Passive Absorber to Reduce the Upper-Limbs Involuntary Tremor

Signal processing of the acceleration measured at the index finger of a Parkinson’s disease (PD) affected patient, as well as of the signals of the Extensor Carpi Radialis longus (ECR) and Flexor Carpi Radialis (FCR) active muscles generating the tremor are processed in this study. The power spectral density (PSD) of these signals are used to obtain information about amplitudes and frequencies of the tremor. ECR and FCR signals measurements show critical peaks at 6.6 Hz and 13.2 Hz in their PSD, the same frequencies are present in the PSD of the acceleration signals. The muscles signals are scaled and used as input moment of a dynamical upper-limb model in the vertical plane, where flexion/extension angular motions are considered at the joints. The parameters optimization for the passive tuned-mass-dampers (TMD) is done using this dynamical model. A Comparison of different TMD configurations and some parametric studies are presented and discussed. 24 Congrès Français de Mécanique Brest, 26 au 30 Août 2019