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Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
3.0K
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

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Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
401
Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

748
The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...
748
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

630
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
630
Electro-mechanical Systems01:19

Electro-mechanical Systems

1.6K
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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相关实验视频

Updated: Jan 18, 2026

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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基于委员会机器方法的可变频率下的压电歇斯底里模拟.

Francesco Aggogeri1, Nicola Pellegrini1

  • 1Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy.

Sensors (Basel, Switzerland)
|September 13, 2025
PubMed
概括
此摘要是机器生成的。

本研究引入了一种混合数据驱动模型,以准确预测和补偿压电执行器中的歇斯底里. 这种新的方法显著减少了建模错误,提高了控制系统的性能.

关键词:
在BoucWen.强烈的反弹反弹反弹.委员会机器机器委员会遗传算法是一种遗传算法.这是歇斯底里症.粒子群集优化 粒子群集优化

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Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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科学领域:

  • 机械电子和控制系统
  • 非线性动力学是一种非线性动力学.
  • 数据驱动建模数据驱动建模

背景情况:

  • 压电驱动器表现出复杂的hysteresis,具有挑战性的模型与时间变化的输入.
  • 现有的动态物理模型无法充分捕捉工业机械电子设备中的歇斯底里.
  • 精确的歇斯底里模拟对于精确的微定位和主动控制至关重要.

研究的目的:

  • 提出一种新的混合数据驱动模型,用于评估和补偿压电驱动器歇斯底里.
  • 整合Bouc-Wen和反射歇斯底里制剂,以增强非线性效应建模.
  • 在依赖时间的输入幅度和频率下提高压电执行器模型的准确性.

主要方法:

  • 开发了一种混合模型,结合了Bouc-Wen和反弹催化剂的配方.
  • 使用遗传算法 (GA) 和粒子群优化 (PSO) 进行参数识别.
  • 采用委员会机器方法,使用频率集群进行参数聚合.
  • 模拟并实验验证了压电驱动器的性能.

主要成果:

  • 使用委员会机器方法与完整模型相比,实现了23.54%的错误减少.
  • 与GA调整的Bouc-Wen子模型产生了0.42μm的根平均平方误差 (RMSE).
  • 最大绝对误差 (MAE) 在150-250Hz频域内约为0.86μm.

结论:

  • 拟议的混合数据驱动模型有效地评估和补偿压电执行器歇斯底里.
  • 委员会机器方法在减少建模错误方面提供了卓越的性能.
  • 精确的歇斯底里补偿可以提高压电执行器在控制应用中的精度.