Tesi sul tema "Triaxial accelerometer"
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1
MORIKAWA, SERGIO RICARDO KOKAY. "TRIAXIAL BRAGG GRATING ACCELEROMETER". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5413@1.
Testo completoAbstract (sommario):
AGÊNCIA NACIONAL DE PETRÓLEOTRANSMISSÃO DE ENERGIA ELÉTRICA S.A
Desde o final da década de 80 a indústria de fibras óticas têm passado por avanços consideráveis. Através de técnicas controladas, as fibras ópticas podem gerar sinais associados a uma vasta gama de grandezas físicas funcionando como sensores denominados de Sensores a Fibra Óptica (SFO s). Diversas técnicas podem ser empregadas para tal, e entre as existentes a baseada em redes de Bragg é a que mais tem se destacado. O interesse por transdutores empregando esta técnica se justifica pelas vantagens proporcionadas pelo uso da luz, tais como sua capacidade de multiplexação, boa relação sinal/ruído, medições a longas distâncias, imunidade a campos eletromagnéticos, ausência de faísca, entre outras. Neste trabalho buscou-se desenvolver um transdutor e uma técnica de medição baseada em sensores a rede de Bragg para medição de vibrações mecânicas. Um acelerômetro óptico triaxial é projetado e construído. Diferentes modelos foram testados em busca das características de desempenho desejadas. Simulações numéricas empregando o método dos elementos finitos auxiliaram na decisão por melhores desenhos para o transdutor. Resultados de testes experimentais e calibrações empregando um sistema de aquisição de sinais desenvolvido são mostrados. Medições de longa duração para avaliação de estabilidade do sistema e efeitos de temperatura também são apresentados.
Since the end of the 1980s, the fiber optics industry has experienced considerable advances. Through a number of controlled techniques, fiber optics can generate signals associated with a vast array of physical measures, working as sensors denominated Optical Fiber Sensors (OFS s). Many different techniques can be employed to achieve this objective. Among these, the one based on Bragg networks has received the greatest amount of attention. The interest in transducers employing this technique is justified by the advantages of using light, such as its multiplexing capability, good signal-to-noise ratio, possibility of long distance measurements, immunity to electromagnetic fields, and absence of sparks. In the present work, a transducer and measurement technique based on Bragg network sensors vibration are developed, in order to measure mechanical vibrations. A triaxial optical accelerometer is designed and built. Different models are tested in the search for the desired performance characteristics. Numerical simulations employing the finite element method help the decision making process for better transducer designs. Results from experimental and calibration tests using a newly developed signal acquisition system are presented. Long duration measurements to evaluate system stability and temperature effects are also shown.
2
Mathie, Merryn Joy Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "Monitoring and interpreting human movement patterns using a triaxial accelerometer". Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2003. http://handle.unsw.edu.au/1959.4/27386.
Testo completoAbstract (sommario):
This thesis addresses the hypothesis that a single, waist-mounted triaxial accelerometer (TA) can be used to monitor human movement patterns in unsupervised, freeliving subjects over extended periods, and that it can be used to quantitatively measure parameters that can provide clinical insight into the health status of the subject. A rigorous theoretical and experimental understanding of the signals obtained from a TA is developed. The effect of the placement of the TA device on the waist is explored and a model relating device position to TA signal is developed for a range of postures and activities. A classification framework for movement identification using the signals from a waist-mounted TA is presented. This framework is based on a hierarchical binary processing tree and is designed for real time use. An implementation of this framework for monitoring housebound patients is presented. Algorithms for detecting falls, distinguishing between activity and rest, classifiying transitions between different postural orientations, and for identifying periods of standing, sitting, lying and walking are developed. In evaluation studies performed in controlled laboratory conditions, every algorithm performed with better than 90% accuracy. Once movements are identified, movement-specific parameters sensitive to changes in functional status are extracted from the signal. A two stage methodology for employing the accelerometry system in monitoring free-living subjects is introduced. The first stage involved monitoring specific movements through a directed routine. The second stage involved monitoring of free movement. Signals obtained from the directed routine are used to extract clinically relevant, movement-specific parameters. Signals obtained from the period of free movement are monitored for falls and other abnormal events. General parameters of movement, including energy expenditure, are also measured. The system was evaluated in a series of field studies in laboratory and home environments, in supervised and unsupervised settings, using cohorts of healthy subjects. A pilot trial was conducted in which six healthy elderly subjects wore the TA device for a period of up to three months. The technical performance and useability of the system were evaluated. Clinically significant parameters were measured and the effects of age and health status on the measured parameters were evaluated.
3
Elliott, Richard A. "A user interactive calibration program for an object tracking system using a triaxial accelerometer". Honors in the Major Thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1799.
