基于压电驱动的纳米级精密定位系统的研究

利用压电陶瓷致动器作为驱动元件设计了X-Y两自由度精密定位工作台,并利用有限元分析法对机构进行了优化设计,采用电阻应变片作为微位移检测传感器,在此基础上设计了闭环控制器,该控制器包括压电陶瓷驱动单元、微位移传感器检测单元和中央处理单元,最后利用PID控制法进行了闭环控制实验研究。实验结果表明,本系统具有较好的控制品质和优异的动态性能,在对10μm×10μm两自由度工作台的控制中,闭环控制精度达10nm,阶跃响应的稳定时间小于8ms。     

Using a Walking Piezo Actuator to Drive and Control a High-Precision Stage

Piezoelectric actuators are commonly used for micropositioning systems at nanometer resolution. Increasing demands regarding the speed and accuracy are inducing the need for new actuators and new drive principles. A nonresonant piezoelectric actuator is used to drive a stage with 1-DOF through four piezoelectric drive legs. In order to improve the positioning accuracy of the stage, a new drive principle and control strategy for the walking piezomotor are proposed in this paper. The proposed drive principle results in overlapping tip trajectories of the drive legs, resulting in a continuous and smooth drive movement. Gain scheduling feedback in combination with feedforward control further improves the performance of the stage. With the developed drive principle and control strategy, the piezomotor is able to drive the stage at constant velocities between 100 nm/s and 1 $mu$m/s with a tracking error below the encoder resolution of 5 nm. Constant velocities up to 2 mm/s are performed with tracking errors below 400 nm. Point-to-point movements between 5 nm and the complete stroke of the stage are performed with a final static error below the encoder resolution.      

非对称光纤悬臂探头的驱动优化研究

研制了一种适用于内窥光学相干层析成像的单驱动非对称光纤悬臂扫描探头,可以利用单一驱动信号来激发非对称光纤悬臂的光纤末端沿李萨茹图形进行二维扫描。但是,正弦驱动信号激发的李萨茹轨迹在均匀性、覆盖率和图案帧频之间的权衡方面存在一定限制,不利于扫描成像的优化。基于非对称光纤悬臂固有的响应特性,提出了振幅调制正弦驱动信号来进行二维扫描轨迹图案的优化,并模拟研究了不同驱动信号下的扫描轨迹,对比评价了各种驱动信号下扫描图案的均匀性和覆盖率,同时进行了对比实验,验证了该方案的可行性。     

基于高效率SVPWH控制的电动舵机

论文分析了装备于导弹上的电动舵机系统的SVPWM控制方法，针对弹载电动舵机采用低压电源的特点，对电动机、功率器件以及电路控制方法进行了研究。论文采用功率MOSFET以实现低功耗运行，在数字化控制中对SVPWM采用相位补偿的控制方法。最后给出了系统的试验波形和结论。     

高速压电陶瓷驱动电源

为了满足压电陶瓷致动器对驱动电源动态冲击特性的要求,提出一种新型的压电陶瓷驱动电源.用高速运放OP467作为核心芯片,搭建功率放大电路及恒流源泄放电路,并给出详细的电路原理图.实验表明,在输入为方波等动态信号时,该驱动电源可以良好地跟随输入波形变化,具有较高的上升和下降速率,频响范围可达到100 Hz～60 kHz.在同类型高压放大器中,其成本低廉,结构简单.     

LG MT-50PZ41

韩国的LG公司，是目前为数不多的等离子显示屏器件制造及供应商之一。为了与日本各大电子公司抗衡，LG公司在等离子显示技术出现初期就积极参与，并投巨资进行了大量的研发工作及生产准备，所以当等离子显示器正式商品化进入市场后，大家除能看到日本松下、先锋等等离子显示技术倡导者的产品外，同时也能看到LG的产品。而据悉日本另外几家较有名的视频产品制造商反倒没有自行制造等离子显示屏器件．     

一种新型高精度线性压电激励器的研制

报道了一种新型压电线性激励器，设计出它的结构，完成了器件制作。设计测试系统对其性能进行测试。器件的线性步进位移特性明显，具有步进模式和连续线性位移模式。行程可达几个厘米、位移分辨率为0．1μm、运行速度可达0．6mm/s。激励器结构简单，控制方便，适于研制闭环控制高精度定位系统。     

Panasonic(松下)TH-50PZ700C

自1918年创立以来，松下电器通过提供高品质、高性能的商品和优质的服务，以“为了使人们的生活变得更加丰富、更加舒适”为经营理念，不断推进各种各类高品质的电子产品，是具有影响力的消费电子品牌。长期以来，电视一直是松下的主打产品，进入平板时代，松下以等离子为主打产品，今年则以全高清等离子为主线。本次参与测评的正是其最新推出的TH-50PZ700C。     

