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https://www.readbyqxmd.com/read/27918696/validation-of-inertial-measurement-units-for-upper-body-kinematics
#1
Melissa M B Morrow, Bethany Lowndes, Emma Fortune, Kenton R Kaufman, Susan Hallbeck
The purpose of this study was to validate a commercially available IMU system against a standard lab-based motion capture system for the measurement of shoulder elevation, elbow flexion, trunk flexion/extension and neck flexion/extension kinematics. The validation analyses were applied to six surgical faculty members performing a standard, simulated surgical training task that mimics minimally invasive surgery. Three-dimensional joint kinematics were simultaneously recorded by an optical motion capture system and an IMU system with six sensors placed on the head, chest, and bilateral upper and lower arms...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27916852/mems-imu-error-mitigation-using-rotation-modulation-technique
#2
Shuang Du, Wei Sun, Yang Gao
Micro-electro-mechanical-systems (MEMS) inertial measurement unit (IMU) outputs are corrupted by significant sensor errors. The navigation errors of a MEMS-based inertial navigation system will therefore accumulate very quickly over time. This requires aiding from other sensors such as Global Navigation Satellite Systems (GNSS). However, it will still remain a significant challenge in the presence of GNSS outages, which are typically in urban canopies. This paper proposed a rotary inertial navigation system (INS) to mitigate navigation errors caused by MEMS inertial sensor errors when external aiding information is not available...
November 29, 2016: Sensors
https://www.readbyqxmd.com/read/27916817/real-time-classification-of-patients-with-balance-disorders-vs-normal-subjects-using-a-low-cost-small-wireless-wearable-gait-sensor
#3
Bhargava Teja Nukala, Taro Nakano, Amanda Rodriguez, Jerry Tsay, Jerry Lopez, Tam Q Nguyen, Steven Zupancic, Donald Y C Lie
Gait analysis using wearable wireless sensors can be an economical, convenient and effective way to provide diagnostic and clinical information for various health-related issues. In this work, our custom designed low-cost wireless gait analysis sensor that contains a basic inertial measurement unit (IMU) was used to collect the gait data for four patients diagnosed with balance disorders and additionally three normal subjects, each performing the Dynamic Gait Index (DGI) tests while wearing the custom wireless gait analysis sensor (WGAS)...
November 29, 2016: Biosensors
https://www.readbyqxmd.com/read/27862238/validation-of-distal-limb-mounted-inertial-measurement-unit-sensors-for-stride-detection-in-warmblood-horses-at-walk-and-trot
#4
F M Bragança, S Bosch, J P Voskamp, M Marin-Perianu, B J Van der Zwaag, J C M Vernooij, P R van Weeren, W Back
BACKGROUND: Inertial-measurement-unit (IMU)-sensor-based techniques are becoming more popular in horses as a tool for objective locomotor assessment. OBJECTIVES: To describe, evaluate and validate a method of stride detection and quantification at walk and trot using distal limb mounted IMU-sensors. STUDY DESIGN: Prospective validation study comparing IMU-sensors and motion capture with force plate data. METHODS: Seven Warmblood horses equipped with metacarpal/metatarsal IMU-sensors and reflective markers for motion capture were hand walked and trotted over a force plate...
November 12, 2016: Equine Veterinary Journal
https://www.readbyqxmd.com/read/27834871/determination-method-of-bridge-rotation-angle-response-using-mems-imu
#5
Hidehiko Sekiya, Takeshi Kinomoto, Chitoshi Miki
To implement steel bridge maintenance, especially that related to fatigue damage, it is important to monitor bridge deformations under traffic conditions. Bridges deform and rotate differently under traffic load conditions because their structures differ in terms of length and flexibility. Such monitoring enables the identification of the cause of stress concentrations that cause fatigue damage and the proposal of appropriate countermeasures. However, although bridge deformation monitoring requires observations of bridge angle response as well as the bridge displacement response, measuring the rotation angle response of a bridge subject to traffic loads is difficult...
November 9, 2016: Sensors
https://www.readbyqxmd.com/read/27831937/minimalistic-optic-flow-sensors-applied-to-indoor-and-outdoor-visual-guidance-and-odometry-on-a-car-like-robot
#6
Stefano Mafrica, Alain Servel, Franck Ruffier
Here we present a novel bio-inspired optic flow (OF) sensor and its application to visual  guidance and odometry on a low-cost car-like robot called BioCarBot. The minimalistic OF sensor was robust to high-dynamic-range lighting conditions and to various visual patterns encountered thanks to its M(2)APIX auto-adaptive pixels and the new cross-correlation OF algorithm implemented. The low-cost car-like robot estimated its velocity and steering angle, and therefore its position and orientation, via an extended Kalman filter (EKF) using only two downward-facing OF sensors and the Ackerman steering model...
