电液位置伺服系统模型辨识与非线性控制

针对电液伺服系统非线性、参数时变的特点,为提高系统的性能,首先介绍了电液位置伺服控制系统的组成与工作原理,讨论了系统的非线性数学模型,利用实时工作间(RTW)的半实物仿真环境和MATLAB系统辨识工具箱,对电液位置伺服系统进行了系统模型辨识及验证。在此基础上,以辨识得到的模型为控制对象提出了一种Bang-Bang与模糊PID非线性控制方案,与传统PID以及模糊PID控制方法进行了仿真比较。结果表明,采用Bang-Bang与模糊PID复合控制,在系统参数变化、外界扰动的影响下,系统的快速性提高,稳态误差得到消除,具有较好的动态鲁棒性能。     

机务段设备管理信息系统的开发

铁路现有的设备管理信息系统很多是基于单机系统的，这使得设备的管理与资料的更新不能及时进行。结合机务段的现状，提出了基于C／S结构的机务段设备管理信息系统，实现设备的信息化管理。     

Hardware-in-loop simulation on hydrostatic thrust bearing worktable pose

A controllable hydrostatic thrust bearing was presented to improve rigidity. The bearing worktable poses were controlled by coupling oilfilm thickness of four controllable chambers. The chamber flow can be regulated by electro hydraulic servo valve-control variable pump according to the surface roughness, load, cutting force, and thermal effects of worktable. The mathematical models of the controllable chamber flow, servo variable mechanism and controller were built. The pose control model was established, which contained the kinematics positive and negative solution and control strategy of feedforward and hydraulic cylinder position feedback. Hardware-in-loop simulation experiment was carried out on the electro hydraulic servo test bench by means of the non-linear relation of film thickness and hydraulic cylinder displacement. Hardware-in-loop simulation experiment results show that the controllable bearings exhibit high oilfilm rigidity, the rising time is 0.24 s and the maximum overshoot is 2.23%, and can be applied in high precision heavy machine tool.     

小康住宅声,光,热物理环境的模糊综合评价

用模糊综合评价的数学方法,对小康住宅声,光,热物理环境进行综合评价。     

基于迷惑与误导的加密

本文提出了一系列基于迷惑与误导的加密方式,分别对唯密文攻击、已知明文攻击、选择明文攻击一一进行迷惑与误导。文中还提出迷惑计算机及其人工智能,使密码分析工作必须动用大量的人参与,使分析无法在有效时间内完成。     

高压下KTi2(PO4)3晶体相变的Raman光谱研究

用Raman光谱技术研究快离子晶体化合物KTi2(PO4)3在高压下的结构相变,通过对样品在不同压力下Raman光谱带的变化及振动峰半宽度和γ-P曲线发生突变现象的分析,确定该晶体分别在3 GPa和6 GPa附近发生两次结构相变.