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Hardness Perception Based on Dynamic Stiffness in Tapping.

Kosuke Higashi1, Shogo Okamoto1, Yoji Yamada1

  • 1Department of Mechanical Systems Engineering, Nagoya University, Nagoya, Japan.

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Summary
This summary is machine-generated.

Humans perceive object hardness through vibrations. This study links perceived hardness to dynamic stiffness, finding its perceptual impact peaks around 300 Hz, crucial for product design.

Keywords:
dynamic stiffnessfrequencyhardness perceptionprincipal component analysisvibration

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Area of Science:

  • Materials Science
  • Human Perception
  • Vibration Analysis

Background:

  • Human perception of object hardness relies on tactile feedback from fingertip tapping.
  • Vibrations generated during tapping provide cues about an object's physical properties, including hardness.

Purpose of the Study:

  • To investigate the relationship between the dynamic characteristics of vibrations and perceived hardness.
  • To determine how object dynamic stiffness influences subjective hardness ratings.

Main Methods:

  • Measured dynamic stiffness of 14 material types across 40-1,000 Hz using a hammering test.
  • Conducted psychophysical experiments involving ranking and magnitude estimation of perceived hardness via fingertip tapping.

Main Results:

  • Perceived hardness correlated with object dynamic stiffness.
  • The perceptual effect of dynamic stiffness varied with frequency, peaking around 300 Hz.
  • Perceptual sensitivity to dynamic stiffness diminished at higher frequencies (>300 Hz).

Conclusions:

  • Dynamic stiffness is a key factor in tactile hardness perception.
  • Human tactile perception of hardness is frequency-dependent, with optimal sensitivity around 300 Hz.
  • Findings inform the design of products with specific perceived hardness characteristics.