波纹管管道振动特性分析及测试
发布时间：2018-12-22 08:16
【摘要】：波纹管是工业管道系统的重要组成部分,在化学工业、电力能源、海洋工程、航空航天等领域有着非常广泛的应用。由于其具有膨胀节的结构形式,使它在管道系统中常常作为缓震降噪装置使用。然而,在使用过程中,波纹管的特殊结构必然导致它与流体的流动之间产生相互耦合作用,不可避免地引起管路振荡,从而降低系统运行的可靠性。本文主要工作的内容是:1)对国标中计算波纹管振动固有频率公式,用ansys有限元软件计算其轴向刚度系数,取代其轴向刚度系数公式,提高其计算非标准波纹管轴向振动固有频率的准确性,并计算波纹管横向振动固有频率;2)利用文献[16]给出的波纹管干模态固有频率的简化有限元算法及实验数据,验证了运用本文壳单元模型进行波纹管干模态计算的正确性;3)采用Pro/E和ICEM CFD联合建模的方式进行有限元模型的建立,给出了快速建立高质量的六面体实体单元网格和壳单元网格的方法,并指出了相比于其他一些方法所具有的优越性。4)利用ANSYS Workbench14.5以后新增的ACT(用户自定义模块)中的Acoustic Extension功能求解得到了充液波纹管的湿模态。5)利用CFX-ANSYS流-固耦合分析模块,在定常流速、两端固支边界条件下,仿真分析波纹管在双向流-固耦合作用下的瞬态响应,得出了响应的位移、速度、加速度值;同时还给出单向流-固耦合作用下波纹管的预应力模态。6)设计了一套研究水流作用下波纹管实际振动情况的输流管道装置,利用DASP信号采集分析仪对波纹管的轴向振动信号和横向振动响应信号进行了采集、分析。通过以上的工作得到以下结论:1)针对非标准波纹管轴向固有频率计算,国标公式中轴向刚度系数计算用有限元计算得出的数值代入,比用国标公式计算值代入,所得结果要准确的多;2)利用壳单元进行波纹管的模态计算比用实体单元结果更准确;3)利用Acoustic Extension进行波纹管湿模态求解的方法是可行的,同时也验证了波纹管的湿模态值比相应的干模态值低,表明流体的耦合作用降低了波纹管的固有频率;4)在流体流动的耦合作用下,波纹管产生了比较明显的振动,但由于模拟的流体流速较低,且模型的边界条件为固支,波纹管长度短,与之对应的临界流速高,因此所得耦合振动的幅值在微米级。5)利用试验装置分析验证了流体作用下波纹管的实际振动响应情况。
[Abstract]:Corrugated pipe is an important part of industrial pipeline system. It is widely used in chemical industry, power and energy, marine engineering, aerospace and other fields. Because of its structural form of expansion joint, it is often used as a damping and noise reducing device in pipeline system. However, the special structure of the bellows will inevitably lead to the interaction between the bellows and the fluid flow, which will inevitably lead to the pipeline oscillation, thus reducing the reliability of the system. The main contents of this paper are as follows: 1) to calculate the natural frequency formula of bellows vibration in national standard, the axial stiffness coefficient is calculated by ansys finite element software, instead of the axial stiffness coefficient formula. The accuracy of calculating the natural frequency of axial vibration of non-standard bellows is improved, and the natural frequency of transverse vibration of corrugated tubes is calculated. 2) by using the simplified finite element method and experimental data of natural frequency of corrugated tube dry mode given in reference [16], the correctness of using the shell element model to calculate the corrugated tube dry mode is verified. 3) the finite element model is built by Pro/E and ICEM CFD, and the method of fast building high quality hexahedron solid element mesh and shell element mesh is given. The advantages compared with other methods are pointed out. 4) using the Acoustic Extension function in the new ACT (user defined module) after ANSYS Workbench14.5 to get the wet mode of the bellows filled with fluid. 5) using CFX -ANSYS fluid-solid coupling analysis module, Under the condition of steady velocity and fixed boundary at both ends, the transient response of bellows under bidirectional fluid-solid coupling is simulated and the displacement, velocity and acceleration of the response are obtained. At the same time, the prestressing modes of the bellows under unidirectional fluid-solid coupling are given. 6) A set of pipeline devices for studying the actual vibration of the bellows under the action of water flow are designed. The axial vibration signal and transverse vibration response signal of bellows are collected and analyzed by DASP signal acquisition analyzer. The conclusions are as follows: 1) for the axial natural frequency calculation of non-standard bellows, the calculation of axial stiffness coefficient in the national standard formula is replaced by the finite element method, which is better than that calculated by the national standard formula. The results obtained are much more accurate; 2) the modal calculation of corrugated tube with shell element is more accurate than that with solid element; 3) it is feasible to use Acoustic Extension to solve the wet mode of bellows, and it is also proved that the wet mode value of bellows is lower than the corresponding dry mode value, which indicates that the coupling effect of fluid reduces the natural frequency of bellows. 4) under the coupling action of fluid flow, the bellows have more obvious vibration, but due to the low flow velocity of the simulated fluid, and the boundary condition of the model is fixed support, the length of the bellows is short, and the corresponding critical velocity is high. Therefore, the amplitude of the coupled vibration is in the micron order. 5) the actual vibration response of the bellows under the action of fluid is verified by the analysis of the experimental equipment.
