抑制器

Periodic fluid pulsation in aeroplane hydraulic piping could induce fluid-construction vibration and lead to fatigue damage. It is impossible to find the error sensor's optimization location because of the pressure standing wave, and the pulsation attenuation effect is not perfect when adopting pulsation attenuation at single point. For this reason, a distributed active control method of fluid pulsation was presented. To avoid stationary point in all aviation states, several fluid pulsation actuators and error pressure sensors were placed along the piping. The second fluid pulsation produced by actuators can counteract the primary pulsation brought by aviation piston pump and make the mean pulsation of whole piping minimum when adopting adaptive feed- forward control and the filtered-X least mean square algorithm.

针对飞机液压能源管路系统中的周期性流体脉动诱发流固耦合振动，导致管路疲劳损伤的问题，针对管路中存在压力驻波特性，在采用单点消振时寻找误差传感器最佳布局位置困难而引起脉动抑制效果不理想的缺点，提出了一种分布式流体脉动主动控制方法，即沿管路不同位置布置多个主动消振阀和误差压力传感器，在任意飞行阶段，避开压力驻波点，以误差压力传感器的脉动测量值为控制目标，采用一种针对周期脉动主动控制的自适应前馈控制法和多通道自适应滤波－X LMS算法，调整控制器参数，使主动消振器产生的次级脉动与管路中的初始脉动相互抵消，达到整个管路中的平均流体脉动最小的效果。

One of the most important measures that are used to make TWT work stably and reliably is to suppress all kinds of self-oscillations, including BWO. On the basis of the coupled mode theory, considering the effects of attenuator/sever, taper/step phase velocity, voltage gradient of electron beam, etc.

本论文基于耦合模理论，全面地考虑了衰减器/切断、相速渐变/跳变和电子注的电位梯度等的影响，建立了抑制返波振荡的统一的自洽线性工作方程组，包括线路方程、运动方程和电流连续性方程，并给出了相应的边界条件。

Its working principle is introduced here: when a gas or powder starts a flame or explosion, the ultraviolet sensor will acquire the signal and sent it to the controller to produce the trigger voltage, and then the explosive suppressor will release a great number of gas promptly spraying dry powder extinguishing agents, which thereby form extinguishing agent smoke and effectively extinguish explosion flame. It is rapid and of strong antiinterference ability, high reliability and can be fixed easily. It is capable of effectively suppressing natural gas explosion in the simulative gas explosion test. It can be applied in CNG stations or other site where has explosive and combustible gas whereby to enhance the overall accident control ability.

当发生气体燃烧、爆炸时，紫外传感器接收火焰信号，传送至控制器，控制器产生触发电压，使抑爆器的产气剂释放出大量气体，驱动快速喷撒出干粉灭火剂，形成足够浓度的灭火剂粉雾体，有效扑灭爆炸火焰，具有动作速度快、抗干扰能力强、可靠性高、安装使用方便等优点，在天然气模拟爆炸试验中能有效抑制天然气爆炸，可用于CNG加气站或其他燃烧爆炸性气体场所，提高其整体防灾抗灾能力。

Finally, the adaptive control strategy of active balancing for a strictly positive and real rotor with actuator time delay is successfully extended to a flexible rotor with single collocated plane and a flexible rotor with multiple collocated planes. A series of numerical simulations demonstrate that the proposed controller is valid to suppress the imbalance-induced vibration of these rotor systems.

最后，把带作动器时迟的严格正实转子系统的自适应控制策略成功地推广到具有单并置平面的柔性转子及具有多并置平面的柔性转子，一系列数值模拟验证了该控制律对抑制这些转子不平衡振动的有效性。

The main products are: Digital frequency shift sound reinforcement equipment, DSP acoustic feedback suppression sound reinforcement equipment, digital conference system, simultaneous interpretation system, network will pass (web conferencing with USB SPEAKER PHONE), echo cancellation, and microphone interface, conference-style goose neck microphone, high-fidelityùmeetings, professional microphone and so on.

主要产品有：数字移频扩声设备、DSP声反馈抑制扩声设备、数字化会议系统、同声传译系统、网会通（网络会议用USB SPEAKER PHONE）、回声消除器、界面话筒、会议式鹅颈话筒、高保真会议音柱、专业麦克风等。

After states of reference chaos system and the controlled system were obtained through tracking differentiators, the expected dynamic system was designed according to tracking performance demands, and certain order inverse of the controlled system was constructed by using inverse system theory.

通过微分跟随器提取混沌参考系统状态和受控系统状态，依照跟踪性能要求设计期望的动态系统，借助逆系统理论得到受控系统确定阶的逆，考虑幅值、相位调整和噪声抑制的需要设计滤波器。

After a 2-h contact interval, the patch was removed, and the rats were tested by three sets of six pinpricks. Inhibition of withdrawal to pain and cutaneous trunci muscle reflex were graded.

每过2h 将药液清除，用3套6针的刺激器来测试，对疼痛的撤退抑制和躯干表面的肌肉反射进行评级。

One sideband of the generated SSBRZ signal is suppressed more effectively without distortion of the optical pulses.

通过合理设置调制器的偏置电压，使产生的SSBRZ信号的一个边带得到更有效的抑制，而且没有引起光脉冲的变形。

The effects of Mach-Zehnder Modulator bias-drifting and chirp on the single sideband radio over fiber link were investigated and simulated.

分析了光纤无线通信系统中的马赫-曾德尔调制器偏置漂移和啁啾效应，计算了单边带调制RoF链路输出目标谐波的功率抖动和谐波抑制比。

The direct current of transformer primary windings is sensed.

仿真和实验结果表明，所提出的方案可以有效地抑制逆变器变压器的直流偏磁。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。