高速机床的交流直线电机进给驱动系统

针对交流永磁同步直线电机进给驱动系统和交流异步直线电机进给驱动系统两种典型零传动进给系统，阐述了直线电机进给驱动系统的总体结构、运行与控制原理，给出了其控制方法和驱动控制系统的实现方案。     

高架桥式龙门高速加工中心直线进给系统的设计

介绍一种高架桥式高速加工中心直线进给系统的设计。阐述了高速直线进给时所采用的直线电机驱动系统的外形,以及选择直线电机时需要考虑的主要参数和原则。给出了Y向直线进给的控制方案,并根据X向采用双直线进给电机的特点提出了提高同步精度的方案。     

基于PID控制的直线进给系统的仿真与试验

在数控机床永磁直线同步电动机基本结构及工作原理基础上,构建了直线进给系统物理模型及传递函数。根据工程设计方法设计直线进给系统的PID控制器,通过仿真分析验证了控制器的有效性,最后通过直线进给系统综合试验平台开展相关实验研究PI控制下直线进给系统的动态性能,并分析了主要控制参数对系统动态性能的影响。     

数控机床用直线电动机高速进给单元应用设计

分析了直线电动机用于机床进给系统的结构特点，针对非圆截面加工的特殊要求，设计了用于数控机床进给系统的直线电动机驱动部件。     

直线进给系统负载质量对伺服动刚度影响的研究

为了研究负载质量对直线进给系统伺服动刚度的影响,建立直线电动机进给系统控制模型,利用Matlab软件对模型进行仿真,分析负载质量对直线进给系统伺服动刚度的影响规律,并结合直线进给实验装置进行验证,在此基础上提出相应的改进措施。     

浅析直线电机在数控机床上的应用

直线电机能直接产生直线机械运动,而不需要中间传动转换装置,使机床结构简化,因而有着广泛的应用。文章主要介绍了数控机床采用直线电机进给系统的必要性、分析了其优缺点和应解决的关键技术问题,旨在推进直线电机进给系统在数控机床上的广泛应用。     

直线电机与高速精密数控机床进给系统的研究

直线电机直接驱动方式是一种高速精密加工进给系统的理想驱动方式。本文介绍了直线电机直接驱动的必要性，研究了直线电机高速精密进给系统的原理、单元组成和特点，并且给出了直线电机在数控车床上的应用实例。     

数控机床用直线电动机及其控制技术

直线电动机直接驱动系统具有结构简单、动态响应快、速度和加速度大等一系列优点,是各类数控机床进给运动的理想传动方式。介绍了直线电动机直接驱动技术原理、特点及其在数控机床中的应用,阐述了直线电动机直接驱动系统控制技术的研究现状及发展趋势。     

超高速数控机床进给系统的方案设计

高速进给系统是高速数控机床的主要组成部分之一。本文比较了高速进给系统各传动方案的优缺点，详细分析了直线电机在高速进给系统的优越性及我交高速进给系统的设计方案，这今后越高速机床的设计奠定了基础?     

直线电动机在磨床上应用的理论分析

指出了磨床的进给运动采用直线电动机驱动系统较之传统的滚珠丝杠形式具有一系列的优点.分析了摩擦力、磨削力、力波动对机床进给系统的影响.通过相关的物理学理论,建立了进给系统的动力学方程,在此基础上建立了摩擦力、磨削力、力波动的数学模犁,从而为进给系统数学模型作了基础性工作.该项研究为未来直线电动机驱动系统在磨床上的广泛应用具有指导性意义.     

直线电机监测系统的关键技术研究

直线电机的初始位置检测与旋转电机一样是实现电机精确控制的关键技术之一。利用绝对式光栅尺对直线电机进行初始定位不但可以省去常用的霍尔元件，而且还可以实现直线电机在任一位置的启动。对直线电机的位移和速度、绕组温度、电机推／拉力进行有效监测是保障其正常工作的前提，为此自主研发了对直线电机上述重要参数进行动态跟踪的监测系统。文中对该监测系统的设计方案、关键技术和具体的开发过程进行了详细的探讨。     

Influence of linear-axis error motions on simultaneous three-axis controlled motion accuracy defined in ISO 10791-6

Five-axis machine tools, which combine three linear axes and two rotary axes, are required for accuracy in machining complex shapes. In this paper, to clarify the influence of simultaneous three-axis control motion measurements as specified in ISO 10791-6, the measured results using a ball bar and R-test are compared. As the motion trajectories of the linear axes are not identical in both measurement devices, it is expected that the error motions of the linear axes cause different measurement results depending on the measurement devices. Thus, the squareness errors between the linear axes and the error motions of the linear axes are assumed as error factors that influence the measured results in this study. A mathematical model of a five-axis control machine tool that considers the error motions and squareness errors of the linear axis is constructed, and the influence of those error factors on motion accuracy is examined using an experiment and a simulation. As a result, the squareness errors and error motions of the linear axis are observed to greatly affect simultaneous three-axis controlled motion accuracy.     

