系统误差

The principle analysis of error and undesired signal has been done at great length, and relevant way to solve it has been adopted in the paper, too.

同时本文对电路系统中存在的干扰信号及引入的误差作了细致的理论分析，并采取了相关的办法进行解决。

On the basis of analysis on the dynamic frequency after power vacancy,the reason of unideal function of traditional device are dissected: it is set by using assumed load and power vacancy.The changed range of real load power and real power vacancy lead to big error.

在对电力系统出现功率缺额后的动态频率特性进行分析的基础上，剖析了传统低频减载装置动作效果不理想的原因：用假定的负荷和假定的功率缺额整定，由于实际负荷功率和实际的功率缺额变化幅度很大，而造成很大的误差。

Signal errors in the closed-loop path following system are proved to be uniformly ultimately bounded in a small neighborhood of zero.

Lyapunov稳定性分析证明了船舶路径跟踪闭环系统的所有误差信号一致最终有界。

By theoretical analysis, the closed-loop control system is proved to be semi-global uniformly ultimately bounded, and the output tracking error converges to a neighborhood of zero.

通过理论分析，证明了闭环控制系统半全局一致终结有界，跟踪误差收敛到零的一个邻域内。

The unit is a band-pass filter or a high-pass filters. It can eliminate dynamic measurement errors, but cause severe noise amplification.

其本质是一个带通或高通滤波器，在补偿测量误差的同时，会引入严重的高频噪声干扰，影响测量系统的精度。

By use of the microactuator with antipiezoelectric effect, an error compensation execution unit with ideal characterastic is designed.

进一步研制了集阻抗匹配，相位特性校正等功能于一体的高压驱动放大器，构成了误差补偿执行系统。

There is very little information for general cell diagnosis, which is universal problem in aluminum reduction process. Studies on technique of getting and processing cell state parameters have been made, where direct detection, on-line emulation and fuzzy information processing are combined. Then a new method of dynamic temperature detection, it's model and formula are proposed, and a practical equipment was designed. 3. Information about aluminum reduction process state are very different, not enough and unprecise, while there are many knowledge based on experience.

2为解决目前铝电解过程控制系统中普遍存在的、能用于槽况综合解析的信息不足这一问题，研究了综合运用直接检测技术、在线仿真技术和模糊信息处理技术等技术获取和处理电解槽的各种状态参数和信息的方法；并提出了一种新型的动态测温方法，推导了该方法的数学模型和计算公式，给出了公式的误差分析并设计了一个实验用动态测温装置，向实现对电解质温度的直接检测和控制迈出了探索性的一步。

Using MATLAB, the changes of frequency and power in every area of the two-area and three-area combined systems were simulated respectively and the result shows that the revised ACE controls the changes of frequency and power better than the unrevised one.

利用MATLAB分别对双区域和三区域联合系统中的每个区域中的频率变化和功率变化进行仿真，结果表明，采用修正后的区域控制误差控制下的频率变化和功率变化要比未修正的控制性能好。

For it, the variable gain ZPETC is presented to overcome modelled error and the influence of the parameters changes.

针对这一缺点，提出了变增益ZPETC，可以有效克服建模误差、系统参数变化等影响。

Aim To reduce the error of the valve controlled system with energy saving hydraulic pump, which is caused by variable gain characteristic.

目的减少由于节能液压源下的阀控系统变增益带来的跟踪误差。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。