scholarly journals Fast and accurate collision detection for haptic interaction using a three degree-of-freedom force-feedback device

2000 ◽  
Vol 15 (1-3) ◽  
pp. 69-89 ◽  
Author(s):  
A. Gregory ◽  
M.C. Lin ◽  
S. Gottschalk ◽  
R. Taylor
Keyword(s):  
Collision Detection ◽  
Force Feedback ◽  
Degree Of Freedom ◽  
Haptic Interaction ◽  
Three Degree Of Freedom

Haptic Wrists: An Alternative Design Strategy Based on User Perception

2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Javier Martín ◽  
Joan Savall ◽  
Iñaki Díaz ◽  
Josune Hernantes ◽  
Diego Borro
Keyword(s):  
Collision Detection ◽  
Design Problem ◽  
Force Feedback ◽  
Mechanical Design ◽  
Design Strategy ◽  
User Perception ◽  
Satisfactory Solution ◽  
Alternative Design ◽  
Three Degree Of Freedom ◽  
Mechanical Design Problem

A new three degree-of-freedom (3DOF) torque feedback wrist is being developed to be added to an existing 3DOF force feedback haptic device. It is difficult to find a satisfactory solution to the mechanical design problem, mainly because of the required large rotational workspace and severe weight constraints. This work proposes an alternative design strategy based on user perception, which allows simplification of the mechanics. The proposed approach consists of substituting the last rotational DOF of the wrist with a pseudohaptic DOF. Thanks to specially designed visuotactile cues, the pseudohaptic DOF is integrated with the active DOF into the same device, being able to generate free motion and collision detection perception to the user. This approach provides for simpler kinematics, lightweight designs, lower inertias, and less friction, which are key advantages for the inclusion of torque feedback into force feedback devices.

scholarly journals A Cable-Driven Three-DOF Wrist Rehabilitation Exoskeleton With Improved Performance

2021 ◽  
Vol 15 ◽  
Author(s):  
Ke Shi ◽  
Aiguo Song ◽  
Ye Li ◽  
Huijun Li ◽  
Dapeng Chen ◽  
...  
Keyword(s):  
Force Feedback ◽  
Dc Motor ◽  
Degree Of Freedom ◽  
Compensation Mechanism ◽  
Training Algorithm ◽  
Cable Tension ◽  
Rehabilitation Training ◽  
Improved Performance ◽  
Three Degree Of Freedom ◽  
Passive Training

This paper developed a cable-driven three-degree-of-freedom (DOF) wrist rehabilitation exoskeleton actuated by the distributed active semi-active (DASA) system. Compared with the conventional cable-driven robots, the workspace of this robot is increased greatly by adding the rotating compensation mechanism and by optimizing the distribution of the cable attachment points. In the meanwhile, the efficiency of the cable tension is improved, and the parasitic force (the force acting on the joint along the limb) is reduced. Besides, in order to reduce the effects of compliant elements (e.g., cables or Bowden cables) between the actuators and output, and to improve the force bandwidth, we designed the DASA system composed of one geared DC motor and four magnetorheological (MR) clutches, which has low output inertia. A fast unbinding strategy is presented to ensure safety in abnormal conditions. A passive training algorithm and an assist-as-needed (AAN) algorithm were implemented to control the exoskeleton. Several experiments were conducted on both healthy and impaired subjects to test the performance and effectiveness of the proposed system for rehabilitation. The results show that the system can meet the needs of rehabilitation training for workspace and force-feedback, and provide efficient active and passive training.

Haptic Interaction Within a Planar Environment

2000 ◽  
Author(s):  
S. P. DiMaio ◽  
S. E. Salcudean ◽  
M. R. Sirouspour
Keyword(s):  
Collision Detection ◽  
Effective Means ◽  
Simulation Software ◽  
Environment Design ◽  
Simulation Environment ◽  
Haptic Interaction ◽  
Interface Control ◽  
Simulated Environments ◽  
Three Degree Of Freedom ◽  
Haptic Simulation

Abstract A haptic simulation environment to simulate planar three-degree-of-freedom motion has been developed by the authors. The system consists of a novel parallel manipulandum and associated control, collision detection and dynamic simulation software running on a QNX PC. This paper describes haptic interface control and outlines the control systems that have been designed for the haptic rendering of virtual environments. Virtual environment design and implementation are also discussed. Using the haptic simulation environment that has been developed, a four-channel teleoperation architecture is shown to be an effective means to display a variety of simulated environments and is compared with a popular impedance-based approach.