【学位授予单位】：武汉轻工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U17
本文编号：2389549
[Abstract]:Corrugated pipe is an important part of industrial pipeline system. It is widely used in chemical industry, power and energy, marine engineering, aerospace and other fields. Because of its structural form of expansion joint, it is often used as a damping and noise reducing device in pipeline system. However, the special structure of the bellows will inevitably lead to the interaction between the bellows and the fluid flow, which will inevitably lead to the pipeline oscillation, thus reducing the reliability of the system. The main contents of this paper are as follows: 1) to calculate the natural frequency formula of bellows vibration in national standard, the axial stiffness coefficient is calculated by ansys finite element software, instead of the axial stiffness coefficient formula. The accuracy of calculating the natural frequency of axial vibration of non-standard bellows is improved, and the natural frequency of transverse vibration of corrugated tubes is calculated. 2) by using the simplified finite element method and experimental data of natural frequency of corrugated tube dry mode given in reference [16], the correctness of using the shell element model to calculate the corrugated tube dry mode is verified. 3) the finite element model is built by Pro/E and ICEM CFD, and the method of fast building high quality hexahedron solid element mesh and shell element mesh is given. The advantages compared with other methods are pointed out. 4) using the Acoustic Extension function in the new ACT (user defined module) after ANSYS Workbench14.5 to get the wet mode of the bellows filled with fluid. 5) using CFX -ANSYS fluid-solid coupling analysis module, Under the condition of steady velocity and fixed boundary at both ends, the transient response of bellows under bidirectional fluid-solid coupling is simulated and the displacement, velocity and acceleration of the response are obtained. At the same time, the prestressing modes of the bellows under unidirectional fluid-solid coupling are given. 6) A set of pipeline devices for studying the actual vibration of the bellows under the action of water flow are designed. The axial vibration signal and transverse vibration response signal of bellows are collected and analyzed by DASP signal acquisition analyzer. The conclusions are as follows: 1) for the axial natural frequency calculation of non-standard bellows, the calculation of axial stiffness coefficient in the national standard formula is replaced by the finite element method, which is better than that calculated by the national standard formula. The results obtained are much more accurate; 2) the modal calculation of corrugated tube with shell element is more accurate than that with solid element; 3) it is feasible to use Acoustic Extension to solve the wet mode of bellows, and it is also proved that the wet mode value of bellows is lower than the corresponding dry mode value, which indicates that the coupling effect of fluid reduces the natural frequency of bellows. 4) under the coupling action of fluid flow, the bellows have more obvious vibration, but due to the low flow velocity of the simulated fluid, and the boundary condition of the model is fixed support, the length of the bellows is short, and the corresponding critical velocity is high. Therefore, the amplitude of the coupled vibration is in the micron order. 5) the actual vibration response of the bellows under the action of fluid is verified by the analysis of the experimental equipment.
【学位授予单位】：武汉轻工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U17
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