Accelerate FE model validation and time-to-market
Experimental modal analysis (EMA) is the powerful method in automotive development to confirm, validate and correct (model updating) simulation results of a finite element calculation (FE model, FEM). Designing components based on a finite element model is an efficient way of shortening development times. But the feasibility of the resulting structural dynamic models needs to be assessed. Consequently, it is essential to perform the experimental modal test on prototypes so as to validate the models.
Design right the first time - here Scanning Vibrometers from Polytec speed up the process significantly. Non-contact measurement means zero mass-loading, so they do not influence the vibrational characteristics. The FE-like spatial data resolution or point density allows for performing modal analysis for higher modes and meaningful MAC analyses. Simply import the measurement grid from your FE model into the PSV software to use the identical coordinate system instead of interpolation. The virtually unlimited measurement points on your structure result in high spatial resolution, unlike conventional tactile methods like with accelerometers. Achieve high data quality even overnight – with the fully automatic RoboVib® Structural Test Station.
New vibrometer technology in practical testing
Frequency response function measurement using QTec® multi-path interferometry
Validating complex models accurately and without contact
The need to validate simulation models of complex mechanical structures has grown in importance for efficiency in the design process. This is especially true for non-linear structures (such as composite panels and jointed components) where it is critical to use an accurate full-field measurement method. This tutorial covers a how-to-guide and use-cases of Scanning Laser Doppler Vibrometry (SLDV) as a non-invasive technology to efficiently characterize critical mechanical structures. Read the full paper from the IMAC International Modal Analysis Conference.
Eichenberger J., Sauer J. (2022) Validating Complex Models Accurately and Without Contact Using Scanning Laser Doppler Vibrometry (SLDV). In: Di Maio D., Baqersad J. (eds) Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-76335-0_11
Related products
PSV-500-3D Scanning Vibrometer
The PSV-500-3D Scanning Vibrometer measures 3D dynamics in research and product development in a reliable and precise way. Its visible HeNe laser provides outstanding SNR on well-reflecting sample surfaces and is ideal for small samples and under water. The deflection shapes and Eigenmodes detected help you with everything from NVH, acoustic and structurally dynamic issues to ultrasonic analyses, FEM validation and non-destructive testing from DC to 25 MHz.
RoboVib
By combining a 3D scanning vibrometer and an industrial robot, RoboVib® forms an automated test station for measuring everything from complex components to complete vehicle bodies. Reduce testing time and expenses as well as time to market significantly in experimental modal analysis. Conduct comprehensive 360° testing of a vehicle body, for example, within only one-two days and overnight instead of weeks of preparation with conventional test setups.
Further applications
- Modal analysis
![Experimental modal analysis and modal testing]( "Experimental modal analysis and modal testing")
Experimental modal analysis and modal testing - Tire acoustics
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- Drive train
![Vibration testing on drive trains, measuring on rotating shafts with RLV Rotational Laser Vibrometer]( "Vibration testing on drive trains, measuring on rotating shafts with RLV Rotational Laser Vibrometer")
Vibration testing on drive trains, measuring on rotating shafts with RLV Rotational Laser Vibrometer - Aero acoustics
![Aeroacoustic windtunnel measurement with laser scanning vibrometers from Polytec]( "Aeroacoustic windtunnel measurement with laser scanning vibrometers from Polytec")
Aeroacoustic windtunnel measurement with laser scanning vibrometers from Polytec - Electronics & EV
![Vibration testing on EV / BEV (battery) electric vehicles]( "Vibration testing on EV / BEV (battery) electric vehicles")
Vibration testing on EV / BEV (battery) electric vehicles - NVH testing
![Numerical simulation approaches allow better predicting of acoustic performance of component connections and NVH, © Polytec and Volvo Car Corporation]( "Numerical simulation approaches allow better predicting of acoustic performance of component connections and NVH, © Polytec and Volvo Car Corporation")
Numerical simulation approaches allow better predicting of acoustic performance of component
connections and NVH, © Polytec and Volvo Car Corporation - Body-in-white
![Modal testing of a body-in-white]( "Modal testing of a body-in-white")
Modal testing of a body-in-white - Brake acoustics
![Deflection shape analysis visualizing brake squeal, acoustical and dynamic behaviour]( "Deflection shape analysis visualizing brake squeal, acoustical and dynamic behaviour")
Deflection shape analysis visualizing brake squeal, acoustical and dynamic behaviour - Haptic displays
![Laser vibration measurement for testing and validating haptics displays]( "Laser vibration measurement for testing and validating haptics displays")
Laser vibration measurement for testing and validating haptics displays