Testo completoAbstract (sommario):
A major method in object tracking systems and other inertial measurement devices resolves around the use of one, two, or three axis accelerometers. A leader in the field such devices is Microstrain Incorporated. They have developed a three axis accelerometer that uses a three axis magnetic sensor array to compute the pitch, roll, and yaw of a compact inertial measurement unit. In researching such devices, it became apparent that data collected using such units is extremely sensitive both to local magnetic fields and human interactions with the devices. It is therefore of great importance to ensure the device or devices are properly calibrated. In the construction of an effective calibration program, it is necessary to measure and zero out even minor discrepancies, as even small misalignments have deleterious effects on device performance.Bachelors
Engineering and Computer Science
Computer Engineering
4
Peregino, Philip J. II, e Edward F. Bukowski. "DEVELOPMENT, EVALUATION AND IMPLEMENTATION OF A SURFACE-MOUNT, HIGH-G ACCELEROMETER". International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604516.
Testo completoAbstract (sommario):
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, NevadaThe Endevco model 7270A high-g accelerometer has been used successfully in numerous flight tests at the U.S. Army Research Laboratory. The accelerometer is available in ranges as low as 6,000 g’s up to 200,000 g’s so they can be used in a variety of situations to measure setback, set forward and balloting in artillery rounds, mortars and tank projectiles to name a few. However, one of the disadvantages of the model 7270A is its physical size, in the era of die level and surface mount components, the 7270A is relatively large. The sensing element is packaged inside a metal case with screw holes for mounting to a rigid surface. In addition, there are wires protruding from the case for electrical connections. In the area of munitions, small cavities don’t always afford the room for a large gauge. It was desirable to repackage the die in a smaller container and make it a surface mount component for a printed circuit board. A contract was developed for Endevco to repackage the die and to develop a tri-axial version with the repackaged die. The newly developed accelerometers were tested and evaluated by the U.S. Army Research Laboratory.
5
Robért, Bradley Duane. "Validation and implementation of a remote three-dimensional accelerometer monitoring system for evaluating behavior patterns in cattle". Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/4144.
Testo completoAbstract (sommario):
Master of ScienceDepartment of Clinical Sciences
Robert L. Larson
Bradley J. White
We performed research that investigated the ability of three dimensional accelerometers to classify cattle behavior and also describe the circadian patterns within that behavior. The first of three studies (validation study) tested a decision tree classification system and its ability to describe behaviors of lying, standing, and walking. Classification accuracies for lying, standing, and walking behaviors were 99.2%, 98.0%, and 67.8% respectively, with walking behavior having significantly lower accuracy (P<0.01). This study also tested the accuracy of classifying the above behaviors using different device reporting intervals, or epochs. Reporting intervals of 3, 5, and 10 seconds (s) were evaluated in their ability to describe cattle behaviors of lying, standing, and walking. Classification accuracies for the 3s, 5s, and 10s reporting interval were 98.1%, 97.7%, and 85.4% respectively, with no difference in classification accuracy of the 3s and 5s epochs (P=0.73) while the 10s epoch exhibited significantly lower overall accuracy (P<0.01). This validated accelerometer monitoring system was then implemented in two studies (Winter 2007 and Spring 2008) where the devices were used to describe behavior patterns of beef calves in a drylot production setting. Lying behavior of the cattle was analyzed and found to be significantly associated (P<0.001) with hour of the day. Calves in these studies spent most (> 55%) of the nighttime hours (2000 to 0400) involved in lying behavior and spent the least percentage of time lying (<30%) during periods of time where feed was presented at the bunk (0700 and 1700). Mean lying time was also associated with trial day (P<0.01) and most trial days (67.5%) calves spending between 45% and 55% of time lying. Variation of lying behavior was found between individuals (range 29% to 66%); however, consistency in lying behavior was found within individual calves across study periods. The accelerometer monitoring system studies presented here provide evidence these devices have utility in recording behaviors (lying, standing, and walking) of individual beef calves raised in typical production settings.
6
Singh, Rohitpal. "An Approach for Deliberate Non-Compliance Detection during Opioid Abuse Surveillance by a Wearable Biosensor". Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/1260.
Testo completoAbstract (sommario):
Wearable sensors can be used to monitor opioid use and other key behaviors of interest, and to prompt interventions that promote behavioral change. The effectiveness of such systems is threatened by the potential of a subject's deliberate non-compliance (DNC) to the monitoring. We define deliberate non-compliance as the process of giving one's device to someone else when surveillance is on-going. The principal aim of this thesis is to develop an approach to leverage movement and cardiac features from a wearable sensor to detect such deliberate non-compliance by individuals under surveillance for opioid use. Data from 11 participants who presented to the Emergency Department following an opioid overdose was analyzed. Using a personalized machine learning classifier (model), we evaluated if a snippet of blood volume pulse (BVP) and accelerometer data received is coming from the expected participant or an alternate person. Analysis of our classier shows the viability of this approach, as we were able to detect DNC (or compliance) with over 90% accuracy within 3 seconds of its occurrence.
7
Zhuang, Yuwen. "Metric Based Automatic Event Segmentation and Network Properties Of Experience Graphs". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337372416.
