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Autonomous Sensor System for Low-Capacity Wind Turbine Blade Vibration Measurement

Muxica, Diego (author), Rivera, Sebastian (author), Orchard, Marcos E. (author), Ahumada, Constanza (author), Jaramillo, Francisco (author), Bravo, Felipe (author), Gutiérrez, José M. (author), Astroza, Rodrigo (author)

This paper presents the design, implementation, and validation of an on-blade sensor system for remote vibration measurement for low-capacity wind turbines. The autonomous sensor system was deployed on three wind turbines, with one of them operating in harsh weather conditions in the far south of Chile. The system recorded the acceleration...

journal article 2024

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Individual and joint body movement assessed by wearable sensing as a predictor of attraction in speed dates

Vargas Quiros, J.D. (author), Kapcak, Oyku (author), Hung, H.S. (author), Cabrera Quiros, L.C. (author)

Interpersonal attraction is known to motivate behavioral responses in the person experiencing this subjective phenomenon. Such responses may involve the imitation of behavior, as in mirroring or mimicry of postures or gestures, which have been found to be associated with the desire to be liked by an interlocutor. Speed dating provides a...

journal article 2023

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Comfort Wearables for In-Flight Sitting Posture Recognition

Yao, X. (author), Yang, Y. (author), Vledder, G. (author), Xu, J. (author), Song, Y. (author), Vink, P. (author)

Wearables are used to recognize human activities in various applications. However, there is limited evidence on the comfort feelings in using wearables, which is crucial for the adoption and long-term engagement of users in those applications. In this paper, we propose the concept of comfort wearables in the context of in-flight posture...

journal article 2023

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Dayside Upper-Thermospheric Density Fluctuations as Observed by GRACE and GRACE-FO at ∼500 km Height

Park, Jaeheung (author), van den IJssel, J.A.A. (author), Siemes, C. (author)

We statistically investigate fluctuation amplitudes (normalized to the background values) of dayside low-/mid-latitude upper-thermospheric mass density as observed by the Gravity Recovery and Climate Experiment (GRACE) and GRACE-Follow-On (GRACE-FO) spacecraft at ∼500 km altitude between 2002 and 2022. There are three new findings in our...

journal article 2023

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Result of the MICROSCOPE weak equivalence principle test

Touboul, Pierre (author), Métris, Gilles (author), Rodrigues, Manuel (author), Bergé, Joel (author), Robert, Alain (author), Baghi, Quentin (author), André, Yves (author), Bedouet, Judicael (author), Visser, P.N.A.M. (author)

The space mission MICROSCOPE dedicated to the test of the equivalence principle (EP) operated from April 25, 2016 until the deactivation of the satellite on October 16, 2018. In this analysis we compare the free-fall accelerations (a _A and a _B) of two test masses in terms of the Eötvös parameter η ( A,B ) = 2 a A − a B a...

journal article 2022

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Relative Kinematics Estimation Using Accelerometer Measurements

Mishra, A. (author), Rajan, R.T. (author)

Given a network of N static nodes in D-dimensional space and the pairwise distances between them, the challenge of estimating the coordinates of the nodes is a well-studied problem. However, for numerous application domains, the nodes are mobile and the estimation of relative kinematics (e.g., position, velocity and acceleration) is a...

conference paper 2022

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Use of low-cost accelerometers for landslides monitoring: results from a flume experiment

Otero, Malena D’Elia (author), de Abreu, Ana Elisa Silva (author), Askarinejad, A. (author), Guimarães, Marcela Penha Pereira (author), de Macedo, Eduardo Soares (author), Corsi, Alessandra Cristina (author), de Almeida, Rynaldo Zanotele Hemerly (author)

Early Warning Systems (EWS) are non-structural measures for landslides disaster prevention. They are based on the detection of impending failure signals. The results of a landslide simulation experiment where accelerometers were used to identify pre-failure signals are presented in this paper. Landslide was simulated in a tilting flume filled...

journal article 2022

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The Stumblemeter: Design and Validation of a System That Detects and Classifies Stumbles during Gait

den Hartog, D.D.G. (author), Harlaar, J. (author), Smit, G. (author)

Stumbling during gait is commonly encountered in patients who suffer from mild to serious walking problems, e.g., after stroke, in osteoarthritis, or amputees using a lower leg prosthesis. Instead of self-reporting, an objective assessment of the number of stumbles in daily life would inform clinicians more accurately and enable the evaluation...

journal article 2021

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Experimental Evaluation of Smartphone Accelerometer and Low-Cost Dual Frequency GNSS Sensors for Deformation Monitoring

Lăpădat, Alexandru M. (author), Tiberius, C.C.J.M. (author), Teunissen, P.J.G. (author)

Smartphone accelerometers and low-cost Global Navigation Satellite System (GNSS) equipment have faced rapid and important advancement, opening a new door to deformation monitoring applications such as landslide, plate tectonics and structural health monitoring (SHM). The precision potential and operational feasibility of the equipment play an...

journal article 2021

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Gas-surface interactions modelling influence on satellite aerodynamics and thermosphere mass density

March, G. (author), van den IJssel, J.A.A. (author), Siemes, C. (author), Visser, P.N.A.M. (author), Doornbos, Eelco N. (author), Pilinski, Marcin (author)

