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文章结合具体典型问题,详细阐释了轿车行李箱盖水管理及相关防水设计.结构开发设计、CAE仿真模拟和防水测试实验结合,不仅阐释了各类水问题和排水的渠道,也提供了典型的漏水问题以及相应的解决方案.为行李箱盖漏水问题提供了解决的思路和设计参考. 相似文献
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昆仑山隧道渗漏水原因探讨及治理 总被引：6，自引：2，他引：6
通过现场连通试验,对青藏线昆仑山隧道渗漏水的水源、流径进行了试验研究。结果证明,造成渗漏水的主要原因是隧道结构周围存在融化圈,解冻后使衬砌外侧积聚承压水,在寒季冻结又产生巨大冻胀力,对隧道混凝土结构及防水板接缝产生破坏,形成出水通道;而且排水系统只能季节性排水。提出二号冲沟采取截、排、降,及延长冲沟地表帷幕注浆的范围,洞内水沟采暖,洞内回填注浆的治理方案。借助地质雷达等手段进行效果检测表明,治理达到了预期效果。 相似文献
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Choung Mook?LeeEmail author Dong Gi?Han Kwan Hyoung?Kang Sang Joon?Lee 《Journal of Marine Science and Technology》2004,8(3):117-125
The behavior of the flow passing a tandem oil fence, and the performance of the fence, were investigated by experimental and numerical methods. The flow characteristics between tandem fences were measured by the particle image velocimetry (PIV) method for the rigid and open free surface between the two fences in order to gather reference data for numerical investigations. A method of assessing a tandem fence by tracing the movement of an oil droplet around the fence is introduced. The effect of the current speed, the separation distance between the two fences, the relative draft of the two fences, and the water depth on the oil containment between the fences was investigated. 相似文献
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Previous studies have reported ultrafine particle (UFP) infiltration to the in-cabin microenvironment; however, no systematic measurements have been conducted showing where and under what conditions infiltration occurs. This study examined the automotive envelope leakage and UFP infiltration. We measured the differential pressures between the cabin and the potential leakage area on the surface of 11 passenger vehicles of different models/makers. To identify location of infiltration, UFP concentrations were concurrently measured inside and outside the vehicles as well as near the rear trunks. This study found that UFP infiltration primarily occurs through the rear trunk leakage under recirculation (RC) mode. Under RC mode, aerodynamic effects of a moving vehicle made the surface pressure on the side doors lower (i.e., exfiltration) than the cabin pressure, but higher (i.e., infiltration) on the rear trunk. The UFP concentrations measured near the rear trunks were 2–9 folds higher than inside vehicles. The magnitude of pressure differences increased at higher driving speeds. Under outdoor air (OA) mode, the infiltration was rarely observed because of the fan-controlled cabin pressurization. These data provide the first experimental evidence showing that UFP infiltration into passenger vehicles is location-specific and driving-speed-dependent. 相似文献
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阐述四端网络的基本计算方法,根据无绝缘轨道电路电气绝缘节的绝缘机理,对窜码的必然性进行了定性分析,并通过四端T型网络计算进行定量分析. 相似文献
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基于起重机钢丝绳滑轮疲劳试验台,运用钢丝绳的磁检测技术,研究了钢丝绳周向漏磁场强度随疲劳循环次数的变化规律,发现随着疲劳程度的增加,钢丝绳周向漏磁场强度逐渐增大,磁导率逐渐减小,且沿钢丝绳轴向长度的分布越来越不均匀.研究表明,可以通过分析磁化性质的变化判断钢丝绳的疲劳程度. 相似文献
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为解决铁路沿线山区、隧道等弱场环境中货车400 MHz列尾通信、工务人员语音通信不畅的问题,研究地面400 MHz数字通信中继系统。基于铁路DMR无线通信应用的原理和列车运行环境的特点,进行需求分析和功能设计,实现400 MHz数字货车列尾通信中继、数字对讲中继、隧道漏缆故障定位监测等功能,并通过现场试验进行了验证。试验结果表明：该系统能够提高货车列尾通信的可靠性,延长施工作业人员的对讲通话距离,降低漏缆维护作业的劳动强度。 相似文献