葛洲坝三号船闸人字门振动状态监测系统设计

发布时间：2018-01-19 02:24

本文关键词： 船闸人字门模态分析振动监测　出处：《大连海事大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着近年长江航运事业的高速发展,葛洲坝船闸年通过量增速迅猛,对长江黄金水道航运功能的关键性作用日益彰显。船闸人字门长期工作在低速重载工况条件下,随着闸门启闭次数的增加,加之涌浪、动水载荷、及水下门体两侧巨大水压等共同作用将对船闸受到外力作用而引发门体振动。而当激振频率接近人字门固有频率时,会引发门体共振,产生应力集中现象,将对船闸人字门的结构产生破坏性影响,不但影响通航安全,还将带来严重的社会影响和经济损失。因此如何正确有效监测并评估船闸人字门等大型金属结构尤其是水下结构的振动状况显得尤为重要。本文结合葛洲坝3#船闸人字门,结合水下复杂工况,基于模态分析的结果布设压电式加速度传感器,重点监测门体顶枢与底止水座板的振动状态,编写软件采集和处理门体加速度信息,取得了一系列有效成果:(1)根据船闸人字门结构和工作过程,建立人字门启闭状态三维模型,依据人字门运行中受力情况施加边界约束条件,通过模态分析确定人字门固有频率和各阶振型,获得受力集中区域和振动源信息,结果表明顶枢和底止水存在应力集中。(2)提出了一种船闸人字门振动状态监测系统的总体框架和实现方法,分别设计了基于压电加速度传感器与光学F-P加速度传感器的Labview程序,实时采集闸门运行时的振动信号予以显示和存储。(3)选取压电加速度传感器测量了船闸人字门的振动信号,通过信号处理方法计算了门体运行中的位移信息,对振动信号的实测与处理结果进行了分析。结果表明顶枢振动状态反映了门体起伏程度,底止水振动大小反映了其阻水性能优劣,并可以间接反映底止水脱落的可能性。
[Abstract]:With the rapid development of the Yangtze River shipping industry in recent years, the annual throughput of Gezhouba lock is increasing rapidly. The key to the navigation function of the Yangtze River golden waterway is becoming more and more obvious. Under the condition of low-speed and heavy-load working condition the herringbone gate of ship lock works under the condition of low speed and heavy load with the increase of gate opening and closing times plus surge wave and dynamic water load. When the exciting frequency is close to the natural frequency of the herringbone gate, it will cause the gate body resonance, which will produce the phenomenon of stress concentration. It will have a destructive effect on the structure of herringbone gate of ship lock, and not only affect navigation safety. Therefore, it is very important to correctly and effectively monitor and evaluate the vibration of large metal structures such as lock gates, especially underwater structures. Lock herringbone door. Based on the results of modal analysis, piezoelectric accelerometers are arranged to monitor the vibration state of the top and bottom blocks of the door body, and compile software to collect and process the acceleration information of the door body. A series of effective results are obtained: 1) according to the structure and working process of the herringbone gate of the ship lock, the three-dimensional model of the opening and closing state of the herringbone gate is established, and the boundary constraint condition is imposed according to the stress condition of the herringbone gate in operation. The natural frequencies and modes of the herringbone gate are determined by modal analysis, and the information of the concentrated region and vibration source are obtained. The results show that there is stress concentration in the top and bottom water stop. (2) an overall frame and realization method of the vibration monitoring system for the herringbone gate of ship lock are presented. The Labview programs based on piezoelectric accelerometer and optical F-P accelerometer are designed respectively. The vibration signal of the shiplock herringbone gate was measured by using piezoelectric accelerometer to display and store the vibration signal of the gate when it was running in real time. The displacement information is calculated by the signal processing method, and the measured and processed results of the vibration signal are analyzed. The results show that the vibration state of the top pivot reflects the relief degree of the door body. The size of the bottom water stop vibration reflects its water resistance performance, and can indirectly reflect the possibility of the bottom water stop shedding.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP274;U641

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