Vibration and shock loadings can lead to an operating mode violation of the electronic equipment, Printed Circuit Board (PCB) and electronic components failure. A major difficulty with PCB vibration response prediction is caused by influence of electronic components, as the components effectively increase the mass and stiffness of the PCB. The problem can be solved by using simplified method based on addition the mass and stiffness of the components to the PCB model. This work developed a methodology of PCB vibration analysis using simplified finite element models.
In this work, we design a wearable system providing control of elbow extension in hemiparetic individuals suffering from the post-stroke effects by stimulation of the triceps brachii muscle. Proposed system uses low-cost consumer grade MEMS accelerometer attached to the individual's forearm and measuring the tilt angle of the forearm relative to the gravity vector. Flexing the elbow above a predetermined threshold flexion angle triggers the triceps electrical stimulation. Among other things, the system is capable to transmit inertial data to external devices via Bluetooth. The operability of the system has been validated with healthy individuals and the results showed its potential as a tool for upper extremity rehabilitation after stroke.
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