Study On Vibration Control Of Some Large Equipment Engineering Structure

Structural vibration control is not only a frontier of civil engineering,but also the interdisciplinary field of science and technology.How to minimize vibration damage caused by earthquake and explosion shock is an important problem the human must solve.On the premise of considering the earthquake and explosion shock,analyzing some specific objective and designing a set of vibration control scheme to meet the requirements of damping vibration have significant practical significance.This paper presents a overall scheme,designs some subcomponents of the vibration control system and analyses parameters of numerical calculation of vibratory response to meet the requirements of damping vibration of some large equipment.A overall scheme of the SMA damper-ball system-suspension system is presented.This scheme can block and dissipate the vibration energy,limit displacement of vibration and reset the position after vibration.Subcomponents including the self-settable universal damper,the self-settable heavy damping vertical absorber,suspension system and the ball system are designed.Based on vibration theory,this paper discusses the structure of subcomponents,working principle,function and the calculation model.Based on the platform of the large general finite element software ANSYS,the overall scheme of the SMA damper-ball system-suspension system is analyzed under either horizontal vibration or vertical vibration.Study shows that adopting the overall scheme the first two order modes of the system translate from bend into translational motion,and the first order frequency reduce from 0.6Hz to 0.13 Hz.Orthogonal parameter analysis results show that rolling friction forces play a role of controlling the horizontal acceleration of equipment pedestal,and the displacement between equipmentpedestal and the ground is strongly associated with damp and total stiffness.When the radius of lower SMA wires increase,the vertical acceleration of equipment pedestal increase compared to displacement between equipment pedestal and the ground decreased.When the lengths of SMA wires increase,the vertical acceleration of equipment pedestal decreased compared to displacement between equipment pedestal and the ground increase gradually.On the basis of parameter analysis,the optimal parameter combination of the overall scheme is determined,and the vibration response under types of earthquake excitation and blast vibration are calculated.The results show that the overall scheme can satisfy the demand of controlling vibration response of the large equipment.