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Biomechanical Study of the Vestibular System of the Inner Ear Using a Numerical Method 用数值方法研究内耳前庭系统的生物力学
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI: 10.1016/j.piutam.2017.08.040
Carla F. Santos , Jorge Belinha , Fernanda Gentil , Marco Parente , Bruno Areias , Renato Natal Jorge
{"title":"Biomechanical Study of the Vestibular System of the Inner Ear Using a Numerical Method","authors":"Carla F. Santos ,&nbsp;Jorge Belinha ,&nbsp;Fernanda Gentil ,&nbsp;Marco Parente ,&nbsp;Bruno Areias ,&nbsp;Renato Natal Jorge","doi":"10.1016/j.piutam.2017.08.040","DOIUrl":"10.1016/j.piutam.2017.08.040","url":null,"abstract":"<div><p>The inner ear has two main parts, the cochlea, dedicated to hearing, and the vestibular system, dedicated to balance. Dizziness and vertigo are the main symptoms related to vestibular disorders, which commonly affects older people. In order to eliminate these symptoms a vestibular rehabilitation is performed; this consists in a range of movements of the head, known as maneuvers, performed by a clinical professional. This procedure does not always work as expected. The aim of this work is to contribute to a better understanding on how the vestibular system works. This knowledge will help in the development of new techniques that will facilitate a more efficient rehabilitation. In order to achieve that goal, a three-dimensional numerical model of the vestibular system, containing the fluids which promote the body balance, was constructed. The vestibular components will be discretized using the finite element method and the fluid flow will be analyzed using the Smoothed Particle Hydrodynamics.</p><p>The results obtained with the numerical model of the semicircular canal built to study the rehabilitation process are presented and compared with other authors. The solution achieved is similar with literature.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"24 ","pages":"Pages 30-37"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.040","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Laser Post Annealing of Cold-sprayed Al–Ni Composite Coatings for Green Energy Tasks 用于绿色能源任务的冷喷涂Al-Ni复合涂层激光后退火
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI: 10.1016/j.piutam.2017.06.010
Pavel A. Podrabinnik , Igor V. Shishkovsky
{"title":"Laser Post Annealing of Cold-sprayed Al–Ni Composite Coatings for Green Energy Tasks","authors":"Pavel A. Podrabinnik ,&nbsp;Igor V. Shishkovsky","doi":"10.1016/j.piutam.2017.06.010","DOIUrl":"https://doi.org/10.1016/j.piutam.2017.06.010","url":null,"abstract":"<div><p>This paper considerers the principal feasibility of using cold gas dynamic spraying with laser post treatment technique to create Al-Ni composite coatings. The prepared mixture of two powders was coated on an aluminum substrate and laser annealed. As a result the AlxNy intermetallic phases were observed in the coating. Obtained laser-annealed coatings were studied by means of optical and electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometry and compared with as-sprayed coatings. Effects of laser processing parameters, such as scanning speed, power and beam shape on microstructural evolution of the composite coatings were discussed and optimal regimes for laser assisted CS were determined.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"23 ","pages":"Pages 108-113"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.06.010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138224518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Methods for Controlling Particle Size in Corrosion-resistant Steel Powders 控制耐蚀钢粉末粒度的方法
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI: 10.1016/j.piutam.2017.06.013
T. Tarasova, A. Filatova
{"title":"Methods for Controlling Particle Size in Corrosion-resistant Steel Powders","authors":"T. Tarasova,&nbsp;A. Filatova","doi":"10.1016/j.piutam.2017.06.013","DOIUrl":"10.1016/j.piutam.2017.06.013","url":null,"abstract":"<div><p>This work considers the possibilities of using static analysis and scanning electron microscopy techniques to determine the properties of disperse materials, i.e. corrosion resistant steel grades 12X18N9T and 20X13, taken into account in the selective laser melting technique.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"23 ","pages":"Pages 130-137"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.06.013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Control of Complicated Stress Oscillations in FGPM Thin Plates FGPM薄板复杂应力振荡的控制
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-03-22 DOI: 10.1016/j.piutam.2017.03.027
Fumihiro Ashida , Takuya Morimoto , Hidenori Ozaki
