Study On The Coupling Vibration Between Hoisting Systems And Well Tower Structure

The mine hoisting system is an important equipment which links underground andfloor. The mine hoisting system can produce intense vibration effecting to the vicinalfloor or total well tower structure during startup operation, and inversely the vibrationof the structure can also arose the vibration of the hoisting equipment. Hence, thevibration of the well tower structure and power equipment is inseparable. As most of thecoal mine well tower structures in our country were built in the last century, bigvibration problems are existed in many tower structure and hoisting system, more anduncertainty disturbing source has become a research difficult of the coupled vibrationproblem. The dynamic testing method is mainly used to measure the vibration of floorand equipment and certain corresponding assessments of the security are given based onvibration intensity index. The researches on vehicle-bridge coupling vibration have beenrelatively mature at home and abroad. However, because of the complexity of welltower structure-hoisting system and uncertainty of coupling surface, it is rarely reportedto simulate the coupling vibration of structure-hoisting system by using dynamicemulator software.The various kinds of modeling methods of flexible body are compared andanalyzed and a scheme of bushing modeling is summarized in this paper. The model ofwire rope is established using macro program by setting the bushing stiffness, dampingand some related contact parameters. In addition，in view of the particularity of towerstructure, the floor and beams of eighth layers are considered individually as theresearch object and the structural model is established by Solid Works software. Thenthe structure model is imported into ANSYS and meshing is taken. Some external pointsare created so that the external point of freedom of the nodes on the model can becoupled to generate modal neutral file. The model of machinery and equipment built bySolid Works and the modal neutral file of structure are imported altogether into theADAMS and the model of structure-hoisting systems is established by adding someconnectors.The rotation of roller is periodical, that is consists mainly of three stages ofacceleration, constant speed and deceleration within a running period. A step function isused to define the time-history relationship of angular velocity of the motor shaft. Timehistory curve of measuring points of floor and machine at full speed and half speed condition is analyzed. It is found that the machine areas closer to the hole of floor, thegreater the vibration intensity. However they are all within the allowable range. Thevibration intensity at full speed is bigger than that of half speed. The vibration intensityof equipment is less than the allowable value. By comparing the results of softwaresimulation with field test, the trends of the image are consistent. In the speed-up stage,the vibrating response begin to increase，then gradually approaching stable in uniformspeed stage while decays in slow down stage, which prove the feasibility of the methodpresented in this paper. However, the results of field test are greater than that ofsoftware simulation, the main reason is that the results of field test are produced bymany kinds of vibration sources.