Research On The Vibration Control Of Mobile Station Test System With Single Degree Of Freedom Model

Mobile phone test station system is the core part of mobile phone manufacturing.As people have higher requirements for the performance of mobile phones,the test accuracy is required to be higher.And the mobility of test stations demand are increased,which brings great challenges to the development of mobile phone station test systems.Test instruments and shielding box are key parts of the mobile phone station test system characterized by high precision and susceptibility to interference from external signals.Based on current factory mobile phone testing conditions,the constant vibration of the test instrument will cause the antenna to shift,which will cause the power parameters failure to meet the requirements of the mobile phone agreement.According to the actual situation of mobile phone testing in the factory,this paper proposes a vibration isolator of the positioning platform based on the single degree of freedom model.First of all,the reasons for the failure of the mobile phone power test is analyzed.Through a large number of experiments,it has been proved that the vibration of the fan causes the test antenna shift by about 1cm,which makes the moving antenna cannot capture the required power at the correct angle and caused the test power of the mobile phone to fail.From the perspective of suppressing vibration,a design of a vibration absorber for mobile phone station test system based on single-degree-of-freedom model is proposed.By designing a vibration isolator between the test instrument and the base of the rack.The energy of the fan vibration is consumed in the form of a shock absorber,so as to reduce the impact force generated by the vibration.It achieved the purpose of vibration control.In order to obtain the optimal vibration reduction effect,based on the overall design idea,the precise requirements and low vibration requirements of the power test in the mobile station test system are converted into corresponding mathematical functions above.And the K and C of the damping element are determined.The adjustment time of vibration and the isolation rate are the optimization functions of the objective function.The differential evolution algorithm is used to solve the optimization problem,and the design of the spring and damping parameters of the vibration isolator in the station test system is completed.Finally,the designed vibration isolator is applied to the mobile phone station test system,and the antenna offset is controlled within 0.5cm when the fan speed of the test instrument is 3660 revolutions per minute.And the shock absorber remains stable during the vibration control process,the force fluctuation is very small,and there is no rebound force.After the successful introduction of mass production lines,the yield increased by 1.3%.The test system space occupancy was saved by 15%.This design has reached the setting expectations,which also provides a certain parameter and design reference for the vibration control of the mobile phone test station system.