直线伺服电机在精密驱动与定位平台中的应用

以安川直线伺服电机在表面缺陷视觉检测系统中的应用为例,介绍了多轴直线伺服电机在精密驱动与定位平台中的应用技术,分析了直线伺服电机和伺服驱动器的定位与运动性能,论述了安川直线伺服电机驱动系统运行的实现方法,包括系统的初始化、编写运动程序,将HMI、运动控制器和PC组成局域网,实现三者之间数据查看与修改,及远程控制多轴电机运行、查看实时运行情况和对报警进行处理等功能。     

Design and analysis of linear oscillating motor for linear pump application-magnetic field,dynamics and thermotics

A linear oscillating motor is an electromagnetic actuator that can achieve short-stroke reciprocating movement directly without auxiliary transmission mechanisms. It has been widely used in linear pump applications as the source of power and motion. However, because of the demand of high power density in a linear actuation system, the performance of linear oscillating motors has been the focus of studies and deserves further research for high power density. In this paper, a general framework of linear oscillating motor design and optimization is addressed in detail, including the electromagnetic, dynamics, and thermal aspects. First, the electromagnetic and dynamics characteristics are modeled to reveal the principle for optimization. Then, optimization and analysis on magnetic structure, resonant system, and thermal features are conducted, which provide the foundation for prototype development. Finally, experimental results are provided for validation. As a whole, this process offers complete guidance for high power density linear oscillating motors in linear pump applications.     

Determination of spectral densities of dynamic characteristics of a nonlinear model of structure

A stochastic problem of the dynamics of a nonlinear model of structure is considered. The problem is solved with the use of an expansion of the solution in the truncated orthogonal basis of eigenvectors of the linear model. It is assumed that nonlinearities of the system do not result in a fundamental change in its dynamical behavior, but contribute a significant quantitative correction relative to the linear model. The nonlinear characteristics are statistically linearized. The coefficients of statistical linearization are formally interpreted as some variations in the corresponding elements of the stiffness matrix of the linear model. Spectral densities, displacement variances of the linearized system, as well as its eigenvalues and eigenvectors, are represented as a power series expansion in the above variations considering linear or square approximations. To find the coefficients in the expansion, the sensitivity theory is used. This allows one to form a set of algebraic transcendental equations in displacement variances, which is solved by the method of successive approximations. Then all the target spectral densities are found. The results are illustrated by examples.     

直线电机力学系统的计算与分析

通过建立直线电机的受力模型,推出直线电机的推力和功率计算公式,得出最大速度和加速度公式,解决了保证在一定的功率储备的前提下,使直线电机的推动力、进给速度和加速度满足高速机床的要求等问题,在直线电机的设计和制造中具有借鉴意义。     

可变带宽FIR数字滤波器的高效加权最小二乘设计及实现

本文提出一种具有稳定相频响应的可变带宽FIR数字滤波器的高效加权最小二乘设计方法.文中将可变带宽FIR数字滤波器的冲击响应表示成以谱参数为变量的基函数的线性组合,进而利用定系数子滤波器的线性组合来实现,这里可变带宽特性直接由可变谱参数所决定.该方法通过建立加权最小二乘目标函数,简单高效地推导出滤波器系数的优化封闭解表达式,复杂度和计算量大大降低.应用这种滤波器的优点在于只有一个直接决定带宽的可调谱参数,更新机制简单.设计实例证明了该方法的高效性和可变带宽滤波器的有效性.     

基于GPS的线性尺寸计量认证技术研究

基于对新一代GPS（dimensional geometrical product specification and verification）线性尺寸规范及其数字化理论基础的分析,揭示并阐明新一代GPS线性尺寸规范以产品功能特征为中心、以“规范设计”与“计量认证”统一为原则、以计量数学为基础的规范思路及内在规律性;基于计量学和操作技术,给出线性尺寸计量认证中、实现实体计量系统与虚拟计量技术互补的思路与方法,并进一步建立其线性尺寸数字化计量认证的关键操作——拟合的数学描述及线性规划模型,开发出线性尺寸数字化计量认证（软件工具）系统;并在此基础上,进一步给出基于GPS数字化技术的虚拟综合量规设计与应用方法,以满足产品特定的功能要求;并通过实例说明其工程价值及技术经济意义。     

由特征压力识别轴承油膜力的算法及软件

由特征压力识别轴承油膜力的技术在旋转机械状态监测及故障诊断中越来越受到重视。在实践基础上,提出了一套包含线性和非线性映射关系的油膜力识别算法,该算法包括直接解法和拟合公式法。直接解法直接利用特征压力和轴承油膜力之间的关系曲线,也就是参数间的映射是非线性的;而拟合公式法中包含用线性函数表征的在一定范围内适用的参数间的线性映射。鉴于工程中分析轴承-转子系统动态行为主要运用线性动力学理论,因而上述线性映射算法构成的识别技术易于与现有技术相融合。根据特征压力识别轴承油膜力的算法编制了相关软件,并成功用于多个电厂的轴承负荷识别、轴系稳定性分析和疑难故障诊断。     

Straightness and flatness tolerance evaluation: an optimization approach

This paper presents an optimization approach that could be used to calculate exact values of straightness and flatness errors as defined by the ANSI Y14.5M standards on geometric dimensioning and tolerancing. The straightness and flatness error evaluation problems are formulated as nonlinear optimization problems with linear objective function and nonlinear constraints. Because of the special structure of the problem, a linear search method is developed that reduces the nonlinear problem to a linear programming problem with only two constraints. Examples are presented to compare the optimization approach with the least-squares method and some exact methods. The results show that the optimization procedures presented in this paper provide exact values of straightness and flatness errors and are superior to the existing methods in terms of computation time.