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相关概念视频

Frames: Problem Solving I01:24

Frames: Problem Solving I

465
Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
465
Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

670
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.
670
Cable Subjected to Concentrated Loads01:28

Cable Subjected to Concentrated Loads

817
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.
817
Cable Subjected to Its Own Weight01:13

Cable Subjected to Its Own Weight

445
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...
445
Machines: Problem Solving II01:30

Machines: Problem Solving II

308
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
308
Cable: Problem Solving01:29

Cable: Problem Solving

325
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:
325

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适应式跟踪控制,用于具有可变电缆长度的未完善的双摆形头部起重机.

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    科学领域:

    • 控制工程 控制工程 控制工程
    • 机器人技术 机器人技术 机器人技术
    • 机械系统 机械系统

    背景情况:

    • 空头起重机控制文献广泛,但缺乏针对同时复杂因素的策略.
    • 挑战包括双效应,可变的电缆长度,输入和,死区和外部干扰.

    研究的目的:

    • 开发适应式跟踪控制,用于未经调节的头部起重机.
    • 同时解决多个具有挑战性的系统效应.
    • 提高过渡性能,确保顺利运行.

    主要方法:

    • 设计了一个由两个组件组成的控制器:一个跟踪信号向量和一个自适应规律.
    • 追踪信号向量减少了系统的摆动幅度.
    • 适应性法估计和补偿摩擦,干扰和非线性.

    主要成果:

    • 使用利亚普诺夫方法和巴巴拉特定理进行严格的稳定性证明.
    • 对于具有输入和和死区的系统,已证明有效.
    • 与现有方法相比,数值模拟验证了优越的性能和稳定性.

    结论:

    • 拟议的自适应跟踪控制器有效地处理复杂的空吊起重机动态.
    • 控制器在各种具有挑战性的条件下确保了系统的稳定性和强大的性能.
    • 这种方法为空头起重机控制应用提供了显著的改进.