12 reviews

Brake Noise TestingDetect and track brake noise according to VDA 303 guideline

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

The solution offers a direct connection of accelerometer and microphone sensors with the automatic setup using TEDS. It will calculate all the needed parameters and statistics required for the analysis of the brake noise.

Sound

Sound pressure

Vibrations

Temperature

Acceleration

Velocity

RPM

Force

CAN bus

CAN FD

XCP/CCP

FlexRay

Polygon

Video

Thermal video

High-speed video

GPS and GLONASS

Inertial platforms

IP67

Shock rating 100g

Brake Noise Testing highlights

VDA 303 guideline

Detection of brake noise caused by mechanical vibration based on VDA 303 guidelines.

Complete analysis

Out-of-the-box comparison of sound and acceleration frequency spectrum.

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 or hardware. Configurations with any number of channel inputs are supported.

Other Measurement Signals and Protocols

Connect any other sensors and data protocols such as thermocouples, RTDs, strain gauges, GPS positioning, CAN bus, and CAN FD, XCP/CCP, Video, and others. All data sources are completely synchronized to each other.

Gun - Hun - Moan - Squeak - 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.

Compatible With Other Applications

Our solution is very flexible and offers easy extendability of the data acquisition systems to perform other vehicle tests such as brake testing, combustion analysis, vehicle dynamics, NVH tests, etc.

Dewesoft quality and 7-year warranty

Enjoy our industry-leading 7-year warranty. Our data acquisition systems are made in Europe, utilizing only the highest build quality standards. We offer free and customer-focused technical support. Your investment into the Dewesoft solutions is protected for years ahead.

Software included

Every Dewesoft data acquisition system is bundled with award-winning DewesoftX data acquisition software. The software is easy to use but very rich and deep in functionality. All software updates are free forever with no hidden licensing or yearly maintenance fees.

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 DAQ software. The software detects and tracks multiple brake noise events in multiple sound-vibration detection pairs simultaneously during the measurement. Statistical parameters of the noise event, or any scalar Dewesoft X channel, can be calculated in real-time during an actual brake noise event.

The brake noise solution is very flexible regarding DAQ 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. Any number of arbitrary channels such as temperature, RPM, brake pressure, etc. can be added, and statistics calculated.

The number of brake systems measured and analyzed is only limited by the available computer resources. Similar to any DewesoftX math modules, Brake squeal can also be used in the post-analysis mode to recalculate the data and correct initial setup mistakes.

Types of Brake Noise in Vehicles

The table below explains the different types of brake noise and judder experienced in vehicles:

Dewesoft brake noise solution is mainly used to detect and analyze

Column A	Column B
Judder	Non-resonant, velocity-dependent vibration. Caused by non-uniformities.Cold judder ≈ 10 Hz no noise, felt on the brake pedal, steering wheel.Hot judder ≈ 200 Hz can produce noise.
Groan Hun Moan	Groan < 100 Hz caused by stick-slip effect, axial vibration mode of the black clipper, and suspension components.Hum ≈ 100 - 400 Hz caliper mounting torsional vibration.Moan ≈ 600 - 700 Hz caliper whole-body movement.
Squeal Squeak quelch	Caused by vibration modes of braking components (disc and pad, brake drum, and brake shoe).Squeal ≈ 1 - 4 kHz, most intrusive.Squeak ≈ 4 - 15 kHz, higher-order modes.Squelch amplitude-modulated version of squeak noise,
Wire brush	Non-resonant high-frequency noise (up to 20 kHz). Random amplitude modulation. Often occurs before and occurrence of unstable squeak noise.

Groan - Hun - Moan and Squeal - Squeak - Squelch noises.

Brake Noise 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 testing input sensor configuration

Brake Noise Setup

DewesoftX offers a simple approach to set up your brake noise measurement, tracking, and analysis from a single screen. The setup user interface can be divided into four major parts:

Fourier transformation
Sound weighting
Noise detection
Channel groups

The setup will define and enable output channels where noise analysis results are written. There are three different types of outputs:

Amplitude spectrums: the 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 will have their own outputs. The results of statistic calculations will be written each time the noise event is finished. The statistic result is always output in the asynchronous scalar channel.
Tracking status: only one tracking status can be output by the plugin. It outputs the state of the tracking algorithm according to Tracking status.

You can learn more about settings and outputs in the brake noise online manual.

Brake noise testing DewesoftX setup screen

Measurement - Time- and Frequency-Domain (FFT) Data

When the measurement is performed, Dewesoft will measure time-domain and frequency-domain data (FFT) from the vehicle cabin microphone and vibration from accelerometers installed on brake calipers. Time-domain data will be transformed to frequency-domain in real-time using the Fast-Fourier transform (FFT).

Noise Peak Detection

Brake noise event detection and tracking work by comparing the amplitude spectrum of sound and vibration signals. Amplitude peaks from both spectrums have to be above a threshold that is specified for each sound and vibration channel on its own. Amplitude peaks that are above the threshold are then checked in the detection algorithm.

Dewesoft brake noise time frequency domain data

Brake Noise Analysis Results

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

Amplitude spectrum: The 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 is finished. Statistic results are always output 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 the Tracking status.

Dewesoft Brake Noise Applications

Dewesoft brake noise testing solution can be applied to various brake noise detection applications such as:

Passenger car's front and rear brakes
Truck brakes
Heavy machinery brakes
Train brakes
Airplane brakes
Wind turbines
Conveyor belts

Brake noise is undesirable and can cause several undesired side effects:

Increasing environmental noise pollution.
Reducing driver and passenger comfort.
Increasing warranty claims on new vehicles.
Can be regarded as a user fault, even if system braking performance isn’t impacted.

Great Investment
Future-Proof Application

Dewesoft brake noise testing is an excellent investment in your future. Our solutions are constantly being improved, and new features are being added all the time. All updates to the brake noise testing module are free of charge.

Our industry-leading 7-year Dewesoft data acquisition systems warranty means worry-free measurements for you. We are committed to ensuring that your investment in our measurement equipment is good - even when the unexpected occurs.

Together with world-class data acquisition technology, Dewesoft provides the best Brake Noise Testing solution your money can buy.

Additional Brake Squeal Resources

Brochures:

Vehicle testing brochure

Manual:

Dewesoft brake noise testing webinar

Webinars:

Brake noise testing webinar - our application engineers show and explains the Dewesoft Brake Squeal solution
Brake testing webinar - Latest webinar on brake testing and brake noise testing.