scholarly journals Three-Axis Pneumatic Haptic Display for the Mechanical and Thermal Stimulation of a Human Finger Pad

Actuators ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 60
Author(s):  
Eun-Hyuk Lee ◽  
Sang-Hoon Kim ◽  
Kwang-Seok Yun
Keyword(s):  
Pulse Width Modulation ◽  
Haptic Feedback ◽  
Control Function ◽  
Lateral Displacement ◽  
Gain Control ◽  
Haptic Display ◽  
Positional Accuracy ◽  
Control Module ◽  
Haptic Displays ◽  
Human Finger

Haptic displays have been developed to provide operators with rich tactile information using simple structures. In this study, a three-axis tactile actuator capable of thermal display was developed to deliver tactile senses more realistically and intuitively. The proposed haptic display uses pneumatic pressure to provide shear and normal tactile pressure through an inflation of the balloons inherent in the device. The device provides a lateral displacement of ±1.5 mm for shear haptic feedback and a vertical inflation of the balloon of up to 3.7 mm for normal haptic feedback. It is designed to deliver thermal feedback to the operator through the attachment of a heater to the finger stage of the device, in addition to mechanical haptic feedback. A custom-designed control module is employed to generate appropriate haptic feedback by computing signals from sensors or control computers. This control module has a manual gain control function to compensate for the force exerted on the device by the user’s fingers. Experimental results showed that it could improve the positional accuracy and linearity of the device and minimize hysteresis phenomena. The temperature of the device could be controlled by a pulse-width modulation signal from room temperature to 90 °C. Psychophysical experiments show that cognitive accuracy is affected by gain, and temperature is not significantly affected.

Multi-Mode Haptic Display of Image Based on Force and Vibration Tactile Feedback Integration

2020 ◽  
pp. 2154017
Author(s):  
Lei Tian ◽  
Aiguo Song ◽  
Dapeng Chen
Keyword(s):  
Haptic Perception ◽  
Haptic Feedback ◽  
Three Dimensional ◽  
Tactile Feedback ◽  
Geometric Shape ◽  
Haptic Display ◽  
Device Structure ◽  
Sense Of Reality ◽  
Integrated Device ◽  
Multi Mode

In order to enhance the sense of reality haptic display based on image, it is widely expected to express various characteristics of the objects in the image using different kinds of haptic feedback. To this end, a multi-mode haptic display method of image was proposed in this paper, including the multi-feature extraction of image and the image expression with various types of haptic rendering. First, the device structure integrating force and vibrotactile feedbacks was designed for multi-mode haptic display. Meanwhile, the three-dimensional geometric shape, detail texture and outline of the object in the image were extracted by various image processing algorithms. Then, a rendering method for the object in the image was proposed based on the psychophysical experiments on the piezoelectric ceramic actuator. The 3D geometric shape, detail texture and outline of the object were rendered by force and vibration tactile feedbacks, respectively. Finally, these three features of the image were haptic expressed simultaneously by the integrated device. Haptic perception experiment results show that the multi-mode haptic display method can effectively improve the authenticity of haptic perception.

An Error Tolerant MMIC Based Phase/Gain Control Module for Beam Forming Networks

1992 ◽  
Author(s):  
L M Devlin ◽  
B J Buck ◽  
C G Eddison ◽  
D Leistner ◽  
G Braun
Keyword(s):  
Gain Control ◽  
Beam Forming ◽  
Control Module

Upper Limb Motion Profile During Small to Medium Time-Limited Reaching Tasks in a VR Based Robotic Training Environment

2007 ◽  
Author(s):  
Evagoras G. Xydas ◽  
Loucas S. Louca
Keyword(s):  
Virtual Environments ◽  
Virtual Environment ◽  
Upper Limb ◽  
Haptic Feedback ◽  
Control Function ◽  
Rehabilitation Robotics ◽  
Working Environment ◽  
Therapeutic Effects ◽  
Robotic Training ◽  
Minimum Jerk

In the area of rehabilitation robotics, many researchers have investigated the therapeutic effects of forces that are proportional to the difference of the user’s hand trajectory with an optimum trajectory that is usually based on the Minimum Jerk Model (MJM). Forces applied in different studies were based on MJM trajectory variables, e.g., velocity, acceleration, position, etc. Consequently, MJM is a key component for upper limb robotic rehabilitation. However, it is critical to establish the validity of this model in the working environment prior of employing it as a reference control function. This work investigates the validity of the MJM under a haptic-virtual environment. The original ‘real’ tests (with no obstacles) that were employed for validating the MJM in planar motion are duplicated in a virtual environment. Haptic feedback is achieved with the use of a Phantom 1.5 High Force haptic interface. Experiments with healthy users are performed to investigate the validity of the MJM in virtual reality conditions. The experiments demonstrated that the MJM is also valid in virtual environments. Nevertheless it was found that in the virtual world, higher time durations are required for completing the tasks than in the real world. The results of this work will be used in the design of haptic-virtual environments for the rehabilitation of upper limbs of people with neuro-disabilities. Therapeutic forces based on the MJM can be applied given that the Minimum Jerk Model is valid in virtual environments.

