How realistic is the laboratory simulation of the vibration regime in a missile free flight?

摘要

The vibration regime in a missile during free flight is complex, andrnnon-stationary both in level and spectral content. According to the currentrnmethodology, laboratory simulation of this vibration regime is in terms ofrnPower Spectral Density (PSD). A "white noise" like PSD must is requiredrnat forward and rear stiff locations of the free-free mounted missile.rnApplication of the tailoring principles promoted by MIL STD 810 startingrnwith its D version and continuing till today through the G version, revealsrnthat use of the constant spectral shape "flat" PSD, is not representative ofrnthe real life non-stationary vibration regime. A much more realisticrnmethod is the use of the measured time history. The need for arnmethodology that permits an evaluation of the equivalence between thernlaboratory simulation and the field conditions has been identified. Resultsrnof the work invested in answering to this need are also presented in thernpaper. Use of the comparison of spectral matrices, of changes in thernfrequencies of the main frequency bands, of comparison betweenrnprobability density matrices, of damage matrices and energy equivalency isrnpresented in the paper.