Multimodal Haptic Device With Decoupled Softness Cue Rendering
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Solution Overview
Problem
Existing haptic display devices fail to realistically replicate the softness of a target object due to their inability to independently control cutaneous and kinesthetic tactile cues, leading to inaccuracies in softness perception.
Innovation Solution
A multimodal haptic device that decouples cutaneous and kinesthetic cues by using an actuator and a movable unit, controlled by a controller to adaptively render softness cues based on body part and target features, employing an inflatable-deflatable element and a pouch motor to provide independent tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing haptic display devices are used to replicate softness sensation, then the device structure is simple, but the softness perception accuracy deteriorates due to inability to independently control cutaneous and kinesthetic cues
Solution Approach 1:
The haptic display device is segmented into two independent functional modules: a first actuator for generating cutaneous tactile cues and a second actuator for generating kinesthetic tactile cues. This segmentation allows independent control of each cue type, improving softness perception accuracy while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
The device merges two distinct actuator systems (cutaneous and kinesthetic) into a unified haptic display platform that operates simultaneously. The controller integrates both actuation modes to deliver combined tactile feedback, achieving accurate softness replication through coordinated multi-modal stimulation.
2Reliability
If existing haptic devices use coupled control of contact area and force, then the device operation is simple, but the softness rendering realism deteriorates
Solution Approach 1:
The control system is segmented into independent control channels: one for regulating contact area (through the first actuator) and another for regulating force (through the second actuator). This independent control architecture enables realistic softness rendering by decoupling the two previously linked parameters, allowing precise manipulation of each cue separately.
Solution Approach 2:
The device dynamically changes multiple independent parameters (contact area, force magnitude, stimulation frequency) to accurately replicate softness characteristics. The controller adjusts these parameters based on target object properties, enabling realistic softness rendering through multi-parameter optimization rather than simple coupled control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides a more realistic and reliable perception of softness by accurately simulating cutaneous and kinesthetic cues, adapting in real-time to body part movements and target characteristics, thereby enhancing haptic technology and neuroscience research.
Implementation Method 1
an inflatable-deflatable element
Implementation Method 2
The actuator includes a contact region, intended to receive said force F by the body part, and at least one adaptive region, arranged at least in part around the contact region
Implementation Method 3
a support movable unit in operative connection with the actuator, to move the actuator in one direction of a force F applied by the body part to the actuator or in an opposite direction
Data Source
AI summary
A multimodal haptic device for rendering cutaneous and kinesthetic tactile cues of a target, including an actuator configured to contact a body part; a support movable unit, to move the actuator in one or an opposite direction of a force, the actuator including a contact region, configured to receive the force, and an adaptive region, around the contact region and substantially flat at rest; a controller configured to: set a first actuation input to raise the adaptive region relative to the contact region, wherein, in use, the haptic softness tactile cue is rendered by a surface of the raised adaptive region contacting the body part; drive the support movable unit to move the actuator in the one or opposite direction, the haptic kinesthetic tactile cue of the target rendered by another force applied to the body part by the actuator in the opposite direction.