Effects of Multi-Point Contacts during Object Contour Scanning Using a Biologically-Inspired Tactile Sensor

Area of Science:

• Robotics and Biomechanics
• Sensor Technology
• Mammalian Sensory Systems

Background:

• Vibrissae are crucial tactile organs for mammals, particularly rodents, aiding in object detection and feature recognition.
• Mechanical models of vibrissae are essential for developing advanced tactile sensors in engineering.
• Existing models often simplify contact to a single force, limiting their application in complex scanning scenarios.

Purpose of the Study:

• To investigate the effects of multi-point contacts on artificial vibrissae during scanning of concave object contours.
• To develop a theoretical and experimental framework for analyzing vibrissae mechanics under complex contact conditions.
• To enable reliable detection and filtering of multi-point contacts for accurate object shape reconstruction.

Main Methods:

• Modeling the artificial vibrissa as a clamped Euler-Bernoulli bending rod capable of large deflections.
• Theoretical calculation and experimental measurement of elasticae and support reactions during scanning.
• Utilizing a force/torque sensor to record experimental data for validation.

Main Results:

• Experimental results validate the quasi-static scanning displacement assumption and simulation findings.
• Demonstrated the ability to distinguish between tip and tangential contacts, including multi-point scenarios.
• Showcased the identification of different contact phases solely through support reaction analysis.

Conclusions:

• Multi-point contacts can be reliably detected and filtered using support reaction analysis, a novel contribution.
• This approach enhances the accuracy of object shape reconstruction by discarding erroneous contact points.
• The findings advance the development of sophisticated tactile sensors inspired by biological vibrissae.