多相流态输运管道随机不确定建模及振动分析

发布时间：2018-01-05 16:35

本文关键词：多相流态输运管道随机不确定建模及振动分析　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：在现代工业如石油、化工、核电、海洋工程等领域,输运管道被广泛应用于各类流态物料的传输,其系统安全性越来越受到人们的重视。开展多相流态输运管道振动研究,对于保证输运管道系统长期稳定工作和安全可靠运行,保障国民经济快速发展和社会安定,具有十分重要的意义。本文利用哈密顿原理和随机非线性动力学理论,研究了输运管道的随机不确定动力学建模方法,分析了系统参数对于管道动力学特性的影响。论文的主要工作有： 1、应用哈密顿原理和随机非线性动力学理论,结合输运管道的复杂运行环境,提出了随机不确定激励的模拟形式,建立了输运管道在两端固支和悬臂这两种边界情况下的随机非线性振动方程。 2、应用伽辽金离散方法和广义时间积分方法,求解输运管道振动响应,并采用一种特定Poincare映射方法,分析了输运管道的振动特性。 3、根据随机非线性振动方程分别研究两端固定支撑输运管道、悬臂输运管道的动力学特性,分析了管道固有频率变化规律以及随机不确定激励下的振动响应：借助相轨迹图和Poincare映射研究了激励频率、随机激励强度、谱宽参数以及运动约束强度和位置对输运管道振动特性的影响。 4、根据弹性约束对振动响应的影响分析,提出了弹性约束安装位置及弹性系数选择的合理建议,对输运管道系统的减振有一定的指导意义。 5、开展了输运管道振动实验研究,通过实验模态参数与理论模态参数的对比,验证了输运管道动力学模型的正确性；通过不同工况下的输运管道振动测试,分析了主要参数对其振动特性的影响。
[Abstract]:In modern industries such as petroleum, chemical industry, nuclear power, marine engineering and other fields, pipeline is widely used in the transport of all kinds of flow materials. More and more attention has been paid to the safety of the system. The research on the vibration of multi-phase flow pipeline can ensure the long-term stability and safe and reliable operation of the pipeline system. It is very important to guarantee the rapid development of national economy and social stability. In this paper, the stochastic uncertain dynamic modeling method of transportation pipeline is studied by using Hamiltonian principle and stochastic nonlinear dynamics theory. The influence of system parameters on the dynamic characteristics of pipeline is analyzed. The main work of this paper is as follows: 1. Applying Hamiltonian principle and stochastic nonlinear dynamics theory, combined with the complex operating environment of transportation pipeline, the simulation form of stochastic uncertain excitation is proposed. In this paper, the stochastic nonlinear vibration equations of a pipeline under two boundary conditions, namely, clamped at both ends and cantilever, are established. 2. Galerkin discrete method and generalized time integral method are used to solve the vibration response of transportation pipeline, and a special Poincare mapping method is used to analyze the vibration characteristics of transportation pipeline. 3. According to the stochastic nonlinear vibration equation, the dynamic characteristics of the fixed-supported pipeline and the cantilever pipeline are studied respectively. The variation law of natural frequency of pipeline and the vibration response under random uncertain excitation are analyzed. The excitation frequency and random excitation intensity are studied with the help of phase locus and Poincare map. The influence of spectrum width parameters, intensity and position of motion constraint on the vibration characteristics of pipeline. 4. According to the analysis of the effect of elastic constraint on vibration response, the reasonable suggestions on the location of elastic constraint installation and the selection of elastic coefficient are put forward, which is of certain guiding significance to the vibration reduction of transportation pipeline system. 5. The experimental study of pipeline vibration is carried out, and the correctness of the dynamic model of the pipeline is verified by comparing the experimental modal parameters with the theoretical modal parameters. The influence of the main parameters on the vibration characteristics of the pipeline is analyzed through the vibration test of the pipeline under different working conditions.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U171

【参考文献】