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Configuration and Tension Variation in the Local Catenary Yarn Path

Journal of China Textile University(English Edition) 1998年第1期15卷 49-52页

作者：徐雷麟 China Textile Univ Shanghai China

For the local catenary path of yarn in steady motion fre-quently encountered in textile processing,this paper studiesthe mathematical expression of its geometrical configurationand tension variation,as well as the curve inclination angleand its maximum suspending *** final math-ematical equations and graphical curves are all presented indimensionless forms,as they are more general and universalthan dimensional expressions and *** the otherhand,we can also find out the catenary yarn tension fromexperimentally measured geometrical parameters by calcula-tions based on these graphs or mathematical expressions asgiven in the paper.

关键词： yarn tension catenary yarn path slop inclina-tion angle suspending deflection.

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Effect of Traffic Speed on Stresses and Strains in Asphalt Perpetual Pavement

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Journal of Civil Engineering and Architecture 2013年第8期7卷 956-963页

作者： Daba S. Gedafa Mustaque Hossain Stefan A. Romanoschi Department of Civil Engineering University of North Dakota Grand Forks ND 58202-8115 USA Department of Civil Engineering Kansas State University Manhattan KS 66506 USA Department of Civil Engineering University of Texas-Arlington Arlington TX 76019-0308 USA

Increasing traffic volumes and loads as well as public expectation for a long-lasting transportation infrastructure have necessitated designing perpetual pavements. The KDOT （Kansas Department of Transportation） conducted a field trial to investigate the suitability of perpetual pavement concept for Kansas highway pavements. The experiment involved construction of four thick pavement structures. To verify the approach of designing perpetual pavements on the basis of an endurance strain limit, the pavements were instrumented with gauges for measuring tensile strains at the bottom of asphalt base layers at various speeds. Pavements were also instrumented with pressure cells to measure stress on the top of subgrade. Pavement response measurements under known vehicle load were performed in August 2006. FWD （Falling-weight deflectometer） was also used to collect deflection.data at 15 m intervals on the same date. FWD first-sensor （center） deflection. were normalized and corrected to 20 ℃ temperature based on measured mid-depth pavement temperature. The result shows that strain and stress measurements show significant amount of variations. Measurements in the thickest section are the most consistent. The higher the traffic speed, the lower the strains and stresses. The difference between strains and stresses at 30 kmhar and 65 km/hr is higher than the difference between 65 km/hr and 95 kin/hr. This shows the effect of speed on stresses and strains decreases as the speed increases. Softer binder in the asphalt base layer results in lower strains, which confirms that softer binder results in higher fatigue life.

关键词： Traffic speed stress strain perpetual pavement deflection.

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Comparative Analysis of the deflection. of Two Beams Using the Finite Difference Method

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Journal of Mechanics Engineering and Automation 2020年第3期10卷 84-86页

作者： Mariana Coelho Portilho Bernardi Adilandri Mércio Lobeiro Rogério Zolin Bertechini Tamara Liz Schwab Ribeiro Academic Department of Civil Engineering Universidade Tecnológica Federal do ParanáCampo Mourão 87301-899Brazil Academic Department of Mathematics Universidade Tecnológica Federal do ParanáCampo Mourão 87301-899Brazil Academic Department of Informatics Universidade Tecnológica Federal do ParanáPonta Grossa 84017-220Brazil

In this paper,a comparative analysis of two beams’deflection.,one supported-embedded beam and a bi-supported beam,is *** such comparison,first the respective second-order linear Ordinary Differential Equations(ODEs)were *** with the boundary conditions,there are two Boundary Value Problems(BVPs),making it possible to perform their numerical and analytical *** numerical solutions,a Matlab algorithm was implemented based on the Finite Difference Method(FDM).The analytical solutions were also obtained for comparison with the numerical ones and with the validation *** the end we analyzed the shapes of the elastic lines of the two beams caused by the loads coming from the weight of each one.

关键词： FDM BVP ODE beams deflection.

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Effect of Various Additives on the Low Temperature Performance of Petroleum Based Asphalt Binders

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Journal of Traffic and Transportation Engineering 2020年第3期8卷 113-126页

作者： Ratnasamy Muniandy Fauzan Jakarni Salihudin Hassim Adedokun Oladimeji Department of Civil Engineering Universiti Putra MalaysiaSelangor 43200Malaysia

Transverse cracking is a prevalent problem that occurs in asphalt pavement binders in cold climates and diminishes the integrity of the road as well as shortens the life span of the road leading to premature *** specification for testing petroleum asphalt binders for transverse and low temperature cracking is not elaborate enough to accurately model the engineering behaviour of the ***,neat asphalt derived from petroleum crude oil does not seem to perform well at certain low temperatures without some modification to ***,a study was to be undertaken to determine the low temperature behaviour of 60-70 penetration neat binder modified with traditionally used materials such as Crushed Lime Stone Powder(CLP),Hydrated Lime(HL)and Cellulose Oil Palm Fiber(COPF)at temperatures 0°C,-5°C and-10°*** study was carried using the state of the art Bending Beam Rheometer(BBR)to assess the stiffness value,m-value and deflection.*** tests were performed in accordance with AASHTO T 313-12 *** results of the penetration,rotational viscosity and softening point showed that all of the modified binder specimens are within the required ***,the performance assessments on the modified petroleum binders with additive materials showed a varied nature with CL powder being the best and the COPF the *** was also observed that the crushed lime stone powder had an increase in stiffness,reduction in deflection.and m-value.

关键词： Asphalt binder additives BBR stiffness m-value deflection.

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