MERIT
Munich Experimental Rotor Investigation Testbed
Der MERIT Prüfstand wurde allgemein für Rotor- und Propellorversuche ausgelegt. Das robuste und kompakte Design ermöglicht dynamische und hochlastige Versuchsanwendungen, z.B. den schnellen Vorwärtsflug. Während des Auslegungsprozesses war ein Hauptkriterium die kompatibilität mit dem Windkanal A vom Lehrstuhl für Aerodynamik und Strömungsmechanik um solche Messkampagnen zu ermöglichen.
Performance Data
| 3000 RPM |
| 85 kW |
| 270 Nm |
| +/- 30° pitch (collective + cyclic) |
| 1,2,4 Rotorblätter |
| 2.6 m Rotorhöhe |
Messtechnik
| Induktive Telemetrie: 34 k., 20 kHz p. k., 16 bit, MANNER (DMS, Instationäre Drucksensoren) | |
| DIC/Fotogrammetrie: ARAMIS SRX 1600 MV4200 HD 1000 Hz (Blattdeformationsanalyse) | |
| Rotierende FBG System: FBG-Scan 80X, 8 optische k., 250 Hz p. k. (Blattdeformationsanalyse) | |
| 4 Kraftmessdosen K3D120, ME Meßsysteme (Rotorlasten) | |
| 1 Drehmoment & Geschwindigkeitssensor DATAFLEX32, KTR | |
| 1 Rotor geschwindigkeitssensor IH150, Globalencoder | |
| 4 pitch Hallsensor PMIS4-20-40, ASM |
Rotorblätter
| MERIT | |
|---|---|
| R = 0.9 m | |
| c = 0.13 m | |
| NACA0012 0° tab | |
| gelenklos | |
| keine Zusammenspitzung | |
| kein Twist |
| AREA | |
|---|---|
| R = 1.723 m | |
| c = 0.114-0.154 m | |
| NACA 23012 | |
| Schwenkgelenk | |
| Zusammenspitzung: 0.6, linear | |
| -10° Twist |
Gehäuse
Aktuelles
Das Digital Image Correlation Equipment und Methodik wurde mit dem AREA Blattsatz angewandt, und MERIT und AREA Blätter wurden bis zum Strömungsabreißkollektivwinkel gezogen. Die Deformation der Blätter in diesen extremen Bedingungen wurde erforscht und veröffentlicht.
AREA: 500-900 rpm, 0°-18° Kollektivwinkel
MERIT: 900-1500 rpm, 0°- 24° Kollektivwinkel
- 900, 1200, 1500 rpm
- 14° +/- 1,2,...,10°
- 16° +/- 1,2,...,8°
- 18° +/- 1,2,...,6°
- 20° +/- 1,2,...,6°
-4°,-3°,...,24° Kollektivwinkel
900, 1200, 1250 rpm
Mit Hilfe von Gunter Sanow und Daniel Maraite von Zeiss GOM GmbH, wurde das Digital Image Correlation Equipment mit dem ARAMIS SRX Sensor bei einer Maximalbildrate von 1000 Hz eingesetzt, um die Blattdeformation des MERIT Blattsatztes bei 900 und 1800 rpm und bis zu 12° Kollektiv zu messen (09-2021)
AREA Rotorversuch bei 680 rpm Nominaldrehzahl und bis zu 4° Kollektivwinkel
As a baseline rotor for dynamic stall experiments, the blades have no twist, a rectangular planform, naca0012 airfoil, 130mm chord and a radius of 900mm.
The structure consists of a carbon c-spar with lead balance weight and a bearing laminate with two bolts at the attachment. An integrated connector will provide the necessary interface for possible metrology such as strain gauges or pressure transduces.
We have used SONATA, VABS and ANBA4 for the predesign of the sectional properties. The first static structural tests were recently performed with the goal to verify the predicted beam properties experimentally with Digital Image Correlation (DIC)
Without the large assistance of Daniel Maraite of GOM, who supported us with an ARAMIS SRX sensor, and the continuous support of VABS from Analyswift this work would not have been possible.
