Decentralized state estimation for flexible space structures

Mallory, Gregory J. W.; Miller, David W.

doi:10.2514/6.1999-1307

Cited by 3 publications

(2 citation statements)

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“…Mallory's pre-balancing method (gmxobal.m) [85] was successfully applied to solve this problem, since the pre-balancing algorithm removes the unobservable/uncontrollable states before the inversion. This leads to a balanced, reduced, minimal and well-conditioned system and accurate answers for the RMS and sensitivities.…”

Section: Imentioning

confidence: 99%

Multivariable Isoperformance Methodology for Precision Opto-Mechanical Systems

Weck

Ladislas

2002

43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Precision opto-mechanical systems, such as space telescopes, combine structures, optics and controls in order to meet stringent pointing and phasing requirements. In this context a novel approach to the design of complex, multi-disciplinary systems is presented in the form of a multivariable isoperformance methodology. The isoperformance approach first finds a point design within a given topology, which meets the performance requirements with sufficient margins. The performance outputs are then treated as equality constraints and the nonuniqueness of the design space is exploited by trading key disturbance, plant, optics and controls parameters with respect to each other.Three algorithms (branch-and-bound, tangential front following and vector spline approximation) are developed for the bivariate and multivariable problem. The challenges of large order models are addressed by presenting a fast diagonal Lyapunov solver, apriori error bounds for model reduction as well as a governing sensitivity equation for similarity transformed state space realizations. Specific applications developed with this technique are error budgeting and multiobjective design optimization. The goal of the multiobjective design optimization is to achieve a design which is pareto optimal, such that multiple competing objectives can be satisfied within the performance invariant set. Thus, situations are avoided where very costly and hard-to-meet requirements are levied onto one subsystem, while other subsystems hold substantial margins.An experimental validation is carried out on the DOLCE laboratory testbed. The testbed allows verification of the predictive capability of the isoperformance technique on models of increasing fidelity. A comparison with experimental results, trading excitation amplitude and payload mass, is demonstrated. The predicted performance contours match the experimental data very well at low excitation levels, typical of the disturbance environment on precision opto-mechanical systems. The relevance of isoperformance to space systems engineering is demonstrated with a comprehensive NEXUS spacecraft dynamics and controls analysis. It is suggested that isoperformance is a useful concept in other fields of engineering science such as crack growth calculations in structures. The isoperformance approach enhances the understanding of complex opto-mechanical systems beyond the local neighborhood of a particular point design. Sharon-Leah Brown provided encouragement and professional financial management.

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Section: Imentioning

confidence: 99%

Multivariable Isoperformance Methodology for Precision Opto-Mechanical Systems

Weck

Ladislas

2002

43rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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“…Khulief [8] has proposed the control of a rotating beam mounted on a rigid hub using a linear quadratic regulator, which required the placement of the sensor and actuator on the rotating beam. Lee and Eillott [9], Yousefi-Koma and Vukovich [10], Zimmerman and Cudney [11], and Mallory and Miller [12] all have also suggested placing sensors at various locations along the span of the beam for monitoring and control purposes. However, their research has focused on either non-rotating beams or large space structures.…”

Section: Introductionmentioning

confidence: 99%

Optimal Vibration Estimation of a Non-Linear Flexible Beam Mounted on a Rotating Compliant Hub

El-Sinawi

Hamdan

2003

Journal of Sound and Vibration

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Experimental Validation of Multidisciplinary Isoperformance Methodology

Howell¹,

Weck²

2002

9th AIAA/ISSMO Symposium on Multidisciplinary Analysis and Optimization

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Isoperformance is a methodology for predicting contours or n-dimensional surfaces of equal system performance in a trade space composed of design parameters with widely varying bounds. This differs from the traditional point design technique in that a designer can work backwards from a chosen performance level and, using a computer model, can be presented with several different system designs which achieve that level and have a certain cost. By investigating the relationship between contours of isoperformance in model and experiment, modeling rules and error bounds on the computer model can be derived. This will aid greatly in future spacecraft design, especially for space interferometry missions.

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Decentralized state estimation for flexible space structures

Cited by 3 publications

References 0 publications

Multivariable Isoperformance Methodology for Precision Opto-Mechanical Systems

Multivariable Isoperformance Methodology for Precision Opto-Mechanical Systems

Optimal Vibration Estimation of a Non-Linear Flexible Beam Mounted on a Rotating Compliant Hub

Experimental Validation of Multidisciplinary Isoperformance Methodology

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