The User’s Role in Haptic System Design

Abstract

Consequently, 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. The User as Mechanical LoadFady Youssef and Thorsten A. Kern Mapping of Frequency Ranges onto the User's Mechanical ModelThe area of active haptic interaction-movements, made in a conscious and controlled way by the user-is of limited range. Sources concerning the dynamics of human movements differ as outlined in the preceding chapters. The fastest conscious Christian Hatzfeld deceased before the publication of this book.

Feel-Good Requirements: Neurophysiological and Psychological Design Criteria of Affective Touch for (Assistive) Robots

“…Since haptic devices can be based on tactile stimulation, tactile sensing, or a combination of both principles as in telemanipulation, resolution of both actuators and sensors is expected to match physiological features of humans. While actuators should be as accurate as human perception can resolve, sensors should be as sensitive as human skin so that bidirectional haptic information can be transmitted (Kern and Hatzfeld, 2014). While resolution requirements apply to any haptic system, they strongly depend on the location of stimulation on the human body and, thus, vary with the respective mechanoreceptor population, skin properties, and spatial acuity (Dahiya et al, 2010).…”

“…From the detailed requirement analysis provided above, design specifications can be inferred to select and dimension components, e.g., actuators and sensors to meet the neurophysiological and psychological requirements. Besides the stimulation parameters mentioned there, a design should also align the haptic resolution of actuators and sensors with the physiological features of human sense of touch (Kern and Hatzfeld, 2014 ). Since haptic devices can be based on tactile stimulation, tactile sensing, or a combination of both principles as in telemanipulation, resolution of both actuators and sensors is expected to match physiological features of humans.…”

“…Since haptic devices can be based on tactile stimulation, tactile sensing, or a combination of both principles as in telemanipulation, resolution of both actuators and sensors is expected to match physiological features of humans. While actuators should be as accurate as human perception can resolve, sensors should be as sensitive as human skin so that bidirectional haptic information can be transmitted (Kern and Hatzfeld, 2014 ).…”

Human Perception Measures for Product Design and Development—A Tutorial to Measurement Methods and Analysis

“…The properties of human perception are a crucial design constraint for every technical system intended for human-machine interaction [1]. Depending on the application, the perceptual properties determine whether a technical system properly serves its purpose in terms of a defined information transfer and the tolerable level of nuisance and unwanted effects.…”