单相短柱型直线超声电机的设计

提出了一种单相驱动的立式短柱型压电直线超声电机,论述了该电机的动作原理和设计过程。该电机利用纵向振动和横向振动的耦合模态工作。为获得同一驱动频率的一致的双向运动特性,该电机采用对称结构,利用压电陶瓷在短路和开路时弹性模量存在差异的特性,用单相驱动信号实现了纵向和弯曲耦合模态的有效激发。以增大电机弯曲振动模态前后振幅比为目标,利用三自由度集中质量的简化模型,优化了定子的结构。制作了电机的原理样机,对其进行了输出性能测试。实验结果表明,电机的输出性能良好。电机定子长22 mm,自重3.3 g,0.3 N输出推力下最大速度达140 mm/s,5 N预压力下最大输出推力近1 N。     

一种弯曲模态直线超声电机的研究

提出了一种改进的弯曲模态直线超声电机。该电机利用兰杰文振子两相正交的3阶弯曲振动,在其驱动足处形成椭圆运动,推动动子运动。采用超声变幅放大了定子驱动足处的振幅。利用有限元方法用来设计定子的结构尺寸。实验表明,在电压峰-峰值200V下,该电机最大空载速度为113mm/s,最大输出力为10N。     

一种新型直动式压电直线电机的设计

为研制高精度、大行程、宽频响的压电直线电机,提出了一种基于叠层型压电陶瓷的直动式压电直线电机.分析了电机的工作原理,对电机的结构进行了设计,制作了原理样机,并进行了实验研究.实验表明,在一定频率范围内,定子驱动足纵向振幅保持不变,且最大幅值为900 nm,电机最大无负载速度为4.8 mm/s,最大输出推力为4.5 N.     

微小型驻波超声电机定子振动特性的仿真分析

针对直径10 mm的两种驻波型超声电机定子的振动特性进行有限元仿真分析。利用ANSYS有限元软件建立定子的有限元模型,进行了振动模态及谐响应的仿真分析,获得定子的主要振动模态、模态频率及振幅。探讨了2种压电陶瓷及定子长度对其谐振频率和振幅的影响。研究结果表明,驻波型超声电机定子上斜槽或斜齿结构可实现模态转换,是实现电机驱动的关键。在分析的两种驻波型超声电机的8个定子中,采用PZT4压电陶瓷材料、长度16 mm的斜槽式超声电机定子的振幅值最大。     

一种新型双驱动足直线超声电机的研究

提出一种新型的双驱动足直线超声电机.该电机定子为圆柱结构,2个正交的4阶同形弯曲模态为工作模态.在相差90°的两相同频率电信号激励下,定子产生回转运动,其上两个作为驱动足的圆盘交替推动直线导轨,实现双向直线运动.原理样机的最大推力为5.5 N,速度为103 mm/s,效率为33%.     

一种不对称激励直线型驻波超声电机的研究

设计研制了一种新型的不对称激励的单足直线型驻波超声波电机,电机定子为一块尺寸为26 mm×13 mm×2 mm (X,Y,Z)矩形铜板和对称粘结其上表面的两块压电陶瓷片组成的复合结构.电机只有一种振动模态且只需单一频率驱动,利用不对称激励使驱动足端产生椭圆运动,不需调整不同模态的频率一致性,结构简单.通过有限元分析确定了电机的结构尺寸,由谐响应分析对电机的激励工作机理进行了分析.最后对制作的样机进行了实验测试,试验结果与理论设计一致.在激励电压为150 V,激励频率为151.9 kHz的激励条件下,测得电机最大输出推力为0.855 N,电机速度为260 mm/s.     

双变幅杆V形直线超声电机研究

提出一种改进的V形直线超声电机.该电机利用两垂直兰杰文振子的纵、弯振动,在其驱动足处形成椭圆运动,推动动子运动.采用超声变幅杆结构的兰杰文振子,放大了定子驱动足处的振幅.有限元法用来设计定子结构尺寸,调节对称模态与反对称模态的频率一致性.实验表明,在预压力50 N下,该电机最大空载速度为235 mm/s,最大输出力21.4 N,定子质量为87.3 g,推重比达25.     

新型面内纵-弯复合型直线超声电机研究

为了找到一种推重比大、更利于微型化的定子结构,设计并研制了一种面内纵-弯复合型直线超声电机。探讨了该型电机的工作原理及定子驱动足椭圆轨迹形成条件,并利用有限元分析软件对定子结构进行优化设计。制作了样机,且验证了电机设计的可行性和合理性,并开展了定子驱动足振动性能和电机输出性能的实验研究。结果表明,在激励电压峰-峰值200 V、预压力20 N、激励频率45.7 kHz、相位差90°条件下,电机左、右运行的空载速度分别为0.25 m/s和0.22 m/s,最大推力为3.4 N,推重比达47(定子质量为7.36 g)。与面内纵-弯直线超声电机原型样机相比,开槽定子的驱动足振幅增大,电机输出速度和推力显著提高(空载速度提升了51.5%,最大推力提高了36%),有利于直线超声电机的微小型化。     

一类面内弯曲模态行波直线超声电机的研究

提出了一种新型含有不完全齿的圆环型行波直线超声电机,电机的动子滑块在一定预压力下紧贴在圆环型振子外表面齿形结构的端面上,4个压电陶瓷片间隔90°均布于圆环型结构的内侧,4组驱动齿分别与压电陶瓷片位置间隔45°布置。电机工作时,仅一处驱动齿工作,通过轮换不同工作齿的方式可提高超声电机的寿命。电机利用两个同频正交的面内三阶弯曲模态工作。利用有限元软件对振子进行了动态设计与仿真,分析了结构参数对模态的影响。加工制作了原理样机,并测试了样机的振动特性及输出性能。实验结果表明,该电机在激励电压峰-峰值为240 V,激振频率为30.459 kHz,预压力为0.6 N时,电机运行平稳,最大输出力为90 mN,电机的空载速度为102 mm/s。     

大推力低矮式直线超声电机的研究

提出了一种定子高度尺寸不足20 cm的直线型微型压电超声电机,并通过原理样机的实验研究证实其合理性和可行性.该电机体积小,输出功率较大,最大速度可达150 mm/s,输出推力为3 N,能满足一般的驱动和控制要求,适用于要求结构紧凑、成本相对较低的应用场合.     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and subpixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

社长序言（英文）

正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta-     

Call for Papers

正Introduction Jointly sponsored by the China Institute of Communications(CIC)and the IEEE Communications Society(IEEE ComSoc)since the year 2013,China Communications,currently,is aiming to gradually realise the transition from journal to magazine content and style.     

INTEGRATION OF OPTICAL AND WIRELESS NETWORKS

正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must     

Call for Papers—Feature Topic,Vol.12,No.3,2015

正Smart Grid Communications The electric power industry is undergoing profound changes as the industry aims to capture the promise of a smart grid for a sustainable energy future.Enabled by the advanced sensing devices such as Phasor Measurement Units(PMUs),increasingly powerful