Middle ear vibration with stiff and flexible shape memory prosthesis

Rusinek, Rafał; Weremczuk, Andrzej; Szymański, Marcin; Warmiński, Jerzy

doi:10.1016/j.ijmecsci.2018.09.040

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…The elastic thin plate is one of the most common simplified models, such as turbine blades, water tanks, and thin-walled structures on equipment casings that can be simplified to elastic sheet problems [13][14][15][16][17][18][19]. For the fluid-solid coupling problem of elastic thin plates, the research mainly focuses on the numerical analysis of dynamic and static problems of coupled systems [15,[20][21][22]. In the study of the description of the deformable plate and fluid interaction, the compatible Lagrangian-Eulerian method can be used.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on vibration characteristics of fluid-solid coupling cantilever thin aluminum plate

Yinhanga¹,

Hanyanga²,

Meilingb³

et al. 2020

J. vibroeng.

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Compared with the general environment, the modal characteristics of structures under fluid-solid coupling will show great differences. Reasonable experimental methods can provide reliable conclusion support for fluid-solid coupling research. In order to explore the modal characteristics of structures under the action of fluids, the interference and finite element numerical calculation methods are used to study the dry and wet modal characteristics of the cantilever aluminum plate under fluid-solid coupling. According to the amplitude fluctuation resonance discrimination method, the resonant frequency and mode of the cantilever aluminum plate under different working conditions are obtained accurately. Experiments show that the effect of the fluid will greatly reduce the natural frequency of the structure and have little effect on the vibration mode. With the gradual increase of the fluid-solid coupling interface, the natural frequency drop rate and the amplitude at the gas-liquid interface remain consistent, and slightly ahead of the amplitude characteristics. At the same time, for each mode with the same characteristics, the frequency decreasing trend is linear, such as the first few pure bending vibration modes, and the first few bending and twisting combined vibration modes contain first-order twisting vibration. The experimental results and the finite element numerical results are in good agreement, which shows that the electronic speckle method is a good test method for studying fluid-solid coupling modes. Most importantly, the experimental conclusion has reliable reference value for practical engineering applications.

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Section: Introductionmentioning

confidence: 99%

Experimental study on vibration characteristics of fluid-solid coupling cantilever thin aluminum plate

Yinhanga¹,

Hanyanga²,

Meilingb³

et al. 2020

J. vibroeng.

View full text Add to dashboard Cite

show abstract

Section: Nonlinear Ear Modelmentioning

confidence: 99%

“…The SMA coupler could be a self-clamp element when heating without any external force. The SMA element used in the middle ear is described as a five-order polynomial, but the newest findings indicate that a three-order function is enough for small vibrations that occur in the ear structure [19,20]. Thus, the clip (coupler) is described by the linear (k CLIP ) and nonlinear (k CLIP3 ) stiffness coefficients and the linear (viscous) damping c CLIP in Equation (2).…”

Section: Nonlinear Ear Modelmentioning

confidence: 99%

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

et al. 2021

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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.

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“…Nonlinear properties of tendons and ligaments in the middle ear are two separate problems that should be discussed here, as nonlinearities can significantly influence system dynamics. The problem has been mentioned in several papers, e.g., [ 12 , 13 , 14 , 15 , 16 ]. For example, Cheng and Gan investigated the nonlinear mechanical properties of the anterior malleolar ligament (AML) via experimental measurement and the material modelling point of view [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Biomechanics of the Human Middle Ear with Viscoelasticity of the Maxwell and the Kelvin–Voigt Type and Relaxation Effect

2020

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The middle ear is one of the smallest biomechanical systems in the human body and is responsible for the hearing process. Hearing is modelled in different ways and by various methods. In this paper, three-degree-of-freedom models of the human middle ear with different viscoelastic properties are proposed. Model 1 uses the Maxwell type viscoelasticity, Model 2 is based on the Kelvin–Voigt viscoelasticity, and Model 3 uses the Kelvin–Voigt viscoelasticity with relaxation effect. The primary aim of the study is to compare the models and their dynamic responses to a voice excitation. The novelty of this study lies in using different models of viscoelasticity and relaxation effect that has been previously unstudied. First, mathematical models of the middle ear were built, then they were solved numerically by the Runge–Kutta procedure and finally, numerical results were compared with those obtained from experiments carried out on the temporal bone with the Laser Doppler Vibrometer. The models exhibit differences in the natural frequency and amplitudes near the second resonance. All analysed models can be used for modelling the rapidly changing processes that occur in the ear and to control active middle ear implants.

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Middle ear vibration with stiff and flexible shape memory prosthesis

Cited by 5 publications

References 23 publications

Experimental study on vibration characteristics of fluid-solid coupling cantilever thin aluminum plate

Experimental study on vibration characteristics of fluid-solid coupling cantilever thin aluminum plate

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

Biomechanics of the Human Middle Ear with Viscoelasticity of the Maxwell and the Kelvin–Voigt Type and Relaxation Effect

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