Efficient noise analysis of brake acoustics
Brake squeal, brake acoustics and brake noise are acoustic, complex phenomena that influence comfort as well as brake performance. Braking systems exhibit different brake acoustic behaviours depending on the vehicle. Careful vibration set-up is absolutely essential for quiet braking. The complex eigenvalue analysis illustrates unstable operating conditions during the simulation process. The results of the experimental modal analysis ensure that the models are updated with maximum precision.
Polytec Magazine
Brake discs on the test station
Experimental modal test with laser vibrometers
Brake acoustics on the test bench
Here, Polytec 3D Scanning Vibrometers help to efficiently analyze, measure and visualize brake squeal. The resulting, animated 3D deflection shapes allow profound analysis based on real and true measurement results (without applying additional masses) and a correspondingly solid data interpretation of the vibrating brake disc. Polytec’s 3D Scanning Vibrometers enable you to validate even small components such as brake pads for a bottom-up approach. The measurement technique remains the same, even during the final test on the air-conditioned NVH test bench (noise, vibration, harshness). The high spatial resolution records all the high-frequency modes that are characteristic of squealing. Non-contact measuring technology also provides you with reliable data for troubleshooting and model validation even on hot brakes.
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.
Further applications in automotive
- Modal analysis
![Experimental modal analysis and modal testing]( "Experimental modal analysis and modal testing")
Experimental modal analysis and modal testing - Tire acoustics
![Operational deflection shape rolling tire]()
- 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 - 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
