Howtosignalprocessing
- What is sine sweep vibration test?
- What is sweep rate in vibration test?
- How to determine natural frequency and resonance experimentally?
- How is grms calculated?
What is sine sweep vibration test?
A sine vibration test exposes a device under test (DUT) to a single frequency sine tone at a defined amplitude and time. There are several different ways to conduct a sine test. An engineer may run a sine sweep to expose the DUT to a single sine tone with a frequency that is varied across a specified range.
What is sweep rate in vibration test?
The sweep rate determines the speed at which the controller increases or decreases the frequency. It is measured by the frequency range covered per unit of time. The sweep rate can be either linear or logarithmic.
How to determine natural frequency and resonance experimentally?
We need to positively identify the natural frequency by performing at least two different tests such as impact test, coast down peak hold, coast down peak phase or impact test using a force hammer. Once the resonance is confirmed, either change the mass or the stiffness of the equipment to change its natural frequency.
How is grms calculated?
Grms: Grms is used to define the overall energy or acceleration level of random vibration. Grms (root-mean-square) is calculated by taking the square root of the area under the PSD curve. Kurtosis: Fourth moment of the Probability Density Function (PDF).
