scholarly journals HARVEST: High-Resolution Haptic Vest and Fingertip Sensing Glove That Transfers Tactile Sensation of Fingers to the Back

2021 ◽  
Vol 11 (3) ◽  
pp. 1298
Author(s):  
Taha Moriyama ◽  
Hiroyuki Kajimoto
Keyword(s):  
High Resolution ◽  
Pressure Distribution ◽  
Tactile Sensation ◽  
Tactile Information ◽  
Tactile Receptors ◽  
Finger Skin

Human fingertips are densely populated with tactile receptors and are hence incredibly sensitive. However, wearing gloves on the fingers drastically reduces the tactile information available to the fingertips, such as the texture and shape of the object, and makes it difficult to perform dexterous work. As a solution, in this study, we developed a high-resolution haptic vest that transfers the tactile sensation of the fingertips to the back. The haptic vest contains 80 voice-coil type vibrators which are located at each of the two discrimination thresholds on the back and can be driven independently. The tactile sensation of the fingertips is transferred to the back using the developed haptic vest in combination with a sensing glove that can detect the pressure distribution on the finger skin at up to 100 points. Different experiments were conducted to validate the performance of the proposed haptic vest and sensing gloves. The use of the haptic vest and the sensing glove enabled the user to perceive the shape of a planar object more accurately when compared to the case where the user wore only the glove.

High-resolution electroluminescent imaging of pressure distribution using a piezoelectric nanowire LED array

2013 ◽  
Vol 7 (9) ◽  
pp. 752-758 ◽  
Author(s):  
Caofeng Pan ◽  
Lin Dong ◽  
Guang Zhu ◽  
Simiao Niu ◽  
Ruomeng Yu ◽  
...  
Keyword(s):  
High Resolution ◽  
Pressure Distribution ◽  
Led Array

Review and Perspective: Sensory Feedback in Upper Limb Prosthesis

2013 ◽  
Vol 303-306 ◽  
pp. 261-265
Author(s):  
Peng Zhang ◽  
Qi Xu ◽  
Ji Ping He
Keyword(s):  
Upper Limb ◽  
Sensory Feedback ◽  
Sensory Function ◽  
Tactile Sensation ◽  
Tactile Receptors ◽  
Upper Limb Prosthesis ◽  
Human Upper Limb ◽  
Limb Prosthesis ◽  
Sensory Functions

An emerging challenge in developing intelligent prostheses is to replicate or recreate the sensory functions of natural limbs for amputees. Such functions mainly include tactile sensation and proprioception. This paper reviews the tactile receptors and proprioceptors in human upper limb, the artificial sensors in upper limb prosthesis, and the sensory feedback technology used for reconstruction of lost sensory function in the amputee’s upper limb.

scholarly journals Development of MEMS Tactile Sensation Device for Haptic Robot

2020 ◽  
Vol 32 (2) ◽  
pp. 315-322 ◽  
Author(s):  
Junji Sone ◽  
Yasuyoshi Matsumoto ◽  
Yoji Yasuda ◽  
Shoichi Hasegawa ◽  
Katsumi Yamada ◽  
...  
Keyword(s):  
High Resolution ◽  
3D Printing ◽  
Electromechanical System ◽  
Tactile Sensation ◽  
Repulsion Force ◽  
Mems Technology ◽  
High Resolution Images ◽  
Prototype Device ◽  
Micro Electromechanical System ◽  
Haptic Sensation

A tactile sensation device using micro-electromechanical system (MEMS) has been developed. This device is integrated with a haptic sensation robot for use as fingers. The tactile device must be miniaturized to enable attachment of the actuator mechanism to the fingers. Therefore, we used MEMS technology for this device. The device is composed of an interface part fabricated by 3D printing, pins, and MEMS cantilever-type actuators. It has the ability to stimulate the mechanoreceptors of the fingertips. The device and robot can display not only high-resolution images of the fingertips but also the repulsion force during finger operations such as tool holding and rotation. We have not yet achieved the final device because of fabrication problems. In this paper, we explain the details, progress of development, and results of trials on the prototype device.

scholarly journals Evaluation of Electrovibration Stimulation with a Narrow Electrode

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 483 ◽  
Author(s):  
Hiroki Ishizuka ◽  
Seiya Komurasaki ◽  
Kunihiro Kato ◽  
Hiroyuki Kajimoto
Keyword(s):  
High Resolution ◽  
Use Cases ◽  
Tactile Sensation ◽  
Voltage Waveform ◽  
Low Frequencies ◽  
Tactile Displays

