Kurzdefinition
Typische Anwendungen
Ablauf
Ausgänge und Schnittstellen
Normen und Richtlinien
FAQ
Description
The TBT turbine and compressor blade test stand is designed for non-destructive testing (NDT) of all common blade types. It is suitable for compressor, turbine, fan, impeller and diffuser blades, as well as for blisks/IBRs.
By determining natural frequencies with high precision to an accuracy of <1Hz—tailored to the requirements of master-blade measurements—the TBT enables reliable pass/fail assessments. The high resolution of the measurement results is achieved through a highly optimized clamping system in combination with MAUL-THEET software.
The system was developed more than 17 years ago in collaboration with one of the world’s largest steam and gas turbine manufacturers and has been in service ever since. For over 10 years, these test stands have also been used in the aerospace sector by leading manufacturers. The test stand is used both after manufacture and after refurbishment of turbine and engine blades.
The Turbine and compressor blade test stand was specifically developed for highly precise determination of blade resonances while minimizing the influence of the clamping on the measurement results.
Advantages & Innovation
- Cost and time savings thanks to low personnel costs
- Automated test system for determining natural frequencies
- Test procedures in accordance with internal company regulations
- Scalable for different blade types and sizes
- Different clamping blocks depending on blade size
- Software-controlled hydraulic clamping (optional by arrangement)
- Easy to use
- Excitation by automatic modal hammer
- Non-destructive testing (NDT)
- Bounce-free excitation
- High reproducibility
- Vibration measurement using a laser Doppler vibrometer, microphone or accelerometer
- Frequency range up to 100kHz
- Frequency resolution <1Hz to 20kHz
- Automatic measurement report generation
- Project-orientated database structure
- SQL database for multiple workstations
- Blade database
- Export to Excel, ASCII or SAP
- DAkkS calibration (DIN EN ISO/IEC 17025) possible
Application & Integration
- Master blade measurement
- Quality control
- 100% inspection
- End-of-line testing
- Series testing
- Determination of resonances
- Eigenvalue determination of engine blades
- Eigenvalue determination of gas and steam turbine blades
- Turbine blade reworking
- Product testing
- Prototype studies
- Research and development
- Machine diagnostics
- Early damage detection
- Material testing
Components
Excitation unit
The broadband excitation is carried out with a manual or automatic modal hammer
- Frequency ranges up to 40kHz
- Impact forces up to 2500N
- High reproducibility
Vibration sensor
The TBT can be operated with the following vibration sensors
- Laser Doppler vibrometer
- Microphone
- Accelerometer
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
Standard test stands
MAUL-THEET offers three different standard configurations for determining the natural frequencies. In addition, inputs for pressure and temperature measurement are available.
Test stand configurator
| TBT with customer-owned hydraulics | TBT with manual hydraulics | TBT with PLC-controlled hydraulics | |
|---|---|---|---|
| Excitation | Hammer without measuring cell, hammer with measuring cell or automatic modal hammer | Hammer without measuring cell, hammer with measuring cell or automatic modal hammer | Hammer without measuring cell, hammer with measuring cell or automatic modal hammer |
| Clamping | Customer's clamping | hydraulic, manual | hydraulic, PLC-controlled |
| Vibration sensors | Laser (LDV), microphone or accelerometer | Laser (LDV), microphone or accelerometer | Laser (LDV), microphone or accelerometer |
| Monitoring sensors | Pressure clamping (optional) or temperature (optional) | Pressure clamping (included) or temperature (optional) | Pressure clamping (included) or temperature (optional) |
Software
The TBT software controls the entire test process. It includes user management, management of test objects, work orders, measurements and analyses, as well as documentation and report generation.
Specification of the test object
- Name and meta data
- dB values for attenuation calculation (0.5 to 3dB)
- Frequency range 1 to 40kHz selectable
- Frequency resolution (number of FFT lines) selectable
- Frequency bands and permissible tolerance ranges
Measuring sequence according to a task
- Series measurement
- Repeat measurement
- Master blade measurement
Automatic measurement procedure
- Manual shock excitation or triggering the automatic modal hammer
- Measurement of the excitation force (if present) and the vibration response
- Averaging the FRF or response spectrum
- Peak picking and quality assessment
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 natural frequency determination, we design, plan and develop customer-specific solutions to meet your requirements. We are also happy to carry out the measurements for you as a service.
Please contact us—we will be happy to provide you with a quote.