ACOUSTICAL BEHAVIOR OF THE BONE-IMPLANT INTERFACE: FROM MULTISCALE MODELING TO THE PATIENTS BED

Guillaume Haiat
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Guillaume Haiat is a senior research director in the CNRS and an adjunct professor in the ETS Montreal. He graduated from the Ecole Polytechnique in 1998 in physical acoustics. He defended his PhD study at the French Atomic Energy Commission in 2004 in the domain of ultrasound non-destructive evaluation in the nuclear industry. Since 2004, he works in the domain of bone quantitative ultrasound and biomechanics. He is an associate editor of the journals J Acoust Soc Am, Med Eng Phys, Ultrasound Med Biol and J Mech Med Biol. He is the PI of the BoneImplant project funded by the European Research Council (ERC Consolidator grant) and that focus on the biomechanical determinants of the osseointegration phenomena.

Laboratoire MSME UMR CNRS 8208
Faculté des Sciences et Technologies UPEC

Implants are routinely employed in orthopaedic and dental surgeries. However, risks of failure, which are difficult to anticipate, are still experienced and may have dramatic consequences. Failures are due to degraded bone remodeling at the bone-implant interface, a multiscale phenomenon which remains poorly understood. Implant stability is a key determinant for the surgical success and is determined by the quantity and biomechanical quality of bone tissue around the implant. The primary stability occurs at the moment of implant surgical insertion within bone tissue, while secondary stability is obtained through osseointegration process, a complex multiscale phenomenon, which strongly depends on primary implant stability. The objective of this presentation is to show how acoustical methods may be used in order to provide a better understanding of the multiscale mechanisms at work at the bone-implant interface. Moreover, we will show how acoustical techniques can be used to retrieve the primary and secondary stability of different implants. The first part of this presentation will describe a methodology combining experimental surgery and a multimodality approach. A dedicated coin-shaped implant model is used and has the advantage of providing reproducible and standardized conditions. We will show how quantitative ultrasound may be used to retrieve information on the evolution of the periprosthetic bone biomechanical properties.The second part of this presentation will focus on the development of non-invasive acoustical methods that may be used to retrieve implants stability. The first set-up uses quantitative ultrasound in order to assess dental implant primary and secondary stability. The second device consists in an impact hammer equipped with a piezoelectric sensor that allows to retrieve the primary stability of implants used in total hip replacement. The validation of both approaches has been done in vitro, in silico and in vivo.



NOISE TRANSMISSION AND ABSORPTION OF LIGHTWEIGHT STRUCTURES: AN OVERVIEW AND EXPERIENCE

Bilong Liu
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Dr. Bilong Liu is now a professor at the Qingdao University of Technology, China. He has more than 20 years of experience on vibro-acoustic research after he completed a B.S. degree in physics. He received a PhD in acoustics at the Institute of Acoustics, Chinese Academy of Sciences (CAS) in 2002. Then he worked on noise transmission of aircraft plates at MWL, KTH, Sweden, and received another PhD in applied acoustics from KTH in 2006. From 2007-2017, he had been working as a research professor and leading the group on acoustical materials and structures at the Institute of Acoustics, CAS. Dr. Liu has competed over 20 projects for industries and the government, has authored and co-authored over 100 journal papers, conference articles, and three-volume monograph of "Vibro-Acoustics". He was honored as "Distinguished Professor of CAS" at 2015. His main research interests are acoustical materials, structural vibration and noise, noise induced by fluid-structure interactions, underwater acoustics, active control of sound and vibration, simulation of acoustical device; and etc.

Qingdao University of Technology, China

Improvement of sound insulation and absorption performance without increasing weight or thickness has always been the pursuit of the acoustical society. For an acoustical wave in the low frequency range, neither insulation nor absorption is easy to be dealt with by a thin structure, because the noise insulation is restricted by the so-called mass law and the absorption is limited by the reactance of structural input impedance. In both cases, to achieve effective results, the mass of structures need to be handled properly. This lecture outlines the ongoing effort to improve sound insulation and absorption for lightweight structures. Besides, examples on the vibro-acoustic properties of lightweight plates subject to typical excitations are presented, and novel structures designed for low frequency sound absorption are also reported and discussed.



