西门子SIMOTION Delta 3D picker模型应用

本文主要介绍SIMOTION运动控制系统中Delta 3D picker功能的实际应用,阐述了Delta 3D机构的控制参数设定、原点设置、三种路径插补功能在运动轨迹控制中的应用。     

Study of Quintic Spline Interpolation and Generated Velocity Profile for High Speed Machining

Modern high speed machining (HSM) machine tools often operates at high speed and high feedrate with high ac- celerations,in order to deliver the rapid feed motion.This paper presents an interpolation algorithm to generate continuous quintic spline toolpaths,with a constant travel increment at each step,while the smoother accelerations and jerks of two-order curve are obtained.Then an approach for reducing the feedrate fluctuation in high speed spline interpolation is presented.The presented ap- proach has been validated to quickly,reliably and effective with the simulation.     

Meshless local Petrov-Galerkin method for continuously nonhomogeneous linear viscoelastic solids

A meshless method based on the local Petrov-Galerkin approach is proposed for the solution of quasi-static and transient dynamic problems in two-dimensional (2-D) nonhomogeneous linear viscoelastic media. A unit step function is used as the test functions in the local weak form. It is leading to local boundary integral equations (LBIEs) involving only a domain-integral in the case of transient dynamic problems. The correspondence principle is applied to such nonhomogeneous linear viscoelastic solids where relaxation moduli are separable in space and time variables. Then, the LBIEs are formulated for the Laplace-transformed viscoelastic problem. The analyzed domain is covered by small subdomains with a simple geometry such as circles in 2-D problems. The moving least squares (MLS) method is used for approximation of physical quantities in LBIEs.     

Analysis of a Gyroscope＇s Rotor Nonlinear Supported Magnetic Field Based on the B-Spline Wavelet-FEM

A supported framework of a gyroscope＇s rotor is designed and the B-Spline wavelet finite element model of nonlinear supported magnetic field is worked out. A new finite element space is studied in which the scaling function of the B-spline wavelet is considered as the shape function of a tetrahedton. The magnetic field is spited by an artificial absorbing body which used the condition of field radiating, so the solution is unique. The resolution is improved via the varying gradient of the B-spline function under the condition of unchanging gridding. So there are some advantages in dealing with the focus flux and a high varying gradient result from a nonlinear magnetic field. The result is more practical. Plots of flux and in the space is studied via simulating the supported system model. The results of the study are useful in the research of the supported magnetic system for the gyroscope rotor.     

Synthesis and Characterization of Nanocapsules of a-Fe(NiCoAl) Solid-solution

α-Fe(NiCoAl) solid-solution nanocapsules were prepared with pure powders of Fe, Ni, Co and Al by the plasma arc-discharging using a copper crucible. The shapes of the nanocapsules are in polyhedrons with the core/shell structure. The body centered cubic (BCC) phase is formed in the core. The size of the nanocapsules is in the range of 10~120 nm and the thickness of the shell is 4~11 nm. Saturation magnetization Js=150 Am2/kg and coercivity iHC=24.3 kA/m are achieved for the nanocapsules.     

基于离散泰勒级数的新型联想记忆系统

基于离散泰勒级数提出一种对任意阶多维函数可实现无差逼近的新型联想记忆系统，详细讨论了该系统的插值算法、训练规则及寻址机制，新型联想记忆系统相对于CMAC具有逼近精度更高、占用存储单元较少、学习速度较快等优点，该系统在信号处理、模式识别、过程建模及高精度实时智能控制等领域具有广泛的应用价值，仿真实例表明了系统的可行性与有效性。     

基于抑制弧Petri网的离散事件系统的监控理论综述

利用Petri网的抑制弧实现离散事件系统的监控是离散事件系统监控理论的一个新进展。对抑制弧Petri网作了简单的介绍，并给出了该监控理论的基本原理．详细地回顾和总结了该理论的四种方法，即：结合自动机的字符串避免方法、抑制弧方法、基于抑制弧的状态避免控制器方法以及加权抑制弧方法，分别分析了这几种方法各自的利弊。最后对其可能的发展作了展望。     

圆锥相贯线的数控切割原理

对圆锥面上的两种相贯线进行了分析，获得了数控切割加工的理论模型，并介绍了为解决这类空间曲线切割加工而研制的数控切割设备，以及该设备在宝山钢铁公司３号高炉制造中的成功使用     

平面四点确定一条抛物线及其在参数插值中的应用

本文讨论了用平面有序四点确定一条抛物线及其在参数插值中的应用。提出了有用四点确定一条抛物线的算法，讨论了确定抛物线的四点相互间要满足的位置。对平面给定的一组数据点，提出了构造参数插值曲线的新方法。所构造的插值曲线是ＧＣ＾１连续的分片三次参数曲线，其插值精度为二次参数多项式。本文还以计算实例对新方法与其它方法的插值精度进行了比较。