發(fā)布時(shí)間：2018-04-18 21:23

  本文選題：振動(dòng)篩支架結(jié)構(gòu) + 結(jié)構(gòu)振動(dòng)��； 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：現(xiàn)如今煤炭仍然是我國的主導(dǎo)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(shù)不斷發(fā)展,由最原始的跳汰選煤到浮選再到現(xiàn)在的重介質(zhì)分選技術(shù),選煤技術(shù)不斷升級(jí)給設(shè)備支架結(jié)構(gòu)也帶來了嚴(yán)峻挑戰(zhàn)——結(jié)構(gòu)振動(dòng)。結(jié)構(gòu)振動(dòng)不僅對(duì)支架結(jié)構(gòu)的安全性產(chǎn)生影響,還會(huì)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(jié)構(gòu)的振動(dòng)特性并對(duì)其振動(dòng)進(jìn)行控制就十分必要。針對(duì)選煤廠支架結(jié)構(gòu)存在的安全性問題,重點(diǎn)研究了振動(dòng)篩支架結(jié)構(gòu)的動(dòng)力學(xué)特性,包括不同工況下振動(dòng)篩支座、前端梁板的振動(dòng)等。本研究主要針對(duì)山西陽光焦化集團(tuán)選煤廠一廠主廠房鋼筋混凝土框架結(jié)構(gòu),采用北京東方噪聲與振動(dòng)研究所研發(fā)制造的INV-6032T智能信號(hào)采集處理分析系統(tǒng),測(cè)試使用Dasp大容量信號(hào)采集分析軟件及941B型電動(dòng)式傳感器,對(duì)該選煤廠支架結(jié)構(gòu)進(jìn)行了動(dòng)力特性測(cè)試,發(fā)現(xiàn)該支架結(jié)構(gòu)個(gè)別測(cè)點(diǎn)處存在振動(dòng)幅度較大的問題,并根據(jù)相關(guān)規(guī)范對(duì)該支架結(jié)構(gòu)振動(dòng)的影響進(jìn)行了評(píng)價(jià)。采用ANSYS有限元分析軟件對(duì)該結(jié)構(gòu)進(jìn)行了模態(tài)分析,分析振動(dòng)較大的原因;采用ANSYS對(duì)該結(jié)構(gòu)進(jìn)行了諧響應(yīng)分析并與動(dòng)力特性測(cè)試結(jié)果進(jìn)行對(duì)比,找到結(jié)構(gòu)的薄弱部位;通過ANSYS試算對(duì)該支架結(jié)構(gòu)進(jìn)行振動(dòng)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(jié)構(gòu)剛度,試算找到最優(yōu)解并對(duì)結(jié)構(gòu)的自振頻率、最大峰值速度與最大峰值位移的控制效果進(jìn)行分析,提出振動(dòng)控制方案;采用相同的方法對(duì)加固后的結(jié)構(gòu)進(jìn)行動(dòng)力特性復(fù)測(cè),并與初測(cè)結(jié)果與有限元分析結(jié)果進(jìn)行對(duì)比分析,發(fā)現(xiàn)結(jié)構(gòu)的自振頻率遠(yuǎn)離了振動(dòng)篩的激振頻率,降低了結(jié)構(gòu)發(fā)生共振的可能性,結(jié)構(gòu)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(dòng)控制效果,該支架結(jié)構(gòu)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(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD452

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