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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

76
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
76
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

156
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
156
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

85
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
85
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

83
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
83
Linear time-invariant Systems01:23

Linear time-invariant Systems

211
A system is linear if it displays the characteristics of homogeneity and additivity, together termed the superposition property. This principle is fundamental in all linear systems. Linear time-invariant (LTI) systems include systems with linear elements and constant parameters.
The input-output behavior of an LTI system can be fully defined by its response to an impulsive excitation at its input. Once this impulse response is known, the system's reaction to any other input can be...
211
Properties of DTFT I01:24

Properties of DTFT I

356
In signal processing, Discrete-Time Fourier Transforms (DTFTs) play a critical role in analyzing discrete-time signals in the frequency domain. Various properties of the DTFTs such as linearity, time-shifting, frequency-shifting, time reversal, conjugation, and time scaling help understand and manipulate these signals for different applications.
The linearity property of DTFTs is fundamental. If two discrete-time signals are multiplied by constants a and b respectively, and then combined to...
356

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Using Neuron Spiking Activity to Trigger Closed-Loop Stimuli in Neurophysiological Experiments
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基于相变材料的真实时间延迟系统.

Rahuldas Kutteeri1, Martino De Carlo1, Francesco De Leonardis1

  • 1Photonics Research Group, Department of Electrical and Information Engineering, Politecnico di Bari, 70126 Bari, Italy.

Sensors (Basel, Switzerland)
|December 17, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种可调节的真实时间延迟 (TTD) 系统,用于微波阶段阵列天线 (MPAA). 它使用相变材料 (PCM) 与布拉格格 (BGs) 进行高效,低功耗的梁方向.

关键词:
布拉格格振器的使用方法微波光子学 微波光子学阶段变化的材料.真正的时间延迟

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科学领域:

  • 光子学和光学工程 光子学和光学工程
  • 材料科学 材料科学 材料科学
  • 天线技术天线技术

背景情况:

  • 微波分相阵列天线 (MPAA) 需要精确的光束方向.
  • 真正时间延迟 (TTD) 系统对于广角光束转向至关重要.
  • 现有的TTD系统可能很复杂,耗电.

研究的目的:

  • 开发一个紧的,低功耗的,不易挥发的,高度调节的TTD系统.
  • 将相变材料 (PCM) 与布拉格格 (BGs) 和相变布拉格格振器 (CPSBGRs) 集成.
  • 为了实现延迟线实现可编程开/关反射.

主要方法:

  • 通过利用PCM在BG/CPSBGR中的相位过渡来设计可编程开/关反射器.
  • 通过连接多个可编程反射器构建延迟线.
  • 通过结合多个延迟线来实现TTD系统.
  • 在1550nm和1550.6nm进行数值模拟和参数分析.

主要成果:

  • 通过使用PCM集成的BG/CPSBGR来证明可调节的TTD系统的可行性.
  • 展示了可编程开/关反射器功能,用于光束转向应用.
  • 通过数值模拟和参数分析验证系统性能.
  • 实现了紧和低功耗的TTD系统设计.

结论:

  • 将PCM与BG/CPSBGR集成,可以有效地创建可调节的TTD系统.
  • 这种方法为MPAA光束转向提供了一种高性能,不那么复杂的解决方案.
  • 拟议的系统是非挥发性和高度可调的,满足关键的设计目标.