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Digitale Medien

Six degrees of freedom motion measurement with application to violin-bowing analysis (1987)

Chalko, T. J. ; Williams, C. E.

Springer

Experimental mechanics 27 (1987), S. 423-428

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ISSN: 1741-2765

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract A spatial six degrees of freedom mechanism has been developed in order to measure instantaneous relative spatial position and motion of two rigid bodies. Angular displacements of all joints of the mechanism were measured by a set of precise potentiometers and digitized as a function of time. Conversion to linear Cartesian and angular coordinates involved a computer algorithm based on the direct kinematics approach. Calibration was carried out for the assembled mechanism in a given workspace. Joint angles were calculated for a number of defined positions of the mechanism using the inverse-kinematics computer algorithm. Calculated angles were then compared with the corresponding sensor readings and the characteristic of each joint sensor was determined individually by the least-squares-fit method. Differentiation of the obtained position trajectories was performed to find linear and angular velocities as well as accelerations. Digital filtering was applied to eliminate the noise caused by the data-acquisition system as well as by the digital differentiation procedure. The device has been applied to measure the relative position of the violin bow with respect to the violin itself. This enabled bowing-mechanics and bowing-skills analysis. An example of data obtained is presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02330317

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