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  • ADAS
    ADAS
  • Brake Testing
    Brake Testing
  • Brake Noise Testing (Squeal)
    Brake Noise Testing (Squeal)
  • Combustion Analysis
    Combustion Analysis
  • E-Mobility
    E-Mobility
  • Harsh Environment Testing
    Harsh Environment Testing
  • Pass-by Noise Testing
    Pass-by Noise Testing
  • Road Load Data and Durability Testing
    Road Load Data and Durability Testing
  • Vehicle Dynamics
    Vehicle Dynamics
  • Power Analyzer
    Power Analyzer
  • Power Quality
    Power Quality
  • E-Mobility
    E-Mobility
  • FFT Analyzer
    FFT Analyzer
  • Order Tracking
    Order Tracking
  • Octave Analysis
    Octave Analysis
  • Rotor Balancing
    Rotor Balancing
  • Rotational and Torsional Vibrations
    Rotational and Torsional Vibrations
  • Human Body Vibration
    Human Body Vibration
  • FFT Analysis
    FFT Analysis
  • Modal Analysis
    Modal Analysis
  • Shock Response Spectrum - SRS
    Shock Response Spectrum - SRS
  • Fatigue Analysis
    Fatigue Analysis
  • Bridge Monitoring
    Bridge Monitoring
  • Sound Level Meter
    Sound Level Meter
  • Octave Band Analysis
    Octave Band Analysis
  • Sound Intensity
    Sound Intensity
  • Sound Power
    Sound Power
  • Reverberation Time RT60
    Reverberation Time RT60
  • PCM Telemetry
    PCM Telemetry
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Brake Noise Testing (Squeal)

Dewesoft Brake Noise (Squeal) testing solution is ideal for detecting and tracking noise caused by mechanical vibration in various braking systems based on the VDA 303 guideline algorithm.

 

The brake squeal math detects and tracks brake noise and squeals events from microphone and accelerometer measurements. The capacity to support an unlimited number of microphones and accelerometers make the plugin very flexible. Any number of arbitrary channels such as temperature, RPM, brake pressure, etc. can be added, and statistics calculated.

Sound
Sound
Sound pressure
Sound pressure
Vibrations
Vibrations
Temperature
Temperature
Acceleration
Acceleration
Velocity
Velocity
RPM
RPM
Force
Force
CAN bus
CAN bus
CAN FD
CAN FD
XCP/CCP
XCP/CCP
FlexRay
FlexRay
Polygon
Polygon
Video
Video
Thermal video
Thermal video
High-speed video
High-speed video
GPS/GLONASS
GPS/GLONASS
Inertial platforms
Inertial platforms

Main Features

  • VDA 303: Software is developed according to VDA 303 guideline.
  • EASY SENSOR PAIR DEFINITION: Detects squeal events from pairs of microphone and accelerometer measurements. Pairs are generated automatically from specified accelerometer and microphone channels. 
  • AUTOMATIC CALCULATION: Squeals are determined from amplitudes of sound and mechanical vibration. Fourier transformation settings are integrated. Only direct time-domain measurements are needed to detect squeal events. 
  • FLEXIBLE CONFIGURATION: The number of microphone and accelerometer channels is not limited by the software. 
  • SQUEAL TRACKING: Each detected squeal is tracked. During the squeal event, statistics on squeal parameters and other Dewesoft X channels (temperatures, RPMs, vehicle speed...) can be calculated.

Brake Noise Detection

The detection of brake noise is based on the comparison of sound and the mechanical vibration amplitude spectrum. The only inputs needed to detect brake noise events are sound and vibration measurements. Amplitude spectrum calculation with a fast Fourier transform (FFT) algorithm is integrated into the software plugin. During the measurement, the plugin can detect and track multiple brake noise events in multiple sound-vibration detection pairs simultaneously, while statistical parameters of the noise event, or of any scalar Dewesoft X channel, can be calculated during an actual brake noise event.
 
Brake squeal is flexible regarding hardware configurations. With an automatic pairing of defined sound and vibration inputs in detection pairs, the configuration workload is significantly reduced for large measurement setups. The number of brake systems measured and analyzed is only limited by the available computer resources. As with Dewesoft X math modules, Brake squeal can also be used in analysis mode to recalculate the data and correct initial setup mistakes.

Input Channel Configuration

Dewesoft brake noise solution offers a very flexible and simple channel configuration:

  • Inputs and statistics are defined in channel groups
  • Each microphone or accelerometer channel will generate an FFT output
  • Statistics are output for each microphone-accelerometer pair
  • Global microphones are paired with all accelerometers in local groups
  • Local microphones are paired only with accelerometers in the local group
  • Global channel statistics are calculated on all squeal pairs, local only on local pairs
  • The number of local groups is unlimited

Brake Noise Analysis Results

Results of plugin calculations are written in the outputs. There are three different types of outputs:

  • Amplitude spectrum: Result of the amplitude spectrum calculation of each microphone and accelerometer is written in an asynchronous array channel.
  • Statistic outputs: The statistic calculations on each microphone-accelerometer detection pair have their own outputs. Results of statistics calculations are noted for each noise event when it finished. Statistic results are always outputs in an asynchronous scalar channel.
  • Tracking status: One tracking status only can be output in the plugin. The state of the tracking algorithm is output in accordance with Tracking status.

Additional Brake Squeal Resources

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