What is Frequency Response Analysis?
Frequency Response Analysis looks at sine vibrations in a structure and the corresponding accelerations. Whereas Random Vibration is irregular, sine vibration is a regular, predictable sine-wave oscillation of a structure. Sine vibrations can occur due to such things as an electrical motor running, or perhaps due to a natural frequency being excited and sustained. Unlike random vibration, sine vibration can be directly measured for any frequency, since only one frequency occurs at a time (see Random Vibration Analysis for details). Using analysis, we can determine accelerations of any point on a finite element model. That information is in turn used to determine loads on components or on the entire instrument. Frequency response analysis uses the relationship between displacement and acceleration, i.e., acceleration is the second derivative of displacement with respect to time: That is, the acceleration equals the amplitude times the frequency squared (where the frequency is in radians
