Fatigue analysis and life prediction method for cylinder block of aviation piston pump
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摘要:
缸体是航空柱塞泵核心部件之一,其直接影响航空柱塞泵的功能。针对目前缸体寿命研究的实验周期长、缺乏理论分析方法的不足,提出了基于有限元分析和线性累积损伤理论的缸体疲劳分析和寿命预测方法。首先,基于理论力学和材料力学建立缸体的力学模型,在MATLAB平台上进行仿真分析,计算缸体受力;其次,建立缸体的有限元模型,在ANSYS平台上计算缸体的应力和应变;然后,将缸体应力、应变等结果导入nCode中,基于线性累积损伤理论,探究缸体的薄弱部位及影响缸体疲劳寿命的因素;最后,进行实验验证。结果表明,靠近配流盘一侧的柱塞腔外壁较为薄弱,容易出现疲劳破坏,与仿真结果基本吻合,验证了所提的缸体疲劳分析和寿命预测方法的正确性,为结构紧凑型柱塞泵缸体的设计提供参考。
Abstract:The cylinder block is the crucial part of the aviation piston pump, which can directly affect the function of aviation piston pump. In view of the drawbacks of long test period and lacking theoretical approaches, a method for fatigue analysis and life prediction of the cylinder block is proposed based on finite element method and linear cumulative damage theory. Firstly, the mechanical model of the cylinder block is established using theoretical mechanics and material mechanics, and the force analysis calculation is implemented on MATLAB. Then, the finite element model of the cylinder block is established on ANSYS platform in order to simulate the stress and strain. Further, the results of stress and strain are imported into nCode to find out the weak parts of the cylinder block and investigate the affecting factors of the fatigue life based on linear cumulative damage theory. Finally, the verification test is carried out. The result shows that the outer wall of the piston chamber near the side of the distribution plate is weak and prone to fatigue damage, and the damage part of the experimental pump is approximately coincident with the simulation, which can validate the correctness of method for the fatigue analysis and life prediction of the cylinder block. The study findings of this paper can provide guidelines for designing the cylinder block of compact piston pumps.
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Key words:
- piston pump /
- cylinder block /
- fatigue damage /
- life prediction /
- linear cumulative damage
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表 1 柱塞泵结构参数
Table 1. Structure parameters of piston pump
参数 数值 mz/kg 0.125 Rf/mm 40 d/mm 20 z 9 α′/(°) 32 γ/(°) 15 f0 0.05 f1 0.12 lmin/mm 30 LH/mm 18 LZ/mm 10 R1/mm 30 R2/mm 33.5 R3/mm 42.5 R4/mm 48.5 -
[1] WANG X J, LIU S R.Remaining useful life prediction based on the Wiener process for an aviation axial piston pump[J].Chinese Journal of Aeronautics, 2016, 29(3):779-788. doi: 10.1016/j.cja.2015.12.020 [2] 权凌霄, 李东, 张文文.轴向柱塞泵主轴及缸体旋转组件临界转速分析[J].液压与气动, 2015(10):12-17. doi: 10.11832/j.issn.1000-4858.2015.10.002QUAN L X, LI D, ZHANG W W.Analysis of critical speed of axial piston pump spindle and cylinder rotating components[J].Hydraulic and Pneumatic, 2015(10):12-17(in Chinese). doi: 10.11832/j.issn.1000-4858.2015.10.002 [3] LI T Y, WANG S P, SHI J.An adaptive-order particle filter for remaining useful life prediction of aviation piston pumps[J].Chinese Journal of Aeronautics, 2018, 31(5):941-948. doi: 10.1016/j.cja.2017.09.002 [4] BACHSCHMID N, PENNACCHI P, TANZI E, et al.Crack detectability in vertical axis cooling pumps during operation[J].International Journal of Rotating Machinery, 2004, 10(2):121-133. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=57f7cc98a880d8dc727115e4cf42947a [5] 张斌.轴向柱塞泵的虚拟样机及油膜压力特性研究[D].杭州: 浙江大学, 2009: 15-23. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y1640355ZHANG B.Research on virtual prototype and oil film pressure characteristics of axial piston pump[D].Hangzhou: Zhejiang University, 2009: 15-23(in Chinese). http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y1640355 [6] 王占林.飞机高压液压能源系统[M].北京:北京航空航天大学出版社, 2004:34-152.WANG Z L.Aircraft high pressure hydraulic energy system[M].Beijing:Beihang University Press, 2004:34-152(in Chinese). [7] 宋起跃, 张立群.斜盘型轴向柱塞泵柱塞副受力分析[J].兵工学报, 1999(3):25-31. doi: 10.3321/j.issn:1000-1093.1999.03.007SONG Q Y, ZHANG L Q.Stress analysis of plunger pair of swashplate axial piston pump[J].Journal of Ordnance Engineering, 1999(3):25-31(in Chinese). doi: 10.3321/j.issn:1000-1093.1999.03.007 [8] 宁贻江.