An Experimental Comparison of the Effects of Random Motion Vs Sine Wave Motion on an R.C. Oscillator and Q Multiplier Mounted on (1) a Damped Core Deck (2) a Hard Core Deck

摘要

For the damped core deck mounted electronic circuit it is concluded that random motion of flat acceleration spectral density over the frequency band from 20 to 1500 cps and of 100 cycle bandwidth centered about the oscillatory frequency of the electronic circuit, create the same frequency shift as sinusoidal motion at the oscillatory frequency when the root mean squared acceleration due to the three types of motion is equal at the supports. However, during such motion, the energy dissipation at the center of the deck is much less than at the supports. This indicates an energy absorption capability of the Saran rubber core in the deck. Furthermore, the rms acceleration at the center due to sinusoidal motion is less than that due to the narrow band motion. For the hard core deck mounted electronic circuit it is found that a correlation exists between wide band random motion and discrete frequency sinusoidal motions. This correlation is based on equal frequency shift for equal power inputs at the ends of the deck and is illustrated. The interesting aspect is that the rms acceleration at the center of the deck to such power inputs at the ends is almost the same for the two types of motion (random and sinusoidal). This contrasts with the findings for the damped core deck system. (Author)