圆柱度和回转精度与导轨直线运动误差分离理论的研究

本文给出了移动三点法圆柱度误差分离的数学模型与求解方法.据此方法,只要拾取三传感器在一次安装下沿直行运动的输出信号,即可同时获得并准确分离工件的圆度、圆柱度误差与其径向、角向回转误差及测量架的直行运动误差.     

模糊神经网络预测电针镇痛中生化指标的变化

针对电针镇痛过程中生化指标化验的时滞性及费用高等不足,提出基于模糊神经网络预测电针镇痛过程中生化指标变化的方法.模糊神经网络的性能通过隶属函数的类型和隶属函数的个数优化.网络的训练数据来源于电针镇痛病人的心电图(ECG),脑电图(EEG)等生理电信号以及检测的生化指标.选取45个样本为训练样本,剩余的15个样本作为预测样本.模糊神经网络预测的结果与实际检测的结果非常吻合,从而为电针镇痛过程中生化指标变化预测提供了一种新的方法.     

Experimental Studies on Ultrasonic Vibration Grinding of the Workpiece Made from Fine-crystalline Zirconia Ceramics

The performances of fme-crystalline zirconia ceramics in workpiece ultrasonic vibration grinding （WUVG） and conventional grinding （CG） with diamond wheel were researched. The effects of WUVG and CG on material removal rate, grinding forces, surface roughness and microstructure of zirconia ceramic were investigated. Experimental results indicated that： （1） The material removal rate （MRR） in ultrasonic grinding process is two times as large as that of in conventional grinding. The material removal rate increases with increasing grinding depth in both ultrasonic grinding and conventional grinding. （2） The ultrasonic vibration grinding force is lower than that of conventional grinding force, and the increase of the worktable speed leads to a decrease of the grinding force, while the grinding force increases with larger grinding depth in both WUVG and CG. （3） The surface of ultrasonic vibration grinding has no spur and build-up edge and its surface roughness is smaller than that of CG significantly. Surface quality of WUVG is superior to that of conventional grinding, it is easy for ultrasonic vibration grinding that material removal mechanism is ductile grinding.     

三点法误差分离基本方程解的存在定理及其应用

70年代以来国内外出现用三点法误差分离原理解决高精圆度或高精轴系回转精度测试时将两者信息从测得的信号中分离的问题。过去用三角级数展开法、矩阵～平差理论法及泛函分析法对信号失真问题的解释均不尽满意,至今国内国外对三点法原理尚持不同意见。作者完成的下列工作可消释对三点法的疑虑。     

轿车车门装配夹具系统化调整的方法

为了定量地评价车门的间隙，采用系统化调节车门夹具的方法，研究轿车车门最佳安装以及获得车门最佳装配质量的系统化方法，为了准确定位，夹具调节方案既考虑到零件的几何特征，又考虑到定位器定位区域周围的几何特征，用实验验证了用于x向定位的车门边缘的建模，结果表明计算和测量尺寸之间具有一致性，从而表明了所提供的参数化建模方法、夹具系统化调节方案是正确的。     

离散傅立叶变换和复与实傅立叶级数的相互关系及其应用

本文在阐明与导出离散傅立叶变换、复傅立叶级数及实傅立叶级数三者关系的基础上推导出狭义采样定理,并给出它在圆度测量与评定中的应用实例。     

基于实验的翅片管换热器计算模型及其软件平台

在通过大量的实验获得修正系数的基础上，设计了一个通用的换热器计算模型和选型与设计检验的软件平台，其中通过引入新的计算方法，提高了收敛效果和计算速度，填补了国内翅片管换热器选型和设计检验软件方面的空白。2年的实际使用证明了该方法的有效性。     

Nonlinear Finite Element Analysis of the Structure of Door Seals

In order to evaluate the influence of the seal structure on door dosing force, nonlinear finite dement methed is introduced to analyze compression deformation of a door seal for SANTANA （name of the car made by Shanghai Volkswagen Co. Ltd）. MSC. Marc software is used to analyze the large deformation of the seal and the compression test is done to prove the computational results. The results show that the compression loads of the door seal are larger than the standard value of Shanghai Volkswagen Co. Ltd and the seal structure needs to be optimized. There are consistent relationships between calculating results and experimental results and the simulation method is effective.     

纳米复相陶瓷超声振动磨削表面微观特性

基于磨削表面几何和物理微观特性,对Al2O3-ZrO2纳米复相陶瓷二维超声振动磨削表面变质层进行了研究.AFM观测表明,二维超声振动磨削表层是以晶粒碎化的材料粉末化、少量的材料压碎和颗粒的脱落为主的塑性变形层,其表面粗糙度低于普通磨削表面粗糙度30%~40%.磨削表层和基体之间过渡层的X射线衍射峰具有半峰宽化现象,过渡层是以晶格畸变为主的塑性变形层,磨削表面无非晶相产生;在一定的磨削条件下,陶瓷材料纳米增韧改性和二维超声振动磨削技术相结合,可实现以非弹性变形为主要去除机理的超精密磨削表面.