Description
In the development and production of brake systems, damping layers, known as shims, are applied to the brake pad backing plates to suppress brake squeal. To compare the effectiveness of different shims, samples are measured according to company-specific specifications. These specifications are usually based on determining the modal damping as a function of natural frequency and temperature.
MAUL-THEET offers a system where time-consuming measurements are automated, thus delivering efficiently reproducible results.
Standards and guidelines
With the DTS, measurements can be carried out according to the following standards and guidelines
The measurement results are automatically summarized in a report, or very simply at the touch of a button.
Advantages & Innovations
- Temperature range -60°C to 200°C
- Temperature-triggered excitation by automatic modal hammer
- Continuous, non-contact temperature detection
- Damping map over frequency and temperature
- Different attenuation calculation (half-width, x-dB, SDOF)
- Vibration measurement with a laser Doppler vibrometer or accelerometer
- Shim test according to SAE J3001
- Automated testing system
- Cost and time savings thanks to low personnel costs
- Results database including meta data
- DAkkS calibration (DIN EN ISO/IEC 17025) possible
Application & Integration
- Quality control
- Testing of brake components
- Research and development
- Product testing
- Prototype studies
- Material testing
Components
Excitation unit
Broadband excitation is achieved with an automatic modal hammer (vImpact of the 60/2000 series)
- Frequency ranges up to 60kHz/6kHz
- Impact forces up to 150N/2500N
- High reproducibility
Vibration/temperature sensor
The DTS can be operated with the following sensor types
- Laser Doppler vibrometer
- Accelerometer
- Infrared temperature sensors
Measurement data acquisition
4-channel measuring system with synchronous scanning
- AC, DC and IEPE coupling
- Anti-aliasing filter
- 24-bit resolution
- Frequency ranges 1 to 100kHz
- Frequency resolution 100 to 26500 FFT lines
Windows PC
- Standard or industrial PC, also according to customer requirements, with Windows 10/11
Software
The DTS software controls the entire testing process. It includes the identification of test objects, the measurement process flow, measurements, analyses and evaluations, as well as documentation and report generation.
Specification of the measuring device
- Name and meta data
- dB values for attenuation calculation (0.5 to 3dB)
- Selectable frequency range
- Frequency resolution (number of FFT lines) selectable
- Temperature-dependent frequency bands for frequency determination (peak picking)
- Different methods for determining attenuation (x-dB, SDOF, curve-fit)
Measuring sequence according to regulations (SAE J3001)
- Any order of measuring 5 material samples
- Calculation of the damping average values according to specifications
- Report creation with flexible representation of the attenuation values depending on frequency and temperature
Automatic measurement procedure
- Triggering the automatic modal hammer for selected temperatures
- Measurement of the excitation force and the vibration response
- FRF averaging
- Peak picking, attenuation calculation and graphical display of results
Report creation and output of results for each job as a table
- Printer, PDF, Excel, CSV, etc.
What we can do for you
In addition to manufacturing and supplying standard measurement systems for temperature- and frequency-dependent attenuation determination on shim probes, we design, plan and develop customized solutions tailored to your requirements. We are also happy to perform the measurements for you as a service.
Please contact us, we will be happy to make you an offer.
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