共查询到20条相似文献,搜索用时 93 毫秒
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本文通过对某直升机燃油箱重力加油口易碎连接件的工作原理进行分析,利用有限元分析软件ANSYS对易碎连接件进行弹塑性变形分析,以此验证在重力加油口安装易碎连接件在燃油箱坠毁时可以保护油箱不被拉破,避免产生大量泄露,验证了其设计满足燃油系统适坠性要求。 相似文献
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随着科技发展,汽车安全性、轻量化及节能环保等性能指标变得尤为重要,汽车塑料燃油箱安全性能是汽车安全性能的关键因素。汽车塑料燃油箱检测方法在国家GB 18296—2001中有规定,燃油箱耐火性能检测是国家强制检验项目,试验中燃油箱夹具的设计尤为重要。文中按照国家标准规定对燃油箱耐火性能试验进行工作机理分析,充分考虑燃油箱在汽车上的安装状态及规格多样性等方面的问题,对燃油箱夹具进行设计,建立30~90 L的万能燃油箱夹具三维模型,并进行三维虚拟模拟及有限元分析,得到最优的设计模型,为实现针对不同规格燃油箱在耐火性能试验中模拟实车安装状态进行检测提供了坚实的保障。 相似文献
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<正>挖掘机燃油箱主要作用是存放燃油,同时还能起到沉淀燃油中杂质和对回油进行冷却散热的作用。本文对某批次液压挖掘机燃油箱底座开裂原因进行分析,并提出改进方法。1.故障现象某批次挖掘机工作1000h后,其燃油箱底座出现开裂和燃油渗漏故障。检查燃油箱外观,没有外力损害痕迹。检查更换下来漏油的燃油箱,发现其开裂部位多发生在底座端部(A、B处),如图1所示。其中A处开裂造成渗漏,B处开裂未出现渗漏。燃油箱发生开裂和燃油渗漏,不仅造成燃油 相似文献
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采用通气增压系统对飞机燃油箱内燃油上表面空气增压,可避免燃油箱内燃油高空沸腾、汽化。通气增压系统在研制过程中,必须进行地面模拟试验以验证飞机飞行过程中的通气增压性能。由于大气压力随高度变化而变化,燃油箱内空气压与环境大气压之间的相对气压也随飞行高度变化,因此在地面模拟试验时,如何模拟相对气压的变化成为试验的关键。提出了一种基于压力补偿的燃油箱通气增压地面模拟系统,在飞机爬升过程中对燃油箱充正压、在下滑过程中抽负压,以实现对燃油箱相对气压进行补偿。通过通气增压系统压力补偿的流量理论计算,求解燃油箱正压力补偿向燃油箱充入空气的流量和燃油箱负压力补偿向燃油箱抽出空气的流量。然后通过仿真研究燃油箱通气增压特性,得到全剖面过程中燃油箱增压压力变化情况。最后通过地面模拟试验,试验和仿真的油箱增压压力变化趋势一致,误差均小于5%,验证了燃油箱通气增压系统仿真结果可信、基于压力补偿的地面模拟试验方法正确有效。 相似文献
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《制造业自动化》2021,(9)
为了解决传统燃油箱设计成本高,生产周期长的问题,对一款轻型货车燃油箱制动工况下的变形与应力情况进行了有限元分析。首先通过Pro/E软件对燃油箱进行三维建模,利用workbench平台创建其有限元模型;而后对燃油箱进行了不同充液比的模态分析,获得了不同充液比下的固有频率;再对其进行了制动工况下静态结构强度分析,并采用VOF对其进行液体晃动仿真模拟,最后将液体晃动仿真模拟结果作为载荷输入对模型进行流固耦合求解,获得燃油箱的应力分布情况。研究结果表明:燃油的存在对燃油箱的固有频率具有较大影响,不可忽视;静态结构强度分析结果具有初期设计校核的意义;流固耦合分析后发现制动过程燃油箱所受最大应力小于屈服强度,符合设计要求,燃油箱损坏更多地体现为疲劳破坏。 相似文献
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船用锅炉是远洋运输船舶必备的辅助设备,主要用途是供应船舶燃油加热系统和日常生活所需的蒸汽.采用元器件计数法对某船用锅炉的前期设计进行了可靠性预计,并对锅炉整个结构设计进行了可靠性分析. 相似文献
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针对目前单缸柴油机由于没有安装副油箱或者油量指示装置,实用中因为没有及时给柴油机补充燃油而导致气堵现象发生,设计研究了农用柴油机自动提醒加油油箱,也就是在原有普通单缸柴油机油箱的基础上设计了浮子筒结构和控制装置。设计的控制装置采用普通6V电源单独供电、数字电路检测报警,在发动机还有一定量剩油的情况下,通过指示灯显示和蜂鸣器报警提醒用户及时补充燃油,并通过实验证明该装置能够满足需要。研究成果对农用柴油机油箱的设计也具有一定的指导意义。 相似文献
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Jong Pil Choi Young Ho Seo Byeong Hee Kim 《Journal of Mechanical Science and Technology》2011,25(4):931-935
This paper presents a simple and low-cost micro direct borohydride fuel cell (DBFC) using a mixture of a fuel (sodium borohydride, NaBH4) and a liquid electrolyte (potassium hydroxide, KOH) in order to improve three-phase contact in micro fuel cells. It consists of an anode, cathode, and a fuel chamber for the liquid mixture of the fuel and the electrolyte. For anode catalysts, gold (Au) was sputtered on a Pyrex® glass, and manganese dioxide supported on carbon (MnO2/C) was coated on nickel foam for cathode catalysts. The NaBH4 and 1 M KOH were used as the hydrogen source and electrolyte respectively. The DBFC has a simple configuration without auxiliary devices and is cost effective because a platinum catalyst and ion exchange membranes were not used. The size of the DBFC was 20 × 14 × 5 mm3, and the active area was 10 × 10 mm2. The DBFC showed a maximum power of 1.18 mW at 0.29 V, and three serially connected cells illuminated two LEDs for one hour without refueling and any auxiliary devices. 相似文献
