Researches About The Dynamic Characteristics Of The Portal Crane's Boom System Based On The Lifting Loads

The portal crane's dynamic problem mainly studies a crane at start and make to move or other work appearances change suddenly the flexible vibration regulation of the system, on these grounds makes sure the motive of the system respond to. For portal crane, the boom system structure is a portal crane to work one of the most important loading partses, its mechanics function has direct influence to the normal operation of the whole machine. Because the crane follow high speed heavy carry direction of develop continuously, under the heavy complicated work condition to boom system structure analyzes power into the action characteristic be going necessarily, and the design calculation of the normal regulations usually is boom system structure resolve single a parts to carry on, making not a few simplifications and computing to the model of the parts the result can't reflect the comprehensive circumstance of the boom system structure. This thesis with portal crane boom system structure for research object, using finite element analysis and mechanism kinetics as theories foundation and analysis means, the usage parameter turns the technique and finite element analysis software ANSYS, facing each other the boom system structure the dynamic state characteristic of the system with while rising to rise process of the motive responded to carry on a research.The thesis chapter 1-3s introduce finite element analysis software ANSYS and finite element analysis theories knowledge and Combining related knowledge of the machine dynamics, the text introduces the configuration of the portal crane's boom system, analyzes its work principle. To build a jib structure's parameterized FEM model using ANSYS internal command-APDL and parameterized method. It is conveniently and quickly to modify and recalculate the model in FEM analyzing. The text carries on the static analysis under two circumstances: without goods load and with full loads. Then it analyzed the calculation results and got some useful conclusions.The thesis chapter 4-6s study the jib structure's dynamic characters. To program acommand stream file (*.log) that is available to any luffing location, gain the severalformer natural frequency and mode shapes, and finally analyze the results. At the mold analytical foundation up aim at the arm under the system work condition that rise and make to move of move and carry the lotus built up the mechanics model, computing to move a concrete expression type of carry the lotus, To study the dynamic respond while load lifting suddenly. To program a command file of transient analyze that is also available to any luffing location, obtain the dynamic response results including simulation nephograms of dynamics stress and displacement and curve of dynamic stress of representative nodes.