Description
During the development and production of brake systems, damping layers, so-called shims, are applied to the brake pad carrier plates to suppress brake squeal. To compare the effect of different shims, samples are measured according to in-house specifications. The specifications are mostly based on determining the modal damping depending on the natural frequency and temperature. MAUL-THEET offers a system in which the time-consuming measurements are carried out automatically and thus efficiently delivers reproducible 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 test system for determining natural frequencies and damping
- 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
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, measurement process flow, measurements, analyzes and evaluations as well as documentation and report creation.
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 the production and delivery of standard measuring systems for temperature- and frequency-dependent attenuation determination on shim samples, we design, plan and develop customer-specific solutions according to your requirements. We would also be happy to carry out the measurements for you as a service.
Contact us, we will be happy to make you an offer.