The Simulation Of Laptop Drop Test

Laptop will inevitably drop or impact in daily use, which will cause serious structural or functional damage.So companies will do physical drop test to verify whether it meet the industry standards. The traditional physical drop experiment is difficult to control, and the measured quantities are limited.In order to reduce cost, shorten production cycle and improve the impact resistance, this paper use CAE technology carried out model analysis, drop test simulation and optimization deign.The main work and results can be listed as follows:1. Based on Hypermesh, the 3D model of laptap is simplied and the finite element model is established.Free model analysis and modal experiment are done. By contrast, the maximum error of natural frequency is 7.6% and modal shape is fairly consistent, so the reliability of the modal is validated.2. Accroding to collision theory, the simulation of laptop drop tests are done from 50 centimeters high, in different oritation, including angle drop, edge drop and face drop. The distribution of stress, strain, acceleration is obtained as well as the strength transmission.The maximum stress in each component is analyzed to determine whether it is beyond the yield limit.The result shows that angle drop is the mostdangerous drop condition.And the stiffness of the back structure is low and can not protect the LCD well, so it should be optimized.3.The drop experiment is done.The time history curve of acceleration is obtained both from the experiment and the simulation.By contrast,the shape of the curve,the value of the maximum acceleration in x,y,z axis are most same.The error is allowable,which verify the effectiveness of the drop simulation.4. Based on the results of the modal analysis and drop test simulation,this paper propose 3 optimization plan towards the back structure. 1.Optimizayion of the case structure material;2.Groove design in back;3.Topology optimization of the cornerof back.Final optimization results of reconstruction model show that the maximum stress in back, front, LCD bracket, and LCD is significantly reduced. The anti-dropping capability of laptop was improved.