{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp03_full320_20260801","cell_id":"invariant_mode_decomposition_design__aviation_aeronautics","trajectory_id":"R","attempt_index":0,"archetype_slug":"invariant_mode_decomposition_design","domain_slug":"aviation_aeronautics","decision":"CANDIDATE","problem_id":"coupled_aeroelastic_instability_hidden_by_channel_monitoring","causal_lever_id":"validated_modal_stability_margin_with_residual_drift_gates","proposal":{"problem":"During flight-envelope expansion, coupled airframe, control-surface, actuator, and aerodynamic dynamics can develop a weakly damped or unstable aeroelastic direction that is not salient in any single sensor channel. Coordinate-level limits may therefore look acceptable while the coupled state approaches flutter or another oscillatory instability. [HYPOTHESIS]","actors_substrate":["flight-test crew","flight-test engineers","aeroelasticity and flight-controls engineers","airworthiness authority","instrumented aircraft or validated aeroelastic test article","structural, actuator, air-data, and inertial measurements"],"observable_state":"Repeated maneuvers show correlated oscillations whose fitted frequency, damping, or shape changes with airspeed, configuration, or control-law setting, while individual measurements remain within ordinary limits. [HYPOTHESIS]","consequence":"An inadequately observed mode can lose damping before crews or channel alarms recognize a coherent instability, risking structural exceedance, loss of control, or an unnecessarily conservative halt to envelope expansion.","affected_objective":"Clear the flight envelope efficiently while maintaining positive, defensible stability margins and avoiding exposure to unrecognized coupled instability.","structural_mapping":[{"archetype_element":"A transformation acts on coupled variables","domain_realization":"A local state-transition or aeroelastic operator maps structural, aerodynamic, actuator, and flight-control states forward in time.","claim_kind":"INFERENCE"},{"archetype_element":"Hidden directions grow or decay under repetition","domain_realization":"Coupled bending, torsion, control-surface, and actuator patterns can be represented locally as modes with frequency and damping or discrete-time gain.","claim_kind":"INFERENCE"},{"archetype_element":"Surface metrics miss an unstable mode","domain_realization":"Per-channel limits need not reveal a dangerous linear combination of otherwise moderate measurements.","claim_kind":"HYPOTHESIS"},{"archetype_element":"Modes must map back to actionable coordinates","domain_realization":"Each flagged mode is traced to sensor participation and candidate changes in configuration, excitation, control law, or test boundary.","claim_kind":"INFERENCE"},{"archetype_element":"Residual and drift preserve validity","domain_realization":"Reconstruction error, modal rotation, spectral separation, and operating-point distance gate continued reliance on the model.","claim_kind":"INFERENCE"}],"component_map":[{"component":"Transformation Scope","status":"adapted","domain_realization":"One aircraft configuration, control law, mass state, altitude band, and bounded speed interval."},{"component":"State-Vector Definition","status":"direct","domain_realization":"Synchronized structural acceleration, strain, control-surface, actuator, inertial, and air-data states selected before fitting."},{"component":"Invariant Mode Basis","status":"direct","domain_realization":"Locally identified coupled aeroelastic state directions, reconciled with measured mode shapes."},{"component":"Modal Gain Spectrum","status":"adapted","domain_realization":"Eigenvalue magnitude or continuous-time damping and frequency, with uncertainty."},{"component":"Dominant Mode Selection Rule","status":"adapted","domain_realization":"Retain modes exceeding preregistered risk, outcome-sensitivity, or reconstruction-contribution thresholds."},{"component":"Stable/Unstable Mode Partition","status":"direct","domain_realization":"Classify modes as adequately damped, marginal, or unstable inside the declared window."},{"component":"Modal Intervention Map","status":"adapted","domain_realization":"Map configuration, control-law, excitation, and envelope-step changes to predicted modal-margin changes."},{"component":"Reconstruction Residual Check","status":"direct","domain_realization":"Compare retained-mode reconstruction with held-out measured responses and inspect structured residuals."},{"component":"Mode Drift Monitor","status":"direct","domain_realization":"Track damping, frequency, mode-shape rotation, ordering, and residual growth across successive test points."},{"component":"Interpretation Scope Contract","status":"direct","domain_realization":"State that conclusions are local, configuration-specific, uncertainty-bounded, and not proof of global nonlinear stability."