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| 1 | 人工槽模拟GH4169涡轮盘表面裂纹缺陷的微磁检测显示文摘针对航空发动机涡轮盘表面裂纹缺陷,提出一种地磁场环境下的微磁无损检测(NDT)方法。磁化试验测得了广泛使用的镍基高温合金GH4169材料的磁化特性曲线,通过磁性分析,证明该材料的相对磁导率略大于空气的相对磁导率,为弱顺磁性物质。理论分析了微磁检测适用于涡轮盘试件的检测原理和缺陷处的磁异常特征,通过对预置人工槽缺陷的涡轮盘试块进行检测,验证了理论分析的正确性。检测结果表明,随着涡轮盘表面裂纹宽度和深度的增加,磁异常的宽度和峰值也相应增加,裂纹宽度相同时,深度越深,或者说深宽比越大,磁异常越明显,且裂纹产生的位置对定位精度存在一定的影响。该微磁检测方法为涡轮盘表面裂纹缺陷的有效检测提供了新的思路,能进一步推广应用于飞机发动机的其他部件,如转子叶片、涡轮轴等,以及飞机机身上具有相似磁学特性的材料的无损检测。 | 胡博 于润桥 徐伟津 | 2015 | 航空学报2015，36，10： | 14 |
| 2 | 含剪力销(锥)螺栓法兰连接结构弯剪扭耦合振动研究显示文摘大型工业装备中的连接结构,往往处于复杂多样的外载荷环境中,其振动特性分析尤为重要。针对含剪力销(锥)的螺栓法兰连接结构的振动特性开展研究,根据该类结构在实际工况中受弯、剪、扭组合作用的特点,建立了两种多自由度的质量-非线性弹簧系统,分别讨论了系统在弯剪组合作用以及扭转作用下的振动特性、耦合关系。在此基础上,研究锥角不同、装配间隙不同对螺栓最大拉力的影响,并给出相应关系图;指出在两种工况下剪力销最佳设计角度区间及相应的装配间隙。 | 芦旭 张宇航 陈岩 毛鹏程 余飞 关振群 | 2017 | 振动与冲击2017，36，2： | 9 |
| 3 | 相控阵自定义聚焦的有限元模拟及其应用显示文摘在超声相控阵检测技术的工业应用中,单层聚焦方式虽能简化仪器系统并在聚焦层达到较高的检测精度,但其检测范围较小且可能导致在焦区外的漏检。提出3种自定义聚焦方案以满足各种检测需求,通过聚焦声场的有限元模型分析各自定义聚焦方案下的声场分布特征,据此制定声场控制方案并进行实际检测试验以验证自定义聚焦的检测效果。研究结果表明,相控阵聚焦声场的有限元模型直观显示了自定义聚焦模式下的聚焦声场特征及其影响因素,有助于指导设计自定义聚焦模式;与有限元分析结果一致,通过改变阵元组合方式、焦点分布可灵活改变聚焦声场以适应特定的检测要求。 | 陈振华 许倩 王婵 卢超 | 2018 | 电子测量与仪器学报2018，32，12： | 4 |
| 4 | 轮盘超椭圆异型螺栓孔均衡优化设计显示文摘基于降低航空发动机轮盘孔结构孔边应力和装配的双重考虑,提出了1种超椭圆曲线轮盘螺栓孔均衡优化设计方法。在降低孔边应力的基础上,引入了异型度概念以表示孔轮廓形状变化幅度,针对孔边应力降低和异型度减小2个互相制约的优化目标,构建了1个均衡优化模型;结合Paret o最优解理论,采用多目标进化算法对轮盘超椭圆异型孔进行寻优,得到了超椭圆异型螺栓孔轮廓的最优解。结果表明:设计得到的超椭圆螺栓孔结构可以在保证可靠传力的同时,使孔边应力降低19%。与其他异型孔方案相比,该模型设计参数少,模型简洁,均衡优化所获得的超椭圆异型孔的设计稳健性较好。 | 韩佳欣 郭海丁 | 2018 | 航空发动机2018，44，2： | 2 |
| 5 | Optimal location and shape definition of elliptical ventilation openings on aero engine turbine rotors with stress concentration effect显示文摘The aero engine turbine rotors are under strong centrifugal load and the highest thermal load.The ventilation openings on the rotors are inevitable,because air flow need to pass through them to cool the temperatures down and keep the air pressure balanced in internal aero engine.The ventilation openings will lead to stress concentration effect.In this paper,the stress concentration factor of elliptical opening on rotating disc is deduced by superposition method.How to define the optimal location and shape of the elliptical opening on rotating disc to decrease the stress concentration effect has been investigated specifically.The reliability and accuracy of the theoretical deviation process is verified by Finite Element Method(FEM).The process of how to obtain the optimal location of the elliptical ventilation opening with particular shape on turbine sealing disc is described as an engineering application case.The investigation provides sufficient theoretical support for optimal location and shape definition of elliptical ventilation opening on aero engine rotors with stress concentration effect by pure mechanics consideration. | Haibing YU Tiefeng CHEN Yanjie QIU | 2022 | Chinese Journal of Aeronautics2022，35，1： | 1 |
