EMI-AEROSPACE SHM TECHNOLOGY VISUALIZATION SIMULATOR

Part 1 — Structure & Flexible PZT Transducers

Target Aerospace Component

Structure Length ($L$) 10.0 m

Number of PZT Transducers ($N_{\text{pzt}}$)

Active PZT Actuator / Drive Transducer

PZT 1 Start Offset ($x_1$) 0.5 m

PZT Inter-Spacing ($d$) [Min: 0.3m] 1.8 m

Part 2 — Experiment Execution & Sweep Time

Experiment Execution Time

Max Sweep Frequency ($f_{\text{max}}$)

Y-Axis Max Conductance ($G_{\text{max}}$)

Part 3 — Damage & Severity

Surface Defect / Crack State

Damage Severity Level 0% (None)

Part 4 — 3D Structural Context & Layout

● SYSTEM READY

✈️ 3D MODEL: WING BOX MAIN SPAR

PZT ARRAY LAYOUT (SPAN: 10.0m)

Part 5 — Bounded EMI Spectrum: Conductance ($G$) & Susceptance ($B$)

ELECTROMECHANICAL ADMITTANCE SIGNATURE

⏳ SWEEPING: 00:00

Conductance G(f)

Susceptance B(f) [Anti-Resonances]

Active Drive Transducer

Part 6 — EMI Signal Metrics

Peak Conductance (G) 0.00 mS

Susceptance Peak (B) 0.00 mS

RMSD Index 0.00 %

MAPE Metric 0.00 %

Part 7 — ARJUN AI Diagnosis

Awaiting EMI frequency sweep run. Select execution time and click Start.

Live Experiment Log

[00:00] EMI Aerospace SHM Simulator Initialized.
[00:00] Real-time timed execution mode active.
[00:00] Cumulative admittance B(ω) array model ready.

📖 EMI Aerospace SHM Educational & Conceptual Lab Guide

1. Intelligent Pedagogical Concept: PZT Array Multiplexing

In structural health monitoring of aircraft structures, multiple Piezoelectric Lead Zirconate Titanate (PZT) patches are attached across critical spars, frames, and skins. This simulator conceptualizes PZT Multiplexing, where an array of transducers is monitored through a single impedance analyzer channel using switching logic.

2. Cumulative Admittance Formulation

The electrical admittance $Y(\omega) = G(\omega) + j B(\omega)$ measured at any active actuator represents the cumulative electro-mechanical coupling of the entire structure and nearby bonded PZT sensors.

📚 Academic Reference for Conceptual Study:
"The electromechanical admittance measured across multiplexed PZT networks reflects the cumulative coupled dynamic interaction between individual piezo-actuators and the host structural modes."
— Annamdas, V. G. M., & Soh, C. K. (2007). "Electromechanical Impedance Modeling and PZT Multiplexing in Structural Health Monitoring". Refer to literature for full analytical derivation.

3. Baseline vs. Damage Signatures: Peak Shifts & RMSD Dynamics

Students should closely observe how damage influences electromechanical signatures:

Frequency Shift (Mode Shift): Structural stiffness reduction (e.g., crack propagation or fastener loosening) causes high-frequency resonant peaks in $G(\omega)$ and $B(\omega)$ to shift downward (leftward).

Peak Damping & Amplitude Alteration: Local structural damping reduces peak amplitudes or creates new micro-resonance peaks.

Root Mean Square Deviation (RMSD) Metric: RMSD quantifies signature deviation from healthy baseline: $$\text{RMSD} = \sqrt{\frac{\sum_{i=1}^{N} \left( G_i^d - G_i^h \right)^2}{\sum_{i=1}^{N} \left( G_i^h \right)^2}} \times 100\%$$

⚠️ Important Signal Interpretation Note for Students:
A higher RMSD value generally indicates significant structural alteration, but RMSD does NOT always increase monotonically with severity. At high damage levels or specific anti-resonance regions, signature cancellations can occur. RMSD study must always be tied together with frequency-shift and modal analysis to correctly diagnose damage severity.

4. Download Dataset Filename Convention

When exported to CSV, dataset filenames include full experimental parameters:

EMI_Spectrum_[Structure]_TotalPZT[N]_ActivePZT[M]_[Severity]Pct_[Time]min.csv

5. Conceptual Visualization Disclaimer

While 3D aircraft models demonstrate transducer placement and structural interaction, actual physical installation involves complex wiring and bonding agents. All admittance signatures are generated strictly for conceptual and educational instruction.