Unique Vibration Phenomena in High-Speed, Lightweight, Compliant Gears

Robert Parker
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From 2012 Prof. Parker is the L. S. Randolph Professor in the Department of Mechanical Engineering at Virginia Tech, where he also served as Department Head. Previously he was a University Distinguished Professor and the Executive Dean at the University of Michigan-Shanghai Jiao Tong University Joint Institute. He received his M.S. and Ph.D. degrees from the University of California, Berkeley.
Prof. Parker's research examines the vibration of high-speed mechanical systems. One major focus has been the vibration of gear and power transmission systems. He has consulted for several companies internationally where analyses based on his research have solved vibration problems in the automotive, helicopter, wind turbine, and aircraft engine industries. He has also worked on cyclically symmetric systems, axially moving media, centrifugal pendulum vibration absorbers, and disk-spindle systems. His publications have been cited roughly 6000 times.
Prof. Parker is a Fellow of the American Society of Mechanical Engineers (ASME) and the American Association for the Advancement of Science. He received the 2015 ASME N. O. Myklestad Award for "major innovation in vibration research and engineering." The Chinese government selected him as an inaugural awardee for its 1000 Person Plan (千人计划). He has received the US Presidential Early Career Award for Scientists and Engineers ("...the highest honor awarded by the US government to scientists and engineers early in their independent research careers"), the National Science Foundation CAREER, and the US Army Young Investigator Awards, as well as the ASME Gustus Larson Award, Ford Chief Engineer Award, French government Poste Rouge Award, SAE Ralph Teetor Educational Award, ASEE's Global Engineering Educator and Outstanding Faculty Awards, and the Journal of Sound and Vibration Doak Prize.
He serves on the Editorial Board of the Journal of Sound and Vibration and has been Associate Editor for Mechanism and Machine Theory and the ASME Journal of Vibration and Acoustics.
Prof. Parker has been a Visiting Researcher at Polytechnic University of Turin, Risoe National Lab (Denmark), the University of New South Wales, the University of Sydney, Tokyo University, NASA Glenn Research Center, and INSA Lyon.

Department of Mechanical Engineering at Virginia Tech

Gears have recently been aggressively adopted in large aircraft engines because they improve turbine and fan blade efficiency by better matching the optimal speeds of the associated shafts. The high operating speeds and extreme focus on weight reduction lead to gear vibration behaviors that are distinct from conventional gears. High speeds give high excitation frequencies, and lightweight, thin-walled gears have lower natural frequencies. This combination triggers resonance, gyroscopic effects, nonlinearity, vibration of the gears as elastically compliant bodies, and parametric instability. These behaviors are driving development of new models and analysis tools different than what is typical for conventional gears. This presentation will start with industrial examples motivating the work. Next, we describe modeling and analysis of gear vibration using analytical and finite element/contact mechanics methods, with special attention to planetary gears because they are the de facto standard in aerospace applications and because of their interesting dynamics arising from cyclic symmetry. These models, and their experimental validations, will be used to illustrate and explain, without emphasis on mathematical details, the unique vibration behaviors that occur and how the analytical/computational findings have powerful practical implications.



VARIABILITY IN SPEECH AND SPOKEN WORD RECOGNITION

Meghan Clayard
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Dr. Meghan Clayards is an Associate Professor at McGill University with a joint appointment in the Department of Linguistics and the School of Communication Sciences and Disorders. She is also a member of the Centre for Research on Brain, Language and Music and an associate editor for the journal Attention, Perception & Psychophysics. Dr. Clayards obtained a BSc in Linguistics from the University of Victoria in British Columbia and a PhD in Brain and Cognitive Sciences from the University of Rochester in Rochester, NY. She joined McGill after post-doctoral training in Psychology at the University of York in the UK. Her research focuses on the structure of acoustic variability in the speech signal and the role that experience with that structure has on the speech perception system. She also examines how individuals adapt to changes in acoustic patterns. Her recent work has examined individual differences in speech perception in both younger and older adults as well as in second language learners.

Department of Linguistics
School of Communication Sciences and Disorders
McGill University

One of the most important things we do every day is understand spoken language. Identifying spoken words requires the rapid integration of multiple acoustic-phonetic cues in the richly multi-dimensional and transient speech signal. Every meaningful difference in sounds (e.g. the difference between the sounds at the beginning of 'peach' and 'beach') is signalled by multiple acoustic-phonetic cues (e.g. spectral and temporal differences) and often a single cue is not enough for unambiguous perception. Furthermore, the speech signal is notoriously variable and this variability stems from many sources including the talker (e.g. differences in vocal tract size, differences in dialect) and the context (e.g. the immediately following sound, speaking style). This variability and multidimensionality in the signal are part of the central challenge that human speech perception must solve and compared to automatic systems, humans are better able to deal with the variability in particular. This talk will present an overview of challenges related to multidimensionality and variability in spoken word recognition, including sources of variability, and what is known about the solutions, including the role of plasticity. It will also introduce some recent work in my lab investigating differences between individual listeners.


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