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The User’s Role in Haptic System Design

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Engineering Haptic Devices

Part of the book series: Springer Series on Touch and Haptic Systems ((SSTHS))

Abstract

A good mechanical design has to consider the user in his or her mechanical properties. The first part of this chapter deals with the discussion of the user as a mechanical load on the haptic device. The corresponding model is split into two independent elements depending on the frequency range of the oscillation. Methods and measurement setups for the derivation of mechanical impedance of the user are reviewed, and a thorough analysis of impedance for different grip configurations is presented. In the second part of the chapter, the user is considered as the ultimate measure of quality for a haptic system. The relation of psychophysical parameters like the absolute threshold or the JND to engineering quality measures like resolution, errors, and reproducibility is described and application depending quality measures like haptic transparency are introduced.

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Notes

  1. 1.

    8 Hz corresponds to a typing speed of 480 keystrokes per minute. Four hundred keystrokes are regarded as very good for a professional typist, 300–200 keystrokes are good, and 100 keystrokes can be achieved by most laymen.

  2. 2.

    \(K\), a variable chosen completely arbitrarily, is a helpful construct for understanding block diagrams rather than having a real neurological analogy.

  3. 3.

    Thumb: 4 DoF, index finger: 3 DoF, middle finger: 2 DoF (sometimes 3 DoF), ring finger: 2 DoF, small finger: 2 DoF, wrist: 2 DoF. The rotation of the whole hand happens in the forearm and therefore does not count among the degrees of freedom of the hand itself.

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Authors and Affiliations

  1. Continental Automotive GmbH, VDO-Straße 1, 64832, Babenhausen, Germany

    Thorsten A. Kern

  2. Institute of Electromechanical Design, Technische Universität Darmstadt, Merckstr. 25, 64283, Darmstadt, Germany

    Christian Hatzfeld

Authors
  1. Thorsten A. Kern
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  2. Christian Hatzfeld
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Correspondence to Thorsten A. Kern .

Editor information

Editors and Affiliations

  1. Institut für Elektromechanische Konstruk, Technische Universität Darmstadt, Darmstadt, Germany

    Christian Hatzfeld

  2. Alsbach, Germany

    Thorsten A. Kern

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Kern, T.A., Hatzfeld, C. (2014). The User’s Role in Haptic System Design. In: Hatzfeld, C., Kern, T. (eds) Engineering Haptic Devices. Springer Series on Touch and Haptic Systems. Springer, London. https://doi.org/10.1007/978-1-4471-6518-7_3

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  • DOI: https://doi.org/10.1007/978-1-4471-6518-7_3

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  • Publisher Name: Springer, London

  • Print ISBN: 978-1-4471-6517-0

  • Online ISBN: 978-1-4471-6518-7

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