Testo completo
8
Silva, Anderson Braulio Nobrega da. "Um modelo de unidade de medida inercial utilizando tr?s aceler?metros triaxiais". Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15500.
Testo completoAbstract (sommario):
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Previous issue date: 2013-10-07No espa?o tridimensional, um corpo r?gido qualquer pode efetuar transla??es e ou rota??es em rela??o a cada um de seus eixos. Identificar com precis?o o deslocamento realizado por um corpo ? fundamental para alguns tipos de sistemas em engenharia. Em sistemas de navega??o inercial tradicionais, utilizam-se aceler?metros para reconhecer a acelera??o linear e girosc?pios para reconhecer a velocidade angular registrada durante o deslocamento. O girosc?pio, entretanto, ? um dispositivo de custo mais elevado e com alto consumo de energia quando comparado a um aceler?metro. Essa desvantagem deu origem a pesquisas a respeito de sistemas e unidades de medidas inerciais que n?o utilizam girosc?pios. A ideia de utilizar apenas aceler?metros para calcular o movimento linear e angular surgiu no in?cio da d?cada de 60 e vem se desenvolvendo atrav?s de modelos que variam no n?mero de sensores, na maneira como estes s?o organizados e no modelo matem?tico que ? utilizado para derivar o movimento do corpo. Esse trabalho prop?e um esquema de configura??o para constru??o de uma unidade de medida inercial que utiliza tr?s aceler?metros triaxiais. Para identificar o deslocamento de um corpo r?gido a partir deste esquema, foi utilizado um modelo matem?tico que utiliza apenas os nove sinais de acelera??o extra?dos dos tr?s sensores. A proposta sugere que os sensores sejam montados e distribu?dos em formato de L . Essa disposi??o permite a utiliza??o de um ?nico plano do sistema de coordenadas, facilitando assim a instala??o e configura??o destes dispositivos e possibilitando a implanta??o dos sensores em uma ?nica placa de circuito integrado. Os resultados encontrados a partir das simula??es iniciais demonstram a viabilidade da utiliza??o do esquema de configura??o proposto
9
Yu-JhenHo e 何域禎. "Walking pattern classification and distance estimation using a triaxial accelerometer". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/21110955701208725261.
Testo completo
10
Wang, Wei-Kai, e 王煒剴. "Design and Evaluation of Tilt-meter Based on Digital Triaxial Accelerometer". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/80812499264348292936.
Testo completoAbstract (sommario):
碩士國立臺灣科技大學
營建工程系
102
During construction phase of engineering projects, monitoring system must be set up to monitor surroundings and adjacent structures. This system ensures their serviceability and safety are not affected by engineering activities. Automated monitoring systems that are correctly set up is proven to be effective to achieve the above mentioned goal. They can be used to setup alarm before accident occurs, and they can provide information for remedial measures after accident occurs. In this research, a prototype tilt-meter based on high-resolution digital triaxial accelerometer is developed. The device integrates a micro controller unit (MCU). The MCU reads digital output from accelerometer and converts it into tilt angle. The design selects carefully accelerometer, MCU, power management ICs to achieve low power consumption. In addition to the developed prototype device, this research also considers how to calibrate internal parameters in order to correctly measure tilt. How temperature affects readings from accelerometers is also discussed. A procedure to compensate thermal drift observed is proposed. This compensation is necessary to avoid false alarm from the built tilt-meter. The developed tilt-meter can effectively reduce labor cost and construct automated monitoring system cost effectively. It enables constructors know about how the surrounding reacts to the engineering activities, thus increases site safety, and avoid possible human life loss caused by construction site incidents.
11
Chen, Chung-Yi, e 陳重亦. "The Design and Implementation of Fall Detection based on Triaxial Accelerometer". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/45338136071576233345.
Testo completoAbstract (sommario):
碩士國立中正大學
電機工程研究所
101
Since 1993, Taiwan has entered population-aging society. Elderly population aged over 65 has increased steadily proportion. Due to the population structure alteration, the elderly problems and life needs will change. With the elderly physical degradation, accidental deaths caused by falls has become an unavoidable issue. About falls prevention and rescue research in recent years has become a topic of attention. In this thesis, we proposed an acceleration fall detection system which has fall detection, pedometer and unsteady gait detection. In this thesis, we implement fall detection on an embedded system and use accelerometer to implement pedometer and unsteady gait detection. It can immediately detect and send an alert when user falls. Pedometer can be used to self-monitoring and effectively increase the amount of exercise every day by the way of progressive goal setting. Therefore, it can reduce the probability of falls due to the leg strength enhancement. It also can send an alert in advance when detecting user's unsteady gait. The system characteristic are rapid fall detection and unsteady gait detection. The sensitivity of fall detection can achieve 95% and the sensitivity of unsteady gait detection can achieve 99%.
12
Peng, Jiug-Jun, e 彭敬鈞. "A Research on Structural Health Monitoring for Bridge Using Triaxial Accelerometer". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/47df9v.
