Pipeline system vibration and response characteristic analysis method considering parameter uncertainty

Abstract

The invention provides a pipeline system vibration and response characteristic analysis method considering parameter uncertainty, and belongs to the field of aviation pipeline system vibration and response characteristic analysis. The method comprises the following steps: determining a to-be-analyzed pipeline configuration and establishing an analysis or finite element dynamics analysis model of a pipeline; determining uncertainty parameters of the pipeline system to be analyzed; by utilizing an interval analysis method and combining engineering practice, representing the to-be-investigated uncertainty parameter as an interval number, and presetting an interval change range of the uncertainty parameter; calculating response corresponding to the uncertainty parameters by combining sampling methods such as Monte Carlo simulation; and analyzing the interval characteristics of the uncertain parameter response values. According to the method, the influence of parameter uncertainty is considered in the vibration and response characteristic analysis of the pipeline system, so that the dynamics design, optimization and other work of the pipeline in engineering can be more stably carried out.

Description

technical field [0001] The invention belongs to the technical field of analysis of vibration and response characteristics of an aviation pipeline system, and relates to a method for analyzing the vibration and response characteristics of a pipeline system considering parameter uncertainty, in particular to a method for equalizing the uncertainty parameters of the pipeline system as uniform The number of intervals of the distribution and the method to analyze and calculate the interval range of its vibration and response characteristics. Background technique [0002] The aviation pipeline system is an important part of the aviation hydraulic system and an important channel for the transmission of the hydraulic oil medium and the power transmission of the aircraft power system. The aviation hydraulic pipeline system is usually in a harsh vibration working environment during actual work, and is usually subjected to the action of basic excitation, fluid pressure pulsation harmon...

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Problems solved by technology

[0003] In the dynamic analysis of the aviation pipeline system, "avoiding resonance and reducing response" is an important analysis and design goal, but the actual aviation pipeline system often has parameter uncertainty factors, such as the uncertainty of material parameters, manufacturing Uncertainty of pipeline geometric parameters caused by errors or dimensional tolerances, uncertainty of model boundary conditions caused by assembly errors during assembly, and load uncertainties caused by changes in aircraft operating conditions, etc. Uncertainty factors will lead to Changes in the vibration and response characteristics of the piping system

[0004] The existing analysis of the vibration and response characteristics of the aviation pipeline system is mainly based on the definite state. The material parameters, geometric parameters, boundary conditions and load parameters of the analysis model used are generally fixed values, and the actual model does not take into account Uncertainty factors, the calculated results may deviate from the actual situation

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