching prototype data logging tags in Lusitanian toadfish (Halobatrachus didactylus Bloch & Schneider, 1801) and comparing raw logged data with observed behaviours to obtain characteristic accelerometer data patterns that could be assigned to those typicalmovements. Four behavioural “signatures”were considered, two different burrowing movements, attack towards a prey and general activity. The second phase was the development of a prototypewith integrated software capable of identifying those accelerometer typical patterns, process the information and transmit relevant data acoustically. Burrowingmovements and activity were detected and transmittedwith 100% accuracywhile attackswere detectedwith a 61% successful rate. The third phase took place in the Mira estuary (SWPortugal)with 2 groups (five and six individuals each) of free living toadfish to test the codified acoustic signal transfer from the AccelTag to the acoustic receiver array. The novelty of the AccelTag is that is has themeasuring capabilities of an accelerometer archival tag butwithout the necessity of recapture the tagged fish...

Design and Implementation of a Micromechanical Silicon Resonant Accelerometer

Huang, Libin; Yang, Hui; Gao, Yang; Zhao, Liye; Liang, Jinxing
Fonte: Molecular Diversity Preservation International (MDPI) Publicador: Molecular Diversity Preservation International (MDPI)
Tipo: Artigo de Revista Científica
Publicado em 19/11/2013 EN
Relevância na Pesquisa
27.42%
The micromechanical silicon resonant accelerometer has attracted considerable attention in the research and development of high-precision MEMS accelerometers because of its output of quasi-digital signals, high sensitivity, high resolution, wide dynamic range, anti-interference capacity and good stability. Because of the mismatching thermal expansion coefficients of silicon and glass, the micromechanical silicon resonant accelerometer based on the Silicon on Glass (SOG) technique is deeply affected by the temperature during the fabrication, packaging and use processes. The thermal stress caused by temperature changes directly affects the frequency output of the accelerometer. Based on the working principle of the micromechanical resonant accelerometer, a special accelerometer structure that reduces the temperature influence on the accelerometer is designed. The accelerometer can greatly reduce the thermal stress caused by high temperatures in the process of fabrication and packaging. Currently, the closed-loop drive circuit is devised based on a phase-locked loop. The unloaded resonant frequencies of the prototype of the micromechanical silicon resonant accelerometer are approximately 31.4 kHz and 31.5 kHz. The scale factor is 66.24003 Hz/g. The scale factor stability is 14.886 ppm...

A New Z-axis Resonant Micro-Accelerometer Based on Electrostatic Stiffness

Yang, Bo; Wang, Xingjun; Dai, Bo; Liu, Xiaojun
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
Publicado em 05/01/2015 EN
Relevância na Pesquisa
27.42%
Presented in the paper is the design, the simulation, the fabrication and the experiment of a new z-axis resonant accelerometer based on the electrostatic stiffness. The new z-axis resonant micro-accelerometer, which consists of a torsional accelerometer and two plane resonators, decouples the sensing movement of the accelerometer from the oscillation of the plane resonators by electrostatic stiffness, which will improve the performance. The new structure and the sensitive theory of the acceleration are illuminated, and the equation of the scale factor is deduced under ideal conditions firstly. The Ansys simulation is implemented to verify the basic principle of the torsional accelerometer and the plane resonator individually. The structure simulation results prove that the effective frequency of the torsional accelerometer and the plane resonator are 0.66 kHz and 13.3 kHz, respectively. Then, the new structure is fabricated by the standard three-mask deep dry silicon on glass (DDSOG) process and encapsulated by parallel seam welding. Finally, the detecting and control circuits are designed to achieve the closed-loop self-oscillation, to trace the natural frequency of resonator and to measure the system frequency. Experimental results show that the new z-axis resonant accelerometer has a scale factor of 31.65 Hz/g...

A method comparison of force platform and accelerometer measures in jumping.

