A Vibration absorber for absorbing tremors in wrist

In this article, a classic spring damper vibration absorber is designed to reduce the tremor vibration amplitude in patients suffering from tremorous diseases. The absorber is developed as a wristlet placed at the patient’s wrist. It can only move perpendicular to the patient’s elbow and only supports movement in the flexion and extension directions. The patient’s forearm and hand are modeled as two links, Also elbow and wrist are modeled as two frictionless rotational joints which are connected to two pairs of rotational spring-dampers.The absorber is modeled as a mass, spring and a viscous damper connected perpendicular to the elbow. With the help of Euler-Lagrange equations, the system’s model is developed, which is solved via MATLAB’s ode-15s suite. The tuning of the system is done via genetic algorithm and finally, The simulation results are presented which indicate a 87% and 80% decrease in the wrist and elbow’s steady-state amplitude by using the absorb-er.