斜杠斜盘柱塞泵参数化设计[D].淮南: 安徽理工大学, 2011: 72-87. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y1976381NING Y J.Parametric design of swash plate swash pump[D].Huainan: Anhui Science and Technology University, 2011: 72-87(in Chinese). http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y1976381 [9] 焦明华, 邱婷.基于ANSYS-Workbench的BY004-1型轴向柱塞泵缸体的结构优化[J].液压与气动, 2013(7):33-36. doi: 10.11832/j.issn.1000-4858.2013.07.010JIAO M H, QIU T.Structural optimization of BY004-1 axial piston pump cylinder based on ANSYS-Workbench[J].Hydraulic and Pneumatic, 2013(7):33-36(in Chinese). doi: 10.11832/j.issn.1000-4858.2013.07.010 [10] 邓海顺, 黄坤.平衡式两排轴向柱塞泵缸体倾覆力矩[J].吉林大学学报, 2015, 45(5):1468-1473. http://d.old.wanfangdata.com.cn/Periodical/jlgydxzrkxxb201505014DENG H S, HUANG K.Balanced two-row axial piston pump cylinder overturning moment[J].Journal of Jilin University, 2015, 45(5):1468-1473(in Chinese). http://d.old.wanfangdata.com.cn/Periodical/jlgydxzrkxxb201505014 [11] 徐斌, 郭世永.应力-寿命分析法在铝合金轮圈疲劳分析中的应用[J].重庆工学院学报, 2008, 22(5):14-16. http://d.old.wanfangdata.com.cn/Periodical/cqgxyxb200805004XU B, GUO S Y.Application of stress-life analysis method in fatigue analysis of aluminum alloy wheels[J].Journal of Chongqing Institute of Technology, 2008, 22(5):14-16(in Chinese). http://d.old.wanfangdata.com.cn/Periodical/cqgxyxb200805004 [12] 林旺阳, 陶淑.基于nCode Design-Life传动轴可靠性分析[J].机械与电子, 2016, 34(5):21-24. doi: 10.3969/j.issn.1001-2257.2016.05.005LIN W Y, TAO S.Reliability analysis based on nCode Design-Life drive shaft[J].Machinery and Electronics, 2016, 34(5):21-24(in Chinese). doi: 10.3969/j.issn.1001-2257.2016.05.005 [13] GAO Y, LONG, PANG Y, et al.Fatigue properties of an electrical steel and design of EV/HEV IPM motors for durability and efficiency[C]//Society of Automotive Engineers, 2010, 1: 1308. [14] EINOLGHOZATI M, FARAHANI M K.A novel approach for numerical calculation and optimization of high-cycle fatigue life under multi-axial loads[C]//Society of Automotive Engineers, 2014, 1: 0968. [15] 郭卫东.斜盘式轴向柱塞泵计算机辅助设计研究[D].北京: 北京航空航天大学, 1995: 42-55. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y205034GUO W D.Research on computer aided design of swashplate axial piston pump[D].Beijing: Beihang University, 1995: 42-55(in Chinese). http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y205034 [16] JEONG H S, KIM H E.On the instantaneous and average piston friction of swash plate type hydraulic axial piston machines[J].KSME International Journal, 2004, 18(10):1700-1711. doi: 10.1007/BF02984318 [17] 张雪超.航空柱塞泵滑靴副和柱塞副油膜特性研究[D].杭州: 浙江大学, 2016: 30-44. http://cdmd.cnki.com.cn/Article/CDMD-10335-1016042285.htmZHANG X C.Study on characteristics of oil film of aviation piston pump slipper pair and plunger pair[D].Hangzhou: Zhejiang University, 2016: 30-44(in Chinese). http://cdmd.cnki.com.cn/Article/CDMD-10335-1016042285.htm [18] 邱婷.BY004-1型轴向柱塞泵缸体变形分析及结构优化[D].合肥: 合肥工业大学, 2013: 28-34. http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y2302134QIU T.Deformation analysis and structure optimization of BY004-1 axial piston pump cylinder block[D].Hefei: Hefei Technology University, 2013: 28-34(in Chinese). http://www.wanfangdata.com.cn/details/detail.do?_type=degree&id=Y2302134 [19] 李彬.雨流计数法在结构疲劳损伤计算中的应用[J].科技视界, 2015, 16(6):141-146. doi: 10.3969/j.issn.2095-2457.2015.06.105LI B.Application of rainflow counting method in structural fatigue damage calculation[J].Science & Technology Vision, 2015, 16(6):141-146(in Chinese). doi: 10.3969/j.issn.2095-2457.2015.06.105 [20] REN H M, CHEN L H.Fatigue analysis of automobile control arm based on nCode[C]//International Conference on Transportation and Traffic Engineering, 2016, 81: 1051-1053. [21] 卢黎明, 余云云.基于nCode DesignLife的滑滚轴承疲劳寿命比较分析[J].机械传动, 2017, 23(3):114-119.LU L M, YU Y Y.Comparative analysis of fatigue life of sliding bearing based on nCode DesignLife[J].Mechanical Transmission, 2017, 23(3):114-119(in Chinese).