Frequency & Damping Test Stand SAEJ2598 | FDT


High Precision Automotive Disc Brake Pad Natural Frequency and Damping Test

Brake pads are of central importance in the development and production of brake systems. The dynamic properties of the brake pads are essential characteristics for simulating the brakes during the development process or for quality control in production. The measurement of the dynamic properties (including modal values) of brake pads is described in SAEJ2598. MAUL-THEET offers a complete system that automatically carries out, evaluates and documents these measurements in accordance with SAEJ2598. With the MAUL-THEET test bench it is also possible to determine the dynamic properties (natural frequencies and damping) of other technical components.

Advantages & Innovation

Vibration measurement with Laser Doppler Vibrometer, accelerometer or microphone

excitation by automatic modal hammer

Easy to use software

Cost and time savings due to low personnel costs

Automated test system for determining natural frequencies and damping

Calculation of Damping or Loss Factor according to SAE J2598

Quality Sentencing based on Frequency Tolerances

Frequency range up to 100 kHz

Frequency resolution < 1Hz at 20 kHz

damping estimation according to SAE J2598

Project-oriented database structure

Central SQL database for multiple workstations


Selectable dB Values for Damping Estimation for each Natural Frequency

Temperature Measurement with optional Frequency Correction

Applications & Integrations

damping values for brake pads according to SAE J2598

Quality control

Sampling inspection

Material testing

Product testing

Research and Development

model updating

experimental modal analysis

It consists of an aluminium construction with the following components:

Excitation Unit

The broad band excitation is done with an Automatic Impact Hammer:

Frequency Range 0.3 to 40 kHz

Impact Force up to 200N peak

High Reproducibility

Vibration Sensor

The following sensors can be used with the VTS:


Laser Doppler Vibrometer

Acceleration Sensor

Data Acquisition

4 Channel DAQ synchronous sampling:

Frequency Ranges 1 kHz to 40 kHz

Frequency Resolution100 to 26500 FFT Lines

AC, DC and IEPE Coupling

Windows PC

All in One PC with Windows 10:


256 GB SSD

vDamp SAEJ2598 Software

The vDamp software handles the complete test procedure. It covers user management, parts and work order handling, measurements, analysis, documentation and reporting.

Part type specification:

Name and Meta data

Frequency range 1 kHz - 20 kHz selectable

Frequency Resolution (No of FFT lines) selectable

Frequency bands, Frequency Tolerances

dB Values for Damping Calculation (0.5 to 3dB)

Measurement Procedure based on Work Order:

Serial Measurement

Repetition Measurement

Automatic Measurement Procedure:

Triggering of Automatic Impact Hammer

Measurement of Excitation Force and Vibration Response

Averaging and Analysis

Peak Picking, Damping Calculation and Sentencing

Reporting Output of Work Order Results as Chart to:

Printer, PDF, Excel, CSV, etc.

Data Export:



Break Pad Test Stand


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