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.     

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.     

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。     

圆度评定实用软件及有关问题

圆度评定实用软件及有关问题朱训生，刘国良，沈德和，薛秉源（机械工程系）近年，在圆度仪上配置微机并将所测得数据按数学模型实时评定等问题已引起各方注意．如１９８０年出现了近似线性模型［１］，８０年代中期作者及国内外多个单位各自给出了严格符合定义的精确数学...     

三点法误差分离测试数据有效性的两个必要条件及其应用

工业先进国家如德、英、苏、美等使用三点法测圆已有半个世纪。人们在实践中已认识到传统的三点法测得的轮廓曲线形状失真甚大。70年代初日本大圆成夫等学者借助气动量仪测得数据用傅里叶级数处理,提出误差分离技术(EST),曾取得重大突破,但由     

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.     

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。     

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。