Howard, Róisín M; Healy, Robin; Conway, Richard; Harrison, Andrew J.
Fonte: International Society of Biomechanics in Sport Publicador: International Society of Biomechanics in Sport
Tipo: info:eu-repo/semantics/conferenceObject; all_ul_research
ENG
Relevância na Pesquisa
37.22%
peer-reviewed; The purpose of this study was to compare force calculated using accelerometer data from the SHIMMER device, with force platform data on countermovement and drop jumps. Twelve physically active adults performed 5 counter movement jumps and 5 drop jumps from a height of 0.30 m. An accelerometer was attached near the participant’s centre of mass and simultaneous force and acceleration data were obtained for the jumps. Minimum eccentric force and peak concentric force were calculated concurrently for countermovement jumps and peak landing forces were calculated concurrently for drop jumps. The results showed moderate to poor levels of agreement in forces and a consistent systematic bias between the results from the force platform and accelerometer.; PUBLISHED; peer-reviewed

Estimation of force during vertical jumps using body fixed accelerometers

Howard, Róisín M; Conway, Richard; Harrison, Andrew J.
Fonte: The Institution of Engineering and Technology Publicador: The Institution of Engineering and Technology
Tipo: info:eu-repo/semantics/conferenceObject; all_ul_research; ul_published_reviewed
ENG
Relevância na Pesquisa
27.42%
peer-reviewed; A method of estimating force using an accelerometer is presented. This model is based on estimating the resultant acceleration of a body at its centre of mass using a triaxial accelerometer. A data set of ground reaction forces are gathered using a force platform, which is used as the control for this experiment. Signal processing techniques for resampling the accelerometer signals, along with a method of cross correlation to align the force platform and accelerometer traces are used. The purpose of this study was to compare force calculated using accelerometer data from the SHIMMER device, with force platform data on counter movement and drop jumps, for use in sports biomechanics. The method was validated using twelve physically active adults who performed 5 counter movement jumps and 5 drop jumps from a height of 0.30 m. An accelerometer was attached near the participant’s centre of mass and simultaneous force and acceleration data were obtained for the jumps. Minimum eccentric force and peak concentric force were calculated concurrently for countermovement jumps and peak landing forces were calculated concurrently for drop jumps. The results showed moderate to low levels of agreement in forces and a consistent systematic bias between the results from the force platform and accelerometer. However...

Micro-g MEMS accelerometer based on time measurement

Dias, Rosana Maria Alves
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Tese de Doutorado
Publicado em 27/05/2012 ENG
Relevância na Pesquisa
37.39%
Programa Doutoral em Engenharia Electrónica e de Computadores; The MEMS sensor market has experienced an amazing growth on the last decades, with accelerometers being one of the pioneers pushing the technology into widespread use with its applications on automotive industry. Since then, accelerometers have been gradually replacing conventional sensors due mainly to its lower cost. As the performance of MEMS accelerometers improves, the applications range where they replace conventional accelerometers increases. Nowadays, there is still a large range of applications for which suitable MEMS accelerometers are yet to be developed. This work focuses on the development of a high performance accelerometer taking advantage of the high sensitivity of a non-linear phenomenon that occurs in electrostatically actuated movable capacitive microdevices: electrostatic pull-in. Although the pull-in effect has been known for more than 40 years, it is usually avoided when dealing with movable microstructures as it leads to a region of instability, where the position of movable parts cannot be fully controlled. In the last decade, the pull-in displacement profile of 1-DOF parallel-plates devices has been the subject of research that revealed the presence of a so-called meta-stability. This meta-stability occurs in specific damping and voltage actuation conditions and translates as a non-linear displacement profile...

An evaluation of patients with anterior cruciate ligament reconstruction with an accelerometer and the step-up-and-over test

Bailey, Christopher
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
EN; EN
Relevância na Pesquisa
37.42%
Evaluating patient knee function after anterior cruciate ligament reconstruction (ACLR) can be difficult. With current evaluation methods, some patients are unable to return to their previous level of physical activity and if they do, they have a high risk of re-injury. One reason for these poor outcomes could be a lack of evaluation options in the clinic. Clinical evaluations require inexpensive and objective tests that have low physical demand. One objective and low demand test is the step-up-and-over (SUAO). Presently, the test uses a force plate, an expensive device. Replacing the force plate with an accelerometer could make the SUAO test an inexpensive evaluation tool of ACLR patients. Therefore, this thesis had three objectives. First, to discover if an accelerometer is a valid alternative to a force plate for the SUAO test. Second, to determine if the accelerometer-modified SUAO test is performed differently by ACL-intact individual and ACLR patients. Third and final, to determine if a relationship exists between SUAO test performance and subjective knee function. Two studies were completed for this thesis. In the first study, 17 ACL-intact individuals completed the SUAO test while being measured with a force plate and an accelerometer. In the second study...

