Orion Multi-Purpose Crew Vehicle Solving and Mitigating the Two Main Parachute Pendulum Problem

Ali, Yasmin; Sommer, Bruce G.; Troung, Tuan; Anderson, Brian P.; Madsen, Chris

doi:10.2514/6.2017-4056

Cited by 2 publications

(4 citation statements)

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“…2 Thus it was assumed that if the canopy planform could be made more aerodynamically stable, the pendulum motion could be mitigated. This allowed the test team to pursue testing on single canopies in the wind tunnel to try to improve stability with reasonable levels of blockage.…”

Section: Assumptionsmentioning

confidence: 99%

“…These assessments showed an unacceptable risk to the spacecraft structure. 2 The Orion Program asked the CPAS team to investigate design changes to the main parachutes that could help mitigate the pendulous motion.…”

Section: Introductionmentioning

confidence: 99%

“…During this effort they considered many possible causes and their work included root cause diagrams, static aerodynamic analyses using rigid-body Computational Fluid Dynamics (CFD), dynamic aerodynamic extraction of the EDU parachutes from drop test data, wind assessments, and parachute-capsule motion reconstruction. 2 In the Pendulum Action Team's report, they noted:…”

Section: Introductionmentioning

confidence: 99%

“…3 In actuality, the pendulum mitigation efforts involved much more than the parachute designs in that the Orion Program also considered changes to GN&C designs as well as a number of structural assessments. 2 While not discussed in detail in this paper, a pictorial view of the work performed by the CPAS team as part of the pendulum mitigation activities is shown in Figure 2. This paper documents the sub-scale wind tunnel test executed in the National Full-Scale Aerodynamics Complex (NFAC) 80x120-ft Wind Tunnel of 35% scale versions of the Orion main parachutes.…”

Section: Introductionmentioning

confidence: 99%

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Sub-Scale Orion Parachute Test Results From the National Full-Scale Aerodynamics Complex 80- by 120-ft Wind Tunnel

Anderson

Greathouse

Powell

et al. 2017

24th AIAA Aerodynamic Decelerator Systems Technology Conference

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A two-week test campaign was conducted in the National Full-Scale Aerodynamics Complex 80x120-ft Wind Tunnel in support of Orion parachute pendulum mitigation activities. The test gathered static aerodynamic data using an instrumented, 3-tether system attached to the parachute vent in combination with an instrumented parachute riser. Dynamic data was also gathered by releasing the tether system and measuring canopy performance using photogrammetry. Several canopy configurations were tested and compared against the current Orion parachute design to understand changes in drag performance and aerodynamic stability. These configurations included canopies with varying levels and locations of geometric porosity as well as sails with increased levels of fullness. In total, 37 runs were completed for a total of 392 data points. Immediately after the end of the testing campaign a down-select decision was made based on preliminary data to support follow-on sub-scale air drop testing. A summary of a more rigorous analysis of the test data is also presented.

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Section: Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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