压电陶瓷烧结炉温度控制的实现

烧结炉主要用于压电陶瓷的烧结,是整个压电陶瓷生产工艺流程中的关键设备之一,其主要功能在于对叠压和热切后的陶瓷片进行排胶和烧结成型。主要从炉体结构上和电气控制上介绍压电陶瓷烧结炉的温度实现,重点介绍控制系统的硬件控制组成及原理和软件控制,以及在炉体设计时体现出的独特的设计理念和创新性。     

Development and Analysis of a High Thrust Force Direct-Drive Linear Actuator

This paper presents the design and analysis of a novel high thrust force linear actuator with high backdrivability. This motor consists of a mover and a stator with spiral (helical) structure. The mover moves spirally in the stator, and the linear motion is extracted to drive the load. This motor is a direct-drive system and highly backdrivable. In this paper, a basic model and thrust-force/torque equations are proposed, and finite-element method analysis and experimental results of a prototype are presented. From experiments, the designed spiral motor achieves 2000-N rated thrust force. The thrust-force capabilities of the spiral motor are compared with other linear motors. It is confirmed that the spiral motor is almost close to the latest state of the art in linear motor technology.     

压电扬声器的兴衰

简述了压电陶瓷高音扬声器的兴衰史,对MikeKlasto的观点进行了补充。回顾并展望了压电扬声器的技术及其发展前景。     

怎样评判优秀的大容量电子邮件系统

在中国,邮件服务已是各ISP、综合性网站和专业性网站的必备项目,收发邮件已成为中国网民上网的首要理由。大容量支持且高效、可靠的邮件系统应具有的标准主要有：安全性和垃圾邮件的防范、可靠性、高效灵活、可扩展性、用户的自我管理和测试及售后支持等。     

大容量数字蜂窝网的竞赛

大容量数字蜂窝技术不仅可以应用在移动通信方面，还可取代传统的有线通信方式，来提供性能价格比优良的无线电话服务，这一技术可以缩短短设备安装时间，降低运营成本，对于那些想要迅速建立现代电信网络、提高电话普及率的国家和地区尤为适宜。     

大容量真空灭弧室的设计

结合一个具有典型参数的真空灭弧室,介绍了大容量的真空灭弧室的设计思路.     

压电陶瓷的新应用及新工艺

压电器件及其应用的发展,取决于压电材料种类的更新和性能的提高。随着新工艺和新材料的出现,压电器件的应用也日新月异。文章介绍了压电材料近来的一些新应用及新工艺。     

基于NFC的大容量信息推送技术研究

文章通过分析NFC技术特点,指出NFC应用现状存在问题的同时,提出基于NFC和3G融合技术的大容量信息推送方案,为高数据速率要求的NFC业务提供解决方案。     

A Multi-Bit-Rate Substitute-Communication System with High Call-Carrying Capacity

A multi-bit-rate substitute-communication system (MSCS) is an efficient means to achieve higher call-carrying capacity in a congested network. When a trunk line is congested with a large amount of traffic, MSCS makes subscribers communicate by a lowerbit-rate medium, even though they request higher-bit-rate forms. This limitation is made when the number of idle basic channels is less than or equal to the predetermined system constant. This paper describes the control method, traffic characteristics, and concrete traffic design method, using a dual-bit-rate class (64 kbits/s, 8 kbits/s) model. It is found that the MSCS carries about five times as many calls as a conventional network without the MSCS.     

A High Capacity Multihop Packet CDMA Wireless Network

Wireless multihop networks overlaid with cellular structure have the potential to support high data rate Internet traffic. In this paper, we consider techniques by which the system capacity of such networks can be increased. First, methods for increasing link capacity in single-user systems are explored. Subsequently, we consider a different set of techniques suitable for multiuser systems. We also investigate the effect of traffic dynamics on system capacity and ways to achieve the maximum throughput. Finally, we present capacity bounds which illustrate how these techniques help in trading off the conserved power for capacity advantage.     

16 QAM Modulation for High Capacity Digital Radio System

A computational method allowing the calculation of bit error rate in the presence of filtering and some other impairments is described for 16 QAM modulation; a breadboard working at a bit rate of 140 Mbits/s has been implemented and experimental results are compared with calculated values. The possible use of this modulation type for a high capacity digital radio-relay system is considered. Some parameters are introduced for this purpose, especially the net fade margin parameter. In the case of the 140 Mbit/s system in the 10.7-11.7 GHz frequency band, 4 PSK and 8 PSK modulation types are compared with 16 QAM. System gain, frequency arrangement, nodal capacity and outage performances are evaluated.