时间常数

PLC结合微机控制在时间常数测量装置中的应用

The Application of PLC Combined Computer Control in Time Constant Measuring Device

本文提出了一种低频减负荷时间常数PID控制算法。

Then propose a PID control arithmetic to confirm time constant in low-frequency load shedding .

一种变时间常数■（DC）自动增益控制系统

An automatical gain control system with varying constant ■

目的用常规PID控制器对具有较大时间常数、大纯滞后特性的被控对象实现最优控制。

Aim To control long time-delay , large time parameter model using PID controller .

去极化的快和慢时间常数被加速，缺乏footinthedoor效应。

The fast and slow time constants of deactivation were accelerated , lack of " foot in the door " effect .

谱的发射，而在热电子环破裂之后，冷等离子体的衰减时间常数比热电子环的衰减时间常数大，这与X射线方法测量的结果是一致的。

The decay time constant is larger than that of hot electron ring . This is conformed with results measured by use X-ray detector .

细胞膜时间常数（RC）与兴奋性的变化无规律性联系。

The time constant ( RC ) of the cell membrane is not related to the changes of excitability .

单周控制三相PFC中积分时间常数的影响

The Effect of Integration Time Constant of One Cycle Controlled Three-Phase Power Factor Correction

用示波器测RLC电路暂态过程的时间常数

Measure the Time-constant in the RLC Electric Circuit transition Process with the Oscilloscope

RC时间常数越大，输出信号的消失和恢复时间就越长。

The bigger of RC time constant , the longer the time which output signal of processing circuit is disappear and becomes normal .

深掺杂Si材料的应用不但提高了微型流量传感器的灵敏度，也大幅度地降低了其时间常数。

The application of the deep impurity silicon material not only enhances the sensitivity of the micro flow sensor , but also reduces its time constant greatly .

研究了时间常数受非对称双值色噪声扰动的RC串联电路的随机共振现象。

The phenomenon of stochastic resonance in an RC series circuit , whose time constant is fluctuated by asymmetric dichotomous noise , is investigated .

基于MRAS的异步电机转子时间常数实时辨识

Real-time estimation of rotor time-constant for induction motor based on MRAS

基于MRAS同时估计感应电机转子转速和时间常数

MRAS-Based Simultaneous Estimation of Speed and Time Constant of Induction Motor

在AGC低通滤波器中具有平方律非线性元件的变时间常数自动增益控制系统

An automatic gain control system of varying time constant that has a square-law characteristic device in AGC low pass filter

提出了干式变压器热时间常数和允许过载时间的计算方法，给出了运用Excel的计算实例。

The method to calculate thermal time constant and allowable overload time of dry-type transformer is presented . The calculating example with Excel is given .

发现，神经细胞膜时间常数及膜电容于生长期达最大值，而在衰老期显著减小（P＜0.05，P＜0.01）。

It was found that the time constant and the membrane capacitance reached a top value in the growth period and then decreased significantly in the aging period ( P0 . 05 , P0 . 01 ) .

仿真结果表明：当被控对象存在较大纯滞后、时间常数特性时，采用本方法优化PID控制器参数可获得比较满意的调节效果。

The simulated result shows that the step-respond of PID controller parameters tuned by this method is satisfied when the controlled object contains a bigger time delay and large time constant characteristics .

在矢量控制算法中，转子励磁时间常数Tr和给定转子磁链ψr对异步电机的调速性能有着至关重要的影响。

Rotor time constant Tr and the rotor flux reference value ψ r have an important effect on the timing performance of asynchronous motor in vector control .

分析表明，水位调节模式下调节系统的稳定条件容易满足，稳定域很大，前池时间常数Tq大的更有利于调节系统稳定。

The results show that the water-level controlling system has wide stable domain and stable condition is easy satisfied and the domain is larger when the forebay time constant Tq is bigger .

在水轮机调节系统中，水流惯性时间常数Tw与发电机时间常数Ta的相对关系，是影响系统动态特性的重要因素。

The relative relation between time constant of water conduit T_w and time constant of rotation T , is an important factor to determine the dynamic characteristic of water turbine governing systems .

给出了滤波器时间常数的变论域模糊控制改进方法，由e指数伸缩因子导出工程上可实用的幂指数伸缩因子。

Offered a improve fuzzy control method of the variable universe expansion factor for the filter time constant , advanced the exponential expansion factor derived from the e index which can be useful for the works .

数值计算的结果表明，Q值（放电时率和扩散时间常数之比）对材料的放电容量有非常重要的影响。

It is demonstrated by mathematic calculation that the discharge capacity of insertion electrode depends on the value of Q ( defined as the ratio of discharge hour rate and diffusion time constant ) .

HCD中铀基态原子衰变时间常数和亚稳态原子寿命测量

Measurement of decay time constant of ground and metastable states of U atoms in a HCD lamp

对于传统的单频段PSS，只要调整超前滞后环节时间常数，就能够获得较宽的补偿频段，可以影响到更多的模式。

For the conventional single band PSS , a wider compensation band can be acquired by adjust time constants of the lead-lag stages , to affect more modes .

无极性电容C1和线性锥形电位器R2决定积分器IC1B的时间常数。

Nonpolarized capacitor C1 and potentiometer R2 , a linear taper , determine the time constant of integrator IC1B .

依据异步电机T－I型等值电路的向量图，提出了一种实时检测异步机转子时间常数T2的方法。

This paper proposes a novel method of detecting the rotor time constant T2 of a motor on line in terms of the vector diagram of T-I type equivalent .

本文在分析LR电路过渡过程的基础上，讨论了以特定激励源实现变压器绕组电阻零时间常数测量的方法。

On basis of LR circuit transition process analysis , the paper describes measuring method of zero time factor for transformer wire-wound resistor with specific exciting supply .

由于定义出串级调速下的机电时间常数B，因此得出与SCR直流拖动相似的形式。文章中的数学模型与物理概念完全吻合，异于常见的形式。

We have obtained the similar form between SCR DC drive and this system by defining a machine-electro time constant B.The mathematical modeling is fully agreeable to the physical concept , different from the forms we have often seen .

同时将穷举法和遗传算法同闭环仿真平台结合起来，进行了参数优化，本论文优化了PID控制中的比例系数和积分时间常数，取得了较好的效果。

And by combining exhaust algorithm and genetic algorithm with the closed-loop simulation system , parameter optimization can be implemented . In this paper , proportion coefficient and integral time constant of PID control are optimized and good performance is achieved .