Introduction to Modal Analysis:
Experimental study of the dynamic behavior of the structure is the main goal in modal analysis. Although significant progress has been made in the development of analytical and numerical methods in the field of vibration, experimental measurements are in many cases irreplaceable.
modal analysis purposes
1- measuring vibration specifications to find the response of the structure under actual operating conditions under various forces such as impact. These properties are:
- Natural frequencies of the structure
- Shape of structural vibration modes
- Damping coefficient
2- Comparing the results obtained from the above methods with the results obtained from finite element modeling, in order to measure the validity of the model and update the model (updating model)
3- Development of mathematical model based on information extracted from experiments.
Equipment
Several equipments are required to perform modal testing.
- Contact and non-contact (laser) accelerometer sensors
- Hammer
- Vibrators with frequency band and different excitation forces (Shaker)
- Analyzer
