Modal Analysis
The process of determining a set of generalized coordinates for a system such that the equations of motion are both inertially and elastically uncoupled. More commonly, it is a process of determining the natural frequencies, damping factors, and mode shapes for a structure. This is usually done either experimentally through frequency response testing or mathematically using finite element analysis.
- Excitation techniques
- Mechanical
- Hammer or impacting device
- Easy to use
- Control of force pulse difficult
- Electrohydraulic
- High forces
- Low frequency only
- Very high harmonic distortion
- Equipment is heavy
- Electrodynamic
- Wide range of forces
- Wide frequency range
- Low harmonic distortion
- Equipment is portable
See also: Circle Fitting, Mode Shape, Natural Frequency, Real Modes, Vibration.
Subjects: Noise & Vibration