Designing a hand rest tremor dynamic vibration absorber using H 2 optimization method

Rahnavard, Mostafa; Hashemi, Mojtaba; Farahmand, Farzam; Dizaji, Ahmad F.

doi:10.1007/s12206-014-0104-8

Cited by 16 publications

(6 citation statements)

References 6 publications

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“…However, the human hand is excited by muscular activity over a range of driving frequencies which may confirm the need for a multi-vibration absorber. Rahnavard et al [ 10 ] used the same hand model and designed a single DOF absorber using the

optimization method.…”

Section: Introductionmentioning

confidence: 99%

“…The absorber was said to be tuned, but the natural frequency of the absorber was 2.775 Hz which is different from the system at 2.24 Hz. Rahnavard et al [ 10 ] excited the two DOF hand model using a random input of two different types instead of the sinusoidal excitation. A single DOF tuned absorber was used to reduce the resting tremor with a 20 cm long beam.…”

Section: Introductionmentioning

confidence: 99%

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Tremor Reduction at the Palm of a Parkinson’s Patient Using Dynamic Vibration Absorber

et al. 2016

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Parkinson’s patients suffer from severe tremor due to an abnormality in their central oscillator. Medications used to decrease involuntary antagonistic muscles contraction can threaten their life. However, mechanical vibration absorbers can be used as an alternative treatment. The objective of this study is to provide a dynamic modeling of the human hand that describes the biodynamic response of Parkinson’s patients and to design an effective tuned vibration absorber able to suppress their pathological tremor. The hand is modeled as a three degrees-of-freedom (DOF) system describing the flexion motion at the proximal joints on the horizontal plane. Resting tremor is modeled as dual harmonic excitation due to shoulder and elbow muscle activation operating at resonance frequencies. The performance of the single dynamic vibration absorber (DVA) is studied when attached to the forearm and compared with the dual DVA tuned at both excitation frequencies. Equations of motion are derived and solved using the complex transfer function of the non-Lagrangian system. The absorber’s systems are designed as a stainless steel alloy cantilevered beam with an attached copper mass. The dual DVA was the most efficient absorber which reduces 98.3%–99.5%, 97.0%–97.3% and 97.4%–97.5% of the Parkinson’s tremor amplitude at the shoulder, elbow and wrist joint.

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optimization method.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tremor Reduction at the Palm of a Parkinson’s Patient Using Dynamic Vibration Absorber

et al. 2016

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“…Upon substituting Eqs. ( 8) and ( 9) into the Lagrange functions one obtains the following motion equations ( ) (10,11) where d f and d f is interacting damping force (vector) between DVA and beam structure. f denotes the external excitation vector applied to the beam's tip.…”

Section: Motion Equationsmentioning

confidence: 99%

“…( 12)-( 14), then substitute them into Eqs. ( 10) and (11), the motion equations of the DVA-beam system is obtained as ( )…”

Section: Motion Equationsmentioning

confidence: 99%

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Optimal design of DVA-beam system by simultaneously optimizing DVA position, mass, damping and stiffness using Particle Swarm optimization

Song

Zeng

Hua

et al. 2022

Preprint

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Using Dynamic Vibration Absorber (DVA) to suppress the vibration of slender structure is promising for its reliable, efficiency and low cost. The main purpose of this study is to suppress the beam vibration by simultaneously optimizing DVA position, mass, damping and stiffness of a DVA-beam system. The motion equations of the DVA-beam system are derived first using the Rayleigh-Ritz method and Lagrange’s equation. Then the Particle Swarm Optimization is then applied to seek the DVA optimal parameters. In which the objective is to minimize the RMS value of the beam tip deflection in a specific time domain. The PSO performance is investigated in three kinds of beam load conditions, that is free vibration, beam subjected to pulse excitation and harmonic excitation. It is observed that in these optimizations the objective function converges quickly. Based on the optimal DVA parameters, the dynamic responses of the optimal DVA-beam system are analyzed and compared with those of bare beam. The results demonstrate that the optimal designed DVA can effectively suppress the beam vibration.

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Design of a Vibration Absorber System for Tremor Reduction in Parkinson Patients Using a Cluster Based Algorithm

Premchand,

Balaram,

Mani

et al. 2024

Springer Proceedings in Mathematics &Amp; Statistics

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Designing a hand rest tremor dynamic vibration absorber using H 2 optimization method

Cited by 16 publications

References 6 publications

Tremor Reduction at the Palm of a Parkinson’s Patient Using Dynamic Vibration Absorber

Tremor Reduction at the Palm of a Parkinson’s Patient Using Dynamic Vibration Absorber

Optimal design of DVA-beam system by simultaneously optimizing DVA position, mass, damping and stiffness using Particle Swarm optimization

Design of a Vibration Absorber System for Tremor Reduction in Parkinson Patients Using a Cluster Based Algorithm

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