Research On Dynamic Simulation And Performance Of Chandelier Lampshade Molded Cushion Packaging Products

Molded cushioning products account for a very large proportion in cushioning package.In the product development process,it is often necessary to repeatedly modify the design program,and do lots of verification tests to achieve best results.At present,the research of molded pulp products has achieved some results.However,The design methods of molded product structures are still in the stage of experience design,and we can't predict quickly whether the structures of products meet requirements of anti-vibration and buffering during use,so there are long design cycle and high cost resulting from blindness in product design,mold design and process selection.In view of the above problems,this paper takes the molded pulp cushioning package of chandelier lampshade as the research object to discuss its dynamic simulation method and performance,which provides ideas and methods for the design and manufacture of molded cushion packaging products.According to the test method of mechanical properties of pulp molding material,the values of material density,yield stress and elastic modulus were achieved.Based on ANSYS software,the drop simulation and random vibration simulation of the molded pulp cushioning package of chandelier lampshade have been studied by the finite element analysis method.In the drop simulation of packages,taking the drop-impact as the environmental load,the simulation of drop height value of 1 000 mm was carried out by ANSYS/LS-DYNA software to obtain dynamic characteristics of the stress and strain nephogram,acceleration response curves and other related parameters of chandelier lampshade package in the paper.The characteristics and related parameters are compared with the dynamic characteristics such as the stress and strain nephogram obtained by the lampshade drop alone and the data of actual drop test of package,which verify the reliability of the simulation results and the rationality of structure of molded pulp products.The maximum stress value caused by the alone fall of the lampshade is 28.0105 Mpa higher than the maximum impact stress on the fall of the lampshade with cushion,which indicating that the molded pulp cushion plays a good cushioning effect during the fall of the product and prevents effectively the product from damage during the fall process;The waveform curves of experiment and simulation are basically coincident,so the finite element simulation is reliable for solving the drop impact problem of the package.In random vibration simulation,the paper firstly uses the acceleration collector to collect the value of random vibration excitation spectrum,and then modal analysis of chandelier lampshade package was carried out by ANSYS software to obtain natural frequency and modal shapes of package in the paper.The random vibrational road excitation spectrum was applied to package of chandelier lampshade to obtain the stress and strain nephogram,acceleration power spectral density response curves and other related parameters of package in random vibration simulation,which is to analyze the rationality of structure for chandelier cushion and product protection.The actual random vibration experiment is to verify the reliability of simulation results.The stress value of the lampshade is far less than the maximum yield stress value of the lampshade material which can withstand 75 MPa.The lampshade is well preserved,so the strength of the molded pulp cushion meets the requirements of protected product;The results obtained by the finite element analysis are consistent with the measured results.The finite element simulation is reliable to solve the random vibration problem of molded pulp cushioning products,which applies to study of the performance of similar cushioning products in dynamic environment.It provides an effective method of analysis for predicting the performance,structural design and optimization of cushion packaging products in the condition of random vibration.