控制与自动化 Engineering

7 个科学问题 · 工程技术 Engineering

本页目录

PID 控制器中积分项引入会带来什么副作用,工程上如何缓解?

What side effect does the integral term introduce in a PID controller, and how is it mitigated in practice?

积分项消除稳态误差,但在大偏差或执行器饱和时会持续累积,产生积分饱和(windup),导致超调与恢复缓慢。工程上常用抗积分饱和(clamping 或 back-calculation)限制积分累积。
The integral term removes steady-state error but, under large error or actuator saturation, keeps accumulating and causes integral windup, leading to overshoot and slow recovery. Practitioners use anti-windup (clamping or back-calculation) to limit integral buildup.
难度 专业 · 适合 高中(15-18) CC BY 4.0 · 已核验 · Verified 2026-11-02
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《现代控制工程》(绪方胜彦,电子工业出版社)

Ogata, Modern Control Engineering, Prentice Hall

#PID #积分饱和 #抗饱和

李雅普诺夫稳定性理论的核心思想是什么,第二法为何实用?

What is the core idea of Lyapunov stability theory, and why is the second method practical?

李雅普诺夫思想是不直接解微分方程,而构造一个随状态趋近平衡点而递减的能量型函数(正定且导数负定)来判定稳定。第二法只需验证函数性质,无需知道系统轨迹,特别适合非线性与时变系统。
Lyapunov's idea is to avoid solving differential equations and instead construct an energy-like function that decreases toward the equilibrium (positive definite with negative-definite derivative) to prove stability. The second method only checks the function's properties without knowing trajectories, suiting nonlinear and time-varying systems.
难度 专业 · 适合 高中(15-18) CC BY 4.0 · 已核验 · Verified 2026-11-02
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Khalil《非线性系统》(电子工业出版社)

Nonlinear Systems, Khalil

#李雅普诺夫 #稳定性 #能量函数

反馈控制相比开环控制最大的优点是什么?

What is the greatest advantage of feedback control over open-loop control?

反馈控制持续测量输出并据此修正输入,能抑制模型误差、外部扰动与参数漂移带来的影响,使被控量稳定在期望附近。开环则完全依赖模型准确,对扰动无能为力。
Feedback control continuously measures the output and corrects the input, rejecting model error, disturbance, and parameter drift to keep the variable near the setpoint. Open-loop control relies entirely on an accurate model and cannot handle disturbances.
难度 进阶 · 适合 大众 CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
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胡寿松 主编,《自动控制原理》第6版,科学出版社,2013

Hu Shousong ed., Principles of Automatic Control, 6th ed., Science Press, 2013

#反馈控制 #开环 #抗扰动

状态空间法相比传递函数法在控制设计中能处理哪些问题?

What problems can state-space methods handle that transfer-function methods cannot?

状态空间以内部状态描述系统,天然支持多输入多输出、时变与非线性系统,并能配置极点、设计最优控制与观测器。传递函数仅适用于线性时不变单变量系统,且会丢失不可观不可控的内部模态。
State space describes a system by internal states, naturally handling MIMO, time-varying, and nonlinear systems, enabling pole placement, optimal control, and observers. Transfer functions apply only to LTI SISO systems and lose unobservable/uncontrollable internal modes.
难度 进阶 · 适合 初中(12-15) CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source

胡寿松 主编,《自动控制原理》第6版,科学出版社,2013

Hu Shousong ed., Principles of Automatic Control, 6th ed., Science Press, 2013

#状态空间 #MIMO #极点配置

什么是闭环系统的带宽,它对控制性能意味着什么?

What is the bandwidth of a closed-loop system, and what does it imply for control performance?

带宽指系统能较好地跟踪或衰减输入的频率范围上限,通常取增益下降到低频值 -3 dB 处。带宽越宽,系统响应越快、能跟踪更高频指令,但也可能放大噪声与敏感于未建模动态。
Bandwidth is the upper frequency limit over which a closed-loop system tracks or attenuates input well, usually the -3 dB point. Wider bandwidth means faster response and higher-frequency tracking, but also more noise amplification and sensitivity to unmodeled dynamics.
难度 进阶 · 适合 初中(12-15) CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source

胡寿松 主编,《自动控制原理》第6版,科学出版社,2013

Hu Shousong ed., Principles of Automatic Control, 6th ed., Science Press, 2013

#带宽 #闭环 #频响

什么是系统的稳定性,劳斯判据用来判断什么?

What is system stability, and what does the Routh criterion judge?

稳定性指系统在扰动后能否回到平衡或跟踪期望,不发散。劳斯判据由特征多项式系数构造表格,无需求根即可判断闭环极点是否全在左半平面,从而判定线性系统稳定与否。
Stability means a system returns to equilibrium or tracks the setpoint after disturbance without diverging. The Routh criterion builds a table from characteristic polynomial coefficients to judge, without root-finding, whether all closed-loop poles lie in the left half-plane.
难度 进阶 · 适合 初中(12-15) CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source

胡寿松 主编,《自动控制原理》第6版,科学出版社,2013

Hu Shousong ed., Principles of Automatic Control, 6th ed., Science Press, 2013

#稳定性 #劳斯判据 #特征多项式

什么是前馈控制,它和反馈控制如何配合使用?

What is feedforward control, and how is it combined with feedback control?

前馈根据可测扰动或指令提前施加补偿,在偏差出现前抵消其影响,提速且减小波动。它常与反馈结合:前馈处理已知可测扰动,反馈消除残差与未建模误差。
Feedforward acts on measured disturbances or commands to compensate before an error appears, speeding response and reducing variation. It is often paired with feedback: feedforward handles known measurable disturbances, feedback removes residual and unmodeled errors.
难度 进阶 · 适合 大众 CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source

胡寿松 主编,《自动控制原理》第6版,科学出版社,2013

Hu Shousong ed., Principles of Automatic Control, 6th ed., Science Press, 2013

#前馈控制 #复合控制 #扰动补偿