Testo completoAbstract (sommario):
碩士國立臺灣科技大學
營建工程系
105
In this thesis, we aim to focus on the latest technologies and developments in the field of Structural health monitoring (SHM). This study explores the accelerometers for measuring structural vibration, from which structural health and post-event damage can be diagnosed. The concentration for low cost sensing, power saving (only use AAA battery), easy installation, local saving data, calculation (FFT) on chip are focused in this study. The constructed device comprises a System on Chip (SoC) platform, accelerometers, power converter, and SD card, LoRa module, etc. To reduce the power consumption, we used a STM32F103C8T6 SoC, in the Standby mode that only consumes 2 uA, and 40 mA in running mode. For data collection, we used SD card to record the raw data and the calculated results. Besides, we expand the usage by providing wireless transmission using LoRa module. The entire cost of the device is around NT2000. The accuracy of the proposed device has been verified with a commercial electrodynamic vibration generator. Also, we simulated multiple signals to evaluate the sensitivity of the device. However, the results remain the limitation of deployment in all kinds of bridge monitoring. The ongoing SHM applications for bridge monitoring are still needed the sensor technology improvement to finally achieve the desired objective.
13
Jyun-LinGuo e 郭俊麟. "Combining Waveform and Wavelet Analysis on a Triaxial Accelerometer for Activity Classification". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/66460398030901610754.
Testo completo
14
Ting-Lin, Chu, e 朱廷霖. "Combined with Triaxial Accelerometer and Bluetooth Module to Implement Electrical Wheelchair Design". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/07847580494692766945.
Testo completoAbstract (sommario):
碩士中華科技大學
電子工程研究所碩士班
102
The article establishes a digitalized electrical wheelchair, which includes three operation modes of tri-axis accelerometer remote control, supersonic auto-tracking and electronic compass auto-positioning, with 320x240 graphic mode LCD monitor as user interface, showing the present wheelchair status and vicinity environmental information. The tri-axis accelerometer adopts MEMS (micro electro mechanical system) processing, and its application includes motion detection, tilt detection and collision detection. With each measured axial acceleration component, through vector addition of three acceleration components, acceleration value of motion direction can be obtained. In remote control mode, with acceleration value of motion direction from tri-axis accelerometer, tilt detection conducted. Operating frequency range of Bluetooth wireless module is 2.45GHz, transmission range from 10cm to 100m, using frequency-hopping spread spectrum technique, and supports synchronous and asynchronous transmission mode, prone to be integrated with TCP/IP to a wireless communication network architecture. The main spirit of the digitalized electrical wheelchair rested on using embedded microcontroller ATMega162 to design two set of digital-to-analogue converter (DAC) circuit to replace the analog voltage transmitted from joystick controller, and with simulated X, Y direction voltage size to control motion direction and speed of the wheelchair. In recent years, studies of many academic groups, gradually deliberate about how to combine technology and needs of the disabled, thus various auxiliary appliances for the disabled (including mentally retarded, visual impaired, physically disabled) become focus of academic studies. Hope that with such academic power the group of “angels with broken wings” could obtain proper assistance, thus better living environment created. Without electrical wheelchair, the weight of wheelchair itself plus patient could make affiliated caretaker use up whole body strength to keep the wheelchair moving. The system constructed in the article aims at controlling manual joystick of electrical wheelchair for the physically disabled like patients of muscular dystrophy or the one unable to move by self-consciousness (such as mentally retarded). Thus an tri-axis accelerometer is designed into wristwatch form, whereby, the caretaker only needs to move wrist, with blue-tooth transmission, the digitalized electrical wheelchair can be operated, thereby the patient and affiliated people can be further helped, to enjoy sunlight, stroll in green forest etc. easily.
15
Peng, Shin-hua, e 彭信華. "The design and verification of a tilt-measuring device based on triaxial accelerometer". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/46601805259275829715.
Testo completoAbstract (sommario):
碩士國立臺灣科技大學
營建工程系
98
Building tilt is one of the key indicators in a field monitoring program when underground constructions are involved. By measuring building tilt, impact of construction activities on surrounding structures can be identified, and precautions can be taken before disaster strikes. In this research, a tilt-measuring device is developed based on triaxial accelerometers. By integrating accelerometer, high-resolution analog-digital converter, and embedded controllers, tilt can be measured. In this thesis, the process of developing the tilt-measuring device through selecting, testing and integrating triaxial accelerometer, analog-digital converter and voltage-conversion components is thoroughly documented. In additional to developing the prototype tilt-measuring device, an automated procedure on calibrating parameters of the developed device is proposed. By using the procedure, required parameters of the device can be obtained, and the calibrated device can output accurate tilt measurement. The procedure can also be applied to other devices based on triaxial accelerometers. Finally, an automate validation procedure is developed to confirm whether two tilt-measuring devices have consistent tilt measurements. This procedure validates two tilt-measuring devices by varying inclinations of two devices installed on the same plane, and a calculation procedure is applied to eliminate errors associated with device installations. Through this procedure, it is confirmed the prototype device is as accurate as a commercial tilt-measuring device. Furthermore, the prototype device has advantages on construction cost, power consumption and long-term monitoring cost. The prototype is suitable to combine with wireless sensor network technology to measure building tilts.
