A5032965444- Advanced Measurement and Detection Methods
- Advanced Sensor Technologies Research
- Infrared Target Detection Methodologies
- Optical measurement and interference techniques
- Advanced Measurement and Metrology Techniques
- Aerospace and Aviation Technology
- Scientific Measurement and Uncertainty Evaluation
- Fluid Dynamics and Turbulent Flows
- Computational Fluid Dynamics and Aerodynamics
- Particle Dynamics in Fluid Flows
- Combustion and flame dynamics
- Aerodynamics and Acoustics in Jet Flows
- Surface Roughness and Optical Measurements
- Medical Image Segmentation Techniques
- Air Traffic Management and Optimization
- Image Processing and 3D Reconstruction
- Optical Systems and Laser Technology
- Gas Dynamics and Kinetic Theory
- 3D Surveying and Cultural Heritage
- Satellite Image Processing and Photogrammetry
- Tribology and Lubrication Engineering
- Engineering Applied Research
- Rocket and propulsion systems research
- Sensor Technology and Measurement Systems
- Advanced Optical Sensing Technologies
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2008-2018
A laser-generated sound source is used to generate a nearly omni-directional sound field. This field investigated experimentally reveal its characteristics as a function of the surrounding medium mean velocity. It found that source approximately has monopole character when generated in stagnant medium. Increas- ing flow velocity leads positive Doppler-shift combined with a convective amplification for an observer downstream while reverse is observed upstream source. The laser behaves...
Knowledge of propeller or rotor blade behaviour under real operating conditions is crucial for optimizing the performance a system. A team researchers, technicians and engineers from Avia Propeller, DLR, EVEKTOR HARDsoft developed rotating stereo camera system dedicated to in-flight deformation measurements. The whole system, co-rotating with at its full speed hence exposed high centrifugal forces strong vibration, had been successfully tested on an VUT 100 COBRA aeroplane in Kunovice (CZ)...
A combination of high-speed stroboscopic imaging with the Image Pattern Correlation Technique (IPCT) enables for non-intrusive measurement surface deformation fast vibrating or rotating objects. In this paper dedicated instrumentation aircraft propellers as well first results its application will be described.
The Image Pattern Correlation Technique (IPCT) in combination with high-speed stroboscopic imaging enables nonintrusive measurements of surface deformation fast vibrating or rotating objects. This paper describes a dedicated instrumentation for the measurement aircraft propellers as well results its application. further ideas technologies based on collected experiences, particular high-power pulsed object illumination semiconductor light sources are also presented.
The non-intrusive in-flight measurement of the deformation and pitch aircraft propeller is a demanding task. idea an imaging system integrated rotating with has been presented on 30<sup>th</sup> International Congress High-Speed Imaging Photonics (ICHSIP30) in 2012. Since then this constructed tested laboratory as well real aircraft. In paper we outline principle Image Pattern Correlation Technique (IPCT) based Digital (DIC) describe construction dedicated autarkic 3D camera placed...
The rapid progress of light emitting diode (LED) technology has recently resulted in the availability high power devices with unprecedented emission intensities comparable to those visible laser sources. On this basis two versatile have been developed, constructed and tested.<br/> <br/> first one is a high-power, single-LED illuminator equipped exchangeable projection lenses providing homogenous spot defined diameter. second device multi-LED array consisting number high-power LEDs, each...
The Image Pattern Correlation Technique (IPCT) is a powerful optical tool to measure the surface shape and deformation of aircraft structures, e.g.wings, propeller or rotor blades, non-intrusively in flight.The latest development this technique its application 360° measurements.Therefore special stereo camera system rotating with at full rotational speed was designed, whereby exposed extreme vibration centrifugal forces.By beginning 2014 whole had been successfully tested on an Evektor VUT...
The non-intrusive in-flight deformation measurement and the resulting local pitch of an aircraft propeller or helicopter rotor blade is a demanding task. idea imaging system integrated rotating with air-craft has already been presented at 30th International Congress on High-Speed Imaging Photonics (ICHSIP30) in 2012. Since then this designed, constructed tested laboratory as well Cobra VUT100 Evektor Aerotechnik, Kunovice (CZ). major aim EU FP7 project AIM<sup>2</sup> ("Advanced In-flight...
For the design of rotors for helicopters or wind turbines, knowledge movements and deformations rotor blades is important.Measuring these parameters in rotating system difficult, because number sensors limited due to their impact on aerodynamics modification structure.Strain gauge measurements furthermore can be affected e.g. by sensor location temperature effects.To avoid those problems addition enable direct shape measurements, optical methods have been applied deformation past.These...
Flight tests of new or modified aircraft are a necessary part the design process and provide final validation full scale design. testing for certification is critical phase as all trials proving compliance, with respect to specifications regulations must be completed in shortest possible time, while maintaining high standards process. Usually significant instrumentation installed validate predicted behaviour also detect unforeseen problems so that, if necessary, fast modifications can done....
Abstract For the exploration and validation of integration efficient propulsion concepts new technologies for future large passenger aircraft, it is necessary to establish suitable design, evaluation measurement tools. Therefore, as one major activity Large Passenger Aircraft (LPA) Platform 1 Clean Sky 2 initiative, so-called Cross-Capability Demonstrator (XDC), has been set up develop demonstrate powerful numerical experimental methods aerodynamic, aeroacoustics, aeroelastic simulation...
Photogrammetric methods for in-flight deformation measurements have undeniable advantages: e.g.contactless measurements, measuring the entire surface and relative simplicity of setup.During European research projects Advanced In-Flight Measurement Techniques (AIM AIM2) an implementation photogrammetric method -Image Pattern Correlation Technique (IPCT) has been proposed.It had successfully applied in several flight test campaigns.To evaluate measurement error either opto-geometric...