共查询到20条相似文献，搜索用时 296 毫秒
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炼油厂许多主蒸汽管线 ,直经和质量较大 ,管线在管架上常被拉裂。针对该问题设计的滑动管托 ,解决了这一难题 相似文献
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李佳琳 《中国石油大学胜利学院学报》2021,(2):29-33
冷却器管嘴受到来自管线的应力和力矩,利用CAESARⅡ对焦化粗汽油冷却器管线进行应力分析,结果表明:在空间受限无法调整管线路由的情况下,无法通过添加π型弯等常规手段增加管道柔性,而选择合适的弹簧,可减小管线热位移对设备管嘴受力的影响,从而保证设备的安全运行.管道设计时,应考虑提高管道固有频率,避免出现因外力引起的共震现... 相似文献
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朱善瑜 《胜利油田师范专科学校学报》2014,(4):23-25
海底管线在铺设过程中受海上施工环境限制较大,尤其是浅滩区域。合理地组织施工方案,保证海底管线的施工质量极其重要。以月东油田B岛-登陆点海底管线铺设为例,从铺管方法、施工方案和工程后处理等方面详细研究了海底管线在浅滩区和浅水区的不同施工方法,为同类工程提供可借鉴的施工经验。 相似文献
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《实验室研究与探索》2016,(9):4-9
针对耙吸式挖泥船动力定位系统,以某8 000 m~3耙吸式挖泥船为研究对象,分析其动力定位系统在模拟海况下的定位能力与特点,构建出动力定位时域模型。对挖泥船在各种海况下的实时运动进行时域模拟分析,得到该挖泥船的偏移半径时历和功率消耗时历,并进行相关模型试验。时域模拟与模型试验结果表明,该挖泥船动力定位系统仅可在较小艏向角范围内完成有效定位,由于舵转角的限制,螺旋桨无法在较大艏向角的情况下提供足够的转船力矩完成定位。通过模型试验与时域模拟结果的分析与比较,为动力定位时域模拟程序进一步优化提供参考。 相似文献
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文章分析了液压抓斗式挖泥船在水利工程中的应用,主要介绍了液压抓斗式挖泥船生产技术指标、施工方法,从实用的角度介绍了在水利工程施工中,河道疏浚工程特殊工况条件下施工的优越性和先进性。 相似文献
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屈原《涉江》中有这么一句:“淹回水而凝滞”。对其中的“回水”课本上是这样注释的:“回水:回旋的水流。”但这经不起推敲。既然是回旋的水流,其流速是大的,因此,水流不会凝滞,船也不会凝滞,更 相似文献
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王新奇 《西安文理学院学报》2010,13(1):73-75
通过野外水流试验,研究了植物坝坝前壅水以及对水流流态的影响．结果表明,沟道柔性坝系普遍发生了淤积,引起上游水位壅高,水流流速减小．减缓了沟道土壤水分蒸发,增大土壤入渗,达到拦沙保水的目的． 相似文献
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王庆学 《北京工业职业技术学院学报》2005,4(3):22-24
沉管灌注桩施工中桩径的控制是保证其质量的重要因素.通过对沉管内砼体的受力分析,并用2个工程实例,探讨了管内砼柱面的相对高度在一定的条件下对充盈系数的影响,认为不仅提管时间和机械原因能影响灌注桩桩径(即充盈系数)的大小,而且选用不同的加灰频率、严格控制管内砼柱面的相对高度,也明显地影响充盈系数的大小,其对保证灌注桩的施工质量,提高经济效益具有重要的意义. 相似文献
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This paper describes a novel design for the carrier mechanism of a pipe-inspection micro robot. Based on this mechanism, a new
micro robot for the pipes with diameter of 20mm has been developed. It can travel through both vertical pipes and curved pipes to make
possible inspection that would be difficult with conventional endoscopes. This mechanism is composed of three units, two novel micro
mechanisms called as a planetary wheel mechanism for robot drive, two micro electromagnetic motors and a flexible coupler. 相似文献
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Hua ZHU Bo ZHUAN Jin-jun TAN Rong-hua HONG 《浙江大学学报(A卷英文版)》2008,9(3):410-415
This paper focuses on the heat transfer performance of semi-open heat pipe which is a new type of heat pipe. After analyzing its condensation heat transfer mechanisms theoretically, several semi-open heat pipes in different length ratios and upper hole diameters are studied experimentally and compared with the same dimensions closed heat pipes. Experimental results show that the heat transfer performance of semi-open heat pipe becomes better by increasing heat transfer rate. At the first transitional point, the heat transfer performance of semi-open heat pipe approaches the level of the closed heat pipe. It is suitable to choose upper small hole about 1 mm in diameter and length ratio larger than 0.6 for the semi-open heat pipe. 相似文献
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目前国内污水处理项目价格调整方法没有充分起到对水资源供需关系的调控作用。文章结合项目处理关系的动力费、当地在岗职工收入等因素,设计出污水、回水成本调价公式,构建城市供水、污水处理、管网配套、回水回用费用间合理的比价关系,对水资源供需关系进行科学调控,形成有效的环保价格激励机制。 相似文献
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Pressure pipes are widely used in modern industry with some in potentially dangerous situations of explosion and impact. The security problems of these pipes when subjected to impact have attracted a lot of attention. A non-linear numerical model has therefore been developed to investigate the dynamic behavior of pressure pipes subjected to high-velocity impact. A high strain rate effect on the pipe response is considered here and the fluid and pipe interaction is modeled to include the coupling effect between the deformation of the pipe and its internal pressure. Low-velocity and high-velocity impact experimental results are used to verify the numerical model, and a reasonable agreement between the numerical and experimental results has been achieved. The effects on the dynamic behavior of the pipes of the nose shape of the projectile, the diameter of the spherical projectile, and the pipe wall thickness and internal pressure, are investigated quantitatively. During high-velocity impacts, the increase of pressure in the pipes decreases their resistance to perforation. A rise in internal pressure increases the elastic resistance of the pipes toward impacts without crack formation. 相似文献
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Simulation investigation on fluid characteristics of the water hydraulic jet pipe servo valve (WHJPSV) is conducted through a commercial computational fluid dynamics (CFD) software package FLUENT. In particular, the factors to fluid characteristics of WHJPSV are addressed, which include diameter combination of jet pipe and receiver pipe, jet pipe nozzle clearance, angle between two jet receiver pipes and deflection angle of the jet pipe. It is concluded from the results that: (i) Structural parameters have ... 相似文献