Ralfy
Aerospace
- Dec 1, 2003
- 3
Hi,
I have some background in vibration and usually use the damped single degree of freedom analogy to help understand and explain vibration analysis. I understand random vibration analysis and familiar with Miles Equation and its uses, however, I am faced with a problem where the inputs are a random vibration level in g^2 per hz (thats OK) and a sinusoidal input (in Gpeak). How do I combine or analyse the two together?
Some of my reading so far indicates that there is no real way of combining the two , but, some attempts are made to convert the sinusoidal to a random level (not strictly possible, I believe) and then the two randoms can be 'summed', say , using a fourth power rule, to arrive at a single random level in g^2 per hz, and the rest is a formality.
Looking forward to some direction.
I have some background in vibration and usually use the damped single degree of freedom analogy to help understand and explain vibration analysis. I understand random vibration analysis and familiar with Miles Equation and its uses, however, I am faced with a problem where the inputs are a random vibration level in g^2 per hz (thats OK) and a sinusoidal input (in Gpeak). How do I combine or analyse the two together?
Some of my reading so far indicates that there is no real way of combining the two , but, some attempts are made to convert the sinusoidal to a random level (not strictly possible, I believe) and then the two randoms can be 'summed', say , using a fourth power rule, to arrive at a single random level in g^2 per hz, and the rest is a formality.
Looking forward to some direction.
