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Experimental study on integral axial squeeze film damper to suppress longitudinal vibration of propulsion shafting 认领
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作者 范文强 He Lidong +3 位作者 Jia Xingyun Yan Wei Zhu Gang Wang Jian 《高技术通讯:英文版》 EI CAS 2021年第1期76-85,共10页
This paper aims at investigating the effectiveness of squeeze oil film in suppressing the longitudinal vibration of propulsion shaft systems through a novel integral axial squeeze film damper(IASFD).After designing th... This paper aims at investigating the effectiveness of squeeze oil film in suppressing the longitudinal vibration of propulsion shaft systems through a novel integral axial squeeze film damper(IASFD).After designing the IASFD,a propulsion shafting test rig for the longitudinal vibration control is built.Longitudinal vibration control experiments of the propulsion shafting are carried out under different magnitude and frequency of the excitation force.The results show that both IASFD elastic support and IASFD elastic damping support have excellent vibration attenuation characteristics,and can effectively suppress the longitudinal vibration of the shaft system in a wide frequency range.However,IASFD elastic damping support has a more significant vibration reduction effect than the other supports,and increasing the damping of the system has obvious effect on reducing the shafting vibration.For an excitation force of 45 N,the maximum reduction of the vibration amplitude is 89.16%.Also,the vibration generated by the resonance phenomenon is also significantly reduced. 展开更多
关键词 integral axial squeeze film damper(IASFD) propulsion shafting longitudinal vibration vibration damping
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Experimental study of suppressing the unbalanced response vibration of rotor system with a G-type integral squeeze film damper 认领
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作者 闫伟 He Lidong +2 位作者 Zhang Yufei Zhang Yipeng Jia Xingyun 《高技术通讯:英文版》 EI CAS 2021年第1期1-9,共9页
Conventional squeeze film dampers have numerous challenges including lock up,bistable response and incoordinate precession.In order to resolve these nonlinear problems,a novel G-type integral squeeze film damper(GISFD... Conventional squeeze film dampers have numerous challenges including lock up,bistable response and incoordinate precession.In order to resolve these nonlinear problems,a novel G-type integral squeeze film damper(GISFD)is proposed in this research.The experimental test rig is provided to investigate the rotor system with an unbalanced single disk.Numerical simulation results show that the structural design of GISFD is reasonable,which can ensure its safe and stable operation.The influence of different support stiffnesses on the first-order speed of the rotor system is analyzed.Experimental results show that GISFD can effectively suppress the unbalanced response vibration of the rotor.In a certain range,it is found that the suppression effect of GISFD increases with the increase in the kinematic viscosity of the damping fluid.When the silicone oil with kinematic viscosity coefficients v=30.0 cm2/s is employed,the vibration reduction of GISFD is approximately 71.51%.Furthermore,the experimental results show that with the increase of the unbalance,there is a linear relationship between the unbalance and the corresponding amplitude of the unbalanced response.It is concluded that GISFD has excellent linear damping characteristics and reduces the sensitivity of the rotor system to the unbalanced mass. 展开更多
关键词 G-type integral squeeze film damper(GISFD) unbalanced response vibration suppression rotor system dynamic characteristic
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湿压缩过程中水滴的运动分析 认领 被引量:2
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作者 柴柏青 徐国印 +3 位作者 郑群 张海 贾兴运 田志涛 《哈尔滨工程大学学报》 EI CAS CSCD 北大核心 2017年第2期222-229,共8页
湿压缩过程中水滴的喷入对压气机性能具有显著影响。为了研究水滴在压气机内的运动情况,对单级轴流压气机的湿压缩过程进行了数值分析。结果表明,水滴在压气机内主要受气流拖拽力的作用,雷诺数与韦伯数整体较小,发生振荡破碎的可能性较... 湿压缩过程中水滴的喷入对压气机性能具有显著影响。为了研究水滴在压气机内的运动情况,对单级轴流压气机的湿压缩过程进行了数值分析。结果表明,水滴在压气机内主要受气流拖拽力的作用,雷诺数与韦伯数整体较小,发生振荡破碎的可能性较大,并且集中于转子叶前缘附近;湿压缩过程中会有水滴撞击叶片,不仅对水滴的运动破碎产生影响,还会造成叶片的附加载荷;较小的水滴颗粒传热传质效果较好,湍流波动强度较弱,对气流造成的粘性损失较小。所以,湿压缩效果需要综合考虑水滴产生的蒸发冷却、阻力损失与撞击作用的影响,选取较小的水滴颗粒和适当的喷雾量。 展开更多
关键词 水滴运动 湿压缩 两相流 传热传质 压气机
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锐钛矿型TiO_2/ZnO纳米复合颗粒的制备及光学性能研究 认领 被引量:2
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作者 季玉晓 贾瑛 +3 位作者 王幸运 李明 侯立安 贺亚南 《化工新型材料》 CAS CSCD 北大核心 2016年第8期148-150,共3页
在水解水热法制备锐钛矿型纳米TiO_2的基础上,通过改进尿素均匀沉淀法制备了锐钛矿型TiO_2/ZnO纳米复合颗粒。利用X射线衍射(XRD)分析、透射电镜(TEM)与扫描电镜(SEM)分析、X射线能谱(EDS)等对纳米TiO_2/ZnO复合颗粒进行表征,并... 在水解水热法制备锐钛矿型纳米TiO_2的基础上,通过改进尿素均匀沉淀法制备了锐钛矿型TiO_2/ZnO纳米复合颗粒。利用X射线衍射(XRD)分析、透射电镜(TEM)与扫描电镜(SEM)分析、X射线能谱(EDS)等对纳米TiO_2/ZnO复合颗粒进行表征,并对TiO_2/ZnO纳米复合颗粒的紫外、红外区电磁吸收性能进行了研究。结果表明:随着钛含量增加,锐钛矿型TiO_2/ZnO复合颗粒在中波紫外区吸收性能略有增强,但在长波紫外区段,其吸收效果不及单纯纳米ZnO颗粒;在红外光谱中,TiO_2/ZnO复合颗粒在近红外区的吸收能力较纯ZnO颗粒大大增强。 展开更多
关键词 锐钛矿型TiO_2 ZNO 纳米复合颗粒 尿素均匀沉淀法 光学性能
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