Research On Vibration Reduction Strategy Of An Industrial Plant Based On Equipment Disturbing Force

With the increase of multi-storey industrial plant,the use of power equipment upstairs has become the norm in modern industrial plant,which has produced important economic benefits.However,the slight vibration generated by the power equipment during long-term operation will cause damage to the structure,and even affect the production and make the structure crack;Serious may cause structural damage,collapse,resulting in serious property losses.The vibration of power equipment will not only cause the vibration of industrial plant structure,but also damage the physical and mental health of the staff and reduce the comfort of the staff.In this paper,starting from reducing the vibration of industrial buildings caused by the operation of power equipment,combined with the dynamic testing and finite element analysis of specific engineering,and based on the analysis of vibration transmission path,a new three-dimensional vibration isolation bearing is proposed as a vibration control scheme.The applicability and feasibility of the device are theory analysis,numerical simulation and experimental verification research.The main research work and achievements of this paper are as follows:(1)Conduct technical research on the structural damage generated during the operation of an industrial plant,and clarify the actual state of the factory building structure.In view of the strong vibration of the plant structure,a reasonable dynamic test scheme is developed.Based on the on-site vibration measurement data and the vibration limit requirements of the norms,the dynamic characteristics and dynamic response results of the plant structure are obtained through analysis.(2)The ABAQUS software was used for numerical simulation analysis of an industrial plant.The modal analysis and dynamic time history analysis results of the finite element model were compared with the measured results,verifying the rationality of the finite element model and the simplified equipment load model.The numerical analysis results are basically consistent with the on-site measured data,and the structural vibration characteristics are relatively consistent.Conduct a critical vibration transmission path analysis for an industrial plant.The results indicate that the transmission of equipment vibration in the structure is mainly based on the vibration components corresponding to the 12.16 Hz frequency band,with “equipment-equipment foundation-floor system” as the most influential vibration transmission path.(3)In response to the vibration isolation requirements of an industrial plant under equipment disturbance,a three-dimensional vibration isolation bearing was designed and processed,and the structural characteristics,working principle,and design theory of the three-dimensional vibration isolation bearing were introduced.The actual vibration test was conducted using a small screening machine equipment,and the acceleration time history of the column foot and the lower flange of the three-dimensional vibration isolation bearing of the screening machine equipment was collected and analyzed using a vibration pickup.The vibration test shows that in both horizontal and vertical vibrations,the peak acceleration transmitted to the lower flange of the three-dimensional vibration isolation bearing can be attenuated by more than 90%,and the three-dimensional vibration isolation bearing has a good three-dimensional vibration isolation effect.At the same time,the ABAQUS software was used to establish an overall model of the threedimensional vibration isolation support,and performance analysis was conducted.The research results indicate that the stiffness performance and safety intensity performance of the support meet the design indicators,and the simulated vibration isolation performance values are in good agreement with the experimental values.(4)Design a vibration isolation and reduction scheme for an industrial plant structure through numerical simulation.Explore the dynamic responses of structures under different isolation bearings,such as acceleration,1/3 octave,storey drift,storey drift angle,and isolation layer displacement.Compare the response differences between isolation structures and non isolation structures to verify the isolation and vibration reduction effect of three-dimensional isolation bearing.At the same time,this article provides the range of values for parameters such as frequency ratio and helical spring wire diameter that are suitable for this structure.