《罐式集装箱容积》检定规程的制定

说明制定JJG（铁道）203—2010《罐式集装箱容积》的背景、主要依据和过程,介绍规程的适用范围、术语、计量性能要求、通用技术要求、计量器具控制、检定结果处理、检定周期等。     

制定我国铁路货车车钩疲劳试验标准的探讨

对照AAR车钩疲劳试验标准,探讨我国铁路货车车钩钩体和钩舌等的疲劳试验标准的制定方法;提出F型、FR型和16型、17型车钩分别在AARM-216:2009标准的要求模式以及国内1万t和2万t编组车辆试验载荷谱的模式下,进行交叉对比试验的构想。     

新型高摩擦系数合成闸瓦配方及工艺的研究

研究了配方及工艺对新型高摩擦系数合成闸瓦性能的影响。研究结果表明,当配方中的粘合剂含量为10%～16%,树脂与橡胶比例为1∶1～2∶1、纤维含量为20%～30%、填料中石墨和钾长石比例为45∶55～55∶45、压制压力为(3±2)MPa、压制温度为(160±10)℃时,可以制备出性能优异的新型高摩擦系数合成闸瓦。装车运用结果表明,新型高摩擦系数合成闸瓦可满足制动使用要求,解决了制动中出现的车轮掉渣、掉块和金属镶嵌等问题。在大秦铁路上已广泛运用。     

“摩托车和轻便摩托车辐条、条母”标准浅析

为规范我国摩托车编条式车轮用辐条、条母零件的技术规格,以作为确立技术指标的参照和设计摩托车辐条、条母的技术指南,编制了《摩托车和轻便摩托车辐条》、《摩托车和轻便摩托车条母》行业标准。     

对欧盟摩托车技术指令的解读

欧洲联盟是目前世界上发展最完善的汽车、摩托车一体化市场,欧盟政府制定发布了统一的汽车、摩托车技术指令,并依据这些指令对汽车、摩托车产品实施统一的型式批准制度,但在具体实施上,仍由欧盟各个成员国主管机关自行运作,这样势必造成不同的成员国对技术指令的解读和实施尺度上产生差异,为此欧盟各成员国主管机关定期召开协调会议,就技术指令的理解和实施统一认识。     

制修订摩托车减震器标准应尽快列入日程

当前我国摩托车减震器的发展比1993年出台第1代产品标准时相比已发生了重大变 化,沿用至今的标准已不能满足当前行业发展的要求。制修订摩托车减震器标准应尽快列入日程。     

An expeditious algebraic formulation to the buckling critical load of risers under dynamic compression

Dynamic compression of risers can play an important role in the structural stability of submerged pipes in catenary-like configuration. In this paper, the analytical formulation for the buckling critical load, developed in the early 2000's, is revisited and extended to cover a wider range of practical cases. A purely algebraic expression for the critical load is provided, eliminating the original formulation requirement related to solving transcendental equations, for both free and anchored risers. The analytic formulations and respective algebraic approximations are compared with numerical simulations, presenting a fairly good agreement. A discussion on the differences and similarities of each formulation ends this paper, highlighting their range of validity. Also, from the comparison, the analytical formulation developed in this work was more suitable for precise and fast determination of the critical buckling load for both riser types, rigid and flexible, and for most typical operating conditions. The proposed algebraic expressions were highly accurate and may substitute the previous analytical formulations for critical load prediction.     

国内外钢轨标准制修订回顾

介绍日本、美国、澳大利亚、俄罗斯等国家近10余年来钢轨标准的制定和修订情况。详细分析欧洲、美国等在钢轨的断面、钢种、钢中有害元素及非金属夹杂物指标方面发生的变化。重点阐述我国钢轨标准近年来的制定和修订过程,我国铁路用钢轨的标准体系及其与欧洲钢轨标准的不同点。从长期对国外钢轨标准跟踪研究中获得了有益的启示,提出构建我国钢轨及相关标准体系、钢轨轨头廓形优化、新钢种研发的一些建议。     

动车踏面清扫器研磨子的研制

确定研磨子性能测试的标准和条件,优化材料配方和压制工艺,研制动车踏面清扫器研磨子.研磨子以热塑性酚醛树脂和丁腈胶粉为粘合剂,以铁粉和铝矾土为填料,以钢纤维和无机矿物纤维为纤维,在压制压力为(3±2)MPa,压制温度为150～160℃下制成.通过力学性能、热重、强制磨耗等试验分析可知研磨子的性能:具有较高的冲击强度、硬度...     

Numerical weight function method for the structural analysis of ships: a speedy direct calculation with condensed structural information

The weight function method was originally derived for crack problems to calculate stress intensity factors for arbitrary loading conditions. In this article, a numerical weight function method has been extended to formulate the structural response analyses of two-dimensional elasticity, plate-bending, and three-dimensional plate-structures by using the finite-element method. The solution procedure is based on the well-known Maxwell–Betti reciprocal theorem, which is applied to the original and properly defined auxiliary problems. The present numerical weight function may be considered as a finite-element version of a Green’s function in an integral equation solution scheme. Although ship structures are certainly analysed by the finite-element method in a practical design procedure, the weight function approach has not yet been realized. The method is very useful for the analysis of structures subjected to a vast range of loading conditions, because structural responses can simply be calculated by the inner product of the universal weight function and load vectors. The validity and convergence characteristics of the present method are investigated by two-dimensional elastic and plate-bending problems, respectively. Finally, the method is applied to the calculation of the response amplitude operator of a stress component at a critical structural detail of a double-hull tanker, and the speed and efficiency of the method are quantitatively discussed based on the practical results.