Reduced Scale Similar Design Method And Experiment Of Major Equipment Bolted Flange Components

With the development of social economy and the demand of state-building, the industry of mechanical equipment is playing an important role in China. Major equipment becomes more and more important. Bolted flange structure is a common component in major equipment, and the well mechanical properties are an important guarantee for the work of mechanical equipment. However, it is difficult to make experimental study directly since the structure is very enormous and often works in complex conditions. If a reduce-scaled model based on similarity theory can be designed, it will give some guidance to design prototype and save a lot of human, material and financial resources. Therefore, it of great significance to research the method to design a reduced scale bolted flange structure model of major mechanical equipment.The specific work and main thesis of the paper are as follows:1. Based on mechanical characteristics of TBM cutterhead bolted flange structure in the actual work condition, the conclusion is obtained that axial stiffness is an important manifestation of the mechanical properties of the structure, so this paper mainly studies the similar design of bolted flange axial stiffness. Considering the number and preload of bolts, a simplified model to calculate axial stiffness of bolted flange structure is established. Furthermore, through the finite element method, the half cone angle is the important influence factor which affects the axial stiffness.2. Main parameters which affect structure axial stiffness are selected based on similarity theory. The similarity analysis of the axial stiffness was carried out by the control variable method. And then the effect on axial stiffness similarity of bolted flanged component of bolt selection, number of bolts, geometry similar size ratio and preload is analyzed. And the design parameters of reduced scale TBM cutterhead bolted flange structure are obtained.3. In order to verify the feasibility of reduce-scaled design method based on similarity theory and analysis the effect of different factors on axial stiffness of bolts, the similarity test of flange stiffness is designed and the axial tensile and compressive stiffness of prototype and model are measured.4. Applied the reduced scale design method to the design of reduced scale TBM cutterhead model, the similar parameters collection of material, geometry, load and dynamic quantities of TBM cutterhead is constructed by analyzing the inner connection between the real TBM cutterhead and model experiments. Then, the design parameters of the test bench are acquired. Finally, the dynamic characteristic similarity of reduced scale cutterhead model is verified through dynamic simulation.