November 10, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27827880/wearable-imu-for-shoulder-injury-prevention-in-overhead-sports
#7
Samir A Rawashdeh, Derek A Rafeldt, Timothy L Uhl
Body-worn inertial sensors have enabled motion capture outside of the laboratory setting. In this work, an inertial measurement unit was attached to the upper arm to track and discriminate between shoulder motion gestures in order to help prevent shoulder over-use injuries in athletics through real-time preventative feedback. We present a detection and classification approach that can be used to count the number of times certain motion gestures occur. The application presented involves tracking baseball throws and volleyball serves, which are common overhead movements that can lead to shoulder and elbow overuse injuries...
November 3, 2016: Sensors
https://www.readbyqxmd.com/read/27810211/body-lean-angle-in-sound-dressage-horses-in-hand-on-the-lunge-and-ridden
#8
Line Greve, Sue Dyson
Animals can minimise the risk of falling by leaning into a curve. The aims of this study were: (1) to quantify the difference between observed (measured by an inertial measurement unit, IMU) and predicted body lean angle (calculated as a cyclist when turning) in horses; and (2) to compare circles versus straight lines ridden versus in-hand and trot with canter, and investigate the influence of age, rein and ridden work quality in trot (Fédération Equestre Internationale grading scale 1-10) in horses. Thirteen non-lame horses were assessed prospectively in a non-random, cross-sectional survey...
November 2016: Veterinary Journal
https://www.readbyqxmd.com/read/27802152/preferred-gait-and-walk-run-transition-speeds-in-ostriches-measured-using-gps-imu-sensors
#9
Monica A Daley, Anthony J Channon, Grant S Nolan, Jade Hall
The ostrich (Struthio camelus) is widely appreciated as a fast and agile bipedal athlete, and is a useful comparative bipedal model for human locomotion. Here, we used GPS-IMU sensors to measure naturally selected gait dynamics of ostriches roaming freely over a wide range of speeds in an open field and developed a quantitative method for distinguishing walking and running using accelerometry. We compared freely selected gait-speed distributions with previous laboratory measures of gait dynamics and energetics...
October 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27782290/technology-in-rehabilitation-evaluating-the-single-leg-squat-exercise-with-wearable-inertial-measurement-units
#10
Darragh F Whelan, Martin A O'Reilly, Tomás E Ward, Eamonn Delahunt, Brian Caulfield
BACKGROUND: The single leg squat (SLS) is a common lower limb rehabilitation exercise. It is also frequently used as an evaluative exercise to screen for an increased risk of lower limb injury. To date athlete / patient SLS technique has been assessed using expensive laboratory equipment or subjective clinical judgement; both of which are not without shortcomings. Inertial measurement units (IMUs) may offer a low cost solution for the objective evaluation of athlete / patient SLS technique...
October 26, 2016: Methods of Information in Medicine
https://www.readbyqxmd.com/read/27776168/an-automated-recording-method-in-clinical-consultation-to-rate-the-limp-in-lower-limb-osteoarthritis
#11
R Barrois, Th Gregory, L Oudre, Th Moreau, Ch Truong, A Aram Pulini, A Vienne, Ch Labourdette, N Vayatis, S Buffat, A Yelnik, C de Waele, S Laporte, P P Vidal, D Ricard
For diagnosis and follow up, it is important to be able to quantify limp in an objective, and precise way adapted to daily clinical consultation. The purpose of this exploratory study was to determine if an inertial sensor-based method could provide simple features that correlate with the severity of lower limb osteoarthritis evaluated by the WOMAC index without the use of step detection in the signal processing. Forty-eight patients with lower limb osteoarthritis formed two severity groups separated by the median of the WOMAC index (G1, G2)...
2016: PloS One
https://www.readbyqxmd.com/read/27764231/regression-model-based-walking-speed-estimation-using-wrist-worn-inertial-sensor
#12
Shaghayegh Zihajehzadeh, Edward J Park
Walking speed is widely used to study human health status. Wearable inertial measurement units (IMU) are promising tools for the ambulatory measurement of walking speed. Among wearable inertial sensors, the ones worn on the wrist, such as a watch or band, have relatively higher potential to be easily incorporated into daily lifestyle. Using the arm swing motion in walking, this paper proposes a regression model-based method for longitudinal walking speed estimation using a wrist-worn IMU. A novel kinematic variable is proposed, which finds the wrist acceleration in the principal axis (i...
2016: PloS One
https://www.readbyqxmd.com/read/27762669/the-validation-and-application-of-inertial-measurement-units-to-springboard-diving
#13
Cherie Walker, Peter Sinclair, Kenneth Graham, Stephen Cobley
Inertial Measurement Units (IMUs) may offer an ecologically valid, reliable, and practical method for biomechanical performance analysis. With such potential in mind, Part 1 of this study examined the accuracy of IMUs gyroscopes with an optical system (Cortex 3.3). A calibration formula standardised the IMUs angular velocity output with the optical system. The percentage differences between the two measures = 0.5% (p < 0.05), suggest IMU's efficacy for application. In Part 2, the aim was to examine and understand how dive flight angular velocity time series plots change and increase according to dive degree of difficulty...