{"title":"Control of Complicated Stress Oscillations in FGPM Thin Plates","authors":"Fumihiro Ashida ,&nbsp;Takuya Morimoto ,&nbsp;Hidenori Ozaki","doi":"10.1016/j.piutam.2017.03.027","DOIUrl":"10.1016/j.piutam.2017.03.027","url":null,"abstract":"<div><p>Analytical solutions to one-dimensional electro-elastodynamic problems in functionally graded piezoelectric material thin plates subjected to impact pressure are obtained. In the case where both surfaces of the thin plate are free of electric charge, the stress oscillation is periodic when the mechanical impedance is independent of the space-variable, whereas it is complicated when the impedance depends on the space-variable. In the case where the voltage between both surfaces of the thin plate is zero, the stress oscillation is complicated whether the impedance is independent of or dependent on the space-variable. The complicated stress oscillations are found to be suppressed completely by applying specific voltages determined from the analytical solution.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"20 ","pages":"Pages 42-49"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55245464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Hydrodynamic Boundary Conditions Derived from Onsager's Variational Principle 由Onsager变分原理导出的水动力边界条件
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-03-22 DOI: 10.1016/j.piutam.2017.03.020
Xinpeng Xu, Tiezheng Qian
{"title":"Hydrodynamic Boundary Conditions Derived from Onsager's Variational Principle","authors":"Xinpeng Xu,&nbsp;Tiezheng Qian","doi":"10.1016/j.piutam.2017.03.020","DOIUrl":"10.1016/j.piutam.2017.03.020","url":null,"abstract":"<div><p>In addition to hydrodynamic equations in the bulk region, proper hydrodynamic boundary conditions are essential to theoretically understanding and numerically simulating the hydrodynamics of many soft matter systems, e.g. two-phase flows on solid surfaces and viscoelastic fluids on solid surfaces. In this work, we show that Onsager's variational principle, first proposed by Lars Onsager in his seminal work in 1931, provides a convenient instrument for deriving not only hydrodynamic equations in the bulk region but also thermodynamically consistent hydrodynamic boundary conditions. To demonstrate its applications, we consider one-component liquid-vapor flows and immiscible two-phase flows on solid surfaces where moving contact line is involved.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"20 ","pages":"Pages 144-151"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55245181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Lagrangian Measurements in Turbulent Thermal Convection: About the Inhomogeneity of the Velocity and Temperature Fields 湍流热对流中的拉格朗日测量:关于速度场和温度场的不均匀性
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-03-22 DOI: 10.1016/j.piutam.2017.03.016
Olivier Liot , Julien Salort , Fanny Seychelles , Yoann Gasteuil , Jean-François Pinton , Francesca Chillà
{"title":"Lagrangian Measurements in Turbulent Thermal Convection: About the Inhomogeneity of the Velocity and Temperature Fields","authors":"Olivier Liot ,&nbsp;Julien Salort ,&nbsp;Fanny Seychelles ,&nbsp;Yoann Gasteuil ,&nbsp;Jean-François Pinton ,&nbsp;Francesca Chillà","doi":"10.1016/j.piutam.2017.03.016","DOIUrl":"10.1016/j.piutam.2017.03.016","url":null,"abstract":"<div><p>Turbulent thermal convection is a complex problem: the flow is forced at almost all scales, because of the presence of both large scale circulation and small scale plumes. Moreover the difference of density induced by temperature adds an ingredient in the basic equations of the flow, so that turbulence could be different from the case of pure mechanical forcing. Mixing is in principle different and probably increased because of the structure of the plumes. Moreover the entire flow is not homogeneous (at least at large scales) and the statistical behaviour can be influenced by the large scale flow. One way to probe all these specific effects is to use a Lagrangian point of view, measuring, for example, Lagrangian transport of velocity and temperature, or heat flux. We will show how the inhomogeneity of the mean temperature and velocity fields affect the heat flux. Then the interactions between the mean fields and the Lagrangian fluctuations will be highlighted.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"20 ","pages":"Pages 112-119"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55245046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Excitation-induced Delayed Onset of Epileptic Poly-spike and Wave Discharges 兴奋诱导的迟发性癫痫性多峰和波放电
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI: 10.1016/j.piutam.2017.08.020
Suyu Liu, Qingyun Wang
