Technical Paper
3-D Scanning Vibrometry Enables Efficient Experimental Modal Analysis of Large and Complex Structures for NVH-Optimised Vehicles
2007-01-17
2007-26-034
In the design and development of modern cars with respect to comfort, silence and safety, state of the art experimental modal analysis is one of the essential development tools. Due to the large amount of degrees of freedom of such a large and complex system like a car with all its components, a complete simulation by FEM can not be realised easily and requires an enormous expenditure of work and calculations. In addition the simulations are based on assumed system parameters and thus the vibration behaviour of the resulting prototypes often is not completely identical to the simulated model. In contrast to conventional measurements with accelerometers, the 3-D Scanning Vibrometer enables fast and efficient non-contact measurements of the in-plane and out-of-plane vibration behaviour at all optical accessible surfaces. The method easily allows to increase the number of measured points to obtain a high measurement point density.