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Related Concept Videos

Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Net Torque Calculations01:19

Net Torque Calculations

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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Torque Free Motion01:15

Torque Free Motion

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Virtual Work for a System of Connected Rigid Bodies01:06

Virtual Work for a System of Connected Rigid Bodies

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
Next,...
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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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Three-Dimensional Force System01:30

Three-Dimensional Force System

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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Related Experiment Video

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Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Torque Contribution to Haptic Rendering of Virtual Textures.

Sahba Aghajani Pedram, Roberta L Klatzky, Peter Berkelman

    IEEE Transactions on Haptics
    |March 14, 2017
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    Summary
    This summary is machine-generated.

    Torque feedback significantly enhances perceived roughness in virtual textures. Using a fingertip grasp with slope torque provides a more realistic rougher surface compared to force-only haptic systems.

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    Area of Science:

    • Haptic Perception
    • Human-Computer Interaction
    • Virtual Reality

    Background:

    • Conventional haptic interfaces primarily use force feedback, neglecting torques.
    • Real-world interactions, like writing, involve both forces and torques.
    • Torque feedback's role in texture perception remains underexplored.

    Purpose of the Study:

    • Investigate the impact of torque feedback on human roughness perception.
    • Compare different torque conditions and grasp types.
    • Evaluate a novel haptic platform for torque rendering.

    Main Methods:

    • Developed a novel haptic platform with fingertip and penhandle probes.
    • Implemented three torque conditions: Slope Torque, No Torque, and Stiff Torque.
    • Conducted a magnitude estimation experiment to quantify perceived roughness.

    Main Results:

    • Both torque signals and grasp type influence perceived texture roughness.
    • Slope Torque condition increased perceived roughness with a fingertip grasp.
    • Fingertip grasp yielded higher roughness ratings than penhandle under Slope Torque.

    Conclusions:

    • Torque feedback is crucial for realistic virtual texture perception.
    • The Slope Torque algorithm enhances perceived roughness, outperforming force-only methods.
    • Haptic systems incorporating torque feedback offer advantages for simulating rough surfaces.