| Articulated resonance road crusher uses resonance system equipped on the front frame to knock the cement pavement with the frequency of close to the natural frequency of cement concrete pavement based on the resonance principle,which is with high efficiency of reconstruction of cement concrete pavement.This thesis comes from the school-enterprise cooperation projects and the research object is the front frame of articulated resonance road crusher.This thesis makes the finite element static analysis and dynamic analysis of the front frame of articulated resonance road crusher to evaluate its performance and carries out structural optimization of the front frame according to the problems in the analysis results.The main contents of the paper are as follows:1 Firstly,the working principle and the structure of the front frame of the crusher are introduced.Then the finite element model is built according to the structure characteristic of front frame and the model is based on surface cell,including the body cell.2 Static analysis of front frame: At first,the basic theory of static analysis is described.Then two kinds of analysis conditions,the lifting condition and the working condition of the resonant system,are determined according to the stress characteristics of the front frame.The maximum stresses of the two conditions are224 MP and 284 MPa,and the maximum displacements are 8.275 mm and 3.52 mm according to the analysis results.It shows that the design of the front frame meets the structural strength stiffness requirements,and there is a certain optimization space.3 Dynamic analysis of front frame: Firstly,the modal analysis of the front frame is carried out,and the fourth order frequency 42.27 Hz and fifth order frequency46.11 Hz are close to the crusher common operating frequency 45 Hz.According to the results of frequency response analysis,the displacement response of the reference points is larger than that of the fourth order frequency and the fifth order frequency,showing the fourth mode and fifth mode have a relatively great impact on the dynamical performance of the front frame.According to the results of the transient analysis,under the excitation of 45 Hz,the structure is with the large amplitude vibration.Above all,the dynamic performance of the front frame is not good,and the structure should be optimized to avoid the working frequency of the crusher at utmost.4 Size optimization of dynamic performance of front frame: Firstly,thesampling range of the thicknesses of 14 plates which is composed of the front frame is determined and the design of experiment is carried out base on the Latin hypercube sampling.Then 10 plates with high influence of 4th and 5th order frequency have been selected based on the results of the main effect analysis and the response surface of the thicknesses of the 10 plates and the 4th and 5th order frequency have been built by Kriging interpolation.And the genetic-gradient hybrid algorithm is used to complete multi-objective optimization of the 4th and 5th order frequency.The 4th order frequency is reduced to 39.86 Hz,by 5.70%,while the 5th order frequency is increased to 52.37 Hz,by 13.58%,which effectively avoids the working frequency of45 Hz.The work of this thesis shows that preliminary design of crusher's front frame should be further improved and the size optimization of the front frame based on design of experiment achieved good optimization effect,which verifies the feasibility of this paper and provide reference for the follow-up work. |
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