ABSTRACT
Random vibration studies are resource intensive and can easily be misconfigured, so a static representation is valuable for a quick-turn yet conservative alternative. The response levels could be used to analyze the stress in brackets and mounting hardware, for example. Of the three motion parameters describing a shock spectrum, velocity is the parameter of greatest interest from the viewpoint of damage potential. The reason is that the relationship between the relative displacement and the response acceleration for a multi-degree-of-freedom or continuous system is complex. Furthermore, Miles’ equation is an approximate formula that assumes a flat power spectral density from zero to infinity Hz. As a rule of thumb, it may be used if the power spectral density is flat over at least two octaves centered at the natural frequency.
