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A tuned mass amplifier for enhanced haptic feedback

Injeti, Sai Sharan and Israr, Ali and Liu, Tianshu and Mengüç, Yiğit and Piazza, Daniele and Shin, Dongsuk D. (2021) A tuned mass amplifier for enhanced haptic feedback. Mechanics of Materials, 160 . Art. No. 103979. ISSN 0167-6636. doi:10.1016/j.mechmat.2021.103979.

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Vibro-tactile feedback is, by far the most common haptic interface in wearable or touchable devices. This feedback can be amplified by controlling the wave propagation characteristics in devices, by utilizing phenomena such as structural resonance. However, much of the work in vibro-tactile haptics has focused on amplifying local displacements in a structure by increasing local compliance. In this paper, we show that engineering the resonance mode shape of a structure with embedded localized mass amplifies the displacements without compromising on the stiffness or resonance frequency. The resulting structure, i.e., a tuned mass amplifier, produces higher tactile forces (7.7 times) compared to its counterpart without a mass, while maintaining a low frequency. We optimize the proposed design using a combination of a neural network and sensitivity analysis, and validate the results with experiments on 3-D printed structures. We also study the performance of the device on contact with a soft material, to evaluate the interaction with skin. Potential avenues for future work are also presented, including small form factor wearable haptic devices and remote haptics.

Item Type:Article
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Injeti, Sai Sharan0000-0003-1941-9752
Additional Information:© 2021 Elsevier. Received 26 April 2021, Revised 11 June 2021, Accepted 30 June 2021, Available online 9 July 2021. We thank Hamzeh Musleh Fahmawi and Joseph Aase for help with conducting the experiments. We also thank Dr. Maurizio Chiaramonte and Dr. Kevin Carlberg for useful discussions. Data availability. The data that support the findings of this study can be made available from the corresponding author upon reasonable request. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Subject Keywords:Vibration; Haptics; Optimal design; Deep learning; 3-D printing
Record Number:CaltechAUTHORS:20210908-171135330
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Official Citation:Sai Sharan Injeti, Ali Israr, Tianshu Liu, Yiğit Mengüç, Daniele Piazza, Dongsuk D. Shin, A tuned mass amplifier for enhanced haptic feedback, Mechanics of Materials, Volume 160, 2021, 103979, ISSN 0167-6636,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110778
Deposited By: George Porter
Deposited On:08 Sep 2021 19:09
Last Modified:08 Sep 2021 19:09

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