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《风机技术》2021,(1)
The motivation to use air foil bearings in fuel cell compressors is driven by the demand for oil-free and high-power density system to reduce system volume and weight. The characteristics of air foil bearings that realize this demand are its independency on auxiliary system and no scheduled maintenance as well as their superb performance at high speeds. However, integration of the foil bearings to the compressor needs rigorous developmental tests for the bearing to withstand high g-load during vehicle maneuver and to remain stable in rotordynamics under external destabilizing forces. This paper presents multi-pads foil bearing technology applicable to single stage high speed fuel cell air compressors.Two different multi-pad air foil bearing designs(two-pad vs three-pad) were tested using a high-speed spin test rig to identify the differences in rotordynamics responses. The two-pad bearing is superior in rotordynamics without any sub-synchronous vibration while three-pad bearing provides more uniform load capacity in all directions with less rotordynamics stability. Frequency-domain modal analyses verify the experimental observations. Axial foil bearings with 38 mm outer diameter was designed and tested up to 140 krpm with load capacity of 90 N(1.4 bar specific load capacity).Finally, a platform design of single stage 15 k W fuel cell compressor with rated speed of 130 krpm is proposed using the multi-pad foil bearings and axial foil bearings developed through this paper. 相似文献
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《风机技术》2021,(4)
The motivation to use air foil bearings in fuel cell compressors is driven by the demand for oil-free and high-power density system to reduce system volume and weight. The characteristics of air foil bearings that realize this demand are its independency on auxiliary system and no scheduled maintenance as well as their superb performance at high speeds. However, integration of the foil bearings to the compressor needs rigorous developmental tests for the bearing to withstand high g-load during vehicle maneuver and to remain stable in rotordynamics under external destabilizing forces. This paper presents multi-pads foil bearing technology applicable to single stage high speed fuel cell air compressors.Two different multi-pad air foil bearing designs(two-pad vs three-pad) were tested using a high-speed spin test rig to identify the differences in rotordynamics responses. The two-pad bearing is superior in rotordynamics without any sub-synchronous vibration while three-pad bearing provides more uniform load capacity in all directions with less rotordynamics stability. Frequency-domain modal analyses verify the experimental observations. Axial foil bearings with38 mm outer diameter was designed and tested up to 140 krpm with load capacity of 90 N(1.4 bar specific load capacity).Finally, a platform design of single stage 15 k W fuel cell compressor with rated speed of 130 krpm is proposed using the multi-pad foil bearings and axial foil bearings developed through this paper. 相似文献
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