基于误差可靠性分布的航空管道动力学响应实验与分析

通过管道稳态正弦基础激励动态响应实验,得到管道特定位置在不同激励频率下动力学响应实验数据;通过考虑了加速度传感器引起附加质量的航空管道模态特性及响应计算,并分别与管道实验数据进行对比分析;将计算值和实验值之间的误差作为分布变量,进行可靠性分布拟合和优良性检验;基于变量分布特性,结合发动机工作频率范围和数值计算结果,得到某型复杂航空管道在不同可靠度下的等效应力和位移响应值,并对其进行安全评估。结果表明:管道约束状态对模态测试和动态响应结果影响较大,数值计算结果和实验测试结果之间的误差服从正态分布,该分布可用于评估复杂管道的动力学特性。

Testing and Analyzing Dynamic Response of Aviation Pipeline Based on Error Reliability Distribution

The dynamic response data were obtained with different excitation frequencies at some specific spots of an ordinary pipeline through harmonic experiments in its steady state.Considering the additional mass caused by accelerometers,mode characteristics and dynamic response data were calculated and compared with test results respectively.The calculation errors of test results were regarded as error reliability distribution variables,and the error reliability distribution was simulated and combined with calculation results and working frequency range of a jet engine.The equivalent stress and displacement response data were also obtained with the error reliability distribution for a certain complex pipeline,and its safety was evaluated.The paper concludes that the mode test and dynamic response results have great impact on the pipeline constraint.The calculation errors and test results obey the Gaussian distribution.