Longitudinal Control and Footprint Analysis for a Reusable Military Launch Vehicle

Longitudinal Control and Footprint Analysis for a Reusable Military Launch Vehicle PDF

Author: Anhtuan D. Ngo

Publisher:

Published: 2003

Total Pages: 12

ISBN-13:

DOWNLOAD EBOOK →

In this paper, we will examine a configuration for a reusable military launch vehicle (RMLS) concept. This configuration allows for the vehicle to land in an inverted attitude. Such inverted landing improves the turnaround time of the vehicle by reducing the maintenance requirements of the vehicle's thermal protection system. An analysis is performed to examine the impacts by the configuration on stability, control, and footprint for an RMLS configuration.

Longitudinal Control and Footprint Analysis for a Reusable Military Launch Vehicle

Longitudinal Control and Footprint Analysis for a Reusable Military Launch Vehicle PDF

Author: Anhtuan D. Ngo

Publisher:

Published: 2003

Total Pages: 10

ISBN-13:

DOWNLOAD EBOOK →

In this paper, we will examine a configuration for a reusable military launch vehicle (RMLS) concept. This configuration allows for the vehicle to land in an inverted attitude. Such inverted landing improves the turnaround time of the vehicle by reducing the maintenance requirements of the vehicle's thermal protection system. An analysis is performed to examine the impacts by the configuration on stability, control, and footprint for an RMLS configuration.

Footprint Determination for Reusable Launch Vehicles Experiencing Control Effector Failures

Footprint Determination for Reusable Launch Vehicles Experiencing Control Effector Failures PDF

Author: David B. Doman

Publisher:

Published: 2002

Total Pages: 10

ISBN-13:

DOWNLOAD EBOOK →

The ability to compute the maximum area on the earth's surface (footprint) reachable by an autonomous air vehicle can be useful in planning for the vehicle's safe operations. The information can be important when the vehicle experiences subsystem failures causing it to be unable to maintain its nominal performance. In this paper, we present a method to calculate the footprint of a reusable launch vehicle that experiences a failure in one or more of its aero-control surfaces. During a control effector failure, the maximum attainable moments of the vehicle are reduced, which may decrease the range of conditions that the vehicle can maintain a trimmed condition. Additionally, the lift and drag characteristics of the vehicle can change when control effectors are moved to off-nominal positions to correct for moment imbalance caused by failures or damage. As a result, the footprint of the vehicle is reduced. A technique for calculating the available effectiveness of the aero-control surfaces is used in conjunction with a footprint generation algorithm to include the effects of rotational trim on the vehicle footprint.

Concepts of Operations for a Reusable Launch Vehicle

Concepts of Operations for a Reusable Launch Vehicle PDF

Author: Michael A. Rampino

Publisher:

Published: 1997

Total Pages: 68

ISBN-13:

DOWNLOAD EBOOK →

The United States is embarked on a journey toward maturity as a spacefaring nation. One key step along the way is development of a reusable launch vehicle (RLV). The most recent National Space Transportation Policy (August 1994) assigned improvement and evolution of current expendable launch vehicles to the Department of Defense while National Aeronautical Space Administration (NASA) is responsible for working with industry on demonstrating RLV technology. The purpose of this study is to help ensure the US military, especially the USAF, is prepared to take advantage of RLVs should the NASA-led effort to develop an RLV demonstrator prove successful. The focus of this study is an explanation of how the US military could use RLVs, by describing and analyzing two concepts of operations. Four major conclusions resulted from the analysis. First, RLVs have military potential. They can perform a variety of missions including responsive spacelift, reconnaissance, and strike. However, the economic feasibility of using RLVs for earth-to-earth transportation is questionable. Second, design choices for an operational RLV will have effects on risk, cost, capability, and operations efficiency. Trade-offs will have to be made between NASA, commercial, and military requirements if all three parties are to use the same fleet of RLVs. Third, increased investment in propulsion technology development is warranted to ensure success. Fourth, the top priority for the RLV program, even from the military's perspective, should remain cheap and responsive access to space. The research led to three recommendations. First, the US military should become a more active participant in the RLV program to ensure its requirements are defined and incorporated. Second, America should not pursue development of operational RLVs before the technology is ready.

