DQH轮主机第四缸活塞裙脱落事故的原因分析及修复措施

故障现象:DQH轮是1991年韩国大宇船厂制造的7万吨级散货船,主机型号为B&W6S50MC.1998年1月9日,该轮在中国北海海域航行,海况良好.正常运转中的主机透平突然出现剧烈喘振,曲拐箱油雾高浓度报警,主机驾驶台控制报警,主机自动应急减速,第四缸活塞冷却油无流量报警,扫气箱高温报警,透平出口高温报警,主机循环油柜低位报警.     

电动汽油泵常见故障的检查与排除

电动汽油泵具有操作简便、节约油料、利于行车安全等优点，被汽油车广泛采用。因此，了解掌握电动汽油泵常见故障的特征、产生原因和排除方法，会给检修带来很大方便。     

浅析热熔型道路标线常见质量缺陷产生原因及对策

结合历年来具体施工实践，较全面、系统地分析热熔型道路标线涂料特性及标线常见质量缺陷产生的原因，提出解决对策。     

传动轴螺栓脱落的危害、原因及对策

传动轴螺栓松落，可能使传动轴脱节掉落，将会导致翻车，影响交通安全，应当引起广大驾驶员，修理工的重视。     

浅谈混凝土装饰处理的实用措施

对混凝土装饰抹灰发生脱落的原因进行分析，提出防止抹灰脱落的相应措施。     

液力偶合器叶栅附面层及旋涡控制的试验研究

采用在液力偶合器叶片上打孔的方法，控制其内部附面层的发展、分离和旋涡的扩散，以提高偶合器的力矩系数。应用激光切面法测量叶片打孔前后的内部流场，并进行以比分析，得出了叶片上打孔的数量和孔径大小的最佳值。     

客车闸片脱落故障的分析及对策

通过对客车闸片运用故障和检修情况进行深入调查研究,从客车定检、运用维修、检修标准、配件材质等因素全面分析造成闸片脱落的原因,并为控制闸片脱落故障、消除配件脱落安全隐患提出了强化措施和建议。     

Periods and energy dissipations of a novel TLD rectangular tank with angle-adjustable baffles

A novel tuned liquid damper (TLD) rectangular tank with two angle-adjustable baffles was presented. The numerical analysis was performed using the commercial code FLUENT. The standard kinetic energy and dissipation rate turbulent model was employed, which was solved using volume of fluid (VOF) method able to treat both the free surface motion and the viscous stresses over the rigid walls accurately. The relationship between the natural periods of water and the angles of its baffles was studied by numerical sim- ulating of a case, and the changes of energy dissipations were investigated. The natural periods and dampers of the novel TLD can be changed in a wide range by adjusting the baffles' angle, thus it is more effective in controlling the vibration of structures in a wide frequency range.