The work aims to deeply explore the dynamics of the universal inertial switches.The relevant mathematical model was deduced and the uniform acceleration sensitivity of the switch was calculated according to the model structure and the motion state.On the basis of the sensitivity,the overload was applied to observe the dimensional tolerance of key compo-nents and the effect of the prepressure setting of the spring on the motion state and the comparison simulation method of MATLAB and ADAMS was used.The key variable decisive for the outcome of the motion was the prepressure of the large and small springs.In view of the effect of the tolerance of key parts,according to the simulation and theoretical calculation,when the axial overload was applied,the effect percentage of large spring and small spring was 53.09%and 18.32%,respectively,and the effect percentage of small ball+rod and small ball was 10.39%and 1.98%,respectively.The effect of the size tolerance of the spring was about 5.11-9.25 times the effect of the size tolerance of the electrical structure.When the vertical axial overload was applied,the effect percentage of the large spring was 0.81%and that of the ball+rod was 3.49%,and the multiple relation-ship was 4.31 times,but the impact percentage was small.The tolerance of the large spring has the most effect,followed by the small spring,then the size tolerance of the ball,and finally the size tolerance of the rod.According to the model structure,the general rule of the key variables of the spherical universal inertial switch was deduced.The mechanical effect of the components supporting the internal electrical structure affects the most,followed by the size of the electrical structure.
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