液压源管路系统随机压力脉动可靠性研究
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摘要
将液压源管路系统的压力脉动近似为平稳随机过程。在频响特性的基础上,计算随机白噪声泵源流量脉动激励下管路终端压力脉动的均方差。分别采用首次超越破坏和疲劳累积破坏准则,对液压源终端管路随工作时间的可靠度变化历程进行了仿真,得到了泵源脉动幅值对管路系统可靠性的影响。结果表明,小于额定压力10%的压力脉动评估方法不能满足液压系统安全性要求。所提出的基于可靠性的液压管路系统耐随机压力脉动的评估方法,为液压系统的动强度安全性评估和设计提供了新的参考和指导。
The pressure pulsations inner the hydraulic power pipelines were treated as a stationary random process approximately.Based on frequency-responses results,the mean square deviation of terminal pressure pulsations was calculated under the white noise excitation of pumping source.The first-passage failure criterion and fatigue damage accumulation failure criterion were adopted to analyze the dynamic pressure reliability respectively,and the influence of pulsation amplitude of pumping source on the reliability of pipelines was studied.The results indicate that the traditional estimation method for the pressure pulsation below 10% of rated pressure does not meet the security specification of hydraulic power unit.The evaluation method for random pressure pulsation based on reliability was proposed,which provides a new approach for dynamics assessment and design of hydraulic pipelines.
The pressure pulsations inner the hydraulic power pipelines were treated as a stationary random process approximately.Based on frequency-responses results,the mean square deviation of terminal pressure pulsations was calculated under the white noise excitation of pumping source.The first-passage failure criterion and fatigue damage accumulation failure criterion were adopted to analyze the dynamic pressure reliability respectively,and the influence of pulsation amplitude of pumping source on the reliability of pipelines was studied.The results indicate that the traditional estimation method for the pressure pulsation below 10% of rated pressure does not meet the security specification of hydraulic power unit.The evaluation method for random pressure pulsation based on reliability was proposed,which provides a new approach for dynamics assessment and design of hydraulic pipelines.
引文
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[2]蔡亦钢.流体传输管道动力学[M].杭州:浙江大学出版社,1990.
[3]潘陆原,王占林,张若青.飞机高压液压管路系统特性研究[J].航空科学技术,1994,4:26-27.
[4]焦宗夏.飞机液压能源管路系统的振动特性分析[J].北京航空航天大学学报,1997,23(3):316-321.
[5]肖文键,朱庆友,潘陆原.某型飞机液压能源系统频域特性分析[J].空军工程大学学报(自然科学版),2000,1(4):9-12.
[6]阎祥安,张承谱,沈嘉琦.周期性脉动流体的管路输送系统压力分布求解[J].机械工程学报,2001,37(3):38-40.
[7]郭晋挺,司马灿,刘建湖,等.舰艇管路系统的抗冲击性能弹性评估方法[J].船舶力学,2004,8(4):108-115.
[8]李兆俊,汪玉,陈学德,等.管路系统冲击设计方法分析[J].振动与冲击,2008,27(9):171-174.
[9]Shu J J,Burrows C R,Edge K A.Pressure pulsation inreciprocating pump piping systems[J].Proc Instn MechEngrs,1997,211:229-237.
[10]李桂青,曹宏,李秋胜,等著.结构动力可靠性理论及其应用[M].北京:地震出版社,1993.
[11]Becker G,Camarinopoulos L,Kabranis D.Dynamicreliability under random shocks[J].Reliability Engineeringand System Safety,2002(77):239-251.
[12]吴卫峰.液压系统液压脉动研究[J].浙江工业大学学报,2005,33(6):696-701.
[13]陈建军,曾余庚,戴宝华.多自由度体系在平稳随机反应下的动力可靠性分析[J].西安电子科技大学学报.1989,16(4):24-31.
[14]刘涛.飞机液压导管动态应力临界值确定方法研究[D].沈阳航空工业学院,2007.
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