大型化工管道受管内流体流动、边界约束、振源激励等复杂因素影响,服役期间往往会发生振动,其振动频率相较于土木结构较高,且可能存在多个主要频率成分.若采用单一频率的调谐质量阻尼器(Tuned Mass Damper,TMD),难以达到理想的控制效果,而采用多重调谐质量阻尼器(Multiple Tuned Mass Damper,MTMD)时,受现场条件限制,又存在无法确定最优安装位置等问题.本文开展了基于MTMD的管道倍频响应减振研究.首先,开展了某化工企业丙烷脱氢装置的大型管道现场实测研究,发现管道振动频率存在明显的倍数关系,即倍频现象.其次,建立局部管道有限元模型,分析管道动力特性,提出了基于数值搜索法的MTMD参数设计方法 .最后,考虑化工管道现场安装条件的限制,研究了MTMD安装位置对管道减振效果的影响.数值研究结果表明,安装MTMD可有效减小管道振动响应.
Abstract
Large-scale chemical pipelines, influenced by factors such as fluid flow, boundary constraints, and source excitations, often experience vibrations during service. Unlike civil structures, these vibrations exhibit higher frequencies and may involve multiple dominant frequency components. Traditional single-frequency tuned mass dampers (TMD) struggle to achieve optimal control in this context. Meanwhile, the application of multiple tuned mass dampers (MTMD) is hindered by the challenges in determining optimal installation locations due to on-site constraints. This paper explores the mitigation of pipeline harmonic responses using MTMD. Firstly, an on-site measurement study was conducted on a propane dehydrogenation unit in a chemical plant, revealing evident frequency multiples or harmonic phenomena. Subsequently, a finite element model for local pipeline segments was established to analyze dynamic characteristics. A parameter design method for MTMD based on numerical search algorithms was proposed. Lastly, considering the limit of practical installation conditions for chemical pipelines, the impact of MTMD installation positions on vibration reduction effectiveness was investigated. Numerical results show that the vibration of pipelines can be significantly reduced by using MTMD.
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