Recently, electrovibration tactile displays were studied and applied to several use cases by researchers. The high-resolution electrode for electrovibration stimulus will contribute to the presentation of a more realistic tactile sensation. However, the sizes of the electrodes that have been used thus far are of the millimeter-order. In this study, we evaluated whether a single narrow electrode was able to provide the electrovibration stimulus adequately. The widths of the prepared electrodes were 10, 20, 50, 100, 200, and 500 μm. We conducted a sensory experiment to characterize each electrode. The electrodes with widths of 50 μm or less were not durable or suitable for the applied signal, although the subjects perceived the stimulus. Therefore, we conducted the experiment without using these non-durable electrodes. The voltage waveform condition affected perception, and the subjects were not sensitive to the electrovibration stimulus at low frequencies. In addition, the stroke direction of the fingertip had a significant effect on perception under certain conditions. The results indicate that electrovibration stimulation requires an electrode with a width of only a few hundred micrometers for stimulation.

scholarly journals A MEMS Tactile Sensor with Fingerprint-Like Array of Contactors for High Resolution Visualization of Surface Distribution of Tactile Information

2020 ◽  
Vol 32 (2) ◽  
pp. 305-314
Author(s):  
Kazuki Watatani ◽  
◽  
Kyohei Terao ◽  
Fusao Shimokawa ◽  
Hidekuni Takao
Keyword(s):  
High Resolution ◽  
Frictional Force ◽  
Present Report ◽  
Tactile Sensor ◽  
Mechanical Analysis ◽  
Surface Shape ◽  
Woven Fabric ◽  
Surface Distribution ◽  
Tactile Information ◽  
Fabric Surface

In the present report, we have developed a tactile sensor with fingerprint-like array of contactors for obtaining the surface distribution of tactile information in high spatial resolutions. Six high resolution sensing modules of contactors with biaxial detectors were integrated in line at a pitch of 500 μm, the typical pitch of fingerprint ridges. Each sensing module independently detected the micro surface shape and locally generated frictional force on the object surfaces. Mechanical analysis of the fabricated sensors showed good sensitivities and highly linear responses. Consequently, the measured detection resolutions of surface shape and frictional force were 0.17 μm and 9.9 μN, respectively. The experimental performance evaluation of fabricated sensor was measured in the distribution of tactile information by sweeping the sensor with a yaw angle. Additionally, the 3D surface shape of weave structure and surface distribution of frictional force in a woven fabric with 0.4 mm pitch of threads in high spatial resolution was clearly visualized/observed. Moreover, the directionality of tactile information of the fabric surface distribution was successfully realized using the tactile sensor with the array of contactors by sweeping in different directions.

Method for Calculating Plastic Deformation of High Resolution and Large Contact Area

2021 ◽  
Vol 144 (1) ◽  
Author(s):  
S. Sklenak ◽  
D. Mevissen ◽  
J. Brimmers ◽  
C. Brecher
Keyword(s):  
Plastic Deformation ◽  
High Resolution ◽  
Pressure Distribution ◽  
Rough Surface ◽  
Tribological Properties ◽  
Contact Area ◽  
Three Dimensional ◽  
Rolling Contact ◽  
Contact Algorithm ◽  
Large Contact Area

Abstract In a rolling contact, the tribological properties in terms of friction, wear, and fatigue are significantly influenced by the surface roughness. Due to solid contact of the surfaces in the contact area, the roughness and thus also the tribological properties change during the service life of the contact. The initial load leads to major changes of the tribological properties figured out by Brecher et al. (2019, “Influence of the Metalworking Fluid on the Micropitting Wear of Gears,” Wear, 61(434–435), p. 202996). Prediction of the initial changes in topography in the contact area is necessary for specific optimization of rolling contacts. Especially for dry rolling–sliding contact, the roughness of the surfaces is crucial for the lifetime, which is part of the investigations within the DFG priority program 2074 (357505886). In this work, an elastic-plastic contact algorithm for calculating plastic deformation for dry contact of rough surfaces with large contact area and high resolution is presented. Due to the nonlinearity behavior associated with plastic deformation, the plastic contact algorithm is based on an iterative approach. An optimized meshing strategy is implemented to calculate the elastic pressure distribution on the surface. Corresponding to the two-dimensional pressure distribution, the three-dimensional stress distribution allows the consideration of residual stresses and interactions of the microscopic peaks of the rough surface. Furthermore, the three-dimensional plastic strain distribution allows the application of an analytical approach to represent the plastic deformation of the surface. Finally, the solution of a plastic contact calculation with an exemplary topography measured on a real rough surface is presented.

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