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Fault Diagnosis Method based on System-Phenomenon-Fault Tree
System-Phenomenon-Fault Tree Fault Analysis
2011/8/4
The historical records of mechanical fault contain great amount of important information which is useful to identify the similar fault. The current fault diagnosis methods using historical records are...
Separation of Comprehensive Geometrical Errors of a 3-DoF Parallel Manipulator Based on Jacobian Matrix and its Sensitivity Analysis with Monte-Carlo Method
parallel kinematic machines (PKMs) limited-degree-of-freedom (limited-DoF) error separation
2011/8/4
Parallel kinematic machines (PKMs) have the advantages of a compact structure, high stiffness, a low moving inertia, and a high load/weight ratio. PKMs have been intensively studied since the 1980s, a...
参数曲线柔性加减速前瞻控制算法
参数曲线 柔性加减速 前瞻控制 数控
2012/3/1
针对参数曲线插补的特点,使用S形加减速和三角函数加减速相结合的柔性加减速方法对参数曲线的插补路径进行前瞻控制。在规划前瞻速度过程中,首先根据加工曲线的曲率变化自适应地将前瞻距离分为曲率上升段和曲率下降段。在对前瞻路径进行S形加减速规划时,遇到路径上曲率频繁变化段,为了减小计算量,采用三角函数加减速的方法对速度进行重新规划。这样,在满足机床加减速要求的同时降低了系统计算负荷。仿真结果和实例表明,该算...
Dynamics Analysis of a Parallel Mill-turn Tool Spindle Head Driven by Dual-Linear Motors Using Extended
NC machine tools dynamics modeling transfer matrix method (TMM)
2011/8/4
The hybrid dynamics of multi-rigid-body and multi-flexible-body system becomes the mainstream of multi-body dynamics. Currently there lacks a compact approach to model the hybrid dynamics, especially ...
基于元胞机和改进GA的大型零件柔性作业车间调度算法
元胞机 遗传算法 大型零件 柔性作业车间调度
2012/3/2
针对大型零件柔性作业车间调度问题,采用改进遗传算法优化元胞机局部演化规则,提出了元胞机和改进遗传算法相结合的混合调度算法。依据总加工时间最短、各工位负荷率高、同一工位组各工位负荷平衡率高的优化目标,建立了离散化后单个静态调度单元的遗传算法优化模型,并结合算例具体说明了优化过程。通过文献实例演算验证了混合算法求解大型零件柔性作业车间调度问题的可行性和有效性。
数控机床用直线电机伺服试验平台开发及应用
直线电机 数控机床 伺服系统 试验平台
2012/3/1
在分析数控机床用直线电机驱动伺服系统动态特性的基础上,概括了直线伺服系统抑制外部扰动、提高稳态精度、提高动态响应速率以及增强鲁棒性的先进控制策略,研制了数控机床用直线电机驱动伺服系统综合试验平台及其调试软件,最后,指出了直线电机在使用过程中其他一些值得关注的技术问题。
基于B样条的高频比动平衡机的永久标定实现
B样条插值 永久标定 动不平衡 状态标定
2012/3/1
提出了一种基于双三次B样条插值对刚性转子动不平衡测试系统进行系统标定的方法,该方法可以避免和减少硬支承动平衡测量系统中由于忽略了惯性力和系统阻尼带来的测量误差, 实现硬支承和软支承动平衡测量中系统的永久标定。在德国申克ST590平衡电测系统中采用0.5kg、1.6kg、5kg、16kg转子分别在180~1423r/min转速范围内进行标定实验,实验结果表明,该方法的标定结果与状态标定的标定结果具有...
Crystallographic Characteristic of Intermetallic Compounds in Al-Si-Mg Casting Alloys by Using Electron Backscatter Diffraction
Al-Si-Mg alloys intermetallic compound electron backscatter diffraction (EBSD)
2011/8/3
The Al-Si-Mg alloy which can be strengthened by heat treatment is widely applied to the key components of aerospace and aeronautics. Iron-rich intermetallic compounds are well known to be strongly inf...
Permeable Steel and Its Application in Plastic-Injection Mould
powder metallurgy permeable steel plastic-injection mould venting system
2011/8/3
The gas in plastics mould has great influence on performance, appearance and lifespan of the injection molded parts. Venting channel and its appendix system should be used for gas exhausting in genera...
Wheel-Rail Profiles Matching Design Considering Railway Track Parameters
wheel profile optimization dynamic behavior rail cant track gauge
2011/8/3
The profile of wheel/rail has great concern with the vehicle running safety, the wheel/rail wear and the rolling contact fatigue between wheel and rail, due to its severer impact on the dynamic behavi...
Key Technology of Embedded System Implementation for Software-based CNC System
software-based CNC system embedded system implementation
2011/8/3
The software-based computer numerical control(CNC) system includes three types of tasks, periodic real-time tasks, aperiodic real-time tasks, and non-real-time tasks. The tasks are characterized by co...
为了提高太阳能级硅材料放电切割的效率,基于理论建模的方法,将硅材料放电切割过程抽象为简单的二极管-电阻电路模型,在恒压源的作用下分析其放电电流特性.理论推导发现,影响回路电流的主要因素是放电端二极管及体电阻的作用,随着放电温度的升高,二极管雪崩压降增大,阻碍了电流流过,热传导作用体电阻减小,促进电流流过,综合作用后,放电电流呈现出两边高中间平缓的U型曲线.在电火花线切割机床上加工电阻率2. 1Ω·...
基于MATLAB的机床主轴优化设计
MATLAB 机床主轴 优化设计
2009/11/3
机械优化设计为工程设计提供了一种重要的科学设计方法．运用MATLAB优化工具箱，以最小质量和最小轴端位移为目标，对机床主轴进行优化设计，该设计方法简单、实用，主参数优化的结果合理、可靠．
GA based CNC turning center exploitation process parameters optimization
multi-objective optimization machining parameters genetic algorithm
2009/10/23
This paper presents machining parameters (turning process) optimization based on the use of artificial intelligence. To obtain greater efficiency and productivity of the machine tool, optimal cutting ...
THE VEINING STRUCTURE METHOD, THE FINITE ELEMENT METHOD IN THERMAL DEFORMATION DETERMINATION FOR THE MAIN SPINDLE AT NUMERICHAL CONTROL LATHES
finite element thermal deformation main spindle
2009/10/13
In the determination of the process accuracy on CNC lathe it is very important to know the thermal deformations. This article presents a new solution to obtain the thermal deformations at the principa...