Higashi Kosuke, Okamoto Shogo, Yamada Yoji, Nagano Hikaru, Konyo Masashi
Department of Mechanical Systems Engineering, Nagoya University, Nagoya, Japan.
Graduate School of Information Sciences, Tohoku University, Sendai, Japan.
Front Psychol. 2019 Jan 4;9:2654. doi: 10.3389/fpsyg.2018.02654. eCollection 2018.
A human can judge the hardness of an object based on the damped natural vibration caused by tapping the surface of the object using a fingertip. In this study, we investigated the influence of the dynamic characteristics of vibrations on the hardness perceived by tapping. Subjectively reported hardness values were related to the dynamic stiffness of several objects. The dynamic stiffness, which characterizes the impulsive response of an object, was acquired across the 40-1,000 Hz frequency range for cuboids of 14 types of materials by administering a hammering test. We performed two psychophysical experiments-a ranking task and a magnitude-estimation tasks-wherein participants rated the perceived hardness of each block by tapping it with a finger. We found that the perceptual effect of dynamic stiffness depends on the frequency. Its effect displayed a peak around 300 Hz and decreased or disappeared at higher frequencies, at which human perceptual capabilities are limited. The acquired results help design hardness experienced by products.
人类可以根据用指尖轻敲物体表面所引起的阻尼自然振动来判断物体的硬度。在本研究中，我们调查了振动的动态特性对轻敲时所感知硬度的影响。主观报告的硬度值与几个物体的动态刚度有关。通过进行锤击试验，在40 - 1000 Hz频率范围内获取了14种材料长方体的动态刚度，该动态刚度表征了物体的脉冲响应。我们进行了两项心理物理学实验——排序任务和量级估计任务，参与者通过用手指轻敲每个方块来评定所感知的硬度。我们发现动态刚度的感知效果取决于频率。其效果在300 Hz左右呈现峰值，在较高频率时降低或消失，而在较高频率时人类的感知能力有限。所获得的结果有助于设计产品所体验到的硬度。