16
Chen, Yuh-Jiun, e 陳毓君. "The Energy Expenditure during Continuous and Intermittent Walking— RT3 Triaxial Accelerometer and Indirect Calorimetry". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/31265152469298623083.
Testo completoAbstract (sommario):
碩士國立體育學院
運動傷害防護研究所
92
Purposes: The purposes of this study were (1) to investigate the validity of a triaxial accelerometer for measuring energy expenditure during treadmill walking. (2) to compare the oxygen consumption during continuous and intermittent treadmill walking. Method: Twenty young and apparently healthy subjects with mean age of 23.6 ± 2.3 years were recruited to participate in this study. The triaxial accelerometer (RT3, Stayhealthy, Inc.) and indirect calorimetry (SensorMedics, Vmas 29) were used simultaneously to measure the energy expenditure during exercise. All subjects participated in three treadmill tests: (1) using Bruce protocol to test heart rate predicted maximal oxygen consumptions. (2) randomly walked on treadmill under 9 conditions (speed 2, 3, 4 mph combined with slope 0%, 3.5% and 7 %). Each exercise lasted for 5 minutes and there were at least 5 minutes rest time in between. (3) randomly participated in continuous treadmill walking (4 mph, 30 minutes exercise followed by 30 minutes rest) and intermittent treadmill walking (4 mph, 10 minutes exercise followed by 10 minutes rest and repeated 3 times). SPSS/PC 10.0 were used for statistic analysis. Results: RT3 energy consumption vs. indirect calorimetry and RT3 vector magnitude vs. indirect calorimetry are both highly correlated (r = .8, p < .01, r = .65, p < .01). Under 0 %、3.5 %、7 % three different slopes, correlations between RT3 energy consumption and vector magnitude vs. indirect calorimetry are r = .94, .78, r = .95, .77, and r = .94, .76 (p all < .01). While under 2, 3, 4 mph three different speed, correlations between RT3 energy consumption and vector magnitude vs. indirect calorimetry are r = .26 (p < .05), - .42 (p < .01), r = .39 (p < .01), - .27(p < .05), and r = .41 (p < .01), - .27(p < .05). As for continuous and intermittent exercise measures, RT3 energy consumption vs. indirect calorimetry is significant correlated during total energy expenditure (r = .80), with a higher correlation during exercise (r = .73) than rest (r = .59). The results of energy expenditure between continuous and intermittent exercise suggest that there is no significant difference in total oxygen consumption (t = - .68, p> .05) and in exercise (t = .63, p > .05). Although there is significant difference in post exercise oxygen consumption between continuous and intermittent exercise (t = - 5.06, p < .05). Conclusions: RT3 is valid in evaluating energy consumption during treadmill walking, although it is more sensitive to change of speed rather than change of slope. Intermittent exercise could generate more post-exercise oxygen consumption and is a favorable choice for many populations. Further researches are needed to investigate differences between continuous and intermittent exercise under different modes of exercises and in different populations.
17
Huang, Su-Wei, e 黃思瑋. "Application of Triaxial Accelerometer for Vibration Signal Measurement and Fault Diagnosis of Rotating Machinery". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/55193409601638448893.
Testo completoAbstract (sommario):
碩士正修科技大學
電機工程研究所
99
For normal operation of the rotating machinery, preventing and detecting the incipient faults of the machinery is an important task, especially in the production lines of the high-technology industry. If the incipient fault cannot be detected in its early stage, then it will lead to the serious faults. The close coupling of the machinery leads to the cause of its vibration faults more diverse and complicated; however, the vibration status is still a vital indicator for identifying whether the machinery operates normally or not. Therefore, rotating machines’ vibration monitoring and fault diagnosis method is not only significant in productivity and economic benefits of high-technology industry, but also an important research topic in the field of electrical engineering. Vibration faults of rotating machinery are with diverse characteristics. Although the traditional error back-propagation neural network can be used to diagnose the vibration faults, it is with a long training time and its parameters are difficult to be determined. Therefore, to solve the vibration signal measurement and fault diagnosis of rotating machinery, this study first used the triaxial accelerometer to measure vibration signals, then the Particle Swarm Optimization (PSO) tuned General Regression Neural Network (GRNN) model diagnosed the vibration faults. This study has proposed PSO to adjust the smoothing parameter of the GRNN, and model performances of the optimal diagnosis model obtained were compared with those of the traditional neural networks. Test results have shown that the proposed methods are with less model constructing time and higher diagnosis accuracy than those of the traditional methods. Therefore, this study has confirmed the feasibility of the proposed approach to practical system applications.
18
Wang, Pei-Fan, e 王佩凡. "Energy Expenditure during Forehand Table-Tennis Trial—Comparison between RT3 Triaxial Accelerometer and Indirect Calorimetry". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/33777473663608408396.
