Application Note: Automotive 3D Dynamics
•Application Note: Automotive 3D Dynamics
The suitability of the PSV 400-3D for data acquisition in car body modal testing has been studied in a real-world test on a car body at DaimlerChrysler in Sindelfingen, Germany. The results are very positive. The PSV 400-3D presents a huge potential for time saving as compared to accelerometers. It furthermore shows all the known advantages of laser scanning vibrometers, such as high point densities, non-contact measurements and ease of setup. This article contains the description of the measurements and their results.
High-spatial resolution structural dynamics tests on car bodies are usually a time-consuming and cumbersome task if performed with accelerometers. Accelerometers have to be carefully mounted, connected to the data acquisition front-end and their angular orientation has to be determined. Furthermore, for high spatial resolution tests, a very large number of accelerometers has to be employed. This is practically impossible in a single setup as the front end has only a limited number of channels. Therefore, only a subset of all measurement points is taken in an initial run, with dummy masses on the non-used points. In the next run, the accelerometers are moved to the next segment. This process is time consuming and accelerometers are often damaged. Furthermore, cabling, labeling and error checking gets very tedious when using many accelerometers.
A final drawback is the change in mass distribution of the measurement object introduced by the mounted accelerometers and the dummy masses.
Due to its non-contact measurement principle the PSV-3D has the potential to considerably simplify the setup, speed up the test enormously and to enable tests with high spatial resolution without altering the mass or stiffness of the measured object.
SOURCE: Polytec
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•Application Note: Automotive 3D Dynamics