Dynamic Load Tests And Numerical Simulation Analysis Of A Coal-conveyer Trestle

Coal-conveyer trestle is widely used in industrial transportation, because it has a lot ofadvantages which include low investment costs, continuous production and high degree ofautomation. In recent years, with the soar of the extractive industries and manufacturing inour country, long-distance and high-belt-speed, large-capacity, large-power belt conveyor areput into use. As the main carrier of the belt conveyor trestle, the corresponding also towardsthe direction of large span and super length, due to the quality of light and large bearingcapacity, the steel structure is the only optimum structure form. Problems associated to,however, small stiffness and light quality make its reaction is very sensitive to vibration, thisproblems has not been solved in engineering design, and even has never been considered bydesigners. The vibration problems will not only reduce the homework personnel’s comfort,impair the health of human body, but also influence the bearing capacity, additionally, thevibration to some extent lead to fatigue problem. So the research of vibration problems of belttype conveyor trestle has become a new direction.The research objects of this article is the coal-conveyer gallery of the3th loading point tothe4th loading point, and mainly test the dynamic performance and dynamic response. Inorder to understand the structure of the vibration characteristics more, use the finite elementanalysis program for simulating its dynamic characteristics and dynamic response analysis. Test and numerical calculation results show that the vibration of the structure vibrationresponse surpass the allowable values, thus we can put forward some measures of vibrationreduction to control the structure of large displacement response, structure’s vibrationdisplacement amplitude decreased obviously after the reinforcement, the reinforcement effectis good.In dynamic performance test, it mainly tests the structure on the dynamic characteristicsand dynamic response under different working conditions. Through the analysis of dynamicproperties of the test structure, to obtain the natural frequency of vibration and forcedvibration frequency. Through dynamic response analysis, not only can accept all the points inthe response amplitude under different working conditions, but also can indirectly determinethe excitation characteristics of structure under different conditions. In dynamic characteristic analysis, established the structure based on the space finiteelement model and then simplified. Considered adjacent piers and trestle scaffold influenceon structure, through the modal analysis of the large span coal conveying trestle modalinformation, including modal type, the modal frequency and the quality of each order modalparticipation factor.Finally, in the dynamic time-history analysis, it simulated the actual vibration condition,and puts forward three kinds of vibration control scheme. Through calculation analysis andcomparison, combined the two methods which add poles and enlarging top chord and bottomchord members’ section, the vertical vibration displacement of structure has played a verygood effect of control, to provide some reference for existing pier vibration control andconstructing pier structural design.