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https://www.readbyqxmd.com/read/28222002/friction-reduction-through-ultrasonic-vibration-part-1-modelling-intermittent-contact
#1
Eric Vezzoli, Zlatko Virdih, Vincenzo Giamundo, Betty Lemaire-Semail, Frederic Giraud, Tomaz Rodic, Djordje Peric, Michael Adams
Ultrasonic vibration is employed to modify the friction of a finger pad in way that induces haptic sensations. A combination of intermittent contact and squeeze film levitation has been previously proposed as the most probable mechanism. In this paper, in order to understand the underlying principles that govern friction modulation by intermittent contact, numerical models based on finite element (FE) analysis and also a spring-Coulombic slider are developed. The physical input parameters for the FE model are optimised by measuring the contact phase shift between a finger pad and a vibrating plate...
February 17, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28222001/friction-reduction-through-ultrasonic-vibration-part-2-experimental-evaluation-of-intermittent-contact-and-squeeze-film-levitation
#2
Thomas Sednaoui, Eric Vezzoli, Brygida Maria Dzidek, Betty Lemaire-Semail, Cedrick Chappaz, Michael Adams
In part 1 of the current study of haptic displays, a finite element (FE) model of a finger exploring a plate vibrating out-of-plane at ultrasonic frequencies was developed as well as a spring-frictional slider model. It was concluded that the reduction in friction induced by the vibrations could be ascribed to ratchet mechanism as a result of intermittent contact. The relative reduction in friction calculated using the FE model could be superimposed onto an exponential function of a dimensionless group defined from relevant parameters...
February 17, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28130556/the-new-vestibular-stimuli-sound-and-vibration-anatomical-physiological-and-clinical-evidence
#3
REVIEW
Ian S Curthoys
The classical view of the otoliths-as flat plates of fairly uniform receptors activated by linear acceleration dragging on otoconia and so deflecting the receptor hair bundles-has been replaced by new anatomical and physiological evidence which shows that the maculae are much more complex. There is anatomical spatial differentiation across the macula in terms of receptor types, hair bundle heights, stiffness and attachment to the overlying otolithic membrane. This anatomical spatial differentiation corresponds to the neural spatial differentiation of response dynamics from the receptors and afferents from different regions of the otolithic maculae...
January 27, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28125270/response-to-tendon-vibration-questions-the-underlying-rationale-of-proprioceptive-training
#4
Anat Vilnai Lubetzky, Sarah Westcott McCoy, Robert Price, Deborah Kartin
CONTEXT:  Proprioceptive training on compliant surfaces is used to rehabilitate and prevent ankle sprains. The ability to improve proprioceptive function via such training has been questioned. Achilles tendon vibration is used in motor-control research as a form of proprioceptive stimulus. Using measures of postural steadiness with nonlinear measures to elucidate control mechanisms, tendon vibration can be applied to investigate the underlying rationale of proprioceptive training. OBJECTIVE:  To test whether the effect of vibration on young adults' postural control depended on the support surface...
January 26, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28117740/a-low-frequency-fbg-accelerometer-with-symmetrical-bended-spring-plates
#5
Fufei Liu, Yutang Dai, Joseph Muna Karanja, Minghong Yang
To meet the requirements for low-frequency vibration monitoring, a new type of FBG (fiber Bragg grating) accelerometer with a bended spring plate is proposed. Two symmetrical bended spring plates are used as elastic elements, which drive the FBG to produce axial strains equal in magnitude but opposite in direction when exciting vibrations exist, leading to doubling the wavelength shift of the FBG. The mechanics model and a numerical method are presented in this paper, with which the influence of the structural parameters on the sensitivity and the eigenfrequency are discussed...
January 22, 2017: Sensors
https://www.readbyqxmd.com/read/28113602/vibrotactile-compliance-feedback-for-tangential-force-interaction
#6
Seongkook Heo, Geehyuk Lee
This paper presents a method to generate a haptic illusion of compliance using a vibrotactile actuator when a tangential force is applied to a rigid surface. The novel method builds on a conceptual compliance model where a physical object moves on a textured surface in response to a tangential force. The method plays vibration patterns simulating friction-induced vibrations as an applied tangential force changes. We built a prototype consisting of a two-dimensional tangential force sensor and a surface transducer to test the effectiveness of the model...
