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SMA沥青路面现场热再生试验研究 总被引:1,自引:0,他引:1
首先针对SMA沥青混合料现场热再生技术进行了室内试验研究,然后通过现场铺筑试验路对SMA现场再生混合料的性能进行了验证,通过试验研究发现,再生后的SMA沥青混合料具有较好的路用性能。 相似文献
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Sh. Lajqi J. Gugler N. Lajqi A. Shala R. Likaj 《International Journal of Automotive Technology》2012,13(4):615-621
Currently, as well as in the past, researchers have shown great interest in developing suspension systems for vehicles and especially in the design and optimization of the suspension parameters, such as the stiffness and the damping coefficient. These parameters are considered to be important factors that have an influence on safety and improve the comfort of the passengers in the vehicle. This paper describes a simplified methodology to determine, in a quick manner, the suspension parameters for different types of passenger cars equipped with passive suspension systems. Currently, different types of passenger cars are produced with different types of suspension systems. Finding a simplified methodology to determine these parameters with sufficient accuracy would contribute a simplified and quick method to the inspection of the working conditions of a suspension system. Therefore, a simple system to determine these parameters is needed. An analysis of the suspension parameters is performed using mathematical modeling and numerical analysis conducted using the Working Model software. The result derived from the developed methodology shows small errors when compared with the generic values, and it can be concluded that the design of the suspension parameter measurement device using the developed methodology is useful, simple, and has sufficient accuracy. 相似文献
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自行车共享交通系统提高了自行车的利用率,可改善城市交通出行结构,缓解交通拥挤,减少交通污染,有利于低碳高品质城市的实现和城市交通可持续发展战略的实施。在对自行车共享交通系统及其国内外发展历程、现状分析研究的基础上,指出现状条件下自行车共享交通系统的具体实施障碍,并为我国自行车共享交通系统的发展提供相关建议。 相似文献
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Matin Sh. Sichani Roger Enblom Mats Berg 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2016,54(6):748-764
In most rail vehicle dynamics simulation packages, tangential solution of the wheel–rail contact is gained by means of Kalker's FASTSIM algorithm. While 5–25% error is expected for creep force estimation, the errors of shear stress distribution, needed for wheel–rail damage analysis, may rise above 30% due to the parabolic traction bound. Therefore, a novel algorithm named FaStrip is proposed as an alternative to FASTSIM. It is based on the strip theory which extends the two-dimensional rolling contact solution to three-dimensional contacts. To form FaStrip, the original strip theory is amended to obtain accurate estimations for any contact ellipse size and it is combined by a numerical algorithm to handle spin. The comparison between the two algorithms shows that using FaStrip improves the accuracy of the estimated shear stress distribution and the creep force estimation in all studied cases. In combined lateral creepage and spin cases, for instance, the error in force estimation reduces from 18% to less than 2%. The estimation of the slip velocities in the slip zone, needed for wear analysis, is also studied. Since FaStrip is as fast as FASTSIM, it can be an alternative for tangential solution of the wheel–rail contact in simulation packages. 相似文献
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Saeed Hossein-Nia Matin Sh. Sichani Sebastian Stichel Carlos Casanueva 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2018,56(7):1051-1071
In this article, a wheel life prediction model considering wear and rolling contact fatigue (RCF) is developed and applied to a heavy-haul locomotive. For wear calculations, a methodology based on Archard's wear calculation theory is used. The simulated wear depth is compared with profile measurements within 100,000?km. For RCF, a shakedown-based theory is applied locally, using the FaStrip algorithm to estimate the tangential stresses instead of FASTSIM. The differences between the two algorithms on damage prediction models are studied. The running distance between the two reprofiling due to RCF is estimated based on a Wöhler-like relationship developed from laboratory test results from the literature and the Palmgren-Miner rule. The simulated crack locations and their angles are compared with a five-year field study. Calculations to study the effects of electro-dynamic braking, track gauge, harder wheel material and the increase of axle load on the wheel life are also carried out. 相似文献