scholarly journals Modelling of shape memory alloy oscillator and its application to middle ear structural reconstruction

2018 ◽  
Author(s):  
Rafal Rusinek ◽  
Joanna Rekas
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Middle Ear

scholarly journals Middle ear vibrations with SMA prosthesis. Experimental research

2018 ◽  
Vol 148 ◽  
pp. 12001
Author(s):  
Rafal Rusinek ◽  
Marcin Szymanski ◽  
Grzegorz Teresinski
Keyword(s):  
Transfer Function ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Temporal Bone ◽  
Experimental Research ◽  
Middle Ear ◽  
Round Window ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Middle Ear Prosthesis

The paper focuses on experimental research of a middle ear prosthesis made of shape memory alloy. The prosthesis provides better adjustment to individual patient than classical prosthesis. The shape memory prosthesis is implemented to a fresh temporal bone and vibrations of the round window are recorded by means of the Laser Doppler Vibrometer. Finally, the results are presented in the form of transfer function and compared to the intact and damaged middle ear.

scholarly journals Numerical research of biomechanical system with SMA prosthesis

2018 ◽  
Vol 157 ◽  
pp. 02031
Author(s):  
Andrzej Mitura ◽  
Rafal Rusinek
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Middle Ear ◽  
Quality Index ◽  
Multibody System ◽  
Dynamic Responses ◽  
Numerical Research ◽  
Shape Memory Materials ◽  
Human Middle Ear ◽  
Prosthesis Material

In this paper the modelling of special biomechanical mechanism and application of shape memory materials are presented. The model of the human middle ear is made as multibody system. The basic 3dof ear model of the healthy middle ear is modified to represent the damaged ear. A damaged of the ossicular chainis taken into account by adding gap in visco-elastic joints. In addition, an attempt of the ossicles chain reconstruction through prosthesis made of shape memory alloy is presented. Moreover, a new description of the hysteresis sub-loop which characterise prosthesis material is proposed. Finally, dynamic responses of healthy, damaged and reconstructed models of the middle ear are compared by quality index.

scholarly journals Polyharmonic Vibrations of Human Middle Ear Implanted by Means of Nonlinear Coupler

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5121
Author(s):  
Rafal Rusinek ◽  
Joanna Rekas ◽  
Katarzyna Wojtowicz ◽  
Robert Zablotni
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Middle Ear ◽  
Degrees Of Freedom ◽  
Chaotic Vibrations ◽  
Classical Element ◽  
Irregular Motion ◽  
Lumped Masses ◽  
Nonlinear Coupler ◽  
Human Middle Ear

This paper presents a possibility of quasi-periodic and chaotic vibrations in the human middle ear stimulated by an implant, which is fixed to the incus by means of a nonlinear coupler. The coupler represents a classical element made of titanium and shape memory alloy. A five-degrees-of-freedom model of lumped masses is used to represent the implanted middle ear for both normal and pathological ears. The model is engaged to numerically find the influence of the nonlinear coupler on stapes and implant dynamics. As a result, regions of parameters regarding the quasi-periodic, polyharmonic and irregular motion are identified as new contributions in ear bio-mechanics. The nonlinear coupler causes irregular motion, which is undesired for the middle ear. However, the use of the stiff coupler also ensures regular vibrations of the stapes for higher frequencies. As a consequence, the utility of the nonlinear coupler is proven.

Structure and mobility of martensite variant interfaces in a Cu-Zn-AI shape memory alloy

2003 ◽  
Vol 112 ◽  
pp. 519-522 ◽  
Author(s):  
W. Cai ◽  
J. X. Zhang ◽  
Y. F. Zheng ◽  
L. C. Zhao
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensite Variant

Analysis of the effect of Heat Treatments in the manufacturing process of Shape Memory Alloy Springs

2017 ◽  
Author(s):  
Ricardo Alexandre Amar de Aguiar ◽  
Pedro Manuel Calas Lopes Pacheco ◽  
Brenno Tavares Duarte
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Manufacturing Process ◽  
Heat Treatments

Comparative Analysis of a Tuned Mass Damper Using Steel and a Ni-Ti Shape Memory Alloy

2019 ◽  
Author(s):  
Marcelio Ronnie Dantas de Sá ◽  
Armando Wilmans Nunes da Fonseca Júnior ◽  
Yuri Moraes ◽  
Antonio Almeida Silva
Keyword(s):  
Comparative Analysis ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Tuned Mass Damper ◽  
Mass Damper
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