Description
During 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 that automates these time-consuming measurements, thus delivering efficiently and reproducibly results.
Advantages & Innovations
- Cost and time savings thanks to low personnel costs
- Shim test according to SAE J3001
- Vibration measurement with a laser Doppler vibrometer or accelerometer
- Temperature-triggered excitation by automatic modal hammer
- Continuous, non-contact temperature detection
- Temperature range -60°C to 200°C
- Automated testing system
- Frequency range up to 100kHz
- Frequency resolution < 1Hz to 20kHz
- Damping map over frequency and temperature
- Different attenuation calculation (half-width, x-dB, SDOF)
- Results database including meta data
- DAkkS calibration (DIN EN ISO/IEC 17025) possible
Application & Integration
- Brake parts (pads, discs, calipers, etc.)
- Quality control
- Material testing
- Series testing
- Research and development
- Product testing
- Optimization of development-related simulations
Components
Excitation unit
The broadband excitation is carried out with an automatic modal hammer
- Frequency ranges up to 40kHz
- Impact forces up to 2500N
- High reproducibility
Vibration/temperature sensor
The DTS can be operated with the following sensor types
- Laser Doppler vibrometer
- Infrared temperature sensor
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)
- Frequency range 1 to 20kHz selectable
- 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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