DI-SESS-82492
Structural Coupling Test Report
Provides data for the detailed evaluation of the sensitivity of the air vehicle's automatic flight control system to structural response, used to validate or update analytical models.
Approval DateJuly 9, 2025
AMSC NumberF10578
Preparing Activity11 (AFLCMC/EZFS)
Project NumberSESS-2025-013
OPR—
DTIC ApplicableNo
GIDEP ApplicableNo
Limitation—
Applicable Forms—
Approval Limitation—
Form Version—
DID Formatfree_text
963C CompliantYes
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
Application & Interrelationship
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Use & Relationship
The Structural Coupling Test Report provides the data for the detailed evaluation of the sensitivity of the air vehicle's automatic flight control system to structural response and follow-on aeroservoelastic analyses. The principal use is to validate or update analytical models.
a. This Data Item Description (DID) is applicable to any contract for which an automated flight control system is being developed, the flight control laws are being modified for said system, or a structural coupling test (SCT) is required.
b. This DID contains the format, content, and intended use information for the data deliverable resulting from the work task described in section 5 of MIL-STD-1530, Aircraft Structural Integrity Program (ASIP) (copies of this document are available online at https://quicksearch.dla.mil).
c. This DID supersedes DI-MISC-81387, Airframe Rigidity Test Report (copies of this document are available online at https://quicksearch.dla.mil).
Preparation Instructions
1Reference DocumentsThe applicable issue of the documents cited herein, including their approval dates and dates of any applicable amendments, notices, and revisions, shall be as specified in the contract.
2FormatThe Structural Coupling Test Report shall be in the contractor's format.
3ContentThe Structural Coupling Test Report shall describe the contractor's analyses and test activities associated with characterizing the flight control systems open and closed loop response to the elastic modes of the air vehicle structure. The report shall contain the results and findings from the analyses and tests used to validate and update the aeroservoelastic analyses.
3.1The Structural Coupling Test Report shall be based on the interpretation and evaluation of tests and analysesand shall include the following:
3.1.1Descriptions and photographs of the suspension system, test instrumentation, special test equipment, and air vehicle configurationsincluding fuel states, landing gear configurations, and store loadings. Differences in the mass and structural configuration of the flight test vehicle and the SCT air vehicle shall be noted.
3.1.2Descriptions of the methods used for selecting test instrumentation types, test instrumentation capabilities, and test measurement locations
3.1.3Description of the methods used for orienting sensors to airframe's coordinate system(e.g., mounting blocks versus coordinate transformation).
3.1.4Description of the methods used for mounting instrumentation
3.1.5Specifications for all test instrumentation
3.1.6Descriptions of the test procedures, test conditions, test methods, data acquisition system, and methods of data reduction analysis
3.1.7Copy of the final version of the test plan
3.1.8Description of the version of the flight control laws usedincluding any test-specific modifications.
3.1.9Description of the automatic flight control system architecture for all axesincluding the location of sensors, as well as diagrams and schematics of software filters, test signal injection points, and loop breaks.
3.1.10Description of the methods used for selecting test cases, including nominal and failure states
3.1.11Copy of the test matrix as planned to be executed
3.1.12Definition of the measurement units including axis labels for plots and figures
3.1.13Plots comparing measured control law frequency response in all axes(bode plots) to pre-test analysis.
3.1.14Plots of the structural transfer functions versus frequency for accelerations and rates
3.1.15Copy of the test log as executed
3.1.16Comparison of the measured gain and phase margin results for testing with the pre-test analysisincluding the resolution of all test discrepancies and anomalies.
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