Abstract: The dynamic load transfer characteristics of two typical threaded connections under low
speed impact are studied. Impact test of MIPS (muti-directional impact protection system) was
completed to obtain impact and response signal of the system. The signal was analyzed in time
domain and power spectrum analysis by MATLAB. The result shows that the damping effect of the
structure A is larger than that of the structure B, and has a certain damping effect on the impact system.
The resonance frequency of the structure B is obvious, and the resonance amplitude is high. It is not
applicable to the impact structure. This difference has a guiding significance for the design of the
connection structure. The functions of the signal transfer of the two structures were identified by the
MATLAB function recognition tool. The transfer functions were optimized by appropriately
increasing the number of zero/poles. The optimized functions were tested by experimental data,
which showed that the optimization method can effectively improve the system fitness. The
optimization method is of guiding significance for the design of other structural control systems.

Key words: MATLAB simulation, dynamic load transfer characteristics, thread connection, function
identification, impact