常规游梁式抽油机摇杆平衡装置

摇杆平衡节能装置,是通过在游梁抽油机游梁尾端及连杆中部(或横梁)安装可变臂的平衡装置,有效改变抽油机平衡力臂长度,使得光杆负荷峰值扭矩与抽油机平衡峰值扭矩能够相对同步产生,从而达成消除电流峰值,达到节能降耗的目的。摇杆平衡节能装置在使用时,抽油机的冲次应不高于5次,上下冲程中光杆载荷差应小于4t;该装置不适应玻璃杆抽油井,不适应在已进行过节能改造的抽油机上应用。     

The Effect of Intensity Pulsed Ion Beam Irradiation on Wear Resistance of High-speed Steel

INTENSITY pulsed ion beam(IPIB)technology hasbeen developed over the last two decades primarily fornuclear fusion and high-energy density physicsresearch,which is also named as high-intensity pulsedion beam technology(HPIB)and becomes a newmodification technique of materials surface such as inthe fields of metal materials modification,functionalfilms and nano-powder synthesis[1-5].Directdeposition of a beam into a solid surface results in arapid melt and resolidification with heating and…     

Beam search algorithms for the single machine total weighted tardiness scheduling problem with sequence-dependent setups

In this paper, we consider the single machine weighted tardiness scheduling problem with sequence-dependent setups. We present heuristic algorithms based on the beam search technique. These algorithms include classic beam search procedures, as well as the filtered and recovering variants. Previous beam search implementations use fixed beam and filter widths. We consider the usual fixed width algorithms, and develop new versions that use variable beam and filter widths.     

海底地形测量波束角效应的建模与仿真

为了解决回声测深仪波束角效应引起测深图像产生失真变形的问题,应用微分几何的原理对波束角角效应的空间结构及其数学原理进行建模.找出失真规律,并提出了波束角效应的失真模型.模型的优越之处在于提出决定波束角效应发生作用的是海底地形的线性特征而不是形状特征.最后设计仿真试验对模型进行了验证,仿真结果证明了模型的正确性.     

高压变频器在重钢步进梁式加热炉风机控制中的应用

本文介绍HARSVERT—A系列高压变频器在重钢宽厚板工程步进梁式加热炉风机功率控制中的应用,主要论述了所采用的高压变频器的原理及控制系统技术方案。     

一种改进的波束域ESPRIT算法

高分辨方位估计技术在声纳、雷达、通信、地质探测等众多应用领域中占有十分重要的地位.ESPRIT算法作为一种成熟的高分辨算法有运算量小的优点,但其减小了阵列的有效孔径,在现有的高分辨处理设备中,由于空间的限制,阵列不可能随意增大,因此要最大限度的扩大阵列的有效孔径.通过对均匀线列阵下波束域ESPRIT算法(BmESPRIT)的研究,提出了一种基于ESPRIT的新算法,并给出了转换成波束域处理的构造方法.该算法利用后向平移技术,使两子阵列与原阵列具有相同的有效孔径.有效的利用了阵列资源.仿真结果表明在相同条件下该算法的估计性能明显提高.     

The Ground Process Segment of SAR Altimeter

The key innovation technology of SAR Altimeter (Synthetic Aperture Radar Altimeter)are Doppler\|beam sharpen and delay/Doppler range compensation.The cooperation of these two technologies makes it has high along track resolution and high precision in height measurement.The ground processor is the key hinge to make sure that SAR altimeter could obtain these superiorities.Many key technologies for SAR altimeter processor,such as Doppler beam\|sharpen,delay/Doppler compensation and the second range correction,multilook,echo model and gradient function for retracker,are introduced in the paper.Based on the processor and related work,some simulation work and airborne experiment were tested by the processor,and both of the quantity results show that the SAR altimeter has more potential superiorities.     

Identification of variable coefficients for vibrating systems by boundary control and observation

We consider the identification problem of coefficients for vibrating systems described by a Euler-Bernoulli beam eq~. ation Or a string equation, with one end clamped and with an input exerted on the other end. For the beam equation, the observations are the velocity and the angle velocity at the free end, while for the string equation, the observation is the velocity at the free end. In the framework of well-posed linear system theory, we show that both the density and the flexural rigidity of the beam, and the tension of the string, can be uniquely determined by the observations for all positive times. Moreover, a general constructive method is developed to show that the mass density and the elastic modulus of the string are not determined by the observation.     

改进的Beam方程Strichartz估计及其应用

从文献[1]中的色散估计出发,以Littlewood-Paley理论为工具,在前人工作的基础上,给出了Beam方程utt+Δ2u+u+h=0的一个改进形式的Strichartz估计。作为应用,借助不动点方法,证明了非聚焦Beam方程在次临界情形的整体适定性。     

High-intensity multi-bunch beam generation by a photo-cathode RF gun

A multi-bunch photo-cathode RF gun system has been developed as an electron source for the production of intense quasi-monochromatic X-rays based on inverse Compton scattering. The desired multi-bunch beam is 100 bunches/pulse with a total charge of 500 nC and a bunch spacing of 2.8 ns. We modified the gun cavity of a ‘BNL-type IV’ RF gun to allow a CsTe cathode plug in the end plate. The system uses a four-dipole chicane beam line to allow the injection of laser light normal to the cathode surface. We compensate the gun cavity beam loading caused by the high-intensity multi-bunch electron beam by injecting the laser pulse before RF power has filled the cavity. We have achieved a total intensity of 220 nC in 100 bunches with a bunch-to-bunch energy spread under 1.3% (peak-to-peak). This paper concentrates on experiments to generate the high-intensity multi-bunch beam with compensation of the bunch-to-bunch energy spread due to heavy beam loading.