Testo completoAbstract (sommario):
碩士國立體育大學
運動科學研究所
97
Purpose: The purposes of this study were to investigate the correlation between RT3 triaxial accelerometer and indirect calorimetry measurements; to compare data from three different stroke frequencies and from RT3 worn at different anatomic locations. Method: Twenty young healthy male table-tennis athletes (20.25 ± 1.65 years) with no known history of upper limbs injuries in the previous 6 months volunteered to participate in this study. The triaxial accelerometer (RT3, Stayhealthy, Inc.) and indirect calorimetry (SensorMedics, Vmax 29) were used simultaneously to measure the energy expenditure and oxygen consumption during exercise. Four accelerometers were attached at lower back (L3), dominant side of shoulder, elbow, and wrist. Each subject randomly adopted tree forehand table-tennis trials at frequency of 60 balls/min, 75 balls/min, 90 balls/min for 5 minutes. Pearson correlation coefficient was used to examine the correlation between the RT3 and indirect calorimetry measurements. One-way ANOVA was used to test any significant difference among three stoke frequencies and four RT3 locations. Result: Correlations between RT3 energy consumption and indirect calorimetry, RT3 vector magnitude and indirect calorimetry(for RT3 at elbow and wrist) are moderate to high (r = 0.39~0.75, p < .01). All parameters were lower for 60 balls/min than 75balls/min and 90 balls/min in all test conditions. For all test conditions, the vector magnitude and energy expenditure measured by RT3 were lowest at the low back than elbow, shoulder and wrist (low back < elbow < shoulder < wrist). No statistically significant difference were found between RT3 at shoulder and elbow.Conclusion: We concluded that RT3 was suitable in distinguishing different forehand table-tennis stroke frequency across all wearing locations and had moderate to high correlation with indirect calorimetry.
19
Chang, Fu-Sung, e 張釜菘. "The application of using the SVM classifier in medical care- use the smartphone with triaxial accelerometer for the posture recognitionFu-Sung ChangInstitute of Information ManagementThe application of using the SVM classifier in medical care- use the smartphone with triaxial accelerometer for the posture recognitionFu-Sung ChangInstitute of Information ManagementThe application of using the SVM classifier in medical care- use the smartphone with triaxial accelerometer for the posture recognitionFu-Sung ChangInstitute of Information ManagementThe application of using the SVM classifier in medical care- use the smartphone with triaxial accelerometer for the posture recognition". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/02122812595966846129.
Testo completoAbstract (sommario):
碩士國立高雄應用科技大學
資訊管理系
100
disease. The purpose of this research is aimed to use single 3 axis accelerometer which embedded in smart phone to develop an activity recognition system. It can detected and take down the 8 types of human daily activity and their duration. Besides, the user will be rewarded the record as a diet basis. It can be a self-exercise manager platform, moreover, can be used by medical organization. Through this system, doctor can provide user appropriate exercise suggestion which will help user to form exercise habit, and lower the morbidity of chronic disease. Finally, this research evaluated the performance of the classifier in practical experiment. Our result have successfully validated: 1) the effectiveness of feature selection 2) recognition capability of the classifier and achieve satisfactory performance for human activity recognition.
20
(9809204), Harpreet Kour. "Exploring the maternal behaviour of north Australian beef cattle using precision livestock management technologies". Thesis, 2019. https://figshare.com/articles/thesis/Exploring_the_maternal_behaviour_of_north_Australian_beef_cattle_using_precision_livestock_management_technologies/13455065.
Testo completoAbstract (sommario):
This research explored the use of triaxial accelerometer fitted on right side of halter of calf to record its suckling behaviour under pastoral condition of north Australia beef farms. It also investigated various calf’s and cow’s factors effecting suckling behaviour of calf. The relationship between time spent by calf in suckling its dam and time spent by calf in close proximity to its dam was explored.
21
Chen, Yi-Chun, e 陳宜君. "The dynamic balance assessments using triaxial accelerometers in the elderly". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/52251642395850835740.