October 20, 2016: Sports Biomechanics
https://www.readbyqxmd.com/read/27761576/evaluation-of-inertial-measurement-units-as-a-novel-method-for-kinematic-gait-evaluation-in-dogs
#14
Felix M Duerr, Alexandra Pauls, Chris Kawcak, Kevin Haussler, Gina Bertocci, Valerie Moorman, Melissa King
OBJECTIVE: To evaluate the use of inertial measurement units (IMU) for quantification of canine limb kinematics. METHODS: Sixteen clinically healthy, medium-sized dogs were enrolled. Baseline kinematic data were acquired using an optical motion capture system. Following this baseline data acquisition, a harness system was used for attachment of IMU to the animals. Optical kinematic data of dogs with and without the harness were compared to evaluate the influence of the harness on gait parameters...
October 20, 2016: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/27679933/controlled-banked-turns-in-coleopteran-flight-measured-by-a-miniature-wireless-inertial-measurement-unit
#15
Yao Li, Feng Cao, Tat Thang Vo Doan, Hirotaka Sato
The mechanisms and principles of insect flight have long been investigated by researchers working on micro and nano air vehicles (MAVs/NAVs). However, studies of insect flight maneuvers require high speed filming and high spatial resolution in a small experimental space, or the tethering of the insect to a fixed place. Under such artificial conditions, the insects may deviate its flying behavior from that of regular flight. In this study, we mounted a tiny wireless system, or 'backpack', on live beetles (Mecynorrhina torquata; length 62 ± 8 mm; mass 7...
2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27661867/innovative-self-calibration-method-for-accelerometer-scale-factor-of-the-missile-borne-rins-with-fiber-optic-gyro
#16
Qian Zhang, Lei Wang, Zengjun Liu, Yiming Zhang
The calibration of an inertial measurement unit (IMU) is a key technique to improve the preciseness of the inertial navigation system (INS) for missile, especially for the calibration of accelerometer scale factor. Traditional calibration method is generally based on the high accuracy turntable, however, it leads to expensive costs and the calibration results are not suitable to the actual operating environment. In the wake of developments in multi-axis rotational INS (RINS) with optical inertial sensors, self-calibration is utilized as an effective way to calibrate IMU on missile and the calibration results are more accurate in practical application...
September 19, 2016: Optics Express
https://www.readbyqxmd.com/read/27612973/from-big-data-to-rich-data-the-key-features-of-athlete-wheelchair-mobility-performance
#17
R M A van der Slikke, M A M Berger, D J J Bregman, H E J Veeger
Quantitative assessment of an athlete׳s individual wheelchair mobility performance is one prerequisite needed to evaluate game performance, improve wheelchair settings and optimize training routines. Inertial Measurement Unit (IMU) based methods can be used to perform such quantitative assessment, providing a large number of kinematic data. The goal of this research was to reduce that large amount of data to a set of key features best describing wheelchair mobility performance in match play and present them in meaningful way for both scientists and athletes...
October 3, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27612100/on-the-orientation-error-of-imu-investigating-static-and-dynamic-accuracy-targeting-human-motion
#18
Luca Ricci, Fabrizio Taffoni, Domenico Formica
The accuracy in orientation tracking attainable by using inertial measurement units (IMU) when measuring human motion is still an open issue. This study presents a systematic quantification of the accuracy under static conditions and typical human dynamics, simulated by means of a robotic arm. Two sensor fusion algorithms, selected from the classes of the stochastic and complementary methods, are considered. The proposed protocol implements controlled and repeatable experimental conditions and validates accuracy for an extensive set of dynamic movements, that differ in frequency and amplitude of the movement...
2016: PloS One
https://www.readbyqxmd.com/read/27589763/a-sensor-fusion-method-based-on-an-integrated-neural-network-and-kalman-filter-for-vehicle-roll-angle-estimation
#19
Leandro Vargas-Meléndez, Beatriz L Boada, María Jesús L Boada, Antonio Gauchía, Vicente Díaz
This article presents a novel estimator based on sensor fusion, which combines the Neural Network (NN) with a Kalman filter in order to estimate the vehicle roll angle. The NN estimates a "pseudo-roll angle" through variables that are easily measured from Inertial Measurement Unit (IMU) sensors. An IMU is a device that is commonly used for vehicle motion detection, and its cost has decreased during recent years. The pseudo-roll angle is introduced in the Kalman filter in order to filter noise and minimize the variance of the norm and maximum errors' estimation...
2016: Sensors
https://www.readbyqxmd.com/read/27585182/ambulatory-activity-classification-with-dendogram-based-support-vector-machine-application-in-lower-limb-active-exoskeleton
#20
Oishee Mazumder, Ananda Sankar Kundu, Prasanna Kumar Lenka, Subhasis Bhaumik
Ambulatory activity classification is an active area of research for controlling and monitoring state initiation, termination, and transition in mobility assistive devices such as lower-limb exoskeletons. State transition of lower-limb exoskeletons reported thus far are achieved mostly through the use of manual switches or state machine-based logic. In this paper, we propose a postural activity classifier using a 'dendogram-based support vector machine' (DSVM) which can be used to control a lower-limb exoskeleton...
August 21, 2016: Gait & Posture
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