Reusable Launch Vehicle

Reusable Launch Vehicle PDF

Author: National Research Council

Publisher: National Academies Press

Published: 1996-01-08

Total Pages: 98

ISBN-13: 0309175860

DOWNLOAD EBOOK →

The key to opening the use of space to private enterprise and to broader public uses lies in reducing the cost of the transportation to space. More routine, affordable access to space will entail aircraft-like quick turnaround and reliable operations. Currently, the space Shuttle is the only reusable launch vehicle, and even parts of it are expendable while other parts require frequent and extensive refurbishment. NASA's highest priority new activity, the Reusable Launch Vehicle program, is directed toward developing technologies to enable a new generation of space launchers, perhaps but not necessarily with single stage to orbit capability. This book assesses whether the technology development, test and analysis programs in propulsion and materials-related technologies are properly constituted to provide the information required to support a December 1996 decision to build the X-33, a technology demonstrator vehicle; and suggest, as appropriate, necessary changes in these programs to ensure that they will support vehicle feasibility goals.

Optimal Trajectory Reconfiguration and Retargeting for the X-33 Reusable Launch Vehicle

Optimal Trajectory Reconfiguration and Retargeting for the X-33 Reusable Launch Vehicle PDF

Author: Patrick J. Shaffer

Publisher:

Published: 2004-09-01

Total Pages: 151

ISBN-13: 9781423519539

DOWNLOAD EBOOK →

This thesis considers the problem of generating optimal entry trajectories for a reusable launch vehicle following a control surface failure. The thesis builds upon the work of Dr. David Doman, Dr. Michael Oppenheimer and Dr. Michael Bolender of the Air Vehicles Directorate, Air Force Research Lab Dayton Ohio. The primary focus of this work is to demonstrate the feasibility of inner loop reconfiguration and outer loop trajectory retargeting and replanning for the X-33 reusable launch vehicle (RLV) following the imposition of a control surface failure. The trajectory generation model employs path constraints generated by an AFRL trim deficiency algorithm coupled with an inner loop control allocator and aerodynamic database that captures the full 6-DOF vehicle aerodynamic effects while utilizing an outer loop 3-DOF model. The resulting optimal trajectory does not violate the trim deficiency constraints and provides additional margins for trajectories flown during failure conditions. The footprints generated by the thesis show that contemporary footprint analysis for vehicles experiencing control surface failures are overly optimistic when compared to those footprints that consider vehicle aerodynamic stability and realistic landable attitudes at the threshold of the landing runway. The results of the thesis also show the performance reductions resulting from decoupling the inner and outer loop and that trajectories can be generated to the landing runway without using a region of terminal area energy management.

Life Cycle Cost Assessments for Military Transatmospheric Vehicles

Life Cycle Cost Assessments for Military Transatmospheric Vehicles PDF

Author:

Publisher:

Published: 1997

Total Pages: 0

ISBN-13:

DOWNLOAD EBOOK →

The X-33 and X-34 technology demonstration programs currently under way by NASA may ultimately lead to a commercial reusable launch vehicle (RLV). The first flight test for the X-33 vehicle is planned for early 1999. With NASA fully committed to the development of this first-ever completely reusable vehicle, it is prudent for the Air Force to examine the potential benefits, requirements, and costs for a military transatmospheric vehicle (TAV). This vehicle would take advantage of technologies developed during RLV-related programs. Although similar in concept, a military TAV may differ significantly in design and in capability from an RLV produced to satisfy commercial market needs.

Wingless Flight

Wingless Flight PDF

Author: R. Dale Reed

Publisher: University Press of Kentucky

Published: 2014-07-15

Total Pages: 256

ISBN-13: 0813161606

DOWNLOAD EBOOK →

Most lifting bodies, or "flying bathtubs" as they were called, were so ugly only an engineer could love them, and yet, what an elegant way to keep wings from burning off in supersonic flight between earth and orbit. Working in their spare time (because they couldn't initially get official permission), Dale Reed and his team of engineers demonstrated the potential of the design that led to the Space Shuttle. Wingless Flight takes us behind the scenes with just the right blend of technical information and fascinating detail (the crash of M2-F2 found new life as the opening credit for TV's "The Six Million Dollar Man"). The flying bathtub, itself, is finding new life as the proposed escape-pod for the Space Station.