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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

676
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
676

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A Vibrotactile Feedback Device for Seated Balance Assessment and Training
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A Wearable Shoulder Skin-Deformation Device Generating Illusory Forces for Posture Correction.

Kohei Okuda, Takuto Nakamura, Hideaki Kuzuoka

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    A novel wearable haptic device uses shoulder skin-shear deformation to create strong, quantifiable illusory forces. This technology reliably modifies upper-body posture, paving the way for new assistive and rehabilitation systems.

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    Area of Science:

    • Biomechanics
    • Haptics
    • Wearable Technology

    Background:

    • The hanger reflex describes directional force sensations from skin shear, applicable to shoulder haptic guidance.
    • Previous research confirmed illusory forces from skin shear at the shoulder, but magnitude and postural effects were unquantified.

    Purpose of the Study:

    • To quantify the perceived force magnitude elicited by shoulder skin-shear deformation.
    • To evaluate the effects of these forces on upper-body posture for potential applications in posture correction.

    Main Methods:

    • A wearable haptic device with pneumatic airbags applied controlled skin-shear deformation to shoulders.
    • Experiment 1: Psychophysical comparison of skin-shear-elicited forces versus real traction forces.
    • Experiment 2: Measurement of trunk inclination changes under varying postures and stimulation directions.

    Main Results:

    • The device generated significantly larger perceived forces than typical illusion-based methods, with a linear pressure-force relationship.
    • Consistent posture adjustments were observed, particularly backward inclination, influenced by initial posture and stimulus intensity.

    Conclusions:

    • The shoulder hanger-reflex device provides quantifiable force sensations and induces measurable posture modification.
    • Findings support individualized calibration for wearable posture-support, rehabilitation, and ergonomic assistive systems.