Formulation and analysis of launch vehicle maneuvering loads

Dotson, K. W.; Tiwari, Shashi Bhushan

doi:10.2514/6.1996-1232

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…However, matrix formulations of aerodynamic sti!ness and damping exist for the computation of wind-induced launch vehicle loads (Dotson & Tiwari 1996), and could conceivably be developed for transonic alternating #ow forces. In this case, modal coupling, represented by o!-diagonal aerodynamic sti!ness and damping terms, would be computed and the system response would be composed of numerous modal contributors.…”

Section: Single-mode Aeroelastic Couplingmentioning

confidence: 99%

Launch Vehicle Buffeting With Aeroelastic Coupling Effects

Dotson

Baker

Sako

2000

Journal of Fluids and Structures

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Section: Single-mode Aeroelastic Couplingmentioning

confidence: 99%

Launch Vehicle Buffeting With Aeroelastic Coupling Effects

Dotson

Baker

Sako

2000

Journal of Fluids and Structures

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“…[5][6][7][8]. In addition, other analyses are performed to estimate loads due to items such as wind measurement error and vehicle dispersions from the nominal parameters used in the analyses.…”

Section: Other Load Contributorsmentioning

confidence: 99%

A refined and less conservative day-of-launch atmospheric flight loads analysis approach

Kabe

Spiekermann

Kim

et al. 1999

40th Structures, Structural Dynamics, and Materials Conference and Exhibit

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources gathering and mahtainino the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for redudng this burden, A day-of-launch atmospheric flight loads analysis approach that reduces conservatism by better defining the components of flight loads that have to be treated statistically and those that can be established with measured wind profiles just prior to launch is described. The approach introduces the concept of removing from measured day-oflaunch winds the rapidly varying features, and only using the more slowly changing components in day-of-launch, placard calculations. The proposed approach takes advantage of a recently-developed methodology that defines the spectral boundary, as a function of time, between wind components that can be considered slowly varying and those that change rapidly and, hence, have to be addressed statistically. SUBJECT TERMSAtmospheric flight loads, launch vehicles, turbulence, day-of-launch placards AbstractA day-of-launch atmospheric flight loads analysis approach that reduces conservatism by better defining the components of flight loads that have to be treated statistically and those that can be established with measured wind profiles just prior to launch is described. The approach introduces the concept of removing from measured day-of-launch winds the rapidly-varying features, and only using the more slowly-changing components in the load calculations performed just prior to launch. The proposed approach takes advantage of two recent developments. The first development defines the spectral boundary, as a function of time, between wind components that can be considered slowly varying and those that change rapidly and, hence, have to be addressed statistically. The second development provides an approach for calculating gust loads due only to the turbulent component of the winds, and thus, eliminates the need to include these wind components in the load calculations performed just prior to launch.

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“…Many launch vehicles use an approach 13 "' 5 where the wind velocity, as a function of altitude, is measured prior to launch-two hours or less is typical-and smoothed (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%