干扰抑制

A mixed sensitivity H∞ control model is constructed and the band width of wind turbine speed control is designed according to the frequency characteristic of wind speed variation and noise of rotating speed sensor. The sensitivity function is decreased within this frequency band to restrain the wind torque perturbation to wind turbine rotating speed control.

通过构造基于复合灵敏度的H∞鲁棒控制模型，根据风速的波动频率范围和传感器的噪声频率范围设计了风车转速控制的带宽，并在此带宽内降低系统的灵敏度函数，来抑制风力转矩对风车转速控制的干扰。

To solve the exsisting problems in the realization of the LFM/CW radar, the thesis presents a technique for dynamically measuring the LFM/CW signals, which can accomplish the dynamic measurements of FM linearity, FM bandwidth and FM slop of the transmitted signals of LFM/CW radars. This technique creates an effective and accurate means of judging the performance of LFMCW radars. The linearity-correction techniques presented in the thesis successfully make the linearity of the transmitted signals of an actual LFM/CW radar reduce from approximately 25% to 0. 1%(or r. m. s linearity of 0.04%), better than the best results (0.22%) obtained by foreign researchers with complex linearization closed-loop in the same kind of LFM/CW radars, according to the published literatures during the last decade. In order to improve the capability of the real-time processing and range-cells management of LFM/CW radars, the principle of equivalent mixing by lacking-sampling process of band-pass real signals is proposed based on the well-proved improvedversion of sampling theorem of band-pass real signals. This principle is used to configure the range-segments processing of the beat signals of an actual LFM/CW radar. The techniques of system-background interference suppression and the beat signal's dynamic range suppression are proposed, and are realized in an actual LFM/CW radar to demonstrate their effectiveness.

针对线性调频连续波雷达实现中急待解决的技术问题，文中提出并验证了线性调频连续波信号的综合动态测试技术，可以完成对线性调频连续波雷达发射信号的扫频线性度、扫频带宽和扫频斜率的综合动态测试，为衡量实际线性调频连续波雷达的系统性能创立了精确有效的测试手段；文中建立的非实时闭环动态校正技术使一部实际的线性调频连续波雷达的发射信号（时带积3×10〓）的扫频线性度从25%改善为0.1%（方均根线性度0.04%），优于国外已公布的80年代同类雷达中采用复杂的实时闭环动态校正环路所获得的实际结果（0.22%）；为了改善线性调频连续波雷达的实时性和分辨单元数处理能力，文中发展完善了实带通信号的采样定理并给予了严格证明，并在此基础上提出了欠采样等效混频原理，将其应用于实际线性调频连续波雷达的距离分段处理中；针对线性调频连续波雷达中系统背景干扰和回波动态范围问题，创立了系统背景综合抑制技术和频域动态范围压缩技术，并将它应用于实孔线性调频连续波雷达系统中，显示出它们的有效性。

It adopts national leading vibration-proof techniques to effectively suppress vibration and undesired signal caused by pressure oscillation.

采用国内领先的智能抗震技术，有效的抑制了震动和压力波动造成的干扰信号

L It adopts national leading vibration-proof techniques to effectively suppress vibration and undesired signal caused by pressure oscillation.

l 采用国内领先的智能抗震技术，有效的抑制了震动和压力波动造成的干扰信号

With analysis on the control model, an improved automatic tuning method for arc-suppression coil is proposed, that is: adopting voltage feed forward control to restrain interfere of 50Hz displacement voltage, which can improve the characteristic of the injected signal significantly, make the injected signal without reference to unbalanced network and neutral displaced system. Another innovation is detecting the magnitude of neutral point signal-frequency voltage to judge the resonant state, which improves the sensitivity and accuracy of resonant judgement effectively.

基于对控制模型的分析，提出了一种新的注入变频信号的消弧线圈自动调谐方法：通过电压前馈校正控制的引入，有效抑制了50Hz工频电压对注入信号的干扰，使得注入信号不受电网不对称及中性点位移电压的影响；提出以中性点注入信号电压幅值最大做为新的谐振判据，有效提高了谐振状态判断的灵敏度和准确度。

Experimental results disclosed that the upper limit on the photon mass was 1.2×10-51g, and this figure, collected by Particle Data Group in 2004, has improved almost 20-fold compared with that of the static torsion balance experiment.

该数值不仅将国际上扭秤静态实验结果提高了约20倍，而且调制的实验方法还有效地克服了扭秤静态实验中实验结果对宇宙磁场矢势与地球自转轴之间夹角的依赖关系，并且极大地抑制了各种周日背景干扰的影响，提高实验的置信水平，该实验结果于2004年被国际粒子物理数据组收录。

This system with greater time-delay and time-changed parameter as well as interrupts is described in principle.

着重从控制原理上介绍了在工程中处理大纯时间滞后、参数变化和抑制干扰的一种实现方法。

In order to restrain shock excitation force,So it guarantees fz will not interfere with Δi and Δs in order to eliminate the origin of shock excitation force.

为了要抑制令人感到意外的刺激力量，因此它保证 fz 将不干扰Δ i 和Δ s 为了要除去震惊的起源刺激强迫。

Problems such as charge injection and clock feedthrough caused by turning off swithes are analyzed and solved in this design. The optimal switch sequence helps eliminate the nonlinearity caused by the charge injection; the addition of dummy switches to sensitive nodes caused by the clock feedthrough can greatly reduce the coupled charge; and the use of high PSRR folded cascode differential input stage can restrain the interference from the power supply. The circuit performance, therefore, has been greatly improved.

设计中分析并解决了因时钟信号引起的制约开关性能的因素：优化的开关时序消除了电荷注入引起的非线性；时钟馈通敏感节点增加虚拟开关抵消了耦合电荷；高PSRR共源共栅折叠式差分输入结构，有效地抑制了来自电源的干扰，改善了电路的性能。

Simulation results demonstrate that the proposed method is valid and the system has strong restraint ability against disturbance.

数值仿真结果表明，所设计的控制器使得闭环系统在椭圆不变集中的初始状态随机稳定，同时系统对干扰有很强的抑制能力。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。