Analysis objects are artificially excited to determine the vibroacoustic characteristics such as the degree of absorption, reflection or transmission. The transfer functions are derived from the ratios between the response signal and excitation signal. Typical forms of excitation are:
- Shaker excitation;
- Impact hammer excitation; and
- Airborne sound excitation.
Animation of Deflection Shapes
Another important tool is the visualization or animation of the deflection shapes which can occur from throughput data or at selective frequencies. The animation of directly measured signals is referred to as an Operation Deflection Shape (ODS) analysis. However, transfer functions (normalized accelerations) or modal deflection shapes can also be animated.
Transfer Path Analysis
Response signals are usually composed of different sources or paths. Transfer path analysis (TPA) methods are used to examine this composition. Since the specific task or problem definitions can vary considerably, different TPA methods have been established:
- Mount stiffness method;
- Matrix inversion method;
- Operational TPA; and
- Sensitivity analysis.
Using the PAK software, the contributions of the path are synthesized in the time range, so that you can listen not only to the results but also to the single path contributions.