Vibrational Mode in Two-Dimensional Dust Monolayer with Finite Size Dust Grains

Vibrational mode in a two-dimensional dust monolayer is investigated by considering the finite size of dust grains. Each dust grain is assumed to be a negative point charge and a dipole moment due to the inhomogeneous charge distribution on its surface. The dispersion relation of the vibrational mode is derived. Both the self-excited and externally excited cases are discussed. It is shown that the mode is sensitive to the direction of the dipole moment.     

板料折弯机调节机构的改进

通过调节机构的改进,重复精度达到了要求,减少了废品量,节约了成本,提高了生产效率。     

纤维表面处理对植物纤维增强水泥的物理力学性能影响

植物纤维增强水泥的力学性能具有湿敏感性，随湿度增加弯曲强度下降幅度较大。本文工作采用的几种浸渍处理纤维表面的方法，有效地改善了这种状况，其中一种经处理的纤维增强水泥较没有处理的对比试样在饱水状态下的弯曲强度提高了67％，气干状态提高了18％，缩小了二者间的差距。     

均布压力作用下厚壁圆管弯矩计算方法的探讨

建立了厚壁圆管弯矩计算公式，通过分析的均布压力作用下厚壁圆管与薄壁圆管压力相对误差，给出了厚壁圆管与薄壁圆管分类原则，了解和掌握这一原则对工程师大有禅益。     

用于数控设备的弹性环联轴器

介绍了一种适用于数控设备改造的无键联轴器，从其原理、设计、加工各方面作了阐述，并且总结了许 多实际应用经验和适用参数。     

Robot control and parameter estimation with only joint position measurements

Most adaptive control schemes for rigid robots assume velocities measurements to be available. Although it is possible to measure velocities by using tachometers, this increases costs and the signals delivered may be contaminated with noise. Since the use of encoders allows to read joint position pretty accurately, it is desirable to estimate joint velocities through an observer. This paper presents an adaptive scheme designed in conjunction with a linear observer. Boundedness of the estimated parameters and uniform ultimate boundedness for the tracking and observation errors are guaranteed. Experimental results are included to support the developed theory.     

供应链库存管理的几项措施

供应链库存管理与某一部门的管理有极大的不同，它涉及到各部门，各企业之间存在着的错综复杂的工序关系和不确定性。     

莱钢冷轧轧机弯辊控制系统分析

对莱钢冷轧六辊单机架的弯辊系统进行研究与分析,介绍板形控制系统的原理和使用效果。     

基于CAE的平流式换热器无模成型工艺开发

为实现高效的平流式换热器柔性弯曲制造,避免模具对制品的损伤,采用仿真与试验相结合的方法实现平流式换热器无模弯曲工艺开发.与传统的换热器绕弯成型技术相比,该成型过程无须弯曲模,而是通过控制换热器两端的运动轨迹实现弯曲成型,改变相应的运动轨迹能实现不同的弯曲半径.在成型原理分析的基础上,建立无模弯曲成型过程的有限元仿真模型,并基于仿真结果确定合理的弯曲速度、夹头长度和中性层半径等工艺参数.设计并制造无模弯曲成型试验装置,并研究翅片结构等因素对成型质量的影响.