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Related Concept Videos

Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

543
Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
543
Design of Transmission Shafts01:16

Design of Transmission Shafts

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The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
817

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Related Experiment Video

Updated: Feb 26, 2026

A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
06:58

A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study

Published on: November 6, 2015

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Evaluating Variable Transmissions in Body-Powered Prosthetic Grasping.

Michael E Abbott, Andrew I W McPherson, Franklin D-K Ho

    IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
    |February 24, 2026
    PubMed
    Summary
    This summary is machine-generated.

    Variable transmissions in body-powered upper limb prostheses reduce user effort and improve grasping. However, abrupt changes in transmission can lead to overgrasping and damage to fragile objects.

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    Area of Science:

    • Biomedical Engineering
    • Rehabilitation Engineering
    • Human-Computer Interaction

    Background:

    • Body-powered upper limb prostheses offer haptic feedback but suffer from low adoption due to high user forces and discomfort.
    • Previous research on haptics testbeds suggests variable transmissions can mitigate these issues in simulated devices.

    Purpose of the Study:

    • To evaluate the effectiveness of different transmission modes, including variable transmissions, on a wearable body-powered prosthetic device.
    • To assess the impact of these transmissions on user actuation loads, motion inputs, and grasp success in real-world tasks.

    Main Methods:

    • Five transmission modes (fixed and variable) were tested on a body-powered wearable prosthetic device.
    • Participants performed grasp and lift tasks with various objects.
    • Actuation loads, motion inputs, and grasp success were measured for each transmission mode.

    Main Results:

    • Variable transmissions significantly reduced actuation loads required from the user.
    • Minimal changes were observed in the motion inputs needed to operate the device.
    • Abrupt, autonomous changes in transmission state increased the risk of overgrasping and damaging fragile objects.

    Conclusions:

    • Variable transmissions show promise for reducing physical demands in body-powered prostheses.
    • Careful control of transmission state is crucial to prevent overgrasping and ensure safe interaction with delicate objects.