| The workshop vibration is the multiple source coupled oscillation, and it involves the security of structures, normal operation of workshops, the product quality and so on. The people have not continuously stopped to research it. Along with the development of science and technology, the research contents also need the further development. The present paper discussed the workshop vibration questions which came from the Tianjin cement design institute in a project, and gave research and analysis from several aspects about these problems.First, the paper introduced the vibration questions of the cement workshop, the present situation, and indicates research background and the research work. And then gave the scene vibration test on the SanShi cement workshop, carried on the spectral analysis to the test data, obtained the vibration frequency, and grasped the vibration rule of the structure. And obtained the results: the level displacement peak-to-peak value of the floor under the source equipment was 0.108/18.3=5.9mm; the vertical displacement peak-to-peak value of the floor under the source equipment was 0.0861/4772=0.018mm; the level frequency range of source equipments was between 0.6-1.6Hz; the vertical frequency range of source equipments was between 12-25Hz. So the level vibration displacement of the floor was oversized, and needed to be reinforced.Utilized finite element software ANSYS, carried on mode analysis, harmony response analysis, and obtained the conclusion: The horizontal vibration oversized question of the workshop was because of resonant response(Structure's first frequency is 0.84Hz. Structure's second frequency was 0.96Hz. The electrical machinery's level frequency was 0.6Hz. The wind tunnel's level frequency is 0.65-0.8Hz. The spiral conveyer's level frequency is 0.75Hz. And then the stagger degree of the structure's frequency and the source equipment's frequency is smeller than 20%, and resonant response is arosed). The computation obtains the level displacement peak-to-peak value of the floor which was 5.2mm. The simulation was accurate, and needed to be gave reinforcement measures.Gave reinforcement measures: To increases the steel underpin in the level of thestructure(equilateral single angle steel Z,200x 16 ),and the reinforcement position is between elevation 14.900m and 23.400m. By these, enhanced the level rigidity of the structure, enlarged the structure's frequencies, eliminates resonates response, and reduced the level vibration displacement of the structure. After reinforcement, gave the structure mechanical analysis, and obtains the conclusion: After reinforcement, the stagger degree of the structure's frequency and the source equipment's frequency is bigger than 20% (Structure's first frequency is 0.96Hz. Structure's second frequency is 0.99Hz), eliminated resonates response, and the level vibration displacement is only 1.1mm which satisfies the normal work request.Researched the dynamic characteristic of the workshop from four aspects: (1) Dynamic elastic module influenced structure dynamic characteristic, which was researched from obverse analyzing and reversed analyzing,and gave this workshop's elastic mold size 3.037E + 10 by reversed analyzing.(2) Damping influenced structure dynamic characteristic. (3) The structural arrangement and the component section size influenced structure dynamic characteristic, divided four kind of plans, and obtained the conclusions: the column plan enhanced the workshop's overall rigidity; and the beam plan restained the floor's local vibration, especially the high frequency vibration. (4) The earthquake function influenced the workshop structure, and by the earthquake resistance distortion checking: the structure overall reverse effect is not obvious, but the displacement between elevation 14.900m and 12.500m is oversized. |
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