Real-Time Frequency Response Estimation Using Joined-Wing SensorCraft Aeroelastic Wind-Tunnel Data

Grauer, Jared A.; Heeg, Jennifer; Morelli, Eugene A.

doi:10.2514/6.2012-4641

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…. , n y and k ∈ K j [2,[46][47][48]. Note that, similar to the Fourier transforms, the frequency responses are only computed at the harmonic frequencies of the respective input because those are the only frequencies at which the input-output data have sufficient information.…”

Section: Direct Approach For Estimating Frequency Responsesmentioning

confidence: 99%

Frequency Response Estimation for Multiple Aircraft Control Loops Using Orthogonal Phase-Optimized Multisine Inputs

Grauer

2022

Processes

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The latest advances made at NASA for simultaneous excitation in multiple axes and the identification of frequency responses for aircraft flight systems are discussed in this paper. These techniques are extended in the prospect of identifying multiple dynamics and control loops for multiple axes. Recent applications with flight test data and simulation data are also presented, along with a discussion of the practical aspects of the approach. A demonstration is also provided, using a simulation model for the X-59 airplane in which frequency responses for the bare-airframe, closed-loop, and broken-loop (both for the actuator and the sensor) dynamics were identified from a single 60 s maneuver. The results indicate that this approach can significantly shorten the duration of flight tests and Monte Carlo simulations to save time and costs, and can produce results in real time.

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Section: Direct Approach For Estimating Frequency Responsesmentioning

confidence: 99%

Frequency Response Estimation for Multiple Aircraft Control Loops Using Orthogonal Phase-Optimized Multisine Inputs

Grauer

2022

Processes

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“…The recursive discrete Fourier transform has been applied successfully in flight tests and in wind-tunnel tests for real-time dynamic modeling in the frequency domain 5,20,22,[26][27][28][29][30][31][32][33] .…”

Section: F Recursive Discrete Fourier Transformmentioning

confidence: 99%

“…The combination of orthogonal optimized multisines and Eq. (36) has been applied successfully in wind tunnel tests with many inputs and outputs 29 , and in flight tests 27,28,[30][31][32][33] to efficiently compute frequency responses from time series data. This general approach is also the basis of effective methods for real-time frequency response estimation, both in the time domain 27 , and in the frequency domain [28][29][30][31][32][33] .…”

Section: Figure 18 Longitudinal Optimized Multisine Datamentioning

confidence: 99%

Practical Aspects of the Frequency Domain Approach for Aircraft System Identification

Morelli

Grauer

2018

2018 Atmospheric Flight Mechanics Conference

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Practical aspects of the frequency-domain approach for aircraft system identification are explained and demonstrated. Topics related to experiment design, flight data analysis, and dynamic modeling are included. For demonstration purposes, simulated time series data and simulated flight data from an F-16 nonlinear simulation with realistic noise are used. This approach enables detailed evaluations of the techniques and results, because the true characteristics of the data and aircraft dynamics are known for the simulated data. Analytical techniques and practical considerations are examined for the finite Fourier transform, nonparametric frequency response estimation, parametric modeling in the frequency domain, experiment design for frequency-domain modeling, data analysis and modeling in the frequency domain, and real-time calculations. Flight data from a subscale jet transport aircraft are used to demonstrate some of the techniques and technical issues.

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Ground Servoelasticity Test and Analysis of UAVs With Large Aspect Ratio and Joined-Wing Layout

Ying,

Zhuolin,

Zijian

et al. 2024

IEEE Access

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Real-Time Frequency Response Estimation Using Joined-Wing SensorCraft Aeroelastic Wind-Tunnel Data

Cited by 5 publications

References 12 publications

Frequency Response Estimation for Multiple Aircraft Control Loops Using Orthogonal Phase-Optimized Multisine Inputs

Frequency Response Estimation for Multiple Aircraft Control Loops Using Orthogonal Phase-Optimized Multisine Inputs

Practical Aspects of the Frequency Domain Approach for Aircraft System Identification

Ground Servoelasticity Test and Analysis of UAVs With Large Aspect Ratio and Joined-Wing Layout

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