August 30, 2016: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28102524/heat-transfer-capability-of-ethylene-glycol-water-based-nanofluids-containing-graphene-nanoplatelets-design-and-thermophysical-profile
#7
D Cabaleiro, L Colla, S Barison, L Lugo, L Fedele, S Bobbo
This research aims at studying the stability and thermophysical properties of nanofluids designed as dispersions of sulfonic acid-functionalized graphene nanoplatelets in an (ethylene glycol + water) mixture at (10:90)% mass ratio. Nanofluid preparation conditions were defined through a stability analysis based on zeta potential and dynamic light scattering (DLS) measurements. Thermal conductivity, dynamic viscosity, and density were experimentally measured in the temperature range from 283.15 to 343.15 K and nanoparticle mass concentrations of up to 0...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28057352/sigmoid-sinus-cortical-plate-dehiscence-induces-pulsatile-tinnitus-through-amplifying-sigmoid-sinus-venous-sound
#8
Shan Tian, Lizhen Wang, Jiemeng Yang, Rui Mao, Zhaohui Liu, Yubo Fan
Sigmoid sinus cortical plate dehiscence (SSCPD) is common in pulsatile tinnitus (PT) patients, and is treated through SSCPD resurfacing surgery in clinic, but the bio-mechanism is not clear as so far. This study aimed to clarify the bio-mechanism of PT sensation induced by SSCPD, and quantify the relationship of cortical plate (CP) thickness and PT sensation intensity. It was hypothesized that SSCPD would induce PT through significantly amplifying sigmoid sinus (SS) venous sound in this study. Finite element (FE) analysis based on radiology data of typical patient was used to verify this hypothesis, and was validated with clinical reports...
February 8, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28012413/long-thickness-extensional-waves-in-thin-film-bulk-acoustic-wave-filters-affected-by-interdigital-electrodes
#9
Jing Liu, Jianke Du, Ji Wang, Jiashi Yang
We studied free vibrations of thin-film bulk acoustic wave filters with interdigital electrodes theoretically using the scalar differential equations by Tiersten and Stevens. The filters are made from AlN or ZnO films on Si substrates with ground and driving electrodes. They operate with thickness-extensional modes. The basic vibration characteristics including resonant frequencies and mode shapes were obtained. Their dependence on various geometric parameters was examined. It was found that for properly design filters there exist trapped modes whose vibrations are strong in regions with a driving electrode and decay away from the electrode edges...
March 2017: Ultrasonics
https://www.readbyqxmd.com/read/27973354/a-diffraction-correction-for-storage-and-loss-moduli-imaging-using-radiation-force-based-elastography
#10
Eliana Budelli, Javier Brum, Miguel Bernal, Thomas Deffieux, Mickaël Tanter, Patricia Lema, Carlos Negreira, Jean-Luc Gennisson
Noninvasive evaluation of the rheological behavior of soft tissues may provide an important diagnosis tool. Nowadays, available commercial ultrasound systems only provide shear elasticity estimation by shear wave speed assessment under the hypothesis of a purely elastic model. However, to fully characterize the rheological behavior of tissues, given by its storage (G') and loss (G″) moduli, it is necessary to estimate both: shear wave speed and shear wave attenuation. Most elastography techniques use the acoustic radiation force to generate shear waves...
January 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27914423/measurement-of-the-low-wavenumber-component-within-a-turbulent-wall-pressure-by-an-inverse-problem-of-vibration
#11
Damien Lecoq, Charles Pézerat, Fabien Chevillotte, Rémi Bessis
An experimental validation is implemented for the measurement of a weak acoustic component within a turbulent wall pressure by an inverse problem of vibration. The turbulent flow is generated by a forward-facing step in a wind tunnel. In addition to the flow, an acoustic source with a low level excites the plate and plays the role of an additional acoustic component to be identified. The inverse methods called the force analysis technique and the corrected force analysis technique are used to compute the wall pressure fluctuations from the measurement of the plate vibration using an array of 13 accelerometers...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27900951/tuning-the-morphology-luminescence-and-magnetic-properties-of-hexagonal-phase-nagdf4-yb-er-nanocrystals-via-altering-the-addition-sequence-of-the-precursors
#12
Shuwen Zhao, Donglin Xia, Ruimin Zhao, Hao Zhu, Yiru Zhu, Yuda Xiong, Youfa Wang
Hexagonal-phase NaGdF4: Yb, Er upconversion nanocrystals (UCNCs) with tunable morphology and properties were successfully prepared via a thermal decomposition method. The influences of the adding sequence of the precursors on the morphology, chemical composition, luminescence and magnetic properties were investigated by transmission electron microscopy (TEM), inductively coupled plasma-atomic emission spectrometry (ICP-AES), upconversion (UC) spectroscopy, and a vibrating sample magnetometer (VSM). It was found that the resulting nanocrystals, with different sizes ranging from 24 to 224 nm, are in the shape of spheres,  hexagonal plates and flakes; moreover, the composition percentage of Yb(3+)-Er(3+) and Gd(3+) ions was found to vary in a regular pattern with the adding sequence...
January 6, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27898300/a-new-topological-structure-for-the-langevin-type-ultrasonic-transducer
#13
Xiaolong Lu, Junhui Hu, Hanmin Peng, Yuan Wang
In this paper, a new topological structure for the Langevin-type ultrasonic transducer is proposed and investigated. The two cylindrical terminal blocks are conically shaped with four supporting plates each, and two cooling fins are disposed at the bottom of terminal blocks, adjacent to the piezoelectric rings. Experimental results show that it has larger vibration velocity, lower temperature rise and higher electroacoustic energy efficiency than the conventional Langevin transducer. The reasons for the phenomena can be well explained by the change of mass, heat dissipation surface and force factor of the transducer...
