Validation of a Cargo Airdrop Software Simulator

Cuthbert, Peter; Desabrais, Kenneth J.

doi:10.2514/6.2003-2133

Cited by 33 publications

(10 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The DSS was developed and later validated by NASA Johnson Space Center and US Army Soldier Center in Natick, and used to provide analyses supporting numerous cargo drop tests conducted by the X-38 program [5][6][7] . When starting with the own development, the DSS was taken as example, but in the end, many features were realized differently.…”

Section: Conceptmentioning

confidence: 99%

Coupled Simulation of Cargo Airdrop from a Generic Military Transport Aircraft

Jann

2011

21st AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

View full text Add to dashboard Cite

The paper presents a cargo airdrop simulation that was developed by the German Aerospace Center (DLR), Institute of Flight Systems, for the evaluation and assessment of airdrop missions in future military transport aircraft applications. Payload extraction by parachute, gravity drop and airdrop without parachute were implemented, simulated and visualized. The cargo airdrop simulation is realized as a 2-dimensional simulation, focusing on the dynamics in the longitudinal plane. The payload simulation can be run stand-alone or coupled with the simulation of a generic military transport aircraft. The coupling allows studying the interaction between aircraft and payload and predicting the dynamic behavior of both systems during and after the drop. Although the main application is the analysis of the seconds just around the payload separation, the simulation can be continued for any time longer, e.g. until payload touchdown. In order to include pilot interaction, the coupled simulation was transferred to a real-time environment and was run on a cockpit simulator.

show abstract

Section: Conceptmentioning

confidence: 99%

Coupled Simulation of Cargo Airdrop from a Generic Military Transport Aircraft

Jann

2011

21st AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

View full text Add to dashboard Cite

show abstract

“…DSS has increased capabilities for simulating multiple aspects of a drop test including payload forces, dynamic pitching motions, and payload trajectory during the entire descent phase 5 . The simulation is more complex to execute compared to DSSA and DTV-SIM and can be used to evaluate test vehicle concepts or predict test performance.…”

Section: ) Dssmentioning

confidence: 99%

Simulating New Drop Test Vehicles and Test Techniques for the Orion CEV Parachute Assembly System

Morris

Fraire

Bledsoe

et al. 2011

21st AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

View full text Add to dashboard Cite

The Crew Exploration Vehicle Parachute Assembly System (CPAS) project is engaged in a multi-year design and test campaign to qualify a parachute recovery system for human use on the Orion Spacecraft. Test and simulation techniques have evolved concurrently to keep up with the demands of a challenging and complex system. The primary simulations used for preflight predictions and post-test data reconstructions are Decelerator System Simulation (DSS), Decelerator System Simulation Application (DSSA), and Drop Test Vehicle Simulation (DTV-SIM). The goal of this paper is to provide a roadmap to future programs on the test technique challenges and obstacles involved in executing a large-scale, multi-year parachute test program. A focus on flight simulation modeling and correlation to test techniques executed to obtain parachute performance parameters are presented.

show abstract

“…In both DSS 7 and DCLDYN 8 , the added mass rate is filtered so that sharp changes in the time derivative of R p do not produce equivalent sharp changes in mass rate. These filters are either proprietary or not well documented and it is unclear how the underlying physics was validated.…”

Section: Added Mass Ratementioning

confidence: 99%

“…As a result, load predictions are produced by different flight simulations. The two primary flight simulations are DSS 7 and DCLDYN. 8 Each has a different heritage and uses different added mass models.…”

Section: Introductionmentioning

confidence: 99%

Proposed Framework for Determining Added Mass of Orion Drogue Parachutes

Fraire

Dearman

Morris³

2011

21st AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

View full text Add to dashboard Cite

The Crew Exploration Vehicle (CEV) Parachute Assembly System (CPAS) project is executing a program to qualify a parachute system for a next generation human spacecraft. Part of the qualification process involves predicting parachute riser tension during system descent with flight simulations. Human rating the CPAS hardware requires a high degree of confidence in the simulation models used to predict parachute loads. However, uncertainty exists in the heritage added mass models used for loads predictions due to a lack of supporting documentation and data. Even though CPAS anchors flight simulation loads predictions to flight tests, extrapolation of these models outside the test regime carries the risk of producing non-bounding loads. A set of equations based on empirically derived functions of skirt radius is recommended as the simplest and most viable method to test and derive an enhanced added mass model for an inflating parachute. This will increase confidence in the capability to predict parachute loads. The selected equations are based on those published in "A Simplified Dynamic Model of Parachute Inflation" by Dean Wolf. An Ames 80x120 wind tunnel test campaign is recommended to acquire the reefing line tension and canopy photogrammetric data needed to quantify the terms in the Wolf equations and reduce uncertainties in parachute loads predictions. Once the campaign is completed, the Wolf equations can be used to predict loads in a typical CPAS Drogue Flight test. Comprehensive descriptions of added mass test techniques from the Apollo Era to the current CPAS project are included for reference.

show abstract

Validation of a Cargo Airdrop Software Simulator

Cited by 33 publications

References 2 publications

Coupled Simulation of Cargo Airdrop from a Generic Military Transport Aircraft

Coupled Simulation of Cargo Airdrop from a Generic Military Transport Aircraft

Simulating New Drop Test Vehicles and Test Techniques for the Orion CEV Parachute Assembly System

Proposed Framework for Determining Added Mass of Orion Drogue Parachutes

Contact Info

Product

Resources

About