Technical papers

A NEW INTEGRATED TOOL FOR TESTS MANAGEMENT

Environmental testing at system level (Intespace core business) is requiring managing several hundreds of sensors both in mechanical (accelerometers, strain gauges) and thermal-vacuum (thermocouples) domains. Preparation test phase is split in different phases which involve several work units: design office for sensor location with respect to model analysis results, metrology department for calibration, AIT and Test Center teams for sensors management.

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DYNAMIC MASS MEASUREMENTS TO IMPROVE MICRODYNAMIC TESTS

Generally, the measurement of the reaction forces and moments characterizing the micro-vibration emitted by an item is carried out with the source being rigidly mounted on a multi DoFs measuring system. However, this is dependent on the dynamic behavior of the supporting structure: the levels seen at the interface of a coupled system - typically an equipment or a source mounted on a satellite structure- depend on the dynamic characteristics of each substructure taken separately. This is the problem of substructuring which can be solved by various techniques such as modal synthesis or frequency response synthesis (FRF coupling). It requires the knowledge or the determination of the dynamic characteristics (dynamic flexibility, dynamic mass …) of each part and in particular across each interface.

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Sensors Network Development

Environmental testing at system level (Intespace core business) is requiring managing several hundreds of sensors both in mechanical (accelerometers, strain gauges) and thermal-vacuum (thermocouples) areas. After the failure of the SACER project in 2012, Intespace has decided to rebuild its wireless sensors roadmap in a more progressive way.

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Sensor Numerical Identification

Environmental testing at system level (Intespace core business) is requiring managing several hundreds of sensors both in mechanical (accelerometers, strain gauges) and thermal-vacuum (thermocouples) areas. Preparation test phase is split in different phases which involved several work units: design office for sensor location with respect to model analysis results, metrology department for calibration, AIT and Test Center teams for sensors management. The last part includes sensors and associated cables preparation, bonding onto the specimen in the right location and orientation, follow-up during testing, de-assembly and storage at the end of the test campaign.

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SINE SWEEP EFFECT ON SPECIMEN MODAL PARAMETERS CHARACTERIZATION

The sine sweep base excitation test campaign is a major milestone in the process of mechanical qualification of space structures. The objectives of these vibration tests are to qualify the specimen with respect to the dynamic environment induced by the launcher and to demonstrate that the spacecraft FEM is sufficiently well correlated with the test specimen.

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Stratospheric balloon Test Facility Equipment

In order to support CNES and ONERA activity on stratospheric and tropospheric balloons development, INTESPACE has recently developed a new test facility Equipment : EDEN. This test facility is dedicated to simulate pressure and thermal environment which may be faced by balloons during missions on Earth and planetary (Mars, Titan, Venus, …) atmospheres.

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Transient Testing from LV/SC Coupled Analysis by new Shock Synthesis

This paper deals with the idea to replace the usual high level sine sweep test on shaker at system level by a low level one completed by a transient test in the same configuration, in order to be more representative of the real environment, thus limiting over testing and improving the payload comfort. The problem of the transient test specification is first discussed. The proposed solution is to derive from LV/SC coupled analyses a shock response spectrum corresponding to two damping ratios. Then, the question of adequate shock synthesis is tackled. A new method with a given spectrum is considered for better potential and accuracy than the usual wavelets. A campaign on the Intespace bishaker devoted to system level showed its capability to perform the resulting test. First investigations to extend this approach to two spectra have shown encouraging results.

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Thermal-Vacuum Chamber Refurbishment

In the framework of its maintenance program, Intespace has started refurbishing progressively its thermal-vacuum chambers. The 3 m3 was built in the seventies and has already been refurbished several times. However last time was in 2000, the Control System was still in manual mode, which was making the TVaC operation too expensive with respect to the market prices. It was then decided to start by this test facility as it was also considered as not strategic (Intespace has other test facility of the same size) and could then be blocked for a long duration.

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Dynaworks 7 quick start guide

The new Dynaworks 7 version will offer unprecedented user experience while providing a powerful data management system. The addition of a first version of Dydgets opens up unlimited prospects for processing and tracking the analysis process. A new page opens for us and our clients with a great number of functionalities to come. Don't hesitate to contact us and send us your feedback.

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Accurate determination of an inertia tensor

The measurement of the physical properties of a satellite at Intespace is performed using a facility working in free rotation for the center of gravity and in torsion pendulum for the inertia. It allows a high accuracy when directly used and can be adapted to the determination of the 6 components of the inertia tensor by using two braces. Assuming a careful and rigid assembly, the accuracy is better than 1 %,as verified for specimens from 35 to 200 kg. This facility, initially devoted to the needs of satellites with up to several tons, can therefore provide a good accuracy with much smaller specimens.

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ADAPTER FOR AXIAL VIBRATIONS OF LARGE SPECIMENS

As the expander head of the Intespace 320 kN MVS facility (two coupled shakers) was limited to a diameter of about 2 meters, it didn’t cover the needs for larger specimens such as a spacecraft compatible with the Ariane Ø 2624 mm bolted interface, or large antenna reflectors. For that purpose, an adapter with a capability up to 3 meters was designed with two possible configurations : on the expander head for the heavy specimens, or directly on the moving coils for light specimens which don’t need central bearing but may require higher levels. This leads to a conical structure completed by a cylinder and vertical ribs for a total mass less than 1500 kg and a first resonance frequency beyond 200 Hz.

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ASTRIUM ST tests exploitation system

This document presents Sig@re, the ASTRIUM ST software application system and database for tests results delivery, exploitation and archiving. The analyzed results, coming from all company programs,constitute over the time a priceless information database.

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