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相关概念视频

Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
426
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Electro-mechanical Systems01:19

Electro-mechanical Systems

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
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Mechanical Systems01:22

Mechanical Systems

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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
551
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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Design of Transmission Shafts01:16

Design of Transmission Shafts

717
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...
717

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Design and Implementation of a Bespoke Robotic Manipulator for Extra-corporeal Ultrasound
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基于形状记忆合金的步进驱动器用于手外骨架.

Alina Carabello, Marie Buschbeck, Andreas Erben

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    概括
    此摘要是机器生成的。

    本研究介绍了一种新的形状记忆合金 (SMA) 步进驱动器,用于手外骨,为耐力任务提供节能执行. 该机制使得手指在没有连续电源的情况下能够保持持久的位置,有助于康复.

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    科学领域:

    • 生物医学工程 生物医学工程
    • 机器人技术 机器人技术 机器人技术
    • 材料科学 材料科学 材料科学

    背景情况:

    • 手部外骨架对于康复至关重要,但目前的设计面临着尺寸,重量,舒适性和能源效率方面的挑战.
    • 现有的启动方法,如气动肌肉和电缆驱动系统有局限性,包括体积庞大的部件或持续任务的高能耗.
    • 智能材料,如形状记忆合金 (SMA),为紧的驱动提供了潜力,但在长时间使用时与能源需求作斗争.

    研究的目的:

    • 开发和分析手部外骨架的节能执行机制,特别是解决耐力任务的需求.
    • 提出一种基于形状记忆合金 (SMA) 的新型步进驱动器,作为现有执行解决方案的替代方案.
    • 评估该机制能够提供持续指部定位和支持精细运动技能的能力.

    主要方法:

    • 设计和实施使用两个SMA执行器的双向步进机制.
    • 分析机制在实现人工肌运动和保持位置方面的表现.
    • 测试机械的能力,以提升和降低一个100g质量.

    主要成果:

    • 基于SMA的步进驱动器成功地复制了人造肌的中风.
    • 该机制证明了在没有连续电源的情况下保持位置的能力,这对耐力至关重要.
    • 该设备被证明能够提升和降低100克的质量,这表明了辅助功能的潜力.

    结论:

    • 开发的SMA步进驱动器为手部外骨执行提供了一个有前途的,节能的解决方案,特别是在基于耐久性的任务中.
    • 这项创新可以通过支持缓慢的手指运动和训练患者的精细运动技能来增强康复.
    • 这些发现表明,走向更紧,更舒适,更有效的手部外骨架技术的可行途径.