Interactive Haptic Refinement of a Five-Axis Finishing Cut

2008 ◽  
Vol 8 (4) ◽  
Author(s):  
Kun Chen ◽  
Kai Tang
Keyword(s):  
Collision Detection ◽  
Force Feedback ◽  
Haptic Guidance ◽  
Detection Scheme ◽  
Cutter Path ◽  
Cutter Orientation ◽  
Three Degree Of Freedom ◽  
Five Axis ◽  
Cutter Path Generation ◽  
Fast Collision

This paper describes the design of a haptic system that allows the interactive modification of cutter orientation during five-axis finishing cuts with the aim of improving the surface finish quality and collision avoidance strategies. The system supports two haptic models that provide three degree of freedom (DOF) force feedback and 6DOF posture sensing. Details of five key functions of the system are given: (1) a rendering conversion that uses 3DOF (instead of five) force feedback haptic representation, (2) an efficient force feedback design that allows accurate results to be obtained from the user’s manipulation, (3) a fast collision detection scheme that achieves real-time feedback, (4) use of active haptic guidance to assist cutter-path generation, and (5) a design that supports both ball-end and flat-end tools with partial optimization.

scholarly journals A Magnetorheological Fluids-Based Robot-Assisted Catheter/Guidewire Surgery System for Endovascular Catheterization

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 640
Author(s):  
Linshuai Zhang ◽  
Shuoxin Gu ◽  
Shuxiang Guo ◽  
Takashi Tamiya
Keyword(s):  
Collision Detection ◽  
Endovascular Procedures ◽  
Force Feedback ◽  
Force Measurement ◽  
Occupational Hazards ◽  
Robot Assisted ◽  
X Ray ◽  
Surgical Safety ◽  
Surgical Tool ◽  
Haptic Cues

A teleoperated robotic catheter operating system is a solution to avoid occupational hazards caused by repeated exposure radiation of the surgeon to X-ray during the endovascular procedures. However, inadequate force feedback and collision detection while teleoperating surgical tools elevate the risk of endovascular procedures. Moreover, surgeons cannot control the force of the catheter/guidewire within a proper range, and thus the risk of blood vessel damage will increase. In this paper, a magnetorheological fluid (MR)-based robot-assisted catheter/guidewire surgery system has been developed, which uses the surgeon’s natural manipulation skills acquired through experience and uses haptic cues to generate collision detection to ensure surgical safety. We present tests for the performance evaluation regarding the teleoperation, the force measurement, and the collision detection with haptic cues. Results show that the system can track the desired position of the surgical tool and detect the relevant force event at the catheter. In addition, this method can more readily enable surgeons to distinguish whether the proximal force exceeds or meets the safety threshold of blood vessels.

scholarly journals Development of a Compound Speckle Interferometer for Precision Three-Degree-of-Freedom Displacement Measurement

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1828
Author(s):  
Hung-Lin Hsieh ◽  
Bo-Yen Sun
Keyword(s):  
Speckle Interferometry ◽  
Degree Of Freedom ◽  
Heterodyne Interferometry ◽  
Beam Splitting ◽  
Speckle Interferometer ◽  
Real World Applications ◽  
Three Degree Of Freedom ◽  
Contact Displacement ◽  
Displacement Measurements ◽  
Measurement Capabilities

In this study, a compound speckle interferometer for measuring three-degree-of-freedom (3-DOF) displacement is proposed. The system, which combines heterodyne interferometry, speckle interferometry and beam splitting techniques, can perform precision 3-DOF displacement measurements, while still having the advantages of high resolution and a relatively simple configuration. The incorporation of speckle interferometry allows for non-contact displacement measurements by detecting the phase of the speckle interference pattern formed from the convergence of laser beams on the measured rough surface. Experiments were conducted to verify the measurement capabilities of the system, and the results show that the proposed system has excellent measurement capabilities suitable for future real-world applications.

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