},{"component":"Mode-Coupling Register","status":"direct","domain_realization":"Record near-degenerate, non-orthogonal, veering, or control-coupled modes that cannot be acted on independently."},{"component":"Local Linearization Window","status":"direct","domain_realization":"Bound validity by speed, altitude, amplitude, mass state, configuration, and control-law version."},{"component":"Spectral Gap Threshold","status":"adapted","domain_realization":"Require adequate separation and mode-identification confidence before assigning stable identities or reducing order."}],"mechanism_dispositions":[{"slug":"eigendecomposition_workflow","disposition":"selected_load_bearing","contribution_type":"CORE_CAUSAL","adaptation_or_rejection":"Decompose the explicit local aeroelastic state operator and retain uncertainty and conditioning diagnostics.","counterfactual_removal":"Without eigenpairs, the proposed coupled stability direction and margin are not defined."},{"slug":"modal_sensitivity_sweep","disposition":"selected_supporting","contribution_type":"OPERATIONAL","adaptation_or_rejection":"Perturb candidate controls and configurations within the local model to rank leverage and register cross-effects.","counterfactual_removal":"Modes remain detectable, but intervention ranking becomes less defensible."},{"slug":"modal_stability_analysis","disposition":"selected_load_bearing","contribution_type":"CORE_CAUSAL","adaptation_or_rejection":"Translate eigenvalues into damping, oscillation, marginality, and instability within the declared envelope window.","counterfactual_removal":"The decomposition would describe shapes without identifying the dangerous trajectory."},{"slug":"mode_shape_testing","disposition":"selected_load_bearing","contribution_type":"TEST_DESIGN","adaptation_or_rejection":"Use bounded ground or archived excitation-response data to validate analytical shapes and expose unmodeled boundary effects.","counterfactual_removal":"The analytical basis lacks an empirical hard gate before operational use."},{"slug":"network_spectral_centrality_analysis","disposition":"considered_rejected","contribution_type":"NONE","adaptation_or_rejection":"Node-importance ranking does not estimate aeroelastic stability or damping.","counterfactual_removal":"No causal or safety step changes."},{"slug":"power_iteration_probe","disposition":"considered_rejected","contribution_type":"NONE","adaptation_or_rejection":"A dominant-only estimate is unsafe when a secondary or near-degenerate mode may govern flutter margin.","counterfactual_removal":"Full-spectrum analysis already supplies the required modes without its dominant-mode ambiguity."},{"slug":"principal_component_analysis","disposition":"considered_rejected","contribution_type":"NONE","adaptation_or_rejection":"Variance directions are not necessarily dynamical stability directions; PCA may be exploratory but cannot carry the verdict.","counterfactual_removal":"The causal chain remains intact."},{"slug":"reduced_order_model","disposition":"selected_supporting","contribution_type":"OPERATIONAL","adaptation_or_rejection":"Project validated modes into a bounded surrogate for rapid shadow prediction of proposed envelope steps.","counterfactual_removal":"Analysis becomes slower, but mode identification and safety gates remain possible."},{"slug":"residual_reconstruction_test","disposition":"selected_load_bearing","contribution_type":"SAFETY_GUARDRAIL","adaptation_or_rejection":"Test held-out reconstruction error and residual structure before trusting retained modes.","counterfactual_removal":"Omitted dynamics could remain invisible while the reduced model appears stable."},{"slug":"singular_value_decomposition","disposition":"selected_supporting","contribution_type":"TEST_DESIGN","adaptation_or_rejection":"Use singular directions to diagnose conditioning and transient amplification when the local operator is non-normal.","counterfactual_removal":"Asymptotic eigenvalue stability remains available, but transient-growth and conditioning warnings weaken."},{"slug":"spectral_decomposition_report","disposition":"selected_supporting","contribution_type":"SAFETY_GUARDRAIL","adaptation_or_rejection":"Package margins, uncertainty, coupling, residuals, and prohibited interpretations for the test authority.","counterfactual_removal":"Technical results remain, but their operational limits may not travel reliably to decision-makers."},{"slug":"spectral_gap_monitor","disposition":"selected_load_bearing","contribution_type":"SAFETY_GUARDRAIL","adaptation_or_rejection":"Re-estimate separation and mode-shape drift at each bounded envelope increment.","counterfactual_removal":"A fixed basis could silently lose validity as modes approach, rotate, or swap identity."