Showing papers by "Jer-Chyi Liou published in 2011"
TL;DR: A new sensitivity study on using ADR to stabilize the future LEO debris environment is described, using the NASA long-term orbital debris evolutionary model, LEGEND, to quantify the effects of several key parameters, including target selection criteria/constraints and the starting epoch of ADR implementation.
320 citations
TL;DR: In this article, a series of hypervelocity impact tests of acoustic sensors mounted on thin plates (aluminium and Duroid plates) were conducted for impacts of sub mm-mm scale projectiles.
9 citations
TL;DR: In this paper, the authors compared two different approaches to calculate the average cross-sectional area of breakup fragments and compared the two approaches in terms of size and thickness of the fragments.
7 citations
TL;DR: In this article, the results from all seven impact tests carried out in 2008 are shown in this paper and compared with the NASA standard breakupmodel to demonstrate potential improvements of the model in the future.
Abstract: To predict the future orbital environments, it is necessary to know outcome of the satellite fragmentation. The NASA standard breakup model is designed to describe the outcome of typical satellite fragmentation. This model is an empirical model and themajor data sources are the 1980s on-orbit satellite breakup events and the ground-based Satellite Orbit Debris Characterization Impact Test series conducted in early 1990s. The target cubic satellites ranged from 15 to 20 cm in size and about 1000 g in mass. Results from all seven impact tests carried out in 2008 are shown in this paper and compared with the NASA standard breakupmodel to demonstrate potential improvements of the model in the future.
3 citations
TL;DR: In this article, the authors describe acoustic systems currently under development for measuring the flux of micrometeorite and orbital debris in space, and detecting damaging impacts when they occur on spacecrafts or habitats.
Abstract: This paper briefly describes acoustic systems currently under development for measuring the flux of micrometeorite and orbital debris in space, and detecting damaging impacts when they occur on spacecrafts or habitats. While the particles of interest here are typically small (less than 5‐mm diameter) their high speed (greater than 5 km/s) makes an impact quite energetic. At these speeds an impact typically leaves a hole or crater ten times the diameter of the particle, so particles as small as 50 μm can disable a system or create a hazard. The systems described here span a range of purposes. One system is focused on astronaut safety and uses an array of piezoelectric sensors to detect, localize, and assess damage on habitats. Another is focused on scientific data collection and uses a large impact‐area diaphragm instrumented with fiber optic sensors for measuring particle size distribution. Other systems use combinations of acoustic and non‐acoustic sensors to provide additional information about the natu...
1 citations