We would also like to thank the TUM Laboratory for Product Development and Lightweight Design, the TUM Chair of Carbon Composites and the TUM Workshop of the Physics Department for their generous support!
Low speed operation with actuators, swashplate and rotor head in safety containment (01-2020)
Successful Assembly of Rotor Drive Train (03-2019)
Publications
Heuschneider, V., Yavrucuk, I., and Hajek, M.: Structural Blade Loads on a Rotor during Dynamic Stall in Hover, Proceedings of the Vertical Flight Society`s 80th Annual Forum & Technology Display, Montréal, Québec, Canada. May 7-9, 2024.
Baldan, G., Heuschneider, V., Mitropoulos, M., Yavrucuk, I., and Guardone, A.: Numerical and Experimental Investigation of Stall on the MERIT Rotor in Hover, Proceedings of the Vertical Flight Society`s 80th Annual Forum & Technology Display, Montréal, Québec, Canada. May 7-9, 2024.
Mitropoulos, M., Heuschneider, V., Barth, A., and Yavrucuk, I.: Experimental Whirl Tower Tests Approaching and Surpassing Stall for a Variety of Tip Speeds and Rotor Blades, Proceedings of the Vertical Flight Society`s 80th Annual Forum & Technology Display, Montréal, Québec, Canada. May 7-9, 2024.
Berghammer, F., Sosa, B., Heuschneider, V., Yavrucuk, I., and Hajek, M.: Testing of a Fiber-Optical Sensor System for Rotor Blade HUMS, Proceedings of the Vertical Flight Society`s 79th Annual Forum & Technology Display, West Palm Beach, Florida, USA. May 16-18, 2023.
Heuschneider, V., Berghammer, F., Abdelmoula, A., Hajek, M., and Sirohi, J.: Model Based Blade Attachment Stiffness Evaluation of the MERIT Rotor in Hover with Photogrammetry and Digital Image Correlation, Proceedings of the Vertical Flight Society’s 78th Annual Forum & Technology Display, Fort Worth, Texas, USA. May 10-12, 2022.
Berghammer, F., Heuschneider, V., and Hajek, M.: Development And Integration Of A Fiber-Optical Sensor System For Rotor Blade State Observation, Proceedings of the Vertical Flight Society’s 78th Annual Forum & Technology Display, Fort Worth, Texas, USA. May 10-12, 2022.
Heuschneider, V., Berghammer, F., Pflumm, T., and Hajek, M.: Development and Initial Hover Testing of the Mach Scaled Rotor Test Rig MERIT, Proceedings of the 47th European Rotorcraft Forum, Royal Aeronautical Society, Virtual, September 2021.
Pflumm, T., Gaugelhofer, L., Heuschneider, V., Berghammer, F., and Hajek, M.: Hybrid Experimental Measurement of Sectional Stiffness Properties of the MERIT Rotor Blade with Digital Image Correlation, Proceedings of the 47th European Rotorcraft Forum, Royal Aeronautical Society, Virtual, September 2021.
Heuschneider, V., Berghammer, F., and Hajek, M.: Numerical and Experimental Study on the Modal Characteristics of a Rotor Test Rig, Society for Experimental Mechanics, Topics in Modal Analysis & Testing, Volume 8, Proceedings of the 38th IMAC, A Conference and Exposition on Structural Dynamics 2020.
Contact
Matti Mitropoulos, M.Eng. (Test rig operation, rotating DIC/photogrammetry system)
Verena Heuschneider, M.Sc. (Test rig design, instrumentation & operation, dynamic stall campaigns)
Tobias Pflumm, M.Sc. (Rotor blade composite design & manufacturing)
Florian Berghammer, M.Sc. (FBG sensor integration, rotating blade deformation)