Testo completoAbstract (sommario):
碩士國立體育大學
運動保健科學研究所
98
Purpose: The feasibility of triaxial accelerometers (TAs) for the dynamic balance assessment in the elderly is still unknown. The purposes of this study were to investigate the correlation between TAs and the performance of clinical dynamic balance tests, and to compare the difference of three axes and three different positions of TAs. Method: Sixteen elderly, aged 65 and over, were recruited(mean age: 75.31 ± 6.17 yrs) to participate in this study. The TAs were placed at the following anatomic positions, the 7th cervical vertebra (C7), the 3rd lumbar vertebra (L3) and fibular head of dominant leg. Then, subjects were asked to perform the functional reach test (FRT) and the five-times sit to stand test (FTSST) twice. The longer distance from the FRT and the shorter time from FTSST were used for analysis. The data of the TAs was collected from Biopac MP150 system with sampling rate at 200Hz. Root mean square (RMS) was calculated from TA data. Pearson correlation coefficient was used to examine the relationship between TAs and the performance of the clinical dynamic balance tests. One-way ANOVA repeated measures was performed to investigate the difference among three axes and three positions. Result: The RMS in the forward phase of FRT, including anterior-posterior (A/P) axis of C7, A/P axis of L3, left-right (L/R) axis of L3 and L/R axis of FH, were significantly correlated with the performance of FRT(r= .51~ .70; p< .05). In the backward phase of FRT, the RMS of A/P axis of L3, L/R axis of FH and vertical (V) axis of FH, were significantly correlated with the performance of FRT (r= .51~ .76; p< .05).In FTSST, the RMS of V axis of L3, A/P axis of FH and V axis of FH, were inversely correlated with the performance of FTSST (r=- .58~- .84; p< .05). The RMS of different axes measured with TAs at the position of C7 and L3 were A/P > V > L/R, yet at FH position was A/P > L/R > V. The RMS of A/P axis in FRT was L3>C7>FH. The RMS of V axis in FTSST was C7> L3>FH. Conclusion: The correlation was moderate to high between the performance of the clinical dynamic balance tests and TAs in the elderly. The RMS of L/R axle may be a sensitive indicator of body sway. The better position for TA attachment is at L3 for the two clinical dynamic balance tests.
22
Hsieh, Yu-Fang, e 謝瑜芳. "Assessment of Physical Activity Level in Stroke Patients useing Triaxial Accelerometers". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/93927891555858697019.
Testo completoAbstract (sommario):
碩士國立體育大學
運動與健康科學學院
103
Background & Purpose: Stroke not only causes physical function impairment but also physical inactivity. Although maintaining higher physical activity level is important in preventing another stroke. In this research, the Triaxial Accelerometers (TA) we used to record the physical activity level at home for stroke patients. In order to use the TA records as a healthy index to remind the chronic stroke patients in participating in physical activity, relationship among functional ability and performance, abnormal muscle tone and history of fall in six months,and physical activities level were investigated. Method: In the rehabilitation outpatient clinic, the Fugl-Meyer Assessment (FMA), Five Times Sit to Stand (FTSTS) test, and Modified Ashworth Scale (MAS) were administered to 20 stroke patients from the Rehabilitation Department of Taipei Hospital, Ministry of Health and Welfare. The history of fall in the previous six months were also recorded. After that, the patients were asked to wear the TA for 3 days and data was downloaded for analysis. Descriptive analysis was used for the demography and basic physical activity level of patients. The Independent- t test was used to compare the difference of physical activity level among patients with different MAS and times of fall Pearson product-moment correlation was used to identify the correlation between physical activity level and FMA, also and the physical activity level and FTSTS. Results: (1). The correlation coefficient between TA record and FMA is 0.468 of TA record and FMA (p＜0.05). (2).The mean TA record of subjects with low MAS (m=28.31 kcal/kg/day) is higher than The mean TA record of subjects with high MAS (m=25.66 kcal/kg/day), but not significant difference ( p>0.05). (3) The correlation coefficient between TA record and FTSTS is -0.5 (p＜0.05). (4) The mean TA record of subjects without the history of fall (m=29.06 kcal/kg/day) is higher than subjects with the history of fall (m=25.83 kcal/kg/day)(p＜0.05). Conclusion: Stroke patients with better functional ability, the FMA score physical activity level are both higher. If the stroke patients are poor in physical balance, they usually need more time to change the position from sit to stand and will affect level of physical activity . Subjects with history of fall in previous 6 months, the level of physical activity are usually lower. With all these results, we suggest that TA record is a good healthy index that can be used to communicate with the patients and persuade the patients to follow the medical orders. Keywords: Physical activities, Stroke, Triaxial accelerometers
23
李燕茹. "The Correlation between Triaxial Accelerometor and Force Platform Measurements of Static Balance". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/11451955324663445615.
Testo completoAbstract (sommario):
碩士國立體育大學
運動傷害防護研究所
95
Purpose: The purposes of this study were to investigate the correlation between RT3 triaxial accelermetor and force platform measurements and to compare data of three different static balance tests with RT3 worn at different anatomic positions. Method: Twenty young healthy subjects (aged: 22.50±2.37 years old) with no known history of balance disorders or musculoskeletal injuries in the previous 6 months voluntaried participating in this study. Four accelerometers were attached to lower back and dominant side of hip, knee and ankle for each subject while standing simultaneously on the force platform. Each subject randomly adopted three static balance tests (tandem test with eye open, one leg standing with eye open and closed) for 20 seconds. Tri-axial vector magnitude (activity count) was recorded from RT3. Output from the force platform included mean speed, mean radius, and mean area. Pearson correlation coefficient was used to examine the correlation between the RT3 and force platform measurements. One-way ANOVA was used to test any significant difference among three trials and four positions. Result: Analysis of RT3 at lower trunk, hip and knee and sway velocity measured with force platform for all the conditions revealed significant correlation (r= .50~.85, p<.05). The correlation was moderate to high(r= .49~74, p<.05) between RT3 at three positions (lower trunk, hip and knee) and radius/area measured with force platform for OLSO and OLSC. RT3 at ankle was only significantly correlated with parameters measured with force platform during OLSC. All parameters were lower during TO than OLSO and OLSC in all test conditions. Statistically significant differences were found between TO and OLSC, OLSO and OLSC. There was no significant difference between TO and OLSO. For all test conditions, the ranks of vector magnitude measured with RT3 was lower trunk
24
Pin-Feng, Kao, e 高斌峰. "Integration of ZigBee modules and triaxial accelerometers to improve indoor positioning performance". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/53219218792211633391.
