Research And Experiment On Vibration Isolation Of Household Electronic Products

With the continuous promotion of "Made in China 2025" and "Internet +" action guidance,the explosive development of electronic products represented by household appliances and consumer electronics.At the same time,for household appliances and other electronic products in the transport process of protection standards are becoming more stringent.However,in the process of product transportation,the vibration of packaging parts caused by uneven road surface and inherent vibration of the engine will cause external damage to the products or the failure of internal electronic components.Therefore,in order to reduce the possibility of product damage and reduce the economic loss caused by improper packaging during transportation,it is necessary to optimize the packaging of household electronic products.First of all,this paper took EPS foam as the corner pad material,through experiments to determine whether the parameters such as density and thickness would affect the vibration isolation and buffering effect,and obtained the parameters of EPS foam material with the optimal buffering performance,and designed the optimal vibration isolation packaging system based on these parameters.An effective vibration isolation packaging for household electronic products was developed.Secondly,after the establishment of the dynamic model of household electronic products,the effect and damping of the cushioning materials in the vibration isolation and buffering packaging system on household electronic products were equivalent to the spring stiffness coefficient and damping coefficient of the foam corner cushion arranged on the product at 8 angles.In order to make the analysis and calculation easier,the 8 stiffness coefficients and 8 damping coefficients were orthogonal decomposed along the x,y and z axes respectively to obtain the stiffness coefficient of 24 springs and the damping coefficient of 24 cushioning materials.Then,the equivalent model size of household electronic products was set.In view of its characteristics in the transportation process,it was divided into linear and nonlinear cases for discussion.The dynamic differential equations of linear and nonlinear six degreeof-freedom vibration isolation systems for household electronic products were derived by using the law of conservation of energy.For the linear system,without considering damping,the total kinetic energy of the vibration isolation system was obtained,then the total potential energy of the system was obtained,and the derivative of the total energy of the system was obtained,which was decomposed into a dynamic differential equation in the direction of six degree-of-freedom.For the nonlinear system,the total kinetic energy of thevibration isolation system was obtained,then the total potential energy of the system and the internal energy generated by the damping of the buffer material were obtained,and then the total energy of the system was obtained and the derivative was taken,that is,the dynamic differential equation of the nonlinear vibration isolation system with six degree-of-freedom was obtained.Next,six degree-of-freedom was derived based on the linear dynamics differential equation of vibration isolation system,the setting of products and various parameters were obtained by experimental study of angle of EPS foam pad size parameters of the buffer parameter,and the computer simulation by MATLAB,get the direction of six degree-of-freedom corresponding response acceleration excitation images.Equivalent test rig was designed and produced,and its size and centroid position,the spring stiffness coefficient agree with computer simulation,such as the translation along the y direction,for example,the connection INV9822 A type piezoelectric acceleration sensor,Coinv DAPS V10 signal acquisition software was developed for the determination of the six degree-of-freedom linear vibration isolation system in the y direction vibration response,and got the vibration curve and its peak acceleration.The results shown that the relative error is 13.7198%,which was within the allowable error range.Finally,six degree-of-freedom was derived based on the nonlinear dynamic differential equation of vibration isolation system,damping and the mass center position were not considering geometric center,set each parameter,the nonlinear differential equations were derived by computer simulation,got the direction of six degree-of-freedom corresponding response acceleration excitation images.Equivalent test rig was designed and produced,and its size and centroid position,the spring stiffness coefficient agree with computer simulation,such as the translation along the y direction,for example,the connection type INV9822 A piezoelectric acceleration sensor with Coinv DAPS V10 vibration signal sampling system vibration response,the acquisition of six degree-of-freedom nonlinear vibration isolation system in the y direction vibration response,and got the vibration curve and its peak acceleration.The results shown that the relative error of the two methods was 11.7068228%,which indicates that both the dynamic equation and the simulation result were credible.Therefore,the six-dof vibration isolation system model and theoretical calculation method established in this paper had practical significance for the protection of household electronic products in the transportation process.