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相关概念视频

Maximum Power Transfer01:16

Maximum Power Transfer

287
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
287
Complex Power01:14

Complex Power

460
Power engineers have introduced the concept of complex power to determine the cumulative effect of parallel loads. This idea plays a crucial role in power analysis because it encompasses all the details related to the power consumed by a specific load.
Complex power is defined as the multiplication of the voltage and the complex conjugate of the current. The magnitude of this power, known as apparent power, is measured in volt-amperes (VA). Notably, the angle of the complex power equates to the...
460
Power01:08

Power

11.5K
The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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Power Factor01:11

Power Factor

409
The power factor is defined as the ratio of average (or active) power to apparent power, as illustrated by the relation
409
Network Function of a Circuit01:25

Network Function of a Circuit

322
Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
322
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

138
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
138

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Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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运行功能值与关键功率:相同的概念但不同的价值.

Alberto A Ñancupil-Andrade1, Santiago A Ruiz-Alias2, Alejandro Pérez-Castilla3

  • 1Department of Health, Universidad de Los Lagos, Puerto Montt, Chile.

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|August 16, 2023
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20分钟的计时试验 (TT) 可以准确估计运动员的功能值功率 (FTP) 和临界功率 (CP). 将FTP的校正系数为90%,CP的校正系数为95%应用于20分钟的TT,可提供可靠的结果.

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科学领域:

  • 运动科学 运动科学 运动科学
  • 运动生理学 运动生理学
  • 业绩分析 业绩分析 业绩分析

背景情况:

  • 功能值功率 (FTP) 和临界功率 (CP) 是评估耐力性能的关键指标.
  • 准确确定FTP和CP对于有效的培训计划设计至关重要.
  • 对于运动员和教练来说,较短,可行的测试协议是可取的.

研究的目的:

  • 用较短的时间试验 (10,20,30分钟) 来估计FTP和CP.
  • 确定这些较短的时间试验在预测FTP和CP时的准确性.
  • 评估FTP和CP在功率持续时间曲线上的位置.

主要方法:

  • 15名训练有素的运动员完成了10次计时赛,时间从1分钟到60分钟.
  • FTP被定义为在60分钟的时间试验中平均输出功率.
  • 使用运行功率计估计CP,使用线性回归分析较短的时间试验数据.

主要成果:

  • 从10分钟,20分钟和30分钟的计时试验中获得了可接受的FTP估计值,校正因数分别为85%,90%和95%.
  • 只有在20分钟的时间试验中才能获得可接受的CP估计,使用95%的校正因数.
  • 发现临界功率大约比FTP高1W,比30分钟输出功率高14W.

结论:

  • 20分钟的计时试验是一种可行和可靠的方法来估计FTP和CP.
  • 运动员和实践者可以使用20分钟的计时赛,并使用特定的校正因数 (FTP为90%,CP为95%) 来进行实践评估.
  • 这些发现为耐力运动员的功率分析提供了一种节省时间的方法.