Literature positioning & related-work verification for 3-controller regime journal article

[salhus]

Purpose

Track the literature-review / related-work verification needed before submitting the journal article on the 3-controller regime study (CC → opt_passive → ff+PID) for the VGOSWEC variable-geometry flap.

Revisit once the simulation phase is finalized (all 5 flaps × 3 controllers swept, cleanup PR merged, regime crossovers locked).

Context

Planning a journal article. Current controller ladder / regime relay:

• CC (complex-conjugate / reactive) — wins short periods (off-resonance, large reactance to cancel).
• opt_passive (optimal resistive damping, B_opt = |Z_intrinsic(ω₀)|) — near-optimal in the resonance band (reactance ≈ 0).
• ff+PID (excitation-feedforward velocity-tracking + PID + passive-safety guard) — wins long periods.
• Flap vent angle slides each flap's resonance (T₀ from 2.99 s @ VGM-90 → 5.86 s @ VGM-0), giving a 2-D operating map over (wave period × flap-angle × controller).

Open questions to answer against the literature

1. Individual controller performance in line with literature?

   • CC: expected to track Budal/optimal bound (Falnes) — confirm our η≈94–108% short-T validation is the standard result. Confirm reactive-power burden off-resonance (|inj|/conv → ~0.9) matches the well-known CC impracticality motivation.
   • opt_passive: confirm B_opt = |Z(ω₀)| and its coincidence with CC at resonance is the textbook resistive-loading result.

2. Has the ff+PID controller been characterized before?

   • Position against excitation-feedforward / velocity-reference tracking WEC control (Fusco & Ringwood line of work).
   • Position the passive-safety guard against passivity-based / energy-guarded WEC control literature.
   • Assess reviewer exposure on the known limitation: F_exc is the raw un-hinge-referred pitch moment, with alpha absorbing the phase/sign mismatch (see docs/CONTROLLERS.md §Known limitations). Decide: fix hinge-referencing or pre-empt in limitations.

3. Is the 3-controller regime relay novel?

   • The regime ordering is physically expected (not surprising to experts) — frame as systematic simulated quantification, not discovery.
   • Likely real novelty = the controller × geometry regime map for the variable-geometry OSWEC (VGOSWEC). Verify whether prior variable-/adaptive-geometry OSWEC control studies exist.

Anchor references (already cited in repo)

• Falnes, J. (2002). Ocean Waves and Oscillating Systems. Cambridge UP.
• Ringwood, J. V. et al. (2014). Energy-maximizing control of WECs. IEEE TCST 22(4), 1345–1353.
• Faedo, N. et al. (2017). Optimal control, MPC and MPC-like algorithms for wave energy systems. IFAC J. Systems and Control, 1, 37–56.
• Ogden et al., ASME JOMAE 145(3):030905 (VGOSWEC device / Table 1 source).

Action items

• Run a deep-research / web-enabled lit search to verify the above (no external search available in the issue-drafting session).
• Confirm citations for CC and optimal-resistive results.
• Locate closest prior art for excitation-feedforward velocity-tracking + passivity-guarded control (position ff+PID).
• Search for prior variable-geometry OSWEC controller studies (nail down co-design novelty).
• Draft the related-work section framing contributions honestly: validated known controllers + one engineered practical scheme + novel controller×geometry regime map.
• Decide on hinge-referencing fix for ff+PID vs documenting as a limitation.

Note

Framing guidance was generated from model training knowledge, NOT a live literature search — every citation and novelty claim MUST be independently verified before manuscript submission.