}],"causal_chain":["Define a configuration-specific coupled state and local transition operator.","Extract candidate dynamical modes, gains, damping, and conditioning.","Validate mode shapes against bounded measured responses and reject models with structured residuals.","Identify marginal or weakly damped modes and map candidate changes into their coordinates.","Authorize only small envelope increments whose predicted modal margin and uncertainty satisfy thresholds.","Re-estimate after each increment; halt when margin, gap, drift, or residual gates fail."],"baseline":"Ordinary practice for the scoped comparison is per-channel limit monitoring plus predefined frequency/damping trend checks and expert review at successive envelope points, without a single residual-gated coupled modal decision model. [HYPOTHESIS]","nearest_rival":"Direct time-domain system identification and simulation judged by output prediction and channel thresholds, without interpreting invariant modes. It may handle nonlinear behavior better but offers less explicit attribution of hidden growing directions.","authority_safety":{"affected_parties":["flight-test crew","people beneath or near the test area","aircraft owner and maintenance personnel","future operators and passengers"],"decision_authority":"The designated flight-test authority and airworthiness organization retain sole authority over test-point release; the model is advisory.","authorized_first_step":"Run a shadow analysis on one fixed configuration using archived ground-vibration and low-risk maneuver data. Pre-register damping, residual, drift, gap, and uncertainty thresholds; compare held-out prediction and warning lead time against the baseline. Do not command the aircraft or expand the envelope.","excluded_actions":["autonomous flight-control changes","envelope expansion based solely on the modal model","extrapolation beyond the declared linearization window","suppressing contradictory sensor or crew evidence","in-flight excitation not already approved by the test plan"],"halt_rollback":"Halt model-guided progression on declining margin below threshold, excessive uncertainty, structured residual, spectral-gap collapse, mode-identity drift, sensor disagreement, or crew concern. Revert to the last independently cleared point and require refitting plus authority review."}},"negative_tests":{"strongest_counterevidence":"[HYPOTHESIS] Existing flutter-clearance methods may already identify all safety-relevant modes, while remaining discrepancies are dominated by nonlinear freeplay, saturation, shocks, or configuration transitions that a local modal model cannot improve.","analogy_break":"Unlike an invariant linear operator, the aircraft can be nonlinear, time-varying, non-normal, and configuration-dependent; modes may couple, veer, or disappear outside a small window, so local modal stability is not global flight safety.","failure_condition":"The approach fails if relevant modes cannot be sufficiently excited or observed, the fitted operator is ill-conditioned, no useful validity window exists, or residual and mode-identity uncertainty prevent an actionable margin.","problem_falsifier":"Across representative archived and bounded test points, multichannel coupled indicators provide no earlier or more reliable evidence of unsafe behavior than the best individual-channel and predefined-mode monitors, and no hidden coupled instability is found.","intervention_falsifier":"The preregistered shadow test finds that the modal pipeline does not improve held-out prediction, warning lead time, or decision calibration over the baseline, or repeatedly violates residual, gap, drift, or uncertainty gates.","risks":["False reassurance from locally stable eigenvalues","False alarms from noisy damping or small-gap estimates","Missed unexcited or unobserved modes","Mode swapping mistaken for physical deterioration","Unsafe extrapolation across configuration or amplitude changes","Automation bias in envelope-release decisions","Reduced-order omission of low-energy but safety-critical dynamics"]},"null_rationale":null,"classification":{"candidate_kind":"MECHANISM_COMPOSITION","prior_art_status":"UNSEARCHED","evidence_maturity":"HYPOTHESIS"},"revision_change_log":{"revision_kind":"ORIGINAL","prior_problem_id":null,"prior_causal_lever_id":null,"problem_changed":false,"causal_lever_changed":false,"conceptual_changes":[],"operational_changes":[],"repairs_addressed":[]},"confidence":0.88,"generator_notes":"Closed-book structural fit. The candidate combines analytical decomposition, empirical mode validation, residual testing, and drift/gap gates; aviation-specific prevalence and comparative benefit remain hypotheses."}