基于NDIS中间层驱动程序的隐蔽通道

通过一个基于网络驱动程序接口规范中间层的驱动,在Windows网络协议栈下建立一个隐蔽通道,使应用程序可利用其直接与外界通信。该通道的作用位置相比防火墙对于协议栈的控制更为底层,可直接从网卡读写数据进行网络通信。分析防火墙由于未对网络进行完整防护而被穿透的原因,探讨抵御该类攻击的方法。     

巧用FANUC系统的刀具半径补偿功能

介绍了对刀尖补偿功能的作用、原理和使用方法 ,以车轮轮缘踏面的加工程序为例 ,说明刀具半径补偿功能的具体应用     

Predicting dam failure risk for sustainable flood retention basins: A generic case study for the wider Greater Manchester area

This study aims to provide a rapid screening tool for assessment of sustainable flood retention basins (SFRBs) to predict corresponding dam failure risks. A rapid expert-based assessment method for dam failure of SFRB supported by an artificial neural network (ANN) model has been presented. Flood storage was assessed for 110 SFRB and the corresponding Dam Failure Risk was evaluated for all dams across the wider Greater Manchester study area. The results show that Dam Failure Risk can be estimated by using the variables Dam Height, Dam Length, Maximum Flood Water Volume, Flood Water Surface Area, Mean Annual Rainfall (based on Met Office data), Altitude, Catchment Size, Urban Catchment Proportion, Forest Catchment Proportion and Managed Maximum Flood Water Volume. A cross-validation R² value of 0.70 for the ANN model signifies that the tool is likely to predict variables well for new data sets. Traditionally, dams are considered safe because they have been built according to high technical standards. However, many dams that were constructed decades ago do not meet the current state-of-the-art dam design guidelines. Spatial distribution maps show that dam failure risks of SFRB located near cities are higher than those situated in rural locations. The proposed tool could be used as an early warning system in times of heavy rainfall.     

Development of a Reconfigurable Platform for Manufacturing Equipment Control

In modern manufacturing equipment control area,controller is required to deliver higher computing capability for adopting advanced algorithms to meet speed and accuracy requirements,and reconfigurabilities for changing or(and)adding features or functions.This paper presents a methodology in design and implementation of a high performance and reconfigurable platform for manufacturing equipment control.This methodology is in virtue of system on a programmable chip(SoPC)technolo- gy but replacing the on-chip processor by an external high performance,floating-point digital signal processor(DSP).The appli- cation of the DSP is designed as a multi-threaded framework,which has more flexibilities than a traditional single-loop one.Fur- thermore,the field programmable gate array(FPGA)system can be reconfigured easily and quickly to meet a new requirement by dragging and dropping pre-built components in a SoPC building environment.As a result,the controller platform is more recon- figurable in terms of algorithms and functions.This platform is implemented in a 3-axis milling machine control and the result indicates that the design and implementation presented in this paper is feasible.     

Heat regulating strategy in numerical control end milling for hard metal machining

The trend in die/mold manufacturing at present is towards the hard machining at high speed to replace the electron discharge machining. Failure forms of the A1TiN-coated micro-grain carbide endmill when used for the machining of/IS SKD61 (HRC 53), a widely used material in die/mold manufacturing, are investigated. The endmill shows a characteristic that tool life decreases greatly due to the chipping when overload occurs or the rapid increase of wear when over-heat accumulation in cutting edges. As a consequence of the investigation, a strategy to regulate heat generation in the end milling process is proposed. This is accomplished by controlling the cutting arc length, i.e. the length of each flute engaging workpiece in a cutting cycle. Case studies on the slot end milling and comer rounding are conducted. The results show that the proposed strategy suggests the optimal tool path as well as the optimal pitch between successive tool paths under the cutting time criterion.     

Process Modeling for Precision Forming of Discrete Parts – State of the Technology and Critical Issues

This paper presents an overview on the application of FE simulation as a virtual manufacturing tool in designing manufacturing processes for precision parts. The processes discussed include forging, sheet metal forming and hydroforming. Determination of reliable input parameters to simulate a process is a key element in successful application of process simulation for process design in all the mentioned areas. These issues are discussed in detail. Practical examples of application of FE simulation are presented for improvement of the existing metal forming process and/or designing new metal forming process for manufacturing discrete precision parts in forging, sheet metal forming and hydroforming.     

激光强化处理参数对轧辊表面性能的影响

通过试验，研究了激光功率、光斑直径、扫描速度、搭接量和合金粉含量等激光处理工艺参数对轧辊表面性能的影响，结果表明，轧辊表面经激光淬火处理后。性能稳定，耐磨性和抗疲劳性均有所提高，达到了生产要求．     

计算机数控串珠绳锯切割机

采用模糊控制技术、变频传动技术、步进驱动技术研制出计算机数控串珠绳锯切割机.该机使用带闭环的变频传动技术取代传统的伺服传动,切割精度为0.15mm.采用IPC工控机和西门子S7-200PLC为主控机,人机界面好,易于编程.改变生产品种,只需修改数控程序,而不需制做模型,大大节省了投资.     

金属板材无模成形加工轨迹生成的研究

介绍了一种采用快速原型制造原理的金属板材无模成形技术．根据快速成形技术中分层制造的思想，从板材无模成形的技术特点出发，采用基于STL文件的金属板材无模成形的加工轨迹生成方法，通过构造STL文件的等距模型并对其进行切片，得到加工轨迹。     

高能球磨LaNi5-34%(质量分数)Mg的相组成与热稳定性能

采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、差热分析(DTA)等方法研究了高能球磨及热处理等对新型合金LaNi5-34％(质量分数)Mg的相组成、形貌及热稳定性能等的影响。结果表明：经100r／min球磨100h及190r／min球磨100h后,样品由La、Mg、Ni等非晶。微量的晶体Ni和MgNi2相组成,所得粉末的形状大多为规则的球形或近球形,其颗粒直径范围为0．05～33．0μm。球磨样品具有较好的室温活化特性，其最大电化学放电容量为460mAh／g。该样品经763K保温35d后，得到热稳定性较好的具有纳米尺度的MgNi2、Mg2Ni、Mg2NiLa三相组织，其平均晶粒直径为21.3nm。