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Related Concept Videos

Feedback control systems01:26

Feedback control systems

Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Rolling With Slipping01:14

Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
Kinetic Friction01:26

Kinetic Friction

Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car begins...
Effects of feedback01:24

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...
Rolling Without Slipping01:09

Rolling Without Slipping

People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is essential...

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Related Experiment Video

Updated: May 22, 2026

Measurement of Spatial Stability in Precision Grip
09:36

Measurement of Spatial Stability in Precision Grip

Published on: June 4, 2020

Slip speed feedback for grip force control.

D D Damian1, A H Arita, H Martinez

  • 1Department of Informatics, University ofZurich, Zurich, Switzerland. damian@ifi.uzh.ch

IEEE Transactions on Bio-Medical Engineering
|May 23, 2012
PubMed
Summary
This summary is machine-generated.

Engineered prosthetic hands can now provide enhanced slip feedback, relaying crucial information about slip occurrence and speed. This electrotactile stimulation shows promise for restoring stable grasp in prosthetic users.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Rehabilitation Technology

Background:

  • Human grasp stability relies on complex mechanoreceptor networks integrating mechanical cues.
  • Prosthetic interfaces present challenges for grasp stability due to perturbation risks.
  • Effective feedback is needed to address the slip phenomenon in prosthetic grasping.

Purpose of the Study:

  • To propose and evaluate an enhanced slip feedback modality for myoelectric prosthetics.
  • To relay information on slip occurrence and slip speed using electrotactile stimulation.
  • To compare the efficacy of this feedback with visual and binary slip detection.

Main Methods:

  • Development of an electrotactile stimulation system for slip feedback.
  • Psychophysical studies evaluating slip control in a simplified experimental setup.
  • Comparison of slip control efficiency against vision feedback and binary (on-off) feedback.

Main Results:

  • Electrotactile feedback conveying slip speed demonstrated comparable efficiency to visual feedback.
  • The proposed slip speed feedback significantly outperformed binary slip detection feedback.
  • Slip control efficiency was enhanced by the proposed tactile feedback modality.

Conclusions:

  • Electrotactile stimulation is a promising sensory method for prosthetic applications.
  • Enhanced slip feedback, particularly slip speed, can significantly improve grasp stability.
  • This technology offers potential for restoring naturalistic grasp control in prosthetic users.