| 6 | Structural design and optimization for vent holes of an industrial turbine sealing disk显示文摘Severe stress concentration occurs around circular vent holes of an industrial turbine sealing disk.This paper investigates the structural design and optimization for the vent holes to effectively reduce the maximum von Mises stress and improve the fatigue life of the turbine sealing disk.An efficient integrated design optimization method is presented based on a novel non-circular vent hole design method in combination with a variable dimension sub-model method,a self-developed modeling and meshing tool,and the Multi-Island Genetic Algorithm.The proposed non-circular vent hole is biaxial symmetric and consists of four smoothly connected arcs.The variable dimension sub-model method is utilized to obtain accurate results in the fields around the vent holes within the computationally acceptable time.The modeling and meshing tool is developed by using the Tcl/Tk Scripts to rebuild the geometry and generate the high-quality hexahedral mesh automatically.The Multi-Island Genetic Algorithm is adopted to solve the studied constrained optimization problem.After optimization,the maximum von Mises stress is reduced from 1305.644 MPa to 963.435 MPa,and the fatigue life is increased from 3091 cycles to 30,297 cycles.The results show that the proposed design and optimization methods can significantly improve the performance of the turbine sealing disk along with the remarkable drop in stress concentration. | Cheng YAN Jianfeng ZHU Xiuli SHEN Jun FAN Zhigang JIA Tiefeng CHEN | 2021 | Chinese Journal of Aeronautics2021，34，5： | 0 |
| 7 | Detection of Cracks in Aerospace Turbine Disks Using an Ultrasonic Phased Array C-scan Device显示文摘Crack detection in an aerospace turbine disk is essential for aircraft-quality detection.With the unique circular stepped structure and superalloy material properties of aerospace turbine disk,it is difficult for the traditional ultrasonic testing method to perform efficient and accurate testing.In this study,ultrasound phased array detection technology was applied to the non-destructive testing of aviation turbine disks:(i)A phased array ultrasonic c-scan device for detecting aerospace turbine disk cracks(PAUDA)was developed which consists of phased array ultrasonic,transducers,a computer,a displacement encoder,and a rotating scanner;(ii)The influence of the detection parameters include frequency,wave-type,and elements number of the ultrasonic phased array probe on the detection results on the near-surface and the far surface of the aerospace turbine disk is analyzed;(iii)Specimens with flat-bottom-hole(FBH)defects were scanned by the developed PAUDA and the results were analyzed and compared with the conventional single probe ultrasonic water immersion testing.The experiment shows that by using the ultrasonic phased array c-scan to scan the turbine disk the accuracy of the detection can be significantly improved which is of greater accuracy and higher efficiency than traditional immersion testing. | Qian Xu Haitao Wang Zhenhua Chen Zhigang Huang Pan Hu | 2021 | Structural Durability & Health Monitoring2021，15，1： | 0 |
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