故障诊断三巧招

巧招一用白纸诊断机油泄漏部位 一台杭发X6130型发动机，大修时更换了活塞、活塞环、气缸套及后气缸盖等主要零件，在热试时出现严重的排气管排机油的现象。     

接触网导线热过负荷保护的探讨

针对电气化铁道运行现状和铁路运输情况的变化,分析了目前电气化牵引变电所馈电线继电保护设置存在的不足,阐述了设置接触网导线热过负荷保护的必要性和保护原理,并结合国外过负荷保护装置的情况,提出了我国电气化铁道接触网导线热过负荷保护方案。     

电动汽车动力电池热失控过程分析及预警机制设计

文章通过实验数据对热失控发生的过程进行分析,提取出关键的信号特征。设计出一套全面完整的热失控预警系统,并总结出多个报警条件,避免出现故障的误报及漏报的情况。最后介绍了热失控预警后整车及大数据的应对措施。     

钢管混凝土拱桥主拱制造的若干问题

介绍钢管混凝土拱桥钢拱桁架的加工制造技术及工艺要点.着重介绍了主弦管的热煨弯技术,弦腹管拼装中相贯线的控制,焊接质量控制及在加工过程中易出现的几个问题.     

93耐热保健饮品对人体热耐受性的影响

９３耐热保健饮品对人体热耐受性的影响１何骁生２陈胜２许瑞娜３汤平涛２邬堂春２贺涵贞２为探讨９３耐热保健饮品对热耐力、免疫功能的影响，将健康男性大学生６名〔年龄２３岁～２５岁，体重（５８±５）ｋｇ〕采用实验对象受试前后自身对照。以不同时相分三组：①对照...     

解决汽车铝合金件焊接难的新方法——搅拌摩擦焊

搅拌摩擦焊简介搅拌摩擦焊是靠摩擦产生热量来进行焊接，所以节能显著，而且十分适用于异种金属焊接。搅拌摩擦焊的实质是在高速转旋的摩擦头上装一特殊形状的凸柱刺人工件面内，摩擦加热被焊金属成塑状态，同时搅拌金属形成一个旋转空洞，旋转空洞随摩擦头而前移，其后被挤出的塑性金属添入空洞，冷却后形成致密焊缝。这种方法突破了只能对焊杆或旋转面堆焊，可以焊对接焊、搭接焊、角接焊和点焊，因而可以在航空、汽车、铁道、车辆等工业中应用。例如，美国波音公司有搅拌摩擦焊专用车间生产大型焊接结构，     

Phase change analysis of an underwater glider propelled by the ocean＇s thermal energy

The phase change characteristic of the power source of an underwater glider propelled by the ocean＇s thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process, but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees, the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change, and the slope of the temperature time history curve remains the same. However, the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size, boundary conditions, and the power source＇s cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38ram needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.