{"title":"Excitation-induced Delayed Onset of Epileptic Poly-spike and Wave Discharges","authors":"Suyu Liu,&nbsp;Qingyun Wang","doi":"10.1016/j.piutam.2017.08.020","DOIUrl":"10.1016/j.piutam.2017.08.020","url":null,"abstract":"<div><p>In this paper we employ an improved thalamo-cortical model to uncover the potential generation mechanisms of pS-WD patterns by means of bursting oscillation's analysis approaches in the process of seizures generation at both fast and slow timescales. Interestingly, it is found that the onset of epileptic discharges can be delayed as an increase of excitatory regulating function of the thalamic relay neuronal population on cortical PY. The obtained numerical results show that the initiation of absence seizures arises from the thalamus and the termination of them in the cortex.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 154-159"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55248071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Group Consensus in Networked Mechanical Systems with Communication Delays 具有通信延迟的网络化机械系统中的群体共识
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI: 10.1016/j.piutam.2017.08.014
Jinwei Yu , Jun Liu , Lan Xiang , Jin Zhou
{"title":"Group Consensus in Networked Mechanical Systems with Communication Delays","authors":"Jinwei Yu ,&nbsp;Jun Liu ,&nbsp;Lan Xiang ,&nbsp;Jin Zhou","doi":"10.1016/j.piutam.2017.08.014","DOIUrl":"10.1016/j.piutam.2017.08.014","url":null,"abstract":"<div><p>This paper studies the adaptive group consensus problem of networked mechanical systems formulated by Lagrangian dynamics under directed acyclic network topology by the use of adaptive control scheme based on neural networks. A distributed group consensus algorithm is proposed for such networked mechanical systems with communication delays, and then a simple yet generic criterion on the convergence for such algorithm over directed acyclic topology is established. Furthermore, the effect of time delays on the performance of adaptive group consensus are numerically investigated. It is shown that the networked mechanical systems with communication delays can always reach the group consensus if each subgroup has a directed spanning tree. Subsequently, numerical examples illustrate and visualize the effectiveness and feasibility of the theoretical results.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 107-114"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55247756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Stability Analysis of the Wave Equation with Delayed Boundary Conditions 具有延迟边界条件的波动方程的稳定性分析
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI: 10.1016/j.piutam.2017.08.018
Li Zhang , Gabor Stepan
{"title":"Stability Analysis of the Wave Equation with Delayed Boundary Conditions","authors":"Li Zhang ,&nbsp;Gabor Stepan","doi":"10.1016/j.piutam.2017.08.018","DOIUrl":"10.1016/j.piutam.2017.08.018","url":null,"abstract":"<div><p>Stability of the 1D wave equation with delayed boundary conditions is considered. By means of the traveling wave solution, the original system is transformed into a delay differential equation of neutral type which involves two delays. The complete and exact stability chart is presented for the delayed boundary problem in the parameter plane of the feedback gain between the boundaries and the ratio of the time delays.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"22 ","pages":"Pages 139-145"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55248019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Some Remarks on Moving Sharp Interfaces 关于移动尖锐界面的一些注意事项
Procedia IUTAM Pub Date : 2017-01-01 Epub Date: 2017-08-30 DOI: 10.1016/j.piutam.2017.06.005
Michael Wolff, Michael Böhm
{"title":"Some Remarks on Moving Sharp Interfaces","authors":"Michael Wolff,&nbsp;Michael Böhm","doi":"10.1016/j.piutam.2017.06.005","DOIUrl":"10.1016/j.piutam.2017.06.005","url":null,"abstract":"<div><p>We deal with some aspects of the general (mathematical) modeling of sharp interfaces (i.e. two-dimensional surfaces within a three-dimensional body) without and with own thermodynamical activity (i.e. with interfacial densities, fluxes and supplies). Questions of regularity of the quantities involved are especially addressed. We present a classification of sharp interfaces taking their relation to the remaining body as well as their thermodynamic behavior into account. After a short look into local balances at the interface we discuss a model of a shrinking body (due to mechanical treatment, e.g.) in the framework of sharp singular interfaces.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"23 ","pages":"Pages 52-65"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.06.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55246179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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