Testo completoAbstract (sommario):
碩士中華大學
機械工程學系碩士班
100
This research uses the ZigBee wireless sensor network (WSN) to monitor noble object movement. The ZigBee nodes use OctopusX-C modules. This device has CC2430 microcontroller, directional and omni-directional antennas, flash memory, USB interface, and I/O terminals to facilitate the transmission of USB interface. Only two AA-type batteries are needed to maintain low energy operation. This research uses Kalman filter to integrate OctopusX-C, and triaxial accelerometer sensors for object movement monitoring. Visual Basic 6.0 is applied for system programming and interface control. The acceleration data sensed by OctopusX-C and it value of the Received Signal Strength Indicator (RSSI) are sent to the PC. The Kalmam filter based on Visual Basic 6.0 is applied for remote monitoring and control. This can reduce the manpower and effectively accomplish the monitoring work. Kalman filter is coded by using MATLAB software package, and applied to integrate the triaxial accelerometers sensed by OctopusX-C and the value of the Received Signal Strength Indicator (RSSI), thus the errors of INS can be corrected, and the positioning accuracy can be increased for remotely monitoring object movement.
25
Pin, Tsai Wen, e 蔡文彬. "Applying Six-Sigma to Die Bond Process Improvement for Piezoresistive Triaxial Accelerometers". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/87341825206249955758.
Testo completoAbstract (sommario):
碩士明志科技大學
工業工程與管理系碩士班
102
Integrated circuit (IC) design industry is thriving in Taiwan. Under specialization and division of work, downstream IC assembly factories still have high growth potential. Because IC assembly industry varies from minute to minute, to promote product quality and industry competitiveness, IC assembly factories all try to take actions on the control of assembly process yield in order to build latest IC assembly process and create high value-added products to increase customer satisfaction. One of the important things is that the stress caused by die bond step of IC assembly process may lead to chip/die deformation and, futher, make the sensitivity and offset of triaxial (3-aix) accelerometer fail. Therefore, this research applies the DMAIC analysis method of Six-Sigma (6σ) to solve the stress issue of triaxial (3-aix) accelerometer caused by die bond step of IC assembly process. The D (Define) stage first collects the opinions from end-customers and analyzes the returned product issues. Next, the M (Measure) stage measures the process capability via the repeatability and reproducibility analysis of equipment for the basis of the following process improvement. The A (Analyze) stage uses the cause & effect matrix to identify the possible impact factors of stress. The I (Improve) stage applies the design of experiment (DOE) method to identify the optimal design of impact factors and ensure the improvement effect. Finally, the C (Control) stage uses the control chart to monitor the following experimental results. Furthermore, this research applies the research approach to IC assembly process of micro electro-mechanical system (MEMS). The result shows that the yield rate of the process increases about 1.15%.
26
Liu, Che-Yu, e 劉哲瑀. "The correlation analysis of gait features and weight change based on wearable triaxial accelerometers". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/qgahn5.
Testo completoAbstract (sommario):
碩士國立雲林科技大學
資訊工程系
106
Due to the development of modern science and Health concept of the rise, Whether it is because of fear of overweight brought about by physical illness or fitness must be the weight control. Weight has become a body signal that people very concerned. The purpose of this study is to use the triaxial acceleration to collect ankle signals to observe what changes in gait characteristics when weight changes .Through these changes to achieve a weight change identification system based on gait signal. We have twenty subjects, ten men and ten women, aged between 21 to 50 years old. We asked our subjects wear wearable triaxial acceleration sensor on the ankle and walk back in a 20-meter tiles corridor. Subjects are required to walk according to the frequency of the metronome, repeat the experiment several times to simulate the real weight changes. The exact definition of the gait cycle was first proposed by Margareta Nordin et in 1989. They divide a gait into seven events, which have been cited more than three thousand times in modern research. We use this mark the start and end of each step, and cut out the complete signal, then design a variety of classifiers to compare which classifier is more suitable for analysis of the correlation of weight change and gait features. By the comparison of the features, we finally get SVM classifier for the correlation of weight change and gait features has a high recognition rate and faster computing performance. In general, we implemented a weight change identification system based on gait signals, and this system is accurate and reliable. In the future, we hope that the technology used in the fitness industry and the elderly medical care. So that life can be more intelligent and comfortable