ROTATION ENCODING OF C-ARM FLUOROSCOPES WITH ACCELEROMETER

GRZEDA, VICTOR
Fonte: Quens University Publicador: Quens University
Tipo: Tese de Doutorado
EN; EN
Relevância na Pesquisa
37.22%
Accurate, practical, and affordable pose tracking on manually operated C-arm fluoroscopes is a major technical challenge. Conventional tracking methods, such as optical cameras and radiographic fiducials, are hampered by significant shortcomings. Optical cameras are delicate, costly, and have a complex system setup that is easily susceptible to camera obstruction in cluttered operating room. Radiographic fiducials occupy a significant portion of the fluoroscopic imaging space. Using fiducials also requires segmentation that limits clinical use. In this thesis, an alternative form of tracking is proposed to encode the rotational joints of manually operated C-arms using a tilt sensing accelerometer for tracking the C-arm rotational pose. The technique is evaluated by affixing an accelerometer to a full-scale C-arm where a webcam is used as a substitute for X-ray imaging. Ground truth C-arm rotational poses were obtained from the webcam by tracking a checkerboard plate. From these rotational poses, a series of angle and structural correction equations were formulated that can properly relate the accelerometer angle readings to the C-arm rotational pose in real-time and compensate for systematic structural C-arm deformations...

Elevated water reservoir monitoring using optical fiber accelerometer

Antunes, P. F. C.; Rodrigues, H. F. P.; Varum, H.; André, P. S. B.
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.96%
Structural health monitoring is defined as the structural behavior surveillance during a predetermined time or throughout the structure's lifetime, in order to detect materials or structural degradation. Periodical measurements can detect changes in the natural frequencies of the structure, and indicate the structural damage or deterioration. In this work, we experimentally demonstrated the use of a fiber Bragg grating-based biaxial accelerometer in dynamic measurements on an elevated reinforced concrete water reservoir. This elevated water reservoir structure was suitable to be used as a demonstration of the application of optical accelerometers in the structure natural frequencies measurement, under environmental excitation. The obtained experimental values for first natural frequency in the transverse and longitudinal directions were 0.805 Hz and 0.903 Hz, respectively. These values present a relative error smaller than 0.5% when compared with that obtained by the structure numerical simulation.

State estimation filtering algorithms for vehicle attitude determination using a dual-arc accelerometer array and 3-axis rate gyroscopes

Zimmerman, Aaron
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
37.22%
Sensor measurements are corrupted by biases, noise and drift effects and, in order to provide accurate measurements, these errors need to be estimated and, thus, eliminated. The current model used an Extended Kalman filter for the estimation of rate gyroscope measurement errors. This work improves upon that filter by applying a more robust, more accurate and more reliable Unscented Kalman filter. In addition, an algorithm for estimating the accelerometer measurement errors is developed using control theory. Using the attitude estimate from the Unscented Kalman filter, an error signal is formed between that attitude and the attitude estimates from the accelerometer array(s). This error signal is then reduced by implementation of an innovative method using PID controllers to estimate, and reduce the effects of, accelerometer measurement errors. While this thesis uses a previously developed device and equations, it is a departure from the previous works as it considers parameters and variables that were ignored in those studies.

