RX11 – ADIOS (ADvanced Isolation On Sounding-rockets)
FH Aachen, Germany
Launch Date: 16 November 2012
The goal of the ADIOS experiment is to further develop and optimise the VibraDamp system which was successfully flown on REXUS 7 in 2010. ADIOS is primarily a passively damped experiment module that isolates the external forces that may negatively impact on experiment performance. The contactless damping system operates under the eddy current principle, and is sized to fit into a REXUS standard module. To verify the damping quality, the residual accelerations acting on the rocket structure and inside the isolated experiment container shall be measured using a tri-axial accelerometer, during the reduced gravity phase of the flight. All components shall be as light as possible, so as to further reduce the mass of the structure. To aid this process, a complete working knowledge of the mechanical loads acting on the structure is important. Therefore, the second goal of the ADIOS experiment is to measure structural static and dynamic loading during the flight. A third tri-axial accelerometer with a wide sensitivity range shall be used to measure the dynamic load during flight. The static loads onto the structure shall be determined using at least twelve one-dimensional strain gauges. Respectively, four strain gauges shall be located at different positions in one cross-section of the rocket structure. Using this knowledge, it should be possible to optimise material selection and the associated mass of the structure, and therefore enhance the design of sounding-rockets.
RX07 – VIBRADAMP (Damping system for an experiment module)
FH Aachen, Germany
Launch Date: 2 March 2010
The goal of the VIBRADAMP experiment was to investigate whether it is possible to improve the microgravity quality of the REXUS rocket, by means of a passive experiment isolation system based on the eddy current effect. During the free fall phase of a REXUS flight, the induced microgravity can often be affected by externally produced vibrations, negatively influencing experiment performance. VIBRADAMP aimed to combat this effect by developing a lightweight, passively damped experiment module for REXUS which would isolate a major part of the forces acting on the system. During the free fall period, the only connection between the damped module and the rocket structure would be small beam-springs. The contained experiment would be isolated further by the counter movement of opposing magnetic fields generated by a permanent magnet passing over an electrically conductive plate. It was anticipated that the experiment would create a system with an Eigen frequency below 1 Hz which could isolate approximately 95% of the forces acting on the damped system. To verify the system two accelerometers were used to measure and compare the accelerations acting on the damped system and the surrounding structure.
BX09 – reel.SMRT (Balloon microgravity platform)
‘Erasmus Mundus’ Space Masters course
Launch Date: 11 October 2009
The purpose of reel.SMRT was to investigate the feasibility of a balloon based microgravity research platform, capable of conducting multiple drop tests in a s ingle mission. The system consisted of a small capsule, which could be dropped or lowered from the main balloon gondola and then returned, using a fishing reel and motor connected to the capsule by a high strength line. Complex mechanical, electrical and data acquisition systems were implemented to monitor the low gravity performance during operation. The vision was that this microgravity platform could be scaled up to cover drop distances on the order of hundreds of meters, thereby providing cyclical, extended periods of freefall, and a viable alternative to parabolic flights and drop towers. During the BEXUS flight, a payload tethered to the reel.SMRT system was dropped and decelerated using an internal braking system. As the payload came to a halt, it was reeled back up to the gondola and re-released. This cycle was to be repeated several times, in order to measure the microgravity quality during the free-fall phase.