EVALUATION METHOD OF THRUST OSCILLATIONS IN LARGE SRM - APPLICATION TO SEGMENTED SRM's

Ballereau, Séverine; Godfroy, Franck; Gallier, Stany; Orlandi, Olivier; Thepenier, J.; Robert, E.; Cesco, Nathalie

doi:10.2514/6.2011-6054

Cited by 7 publications

(2 citation statements)

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“…It is interesting to note that even with such minor changes in inhibitor length large deviations in vortex shedding frequencies were captured. This is consistent with prior research showcasing large deviations at smaller inhibitor lengths [34,37].…”

Section: Table 3 Convergence Test Of the Simplified Rocket Modelsupporting

confidence: 92%

A Coupling Analysis Approach to Capture Unexpected Behaviors in Ares 1

Kis

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Coupling of physics in large-scale complex engineering systems must be correctly accounted for during the systems engineering process. Preliminary corrections ensure no unanticipated behaviors arise during operation. Structural vibration of large segmented solid rocket motors, known as thrust oscillation, is a well-documented problem that can effect solid rocket motors in adverse ways. Within the Ares 1 rocket, unexpected vibrations deemed potentially harmful to future crew were recorded during late stage flight that propagated from the engine chamber to the Orion crew module. This research proposes the use of a coupling strength analysis during the design and development phase to identify potential unanticipated behaviors such as thrust oscillation. Once these behaviors and couplings are identified then a value function, based on research in Value Driven Design, is proposed to evaluate mitigation strategies and their impact on system value. The results from this study showcase a strong coupling interaction from structural displacement back onto the fluid flow of the Ares 1 that was previously deemed inconsequential. These findings show that the use of a coupling strength analysis can aid engineers and managers in identifying unanticipated behaviors and then rank order their importance based on the impact they have on value.

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Section: Table 3 Convergence Test Of the Simplified Rocket Modelsupporting

confidence: 92%

A Coupling Analysis Approach to Capture Unexpected Behaviors in Ares 1

Kis

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“…These frequencies correspond to acoustic modes of the gas inside the combustion channel of the booster. The existence of discontinuity areas and local peaks in the time-frequency plane is worth mentioning; those typical areas correspond to an interaction [52,53]. These pressure oscillations determine the loading applied to the rest of the structure and govern the global vibratory response.…”

Section: The Measurementsmentioning

confidence: 99%

A robust CRE-based approach for model updating using in situ measurements

Charbonnel¹,

Louf²,

Noac'h³

2013

Computers & Structures

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a b s t r a c tThis paper presents a systematic approach for comparing a numerical model to test results performed in situ on a structure with time-dependent behavior. A crucial issue for an engineer is to be able to assess the quality of models, based on a series of measurements. Dealing with in situ measurements as experimental reference for model updating involves two major difficulties: the excitations can be multiple and affected by large disturbances. The validation process we propose is based on the mechanical concept of Constitutive Relation Error (CRE) and aims at reducing the Lack Of Knowledge (LOK) attached to both the excitation forces and the parameters of the numerical model. The updated values can be computed inside confidence intervals that correspond to the lower contours of the CRE-based residual to minimize.The proposed method will be illustrated with a numerical example taken from the aerospace industry and applied for correcting a simple ARIANE 5 model by comparison with flight measurements.

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