查询词典 actuators

In the light of hysteresis, creep and nonlinearity of piezoelectric actuators, two control methods are presented. One is PID feedback control with BP neural network modeling in feedforward loop. Another is Fuzzy-PI sectionalized multimodal control. They are used for highspeed and precise position control of models driven by piezoelectric actuators.

针对压电陶瓷存在迟滞、蠕变和位移非线性等不足，提出了两种压电陶瓷微位移驱动器的位置闭环控制方法：带有BP神经网络前馈模型的PID控制方法和Fuzzy—PI多模态分段控制方法，实现了压电陶瓷微位移驱动器快速、高精度的位置控制。

Unlike typical electric actuators, Beck damper drives and valve actuators are capable of continuous modulation and precision control without thermal duty-cycle or motor burnout concerns.

与典型的电动执行器不同，Beck阻尼器和阀门执行器能够连续调制和精度控制。

To control and use the actuators, it is necessary to establish an accurate model of the actuators.

为了控制及使用致动器，必须建立其准确的数学模型。

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。

Shunt valve, Safety Valves is to make the hydraulic system by the same supply of energy to the two actuators the same flow, in order to achieve the speed of the two actuators synchronized or fixed-Belgian relations.

分流阀的作用，是使液压系统中由同一个能源向两个执行元件供应相同的流量，以实现两个执行元件的速度保持同步或定比关系。

Olive-green metal connector , limit switch actuators have a round ,black plastic connector ;and MX actuators have a rectangular , white plastic connector.

橄榄绿色的金属连接器，限位开关驱动器有一个圆形，黑色塑料连接器；和MX驱动器有一个长方形，白色塑料连接器。

Based on the theoretical and experimental studies in electrical and mechanical parameters, micro-perforated absorption material in the box, and positions optimization of the actuators and attached masses on the panel, several optimization methods for the acoustic performance of panel speaker are proposed.

基于对平板扬声器电－力参数测量、箱体内衬微穿孔吸声材料、驱动器以及附加质量位置优化的理论研究和实验测试，提出了若干种提高平板扬声器声性能的方法。

Control actuators should be located adjacent to associated displays so as to make their relationship to the operator.

控制器应该放置在相关显示的附近，以便他们的功能对于操作者是明显的。

The limitations of air cylinder actuators are mechanical spring limits and thrust requirements in excess of 75,000 Ibs.

空气缸体执行机构的局限性在于机械弹簧的局限性和要求推力不超过75，000磅。

So in this paper based on the characteristics and the optimum state theory of the vehicle, some kinds of control schemes are compared and discussed, and the fuzzy PID control scheme is adopted at last. The relation between air-cushion pressure and fan rotational speed on the optimum driving state is studied. The cushion pressure is used as controlled variable and the fan revolution is used as regulated variable. And transducer and fan motor are actuators.Based on the structure and operating properties of half-tracked air-cushion vehicle, the control system scheme and structure are presented. A control scheme using the self-tuning PID fuzzy logical controller is adopted. Fuzzy rules are set up and some researches have been done for fuzzy tuning method. At the same time the real-time measurement scheme by computer control is proposed, and electric circuits are designed. In the control system of half-tracked air-cushion vehicle cushion pressure P〓 is used as controlled variable and the fan speed n〓 as regulated variable.

因此本文以半履带式气垫车的特性和最佳工作状态理论为指导，通过对各种控制方法的比较与探讨，提出采用模糊PID控制方案，并且研究了在最佳工作状态下垫压及风机转速的关系，提出气垫压力作为控制参数，变频器和风机电机为执行机构，风机转速为调节量；主要进行了自整定模糊PID控制器的设计，研究了自整定PID模糊控制器的实现方法，编制了模糊控制规则，制定了模糊控制参数查询表，并分析了影响自整定模糊控制器相关的影响因素，确定了模糊控制表；为了实现半履带式气垫车的自动控制，还提出了计算机模糊控制系统的原理与结构，设计了相应的测量电路与控制软件。

Must have Coordination and negotiation skill, flexible ideas, and be punctilious person.

必须具备较好的协调与谈判能力，头脑灵活，工作认真仔细

Result: 18 patients are all with simple eye.The pigment mole lies in nasal and temple sides of the ball conjunctiva,in which 2 lie in lacrimal caruncle and semilunar plica.

结果：18例患者均为单眼，色素痣大多数位于内外侧睑裂部球结膜面，2例位于泪阜及半月皱襞，经激光治疗后，10例色素痣消失，有5例行再次激光后消失，2例行第三次激光后消失，1例第四次激光后消失。