Aerospace

Design Qualification of the Jupiter Icy Moons Explorer JENI Instrument using the LS-DYNA Frequency Domain Suite

In 2022 the European Space Agency (ESA) will launch the JUpiter ICy moons Explorer (JUICE) for an 11-year mission to the Jovian system. The Particle Environment Package (PEP) suite of sensors includes the Jovian Energetic Neutrals and Ions sensor (JENI), designed, built, and qualified by The Johns Hopkins University Applied Physics Laboratory. The requirements established to ensure JENI withstands the launch environment include a first instrument mode above 140 Hz and positive structural margin when subjected to 39g per axis quasi-static analyses and random vibration analyses totaling up to 9.12 grms.

Undamped Extension of a Nose Landing Gear

In aviation, components are categorized based on the consequences of a failure. This categorization significantly determines the development costs, test quantities and maintenance cost. A simulation can show how serious such a failure can be and thus simplify the classification of the components and finally may reduce costs. This paper describes the simulation of the undamped extension of a nose landing gear of an aircraft. Normally, a hydraulic cylinder is used to extend the landing gear in a controlled manner. The simulation will investigate what happens when this hydraulic cylinder fails completely. Then the landing gear drops down when opening the flaps simply due to its own weight and pushes hard into its end stop. The simulation should show, if afterwards a safe landing is possible.