The Proactive Desk: A New Haptic Display System for a Digital Desk Using a 2-DOF Linear Induction Motor

2004 ◽  
Vol 13 (2) ◽  
pp. 146-163 ◽  
Author(s):  
Haruo Noma ◽  
Shunsuke Yoshida ◽  
Yasuyuki Yanagida ◽  
Nobuji Tetsutani
Keyword(s):  
Induction Motor ◽  
Haptic Feedback ◽  
Induction Motors ◽  
Physical Object ◽  
Haptic Display ◽  
Display System ◽  
Linear Induction ◽  
Linear Induction Motor ◽  
Physical Objects ◽  
First Time

The Proactive Desk is a new digital desk with haptic feedback. The concept of a digital desk was proposed by Wellner in 1991 for the first time. A typical digital desk enables a user to seamlessly handle both digital and physical objects on the desk with a common GUI standard. The user, however, handles them as virtual GUI objects. Our Proactive Desk allows the user to handle both digital and physical objects on a digital desk with a realistic feeling. In the Proactive Desk, two linear induction motors are equipped to generate an omnidirectional translational force on the user's hand or on a physical object on the desk without any mechanical links or wires, thereby preserving the advantages of the digital desk. In this article, we first discuss applications of a digital desk with haptic feedback; then we mention the design and structure of the first trial Proactive Desk, and its performance.

Low power up-conversion mixer with gain control function

2016 ◽  
Vol 70 (8) ◽  
pp. 1071-1075 ◽  
Author(s):  
Jhen-Ji Wang ◽  
Duan-Yu Chen ◽  
San-Fu Wang ◽  
Rong-Shan Wei ◽  
Ching-Yung Hsueh
Keyword(s):  
Low Power ◽  
Control Function ◽  
Gain Control

scholarly journals Dynamic Brake Control for a Wearable Impulsive Force Display by a String and a Brake System

2021 ◽  
Vol 33 (5) ◽  
pp. 1075-1081
Author(s):  
Satoshi Saga ◽  
◽  
Naoto Ikeda
Keyword(s):  
Virtual Reality ◽  
Quantitative Evaluation ◽  
Dynamic Control ◽  
Brake System ◽  
Impulsive Force ◽  
Haptic Display ◽  
Braking System ◽  
Haptic Displays ◽  
Reaction Forces

In recent years, it has become possible to experience sports in the virtual reality (VR) space. Although many haptic displays in the VR environment currently use vibrators as the mainstream, the vibrators’ presentation is not suitable to express ball-receiving in the VR sports experience. Therefore, we have developed a novel haptic display that reproduces an impulsive force by instantaneously applying traction to the palm using a string and wearable brake system. This paper proposes a method to present various reaction forces by dynamic control of the braking system and report the quantitative evaluation of the device’s physical and psychological usability.

Excalibur, a Three-Axis Force Display

1999 ◽  
Author(s):  
Richard J. Adams ◽  
Manuel R. Moreyra ◽  
Blake Hannaford
Keyword(s):  
Force Feedback ◽  
Digital Simulation ◽  
Haptic Display ◽  
Haptic Displays ◽  
Interface Modeling ◽  
Modal Behavior ◽  
And Performance ◽  
The Stability ◽  
Representative Points ◽  
Haptic Simulation

Abstract In haptic simulation, a force feedback device is combined with a digital representation of a virtual world to create a kinesthetically immersive experience. The force feedback device, or haptic display, is usually a robotic manipulator with which a human operator interacts physically through a handle, stylus, finger-pad or some other form of customized interface. Modeling of the haptic display is often overlooked when building a haptic simulation. Understanding the dynamic behavior of the device is critical in assessing the stability and performance of the overall system as well as in the construction of the digital simulation. This paper describes some of the special modeling requirements for haptic displays. A dynamic model for Excalibur, a new three axis force display, is developed in a two step process. First an analytical model is constructed based on measured values and basic principals. Then the model is tuned using the results of vibrational testing to achieve a close match between the modal behavior of the theoretical and real systems. Numerical and experimental results are presented for representative points in the device’s workspace.

Influence of Age and Gender on the Reaction Performance in Human-Vehicle InteractionEinfluss von Alter und Geschlecht auf die Reaktionszeit bei Fahrer-Autor Interaktion

i-com ◽  
2009 ◽  
Vol 8 (2) ◽  
pp. 34-39
Author(s):  
Andreas Riener
Keyword(s):  
Haptic Feedback ◽  
Empirical Studies ◽  
Reaction Times ◽  
Vehicle Control ◽  
Haptic Display ◽  
Age And Gender ◽  
Car Seat ◽  
Reaction Performance ◽  
The Common ◽  
And Gender

AbstractExcess workload in vehicle control and inappropriateness of the common two interaction modalities seeing and hearing requires to consider ways and means for new interaction capabilities in vehicles. We have investigated haptic force displays for transmitting feedback from vehicular services to the driving person by using vibro-tactile elements integrated into the car seat and backrest. A haptic display would be implicit perceivable and passive in its attentiveness, and would furthermore display only private messages. Empirical studies regarding reaction times for the different modalities vision, sound, and touch, as well as age- and genderdependent evaluations have been conducted, with the aim to identify general conditions for an all-purpose vehicle interaction system and to justify the usage of haptic feedback. Experimental data have been acquired in a simulated driving environment in order to guarantee safety for test persons, repeatability of the experiment itself, and similar conditions for each test run.

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