March 2017: Ultrasonics
https://www.readbyqxmd.com/read/27893474/hypertrophy-and-explosive-reactive-functioning-in-sedentary-men-following-10-weeks-of-whole-body-vibration
#14
Jens Ebing, Ulf Gast, Christoph Hauptmann, Dieter Felsenberg, Daniel L Belavý
The objective of this study was to determine the impact of vertical (Power-plate; POW) and side-alternating (Galileo; GAL) whole-body vibration exercise on muscle mass and lower-limb neuromuscular function. Forty-three sedentary male subjects (18-30yr) randomized into three groups underwent two upper-body exercise sessions per week for 10 weeks. Two groups of subjects underwent additional squat exercises on the GAL (N=15) or POW (N=14) devices. The third group was control. On magnetic resonance imaging, volume of the thigh muscles was measured...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27863340/solder-joint-failure-localization-of-welded-joint-based-on-acoustic-emission-beamforming
#15
Xiandong Liu, Denghong Xiao, Yingchun Shan, Qiang Pan, Tian He, Yong Gao
A localization approach of welded joint damage is proposed based on acoustic emission (AE) beamforming. In this method, a uniform line array is introduced to detect the AE signal of welded joints in specified area. In order to investigate the influence of fillet and crimping commonly existing in a welded plate structure during the AE wave propagation process, the finite element method (FEM) is applied to simulate the behavior of AE wave in the specimen. The simulation localization results indicate that the proposed localization approach can effectively localize AE sources although there exist the fillet and crimping, and it is also validated by the pencil-lead-broken test on rectangular steel tube with welded joints...
February 2017: Ultrasonics
https://www.readbyqxmd.com/read/27857683/in-vitro-magnetic-stimulation-a-simple-stimulation-device-to-deliver-defined-low-intensity-electromagnetic-fields
#16
Stephanie Grehl, David Martina, Catherine Goyenvalle, Zhi-De Deng, Jennifer Rodger, Rachel M Sherrard
Non-invasive brain stimulation (NIBS) by electromagnetic fields appears to benefit human neurological and psychiatric conditions, although the optimal stimulation parameters and underlying mechanisms remain unclear. Although, in vitro studies have begun to elucidate cellular mechanisms, stimulation is delivered by a range of coils (from commercially available human stimulation coils to laboratory-built circuits) so that the electromagnetic fields induced within the tissue to produce the reported effects are ill-defined...
2016: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/27794334/motion-of-the-cello-bridge
#17
Ailin Zhang, Jim Woodhouse, George Stoppani
This paper presents an experimental investigation of the motion of the bridge of a cello, in the frequency range up to 2 kHz. Vibration measurements were carried out on three different cellos, and the results used to determine the position of the Instantaneous Centre of rotation of the bridge, treated as a rigid body. The assumption of rigid body rotation is shown to give a good approximation up to at least 1 kHz. The instantaneous centre moves from the sound-post side of the bridge at the lowest frequencies towards the bass-bar side at higher frequencies, remaining close to the surface of the top plate of the instrument...
October 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27794327/vibration-energy-analysis-of-a-plate-for-defect-imaging-with-a-scanning-laser-source-technique
#18
Takahiro Hayashi, Misaki Fukuyama
Vibration energies generated by laser irradiation to a plate with a crack were calculated by the semi-analytical finite element method to elucidate the principle of defect imaging using a scanning laser source. For normal incidence in the ablation regime, the incident energy increases when the incident source is located in the vicinity of the crack, owing to the effect of the non-propagating A1 modes. For dipole loading in the thermoelastic regime, the vibration energies are completely different, depending on the position of the crack opening...
October 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27794294/sound-radiation-from-a-fluid-loaded-plate-with-periodic-inhomogeneities-of-finite-width
#19
Yanni Zhang, Hai Huang, Jie Pan
This paper focuses on the frequency-filtering behavior of the structural vibration and sound radiation of a fluid-loaded plate with periodic inhomogeneities of finite width. The passbands of the flexural waves in the plate and the frequency bands of effective sound radiation from the plate are examined for air and water loading conditions. The mechanisms that generate the differences in these two bands are explained by analyzing the dispersion curves of the waves in the plate and the sound radiation behavior of supersonic wavenumber components in the plate vibration...
October 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27787468/effect-of-direct-whole-body-vibration-on-upper-body-muscular-power-in-recreational-resistance-trained-men
#20
Margaret T Jones, Joel Martin, Andrew R Jagim, Jonathan M Oliver
To determine the acute effect of whole body vibration (WBV) on upper body power, 15 men (mean ± SD; age 21.5 ± 2.3 years; height 173.1 ± 6.5 cm; weight 77.2 ± 13.8 kg) with ≥ 1 year resistance training experience and a bench press (BP): body mass ratio ≥ 1.25 participated in a repeated measures crossover design. Session 1 included body composition ((BodPod) 15.76 ± 6.7 % body fat), 3-repetition maximum BP, and familiarization with: seated medicine ball throw (SMBT), plyometric push-up on a force plate (PPU), and vertical WBV platform...
October 13, 2016: Journal of Strength and Conditioning Research
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