Dynamic Analysis And Research On Vibration Control Of Transport Corridor Structure

Belt Transport Corridors are the main structures supporting rubber belt conveyor. At present, with the belt conveyor widely used in the industrial transport field, long distance, high-speed, large-capacity, high-power. Corridors structure became big span and super length structure. Corridors structure become increasingly sensitive to the vibration force, and vibration problem exposed. Vibration problem of corridors in industrial transport is an important and urgent problem to be solved. However, due to the particularity of Industrial belt corridors structure in China, it has not system research results to refer in the design of newly-built structure or in the reinforcement and maintenance of existing structure. In the paper, the author take the example"B418"corridor as a start point together with the dynamic test and the dynamic structure numerical analysis, and then proposed vibration control scheme and structure design suggestions. Mainly do the following areas:(1) After the field investigation and structure dynamic test, author acquired the actual dynamic response of corridors in "GHJ - 4 " and "GHJ - 5" structure's midspan and support. Through analyzing the response curve professional analysis software called"DASP", we obtain the dynamic basic parameters and dynamic response peaks. The results show that the displacement and acceleration of the normal operation are in security, start-up maximum vertical acceleration is in the range of affecting the safety of the structure, and start-up longitudinal and vertical acceleration are greater than normal acceleration in operating.(2) Induct various load on structure, and check the structure's carrying capacity with the existing rules. And compare the theoretical calculation result with dynamic testing calculation results. The results show that the theoretical calculation can satisfy request of structure bearing capacity, but also there have found that structure is in larger vertical vibration. It means that the existing structure calculation method cannot satisfy the needing in structure calculation under the dynamic load. Power effect should be considered when design structure.(3) To find out the problems of vibration excitation and the vibration excitation force, establish the overall structure and the "GHJ - 4" structure analysis model, and run the modal analysis and the steady-state analysis. And then compare the practical test result with the theoretical model analysis results. The results show that longitudinal vibration is mainly from the belt acceleration in activating, and the main reason of vertical abnormal vibration is mainly produced by the roller's eccentric excitation and corridors vertical resonance.(4) To control the abnormal vibration, the article puts forward five kind of structure optimization schemes and carry out corresponding analysis. Then compare the superiority and feasibility of each scheme. At last, puts forward references in the existing structure reinforcement and new project design.