掺Sasobit~的温拌沥青混合料路用性能试验研究

温拌沥青混合料是一种节能环保型路面新材料,在室内对掺sasobit添加剂的温拌沥青混合料的路用性能与普通热拌沥青混合料进行了对比试验研究,结果显示：掺Sasobit的温拌沥青混合料的拌和与压实温度比普通热拌沥青混合料降低30℃时,具有与普通热拌沥青混合料相同甚至更好的路用性能,具有明显的经济和社会效益;拌和与压实温度的降低,混合料发生水损害的可能性会增加,建议采用添加抗剥落剂等方法来改善掺Sasobit的温拌沥青混合料的水稳定性;此外,Sasobit掺量过多会对混合料低温抗裂性能有不利影响。     

客车涂层表观质量的测量评估及工艺优化

主要介绍影响客车涂层表观质量的光泽、雾影、桔皮、鲜映性、颜色等指标的测试原理和相应测试仪器,并从工艺角度探讨如何改善涂层表观质量.     

不同海拔地区下增压中冷柴油机的性能研究

采用微机化大气模拟测控系统对增压中冷柴油机运行在不同海拔地区下的性能进行了大量的专题试验研究,分析比较了不同海拔下的增压中冷柴油机负荷特性、速度特性、万有特性及排放特性的关系。试验结果表明：随着海拔高度的升高,大气压力减小,导致吸入气缸内的空气量减少,缸内吸气终了的温度和压力下降,从而使得增压中冷柴油机的动力性、经济性下降,等有效燃油消耗区明显变窄。     

具有反馈检测功能的地铁列车开关门试验装置设计

传统地铁列车开关门试验装置,在试验过程中需工作人员确认地铁列车操纵台上的门全关指示灯是否点亮,检测效率较低.针对这种现状,设计一种具有反馈检测功能的地铁列车开关门试验装置.试验装置集成电路硬件以STM32F103C8T6型号的ARM芯片为控制核心,外围配置二极管、三极管、OLED12864显示屏、板载继电器和接线端子等...     

多功能海上重吊船LNG燃料应用分析

基于某多功能海上重吊船液化天然气（Liquefied Natural Gas，LNG）双燃料系统的设计，结合其典型运营工况，采用经济性（Economic Performance，EP）分析方法对LNG燃料和低硫船用轻质柴油（Low Sulfur Marine Gas Oil，LSMGO）燃料的能量消耗、额外初始投入成本、运营成本（Operating Expense，OPEX）等进行分析比较。结果表明，在满足设计要求的前提下，在中长期的船舶运维周期内，LNG燃料的EP更好。考虑未来船用清洁燃料的发展，相关研究可为海上工程作业船舶的燃料动力系统的设计和选择提供思路。     

Required test durations for converged short-term wave and impact extreme value statistics–Part 2: Deck box dataset

In the assessment of wave-in-deck loads for new and existing maritime structures typically model tests are carried out. To determine the most critical conditions and measure sufficient impact loads, a range of sea states and various seeds (realisations) for each sea state are tested. Based on these measurements, probability distributions can be derived and design loads determined. In air gap model testing usually only few, if any, impact loads occur per 3-hour seed. This can make it challenging to derive reliable probability distributions of the measured loads, especially when only a few seeds are generated. In addition wave impact forces, such as greenwater loading, slamming, or air gap impacts are typically strongly non-linear, resulting in a large variability of the measured loads. This results in the following questions: How many impacts are needed to derive a reliable distribution? How is the repeatability of individual events affecting the overall distribution? To answer these questions wave-in-deck model tests were carried out in 100 x 3-hour realisations of a 10,000 year North Sea sea state. The resulting probability distributions of the undisturbed wave measurements as well as the measured wave-in-deck loads are presented in this paper with focus on deriving the number of seeds and exposure durations required for a reliable estimate of design loads.The presented study is Part 2 of a combined study on guidance for the convergence and variability of wave crests and impact loading extreme values. The data set of Part 1 ([1]) is based on greenwater loads on a sailing ferry and the data set of Part 2 on wave-in-deck loads on a stationary deck box.