Research On Dynamic Characteristics Of Mold Vibration System Of PC Production Line With Considering Joint Interface Factor

Concrete vibration compaction is an important part of the PC(prefabricated concrete)production line.As a vibration-compact carrier for concrete,the mold vibration system directly determines the vibration compactness and uniformity,affecting the dimensional accuracy and mechanical properties of the concrete prefabricated components.It is vital that reasonably design the mold vibration system scheme and set the parameters of reasonable working conditions to make it have good dynamic characteristics.In order to improve the vibration stability and uniformity of the mold vibration system,considering the influence of the interface factor on the adjacent amplitude difference of the vibration subsystem and using theoretical and finite element simulation methods to analyze the dynamic characteristics of the mold vibration system.According to the existing structure scheme of the mold vibration system for the in-line shaking table,lead into the joint surface characteristic analysis method to analysis the movement trend between the vibration subsystems.Through the static analysis of the key bearing components,the pressure range of the two joint surfaces was determined.The mold vibration system was discretized into a four-degree-of-freedom series vibration system and established the theoretical model.The theoretical model was solved based on Simulink.The variation law of the displacement response amplitude of each vibration subsystem with the surface pressure was studied,and the adjacent amplitude difference of the vibration subsystem was summarized.Finally,selected the reasonable operating conditions.Based on the Workbench,finite element modeling of the mold vibration system was performed.The modal and harmonic response analysis of the mold vibration system considering the factor of the joint surface was compared to observe how the dynamic characteristics changed.Verified that the excitation force frequency was in the resonance region.Compared the displacement response amplitude theory of each vibration subsystem and the error of the simulation calculation result,and analyze the error source.Selected three groups of joint surface pressure values when the amplitude differenceof the vibration subsystem was relatively small as the working condition parameters to perform the production of prefabricated concrete components.And the dimensional measurement and load test of the concrete were performed to obtain the dimensional accuracy and loading of the components.During the process of cracking load,maximum deflection,maximum bearing capacity,to determine whether the vibration was stable and uniform in the vibration compaction process of the concrete,and to verify whether the dynamic characteristics of the mold vibration system meet the production requirements,which provided reference for setting reasonable operating parameters in the production of prefabricated concrete components.