Description
With the Acoustic Quality Test Stand, it is possible to determine the modal parameters (natural frequencies and damping) of various technical components fully automatically, detect parts that deviate from specifications, and mark or eject them.
This test is essential, especially for final inspection of aluminium components (shrinkage cavities, coarse grain formation and geometric deviations), brake pads (shape deviations and lining separation), and brake discs (coating defects and cracks). In production quality control, modal parameters are characteristics that can be determined quickly.
With the AQC, MAUL-THEET offers a complete system that performs and evaluates these measurements fully automatically and, if required, marks or ejects components that deviate from specifications.
Standards and guidelines
Advantages & Innovations
- Crack detection in components
- Detection of blowholes and coarse grain formation
- Detection of geometric deviations
- Detection of brake pad detachments
- Detection of delamination
- Cost and time savings thanks to low personnel costs
- Cost and time savings through non-destructive testing
- 100% testing compliant with VDA 301 & VDA 302
- Automated test system for determining natural frequencies and damping
- User-friendly software
- Very short cycle times
- High reproducibility
- Bounce-free excitation
- DAkkS calibration (DIN EN ISO/IEC 17025) possible
Application & Integration
- Fully automatic measurement and evaluation
- Setting frequency bands for quality control (good/bad statement)
- Calculation of damping or loss factor
- Freely selectable dB values for the attenuation calculation
- Quality factor for damping value
- Excitation by automatic modal hammer
- Vibration measurement with microphone
- Frequency range up to 100kHz
- Frequency resolution < 1Hz to 20kHz
- Automatic measurement report generation
- Central database via LabLINK or SQL
- Data export in ASCII or CSV format
Application & Integration
- Quality control
- Series testing
- End-of-line testing
- 100% inspection
- In-line testing
- Testing of brake components according to VDA 301 and VDA 302
- Natural frequency measurement
- Damping determination
- Determination of resonances
- Component tests
- Material testing
- Prototype study
Components
Excitation unit
The broadband excitation is carried out with an automatic modal hammer
- Frequency ranges up to 60kHz
- Impact forces up to 2500N
- High reproducibility
Vibration sensor
The AQC is operated with the following vibration sensors
- One or more microphones
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 AQC software controls the entire testing process. It includes automatic measurement of test pieces in series, analysis, and communication with the production line control system.
System solutions
Specification of the test object
- Component identification via bar or QR code
- dB values for attenuation calculation (0.5 to 3dB)
- Frequency range 1 to 100kHz selectable
- Frequency resolution (number of FFT lines) selectable
- Frequency bands and permissible tolerance ranges
Measuring sequence in series
- Start of the measuring process after component positioning has been completed
- Averaging
- Determination of quality parameters (frequency, attenuation, etc.)
- Transmission of the quality decision to the manufacturing and production facility
System solutions
Automatic measurement procedure
- Automatic component positioning
- Triggering the automatic modal hammer
- Measurement of impact force and vibration response
- FRF averaging
- Peak picking, attenuation calculation and quality assessment
- Control for component separation
Output of the test data
- SQL database connection according to customer specifications
- LabLINK database connection according to customer specifications
- SAP connection according to customer specifications
- Printer, PDF, Excel, CSV, etc.
System solutions
What we can do for you
In addition to manufacturing and supplying standard measurement systems for determining natural frequency and damping, 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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