| Stacker is the key equipment to realize the three-dimensional flow of goods in the three-dimensional warehouse.The light stacker has the advantages of low energy consumption and convenient transportation,and currently has advantages in the market.Due to the advantages of compact structure,light weight and narrow floor area,the single-column roadway stacker is gradually popularized and applied in the automated three-dimensional warehouse.However,the lack of structural rigidity and strength often affect the working performance of the whole machine.Therefore,under the premise of ensuring the performance of the stacker,the lightweight optimization design of the whole machine has gradually become an important factor for engineers to consider.Taking the stacker as the research object,according to its size and complexity,it is necessary to find a suitable optimization method and a suitable research platform to complete the lightweight optimization design for the development of the stacker.This article takes the single-column roadway stacker commissioned by an enterprise as the research object,and on the premise of ensuring the stability of the whole machine structure and the movement safety,carries out the lightweight research of the structure of the single-column roadway stacker based on the response surface method.The specific research contents are as follows:1)Through the parametric analysis of the developed stacker model,the structure of the column and the bottom beam in the stacker support frame is simplified and improved.The stiffness and deformation formulas of column and bottom beam under dangerous working conditions are established respectively,and the theoretical calculation of brace stiffness is completed.The accuracy of finite element simulation is verified by comparing the results of theoretical calculation and software simulation,and the preliminary inspection of stacker structure performance is completed.2)Based on the finite element analysis platform,the modal analysis of the improved stacker is carried out to obtain its natural frequency and the corresponding vibration mode,and check whether the resonance phenomenon can be caused by the excitation frequency caused by the track irregularity during the operation of the stacker;At the same time,the continuous dynamic characteristics of the structure are predicted by means of harmonic response simulation,and it is discussed whether the stacker can overcome the resonance and other harmful phenomena caused by forced vibration successfully On the basis of ModalAnalysis and Harmonic Response Analysis,the dynamic response of the stacker crane in the process of motion is discussed by using s-type speed control curve,by observing the amplitude of the whole machine and the phenomenon of derailment,the structure can run smoothly.3)Based on numerical modeling and Finite Element analysis multi-platform cooperation model,the integration of Stacker’s stiffness,strength and modal simulation model parameters is completed.Through experimental design,the response of stiffness,strength,low-order mode and overall mass is taken as structural load-bearing stiffness,strength,low-order mode and overall mass,and the functional relationship between input variables and response is obtained by taking size parameters as input variables,and the corresponding sensitivity values of each parameter are calculated.At the same time,response surface model is established and evaluated,and then multi-objective genetic algorithm is used to realize structural lightweight optimization design.Finally,dynamic performance analysis is carried out to verify the stability of the lightweight structure.The results show that the weight of the light-weight stacker is 13.67% lighter than the original structure,and its mechanical properties and low-order modes are improved.This optimization method can complete the lightweight optimization design of Stacker to a certain extent,which can be used for reference for similar structure optimization. |
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