Acelerômetro eletrônico e a placa Arduino para ensino de física em tempo real; Properties of an electronic accelerometer and the possible uses in Mechanics teaching

Rocha, Fábio Saraiva da; Universidade Federal de Pelotas - Centro de desenvolvimento Tecnológico (CDTec); Maranghello, Guilherme Frederico; Universidade Federal do Pampa, Campus Bagé; Lucchese, Márcia Maria; Universidade Federal do Pampa, Campus Bagé
Fonte: Imprensa Universitária - UFSC Publicador: Imprensa Universitária - UFSC
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 25/11/2013 POR
Relevância na Pesquisa
37.22%
http://dx.doi.org/10.5007/2175-7941.2014v31n1p98Apresenta-se o projeto de um acelerômetro eletrônico triaxial voltado ao ensino de física experimental. Este dispositivo, quando acoplado adequadamente a um corpo, permite a leitura da aceleração imprimida ao conjunto. O acelerômetro funciona conectado eletronicamente à placa Arduíno sendo capaz de fornecer dados numéricos de aceleração que atualizam no decorrer de uma experiência. Tais dados podem ser disponibilizados através de tabelas e gráficos em tempo real quando do uso concomitante da ferramenta de aquisição de dados PLX-DAQ e a planilha eletrônica Excel (Física em Tempo Real – FTR). Apresentamos, inicialmente, as características operacionais do módulo acelerômetro MM7361, aspectos gerais da placa Arduíno e detalhamos a programação computacional envolvida no projeto como um todo. Em seguida, discutimos algumas possibilidades de uso deste dispositivo em práticas de ensino propostas para serem reproduzidas em um laboratório didático de física experimental. O uso do acelerômetro em questão se mostra promissor para ser utilizado em diversas práticas de ensino de física, seja objetivando a inovação no laboratório didático, pela possibilidade de utilizar o recurso da FTR com uma classe demonstrativa...

Preliminary evidence of physical activity levels measured by accelerometer in Spanish adolescents: The AFINOS Study

Martínez-Gómez,D.; Welk,G. J.; Calle,M. E.; Marcos,A.; Veiga,O. L.
Fonte: Nutrición Hospitalaria Publicador: Nutrición Hospitalaria
Tipo: info:eu-repo/semantics/article; journal article; info:eu-repo/semantics/publishedVersion Formato: text/html; application/pdf
Publicado em 01/04/2009 ENG
Relevância na Pesquisa
37.22%
Background: It is necessary to know the levels of physical activity (PA) for a better understanding of the development of chronic diseases in youth. The aim of this study was to assess levels of total PA and time spent in different PAintensities in Spanish adolescents by accelerometer. Methods: A sub-sample of 214 healthy Spanish adolescents (107 females), aged 13-16 years, enrolled in the AFINOS Study was selected for this study. Participants wore the ActiGraph GT1M accelerometer for 7 consecutive days. Total PA and time spent in sedentary, light, moderate, vigorous, and moderate to vigorous physical activity (MVPA) was estimated using the accelerometer. Adiposity was measured in the sample using sum of 6 skinfoldthickness, waist circumference and BMI. Results: Adolescent boys were engaged in higher levels of total PA, moderate PA, vigorous PA and MVPA than adolescent girls, whereas girls were engaged in higher levels of light PA. Differences between age groups showed that the 15-16 years group did more total PA (P = 0.008) than the 13-14 years group. Adolescents with highest levels of body fat were less active and spent less time in vigorous PA and MVPA than adolescents with less body fat. Among the current sample, 71.1% of the adolescents (82.2% adolescent boys and 60.7% adolescent girls) reached the recommendation of ≥ 60 min in MVPA. Conclusions: Although these findings suggest that Spanish adolescents have similar PA levels than other European adolescents...

Capacitive MEMS accelerometer wide range modeling using artificial neural network

Baharodimehr,A.; Abolfazl Suratgar,A.; Sadeghi,H.
Fonte: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico Publicador: UNAM, Centro de Ciencias Aplicadas y Desarrollo Tecnológico
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2009 EN
Relevância na Pesquisa
37.22%
This paper presents a nonlinear model for a capacitive microelectromechanical accelerometer (MEMA). System parameters of the accelerometer are developed using the effect of cubic term of the folded-flexure spring. To solve this equation, we use the FEA method. The neural network (NN) uses the Levenberg-Marquardt (LM) method for training the system to have a more accurate response. The designed NN can identify and predict the displacement of the movable mass of accelerometer. The simulation results are very promising.