专用大型车轮动平衡机研制

车轮动平衡机是检测轮胎质量分布的绍了车轮动平衡机的结构原理、支承系统的特点,重点分析影响平衡精度的关键因素-弹性元件,同时阐述了电测系统,并对系统软件进行设计.     

专用大型车轮动平衡机研制

车轮动平衡机是检测轮胎质量分布的关键设备,车轮动平衡技术是制约汽车工业发展的关键技术之一。本文介绍了车轮动平衡机的结构原理、支承系统的特点,重点分析影响平衡精度的关键因素-弹性元件,同时阐述了电测系统,并对系统软件进行设计。     

动平衡机及其计量特性

针对动平衡机迅速发展及质量管理存在的问题，通过对其工作原理的分析，探讨了动平衡机的计量特性和其量值的溯源性。     

浅议医用CT机计量检定规程

目前,医用ＣＴ机的国家计量检定规程准备通过专家审定和国家质量技术监督局批准实施。但是医用ＣＴ机的省级地方计量检定规程,已在河南、河北、山东等十几个省、市、自治区批准实施。这些规程在检定项目的设置、检定方法、技术要求和编写方法上有很大差别。如何处理这些问题,使之真实地反映出ＣＴ机的诊断性能,本文仅介绍河南的观点,抛砖引玉,使国家计量检定规程起草得更科学、更完善、更具操作性。１检定项目的设置应全面、完整。检定项目除水ＣＴ值的均匀性、ＣＴ值线性、密度分辨力、空间分辨力、图像噪声、剂量指数、层厚、定位灯准确度…     

曲轴动平衡机的能力验证

基于动平衡机的技术特点,提出了一种科学、合理的评定方法：能力验证,介绍了这种方法的原理和实施过程,并就新设备验收和在用设备周期校准等各种情况,对操作流程、分析方法、数据处理和评价指标等诸多方面作了具体描述。     

硬支承动平衡机常见故障分析及其排除

本文分析了引起硬支承动平衡机故障的因素，并阐述了故障的排除方法。     

车轮动平衡机的测量原理及其计量校准

本文主要叙述车轮动平衡机在汽车行业的重要性,它的测量原理,必要的计量性能、校准（测量）方法及不确定度分析。     

包装机横封机构平衡问题的研究

就某包装机的横封机构进行了平衡问题的探讨 ,求出惯性力及惯性力偶 ,指出了使其平衡的方法     

Elastoplastic Equilibrium of a Composition Containing an Elastic High-Modulus Inclusion

We pose and solve a two-dimensional model elastoplastic problem for a body containing a high-modulus elastic inclusion. Plasticity zones develop in the vicinity of the tips of the inclusion along its boundary. The problem is reduced to the solution of a singular integro-differential equation, which, in turn, is reduced to an infinite system of equations. The influence of the compliance of the inclusion on the sizes of the plasticity zones is analyzed.     

混凝土回弹仪弹击拉簧检定装置检定混凝土回弹仪弹击拉簧刚度测量不确定度分析

分析了用混凝土回弹仪弹击拉簧检定装置检定混凝土回弹仪弹击拉簧刚度的标准不确定来源,并对引入的每项不确定度分量进行了评定,最后求出合成标准不确定度和扩展不确定度。     

工程图学考试方法改革

考试方法是教学方法的重要组成部分。在规范面上考试、深化点上考试的指导思想下,提出了多种模式相结合的新的考试方法,即大批量的统一考试模式,基于平时成绩的面试免笔试模式,结构表达小设计和小论文的加分模式,学生自主命题、自我测试、自行评价“三自”模式等,“三自”模式仍然是统一考试与自由发挥的有机结合。最后通过成绩评定模式的改革以分数形式反映出考试成绩。     

Investigation of Algebraic Multigrid Method for Magnetic Field Analysis of an Electric Machine With a Laminated Core

In this paper, we describe the applicability of Algebraic Multigrid Method (AMG method) as a fast solution for magnetic field analysis of an electric machine with a laminated core. In an experimental analysis, we have found that there are some cases where the calculation speed can be improved by using the AMG method for a fine mesh that models a laminated iron core exactly. Therefore we investigated the convergence characteristic of the standard Incomplete Cholesky Conjugate Gradient method (standard ICCG method) and the Conjugate Gradient method preconditioned with AMG method (AMGCG method) for the simple and actual analysis models. The numerical results show that the AMGCG method provides fast solutions for laminated mesh models for which the standard ICCG method does not work well in many analysis cases.      

Equilibrium of a tip weighted curved sheet on an inclined plane

Summary One end of a long, naturally curved elastic sheet is clamped onto an inclined plane. The other end is acted on by a constant vertical force which tends to open the curved sheet. This nonlinear large deflection problem is studied by series perturbation, numerical integration and exact analytic solution. The occurrence of roll-up depends on the angle of the inclined plane an a nondimensional parameter representing the importance of curvature and flexural rigidity to that of the end load.With 6 Figures     

电气工程的检验与试验方法

根据国家颁布的《建筑电气工程施工质量验收规范》GB50303—2002，本文介绍了电气工程中材料的检验、试验与施工中检验、试验的内容与方法。     

微纳坐标测量机间接校准方法的探究

针对微纳坐标测量机的高精度性能指标无法精确校准的问题,提出了一种间接校准的方案。使用量块及标准球板校准微纳坐标测量机的尺寸测量示值误差,用标准球校准仪器的探测误差。并对中国计量科学研究院的微纳坐标测量机进行了校准实验,实验结果表明,该仪器的尺寸测量示值误小于0.2μm,探测误差仅为0.125μm,校准结果均优于仪器的最大允许误差,验证了校准方案的合理可行性。     

Synthesis of New Metastable Aluminum-Titanium Alloy by Defying Equilibrium in an Equilibrium Process

In this article, the synthesis of a newer generation of metastable aluminum- titanium (Al-Ti) materials is presented and discussed. Two equilibrium processing methods, using disintegrated melt deposition, were chosen and tried. The first restricted the interaction time between powders of titanium and molten aluminum, whereas the second essentially involved a change in surface characteristics of titanium powders prior to their addition to molten aluminum. The results of microstructural characterization and X-ray diffraction studies conducted on the Al-Ti materials, synthesized using the two methods, reveal the presence of elemental titanium and other phases in the aluminum matrix, thereby providing confirmation as to the metastable nature of these materials. Results also indicate that a significantly higher amount of titanium can be retained in the metal matrix at low processing temperatures when compared with predictions of the equilibrium Al-Ti phase diagram. Results of this study provide an innovative, viable, and cost-effective approach to synthesize metastable materials for both scientific and engineering applications.