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Related Concept Videos

Cable Subjected to Concentrated Loads01:28

Cable Subjected to Concentrated Loads

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Flexible cables are commonly used in various applications for support and load transmission. Consider a cable fixed at two points and subjected to multiple vertically concentrated loads. Determine the shape of the cable and the tension in each portion of the cable, given the horizontal distances between the loads and supports.
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Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

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The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
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Cable: Problem Solving01:29

Cable: Problem Solving

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When dealing with a cable that is fixed to two supports and subjected to uniform loading, it is crucial to determine the maximum tension in the cable. This process can be broken down into several key steps, as outlined below:
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Cable Subjected to Its Own Weight01:13

Cable Subjected to Its Own Weight

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Overhead power transmission lines rely on cables to carry electricity across large distances. To ensure the stability and functionality of these lines, it is crucial to understand the shape and tension experienced by the cables under the influence of their weight.
A generalized loading function is employed to analyze a cable subjected to its own weight. This function considers the force acting along the cable's arc length rather than its projected length, providing a more accurate...
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Bones of the Upper Limb: Ulna01:15

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The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side...
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Energy Stored In A Coaxial Cable01:31

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
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Robotic Mirror Therapy System for Functional Recovery of Hemiplegic Arms
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Upper limb exosuit cable routing optimization.

E Bardi, E Ambrosini, A Pirelli

    IEEE ... International Conference on Rehabilitation Robotics : [Proceedings]
    |September 30, 2022
    PubMed
    Summary
    This summary is machine-generated.

    Optimizing cable routing for upper limb exosuits can reduce power needs. A double cable design shows promise for lowering motor torque and energy consumption in elbow flexion assistance.

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    Area of Science:

    • Robotics
    • Biomechanics
    • Rehabilitation Engineering

    Background:

    • Exosuits offer promising assistance for daily living activities.
    • Portability is a critical design factor for wearable robotic devices.
    • Cable-driven upper limb exosuits require efficient cable routing for optimal performance.

    Purpose of the Study:

    • To determine the optimal cable routing configuration for an upper limb cable-driven exosuit assisting elbow flexion.
    • To minimize cable tension, thereby reducing power consumption and torque requirements.
    • To evaluate the impact of the optimal configuration on muscle activation and joint reaction forces.

    Main Methods:

    • Simulations were conducted using OpenSim to evaluate different cable configurations.
    • The optimal configuration was simulated under varying assistance levels.
    • Experimental testing on a benchtop setup assessed motor current and pronation/supination effects for three configurations.

    Main Results:

    • Simulation suggested a double cable configuration reduces motor torque and power consumption.
    • Experimental results confirmed a 12.5% reduction in motor current with the double cable setup compared to a single cable.
    • Simulations indicated reduced muscle activation with the optimal configuration, with minimal impact on joint reaction forces, though pronation/supination effects were noted.

    Conclusions:

    • A double cable configuration may enhance efficiency in upper limb exosuits by lowering torque and power demands.
    • While beneficial, the increased complexity and reduced efficiency of double cable systems mean single-cable solutions remain a viable option.
    • Further research may be needed to mitigate potential pronation/supination issues associated with optimized cable routing.