Research On Structural Vibration Analysis And Reduction For An Internet Of Things Chassis Equipment

Internet of Things(Io T)chassis equipment is the core part of Io T system,and its reliability and stability determine the development of Io T.Subject to operating conditions,these devices often operate in harsh temperature or vibration conditions.Vibration,especially fundamental vibration,may cause contact looseness,open circuit or other contact problems which account for a significant proportion of the causes of system failure.Because of the complexity of the chassis structure,vibration analysis of individual internal components does not solve the vibration problems encountered during system operation.Therefore,system simulation and experiments need to be used to monitor and enhance the health of the structure.In this paper,a certain type of Io T chassis equipment was taken as the research object.Based on the two methods of experiment and finite element simulation,the dynamic characteristics of natural frequency,mode shape and harmonic response were analyzed from components to systems in turn.According to the analysis results,the weak points of the system were found out,and the improvement measures were put forward and verified.First of all,to the actual three-dimensional physical model of the chassis,according to the characteristics of the structure and the content to be analyzed,the model was reasonably simplified,unnecessary details and features were removed,the structure of screws and connectors were simplified and other parts of the heat sink and other complex structures were replaced by equivalent models to reduce the difficulty of subsequent calculations and improve the accuracy of the results.Then,the laser vibration meter was used to analyze the structure in sequence according to the order of assembly-semi-assembly-assembly.And the natural frequency and vibration mode of parts and assembly were obtained.Then the corresponding models were simulated by using finite element software ANSYS.Through the comparison of the natural frequencies and modalities of the components,the finite element parameters were adjusted to obtain the characteristic parameters of the materials and the contact stiffness between the components.By comparing the natural frequencies and mode shapes of the semi-assembly and the assembly with the harmonic response,the contact stiffness between the components.Finally,Taking the corrected model as the equivalent computing model of the equipment,the weak points in the chassis structure were found,the transmission path of vibration were analyzed,and the structural optimization measures were put forward according to the different vibration modes.The optimized equipment was tested and simulated,and the results showed that the optimization measures were effective.The analysis flow and method in this paper provide a reference for vibration and noise reduction of similar equipment.