振动筛支架结构的振动特性及减振技术研究

发布时间：2018-04-18 21:23

本文选题：振动筛支架结构 + 结构振动　；参考：《太原理工大学》2017年硕士论文

【摘要】：现如今煤炭仍然是我国的主导能源,选煤是煤炭业发展的重要环节,近年来我国选煤技术不断发展,由最原始的跳汰选煤到浮选再到现在的重介质分选技术,选煤技术不断升级给设备支架结构也带来了严峻挑战——结构振动。结构振动不仅对支架结构的安全性产生影响,还会威胁到操作人员的身体健康,在一定程度上制约了我国煤炭工业的发展,因此掌握支架结构的振动特性并对其振动进行控制就十分必要。针对选煤厂支架结构存在的安全性问题,重点研究了振动筛支架结构的动力学特性,包括不同工况下振动筛支座、前端梁板的振动等。本研究主要针对山西阳光焦化集团选煤厂一厂主厂房钢筋混凝土框架结构,采用北京东方噪声与振动研究所研发制造的INV-6032T智能信号采集处理分析系统,测试使用Dasp大容量信号采集分析软件及941B型电动式传感器,对该选煤厂支架结构进行了动力特性测试,发现该支架结构个别测点处存在振动幅度较大的问题,并根据相关规范对该支架结构振动的影响进行了评价。采用ANSYS有限元分析软件对该结构进行了模态分析,分析振动较大的原因;采用ANSYS对该结构进行了谐响应分析并与动力特性测试结果进行对比,找到结构的薄弱部位;通过ANSYS试算对该支架结构进行振动控制分析,采用局部加大截面和局部增加支撑等方式增加结构刚度,试算找到最优解并对结构的自振频率、最大峰值速度与最大峰值位移的控制效果进行分析,提出振动控制方案;采用相同的方法对加固后的结构进行动力特性复测,并与初测结果与有限元分析结果进行对比分析,发现结构的自振频率远离了振动筛的激振频率,降低了结构发生共振的可能性,结构的最大峰值速度与最大峰值位移均有所减小,表明上述方案起到了良好的振动控制效果,该支架结构的安全问题得到解决。
[Abstract]:Nowadays, coal is still the leading energy in our country, and coal preparation is an important link in the development of coal industry. In recent years, the coal preparation technology in China has been continuously developed, from the most primitive coal preparation to flotation to the present separation technology of heavy medium.The continuous upgrading of coal preparation technology has also brought severe challenge to the support structure of the equipment-structural vibration.Structural vibration not only has an impact on the safety of the support structure, but also threatens the health of the operators, and to a certain extent restricts the development of the coal industry in China.Therefore, it is necessary to master the vibration characteristics of the support structure and control its vibration.In view of the safety problems existing in the support structure of the coal preparation plant, the dynamic characteristics of the support structure of the vibrating screen are mainly studied, including the vibration of the support of the vibrating screen under different working conditions and the vibration of the front beam and plate, etc.This research mainly aims at the reinforced concrete frame structure of the main factory building of Shanxi Sunshine Coking Group Coal preparation Plant, and adopts the INV-6032T intelligent signal acquisition, processing and analysis system developed and manufactured by Beijing Oriental noise and Vibration Research Institute.The dynamic characteristics of the support structure of the coal preparation plant were tested by using the Dasp large capacity signal acquisition and analysis software and the 941 B type electric sensor. It was found that the vibration amplitude of the support structure at individual measuring points was large.The influence of vibration on the structure was evaluated according to the relevant codes.The modal analysis of the structure is carried out by using the ANSYS finite element analysis software, and the reason of the large vibration is analyzed, and the harmonic response analysis of the structure is carried out by using ANSYS and compared with the test results of the dynamic characteristics to find the weak part of the structure.The vibration control analysis of the support structure is carried out by means of ANSYS calculation. The stiffness of the structure is increased by means of local increase of cross-section and local increase of support, and the optimum solution is found and the natural vibration frequency of the structure is obtained.The control effect of the maximum peak velocity and the maximum peak displacement is analyzed, and the vibration control scheme is put forward, and the dynamic characteristics of the strengthened structure are measured again by the same method, and the results are compared with the results of the initial measurement and the finite element analysis.It is found that the natural vibration frequency of the structure is far away from the exciting frequency of the vibrating screen, and the possibility of resonance is reduced, and the maximum peak velocity and the maximum peak displacement of the structure are both reduced, which indicates that the above scheme has a good vibration control effect.The safety problem of the support structure has been solved.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD452

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