Paper 6: Design of an Artificial Elbow: An Electromechanical Solution

This paper presents an outline of the power and energy requirements of a human elbow and gives a discussion on the means by which these requirements can be met. Reasons are given for the choice of a system using batteries for energy storage and direct electric drive by a motor and gearbox. The gearbox is of an unusual type, using ‘harmonic drive’ elements, which permit the motor to be installed transversally at the elbow. The gear reduction unit is described in detail. The paper also discusses the problems inherent in controlling a motor with large stall current in such a way that most efficient use is made of the energy stored in the battery, and two control circuits are described which meet the requirements. </jats:p

Dynamic dictionary matching revisited

Over 40% of the nation’s bridges have been classified as structurally deficient or functionally obsolete, with the estimated cost of repairs running in the billions of dollars [1]. It would not be economically feasible to replace all of these structures. Therefore, quantitative assessment of bridge condition is needed to determine which structures need replacing and which are safe