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文中介绍的阻尼材料具有强度高、弹性模量低、减震性能好,且阻尼性能与环境温度的相关性小等优点。它不仅适合于制造车辆用减震器,而且还适合于建筑物抗地震用隔震器、减震壁等场合。 相似文献
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汽车前减震器用于汽车前桥与车身之间的减震。本工作探讨汽车前减震器用橡胶减震垫(结构如图1所示)的研制。 相似文献
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城市轨道交通工程在我国城市化的进程建设有着重要的意义,它关系到我国国计民生的市政工程建设。近些年来,随着对城市轨道交通工程的不断发展,与之相关的新设备、新技术、新理念也层出不穷。城市轨道交通工程技术不仅难度高,而且施工复杂,在工程建设中应用BIM技术,能够实现施工管理的精细化、信息化。本文以BIM技术为核心,探讨BIM技术在城市轨道交通项目设计阶段的主要应用。 相似文献
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本文主要对炭黑着色强度试验方法进行讨论。除了操作者的熟练程度、操作环境、药品的质量外,主要讨论着色强度试验使用的反射仪的校正。对着色强度的准确性进行了一些探讨性的对比试验,并且提出个人一些不成熟的见解。 相似文献
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文章通过总结分析问卷调查,分析了目前高职院校的城市轨道交通类专业英语教学的现状,从基于职业需求的人才培养角度出发,对城市轨道交通专业英语课堂教学模式的改革进行了探讨。 相似文献
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通过鸡胚绒毛尿囊膜试验(HET-CAM)研究几款无添加防腐剂与传统防腐剂的刺激性强度,并寻找能够降低刺激性的方法。用HET-CAM方法对9种防腐剂的刺激性进行检测,通过刺激评分(IS)法对无添加防腐剂和传统防腐剂进行测评发现,部分无添加防腐剂和传统防腐剂均存在刺激性。针对有刺激性的防腐剂,进行了改善性探讨,最终发现多种舒缓原料可以降低绝大部分防腐剂刺激性。 相似文献
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介绍了目前国内外涂膜附着力测定的通用试验方法及其技术特征,探讨了与其试验方法配套的多种测试仪器的应用性能。 相似文献
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漆膜的干燥性能非常重要.本文简要介绍了漆膜干燥时间的测定方法,包括表干时间、实干时间以及回黏性、无印痕和码垛性试验方法. 相似文献
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Michael Osterhold 《Progress in Organic Coatings》2000,40(1-4):131-137
In this paper the most important measuring methods for studying the rheological behaviour of modern paint systems will be presented (oscillation tests, determination of low yield points). In a first part the different methods were used to describe the rheological/physical properties of model polyurethane microgels. A second part deals with rheological investigations of effect development (light–dark flop) in waterborne pearlescent/coloured pigment systems. The measured values for storage modulus G′, phase shift δ and yield point were compared with flop-index values. The results show good correlations between the observable effect and the rheological parameters of the liquid paint. The third part presents measurements of powder and electrodeposition coatings and of clearcoats with the oscillation technique to determine the viscosity–temperature behaviour. The results were correlated with technical properties of the final films. 相似文献
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M. A. Soliman 《加拿大化工杂志》1979,57(5):643-647
This paper describes a version of Quasi-Newton methods for solving a set of non-linear algebraic equations. This method is simple, efficient, and requires little computer storage. This makes it suitable for the calculations of recycle streams in the simulation of chemical processes. Two examples are worked out to illustrate the good convergence of the present method as compared to commonly used methods. 相似文献
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《Computers & Chemical Engineering》2001,25(9-10):1299-1311
Rigorous techniques for consistent initialization of differential–algebraic systems (DAEs) are in general difficult to apply. Even worse, since initialization algorithms generally require the solution of a set of non-linear algebraic equations, they may not even converge. Hence, simpler approaches for initialization are of considerable interest in the numerical implementation of DAE models. In this contribution, it is proposed a simple and effective initialization technique, which is based on the assumption that the dynamic response of a mathematical model may be approximated by the response to discontinuous perturbations of a similar system, originally in steady state. Determining the analogous system and smoothening adequately those perturbations are the key aspects for the consistent initialization of the DAEs involved. The technique presented has been tested in several examples, always yielding encouraging results. 相似文献
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The approach to process monitoring known as multivariate statistical process control (MSPC) has developed as a distinct technology, closely related to the field of fault detection and isolation. A body of technical research and industrial applications indicate a unique applicability to complex large scale processes, but has paid relatively little attention to generic live process issues. In this paper, the impact of various classes of generic abnormality in the operation of continuous process plants on MSPC monitoring is investigated. It is shown how the effectiveness of the MSPC approach may be understood in terms of model and signal-based fault detection methods, and how the multivariate tools may be configured to maximise their effectiveness. 相似文献
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通过对断裂螺栓成分、拉伸强度、断口、受力的分析及现场测量数据,找出丙烯往复式压缩机缸头螺栓断裂原因,并提出预防措施。 相似文献
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介绍轮胎用纤维骨架材料性能的标准和非标准测试方法.重点从动态力学性能、耐疲劳性能和抗冲击性能3个方面对非标准方法进行介绍.纤维帘线耐疲劳性能的6种试验方法依次是Mallory胶管、U.S胶管、固特里奇盘形疲劳、费尔斯通压缩-屈挠疲劳、登录普疲劳和德里西亚屈挠疲劳试验方法. 相似文献