發(fā)布時間：2018-04-18 21:23

  本文選題：振動篩支架結構 + 結構振動　； 參考：《太原理工大學》2017年碩士論文

【摘要】：現如今煤炭仍然是我國的主導能源,選煤是煤炭業(yè)發(fā)展的重要環(huán)節(jié),近年來我國選煤技術不斷發(fā)展,由最原始的跳汰選煤到浮選再到現在的重介質分選技術,選煤技術不斷升級給設備支架結構也帶來了嚴峻挑戰(zhàn)——結構振動。結構振動不僅對支架結構的安全性產生影響,還會威脅到操作人員的身體健康,在一定程度上制約了我國煤炭工業(yè)的發(fā)展,因此掌握支架結構的振動特性并對其振動進行控制就十分必要。針對選煤廠支架結構存在的安全性問題,重點研究了振動篩支架結構的動力學特性,包括不同工況下振動篩支座、前端梁板的振動等。本研究主要針對山西陽光焦化集團選煤廠一廠主廠房鋼筋混凝土框架結構,采用北京東方噪聲與振動研究所研發(fā)制造的INV-6032T智能信號采集處理分析系統(tǒng),測試使用Dasp大容量信號采集分析軟件及941B型電動式傳感器,對該選煤廠支架結構進行了動力特性測試,發(fā)現該支架結構個別測點處存在振動幅度較大的問題,并根據相關規(guī)范對該支架結構振動的影響進行了評價。采用ANSYS有限元分析軟件對該結構進行了模態(tài)分析,分析振動較大的原因;采用ANSYS對該結構進行了諧響應分析并與動力特性測試結果進行對比,找到結構的薄弱部位;通過ANSYS試算對該支架結構進行振動控制分析,采用局部加大截面和局部增加支撐等方式增加結構剛度,試算找到最優(yōu)解并對結構的自振頻率、最大峰值速度與最大峰值位移的控制效果進行分析,提出振動控制方案;采用相同的方法對加固后的結構進行動力特性復測,并與初測結果與有限元分析結果進行對比分析,發(fā)現結構的自振頻率遠離了振動篩的激振頻率,降低了結構發(fā)生共振的可能性,結構的最大峰值速度與最大峰值位移均有所減小,表明上述方案起到了良好的振動控制效果,該支架結構的安全問題得到解決。
[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.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD452

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本文編號：1770130