The satellite acceleration data from the CHAMP, GRACE, GOCE, and Swarm missions provide detailed information on the thermosphere density over the last two decades. Recent work on reducing errors in modelling the spacecraft geometry has greatly reduced scale differences between the thermosphere data sets from these missions. However, residual...

journal article 2021

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Comparison of Thermospheric Winds Measured by GOCE and Ground-Based FPIs at Low and Middle Latitudes

Jiang, Guoying (author), Xiong, Chao (author), Stolle, Claudia (author), Xu, Jiyao (author), Yuan, Wei (author), Makela, Jonathan J. (author), Harding, Brian J. (author), Kerr, Robert B. (author), March, G. (author), Siemes, C. (author)

The re-estimates of thermospheric winds from the Gravity field and steady-state Ocean Circulation Explorer (GOCE) accelerometer measurements were released in April 2019. In this study, we compared the new-released GOCE crosswind (cross-track wind) data with the horizontal winds measured by four Fabry-Perot interferometers (FPIs) located at...

journal article 2021

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Distinct cortical activity patterns in Parkinson's disease and essential tremor during a bimanual tapping task

Luft, Frauke (author), Sharifi, Sarvi (author), Mugge, W. (author), Schouten, A.C. (author), Bour, Lo J. (author), Van Rootselaar, Anne Fleur (author), Veltink, Peter H. (author), Heida, Tijtske (author)

Background: Parkinson's disease (PD) and essential tremor (ET) are neurodegenerative diseases characterized by movement deficits. Especially in PD, maintaining cyclic movement can be significantly disturbed due to pathological changes in the basal ganglia and the cerebellum. Providing external cues improves timing of these movements in PD and...

journal article 2020

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Robust Plug-and-Play Joint Axis Estimation Using Inertial Sensors

Olsson, Fredrik (author), Kok, M. (author), Seel, Thomas (author), Halvorsen, Kjartan (author)

Inertial motion capture relies on accurate sensor-to-segment calibration. When two segments are connected by a hinge joint, for example in human knee or finger joints as well as in many robotic limbs, then the joint axis vector must be identified in the intrinsic sensor coordinate systems. Methods for estimating the joint axis using...

journal article 2020

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Inertial sensors—applications and challenges in a nutshell

Seel, Thomas (author), Kok, M. (author), McGinnis, Ryan S. (author)

This editorial provides a concise introduction to the methods and applications of inertial sensors. We briefly describe the main characteristics of inertial sensors and highlight the broad range of applications as well as the methodological challenges. Finally, for the reader’s guidance, we give a succinct overview of the papers included in...

contribution to periodical 2020

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A Power Spectral Density-Based Method to Detect Tremor and Tremor Intermittency in Movement Disorders

Luft, Frauke (author), Sharifi, Sarvi (author), Mugge, W. (author), Schouten, A.C. (author), Bour, Lo J. (author), van Rootselaar, Anne Fleur (author), Veltink, Peter H. (author), Heida, Tijtske (author)

There is no objective gold standard to detect tremors. This concerns not only the choice of the algorithm and sensors, but methods are often designed to detect tremors in one specific group of patients during the performance of a specific task. Therefore, the aim of this study is twofold. First, an objective quantitative method to detect...

journal article 2019

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Characterising Angular Accelerometers using a Two-Axis Motion Simulator

Jatiningrum, D. (author)

Fault-Tolerant Flight Control (FTFC) systems reconfigure aircraft flight control laws to help restore a controlled flight and preserve acceptable performance under systemfaults. A typical approach to achieve fault tolerance is using inertial sensor measurementswhich can provide robustness to abrupt changes in the aircraft dynamics. This method...

doctoral thesis 2018

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Non-linear bulk micromachined accelerometer for high sensitivity applications

Middelburg, L.M. (author), el Mansouri, B. (author), Poelma, René H. (author), Zhang, Kouchi (author), van Zeijl, H.W. (author), Wei, J. (author)

This work describes the design, modelling and realisation of the mechanical part of a non-linear MEMS accelerometer intended for large displacement behaviour. For this, a mass/spring system was designed with an extremely low resonance frequency. In this work the mechanical behaviour was verified by measurements done using an optical setup,...

conference paper 2018

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Towards Analyzing and Predicting the Experience of Live Performances with Wearable Sensing

Gedik, E. (author), Cabrera Quiros, L.C. (author), Martella, Claudio (author), Englebienne, Gwenn (author), Hung, H.S. (author)

We present an approach to interpret the response of audiences to live performances by processing mobile sensor data. We apply our method on three different datasets obtained from three live performances, where each audience member wore a single tri-axial accelerometer and proximity sensor embedded inside a smart sensor pack. Using these...

journal article 2018

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Using the GOCE star trackers for validating the calibration of its accelerometers

Visser, P.N.A.M. (author)

A method for validating the calibration parameters of the six accelerometers on board the Gravity field and steady-state Ocean Circulation Explorer (GOCE) from star tracker observations that was originally tested by an end-to-end simulation, has been updated and applied to real data from GOCE. It is shown that the method provides estimates of...

journal article 2017

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Isolating the location of scour-induced stiffness loss in bridges using local modal behaviour

Prendergast, L.J. (author), Gavin, Kenneth (author), Hester, David (author)

Detecting scour by analysing bridge vibrations is receiving an increasing amount of attention in the literature. Others have considered changes in natural frequency to indicate the presence of scour damage; however, little work has been reported on identifying the location of a scour hole based on vibration measurements. In this paper, a...

journal article 2017