Integrated Multi-Sensor Intelligent RCC Condition Assessment Device
Based on Elastic-Wave Propagation, Dynamic Response and Acoustic-Emission-Compatible Monitoring
Four-Channel Accelerometer Structural Health Monitoring Prototype
1. System Configuration
2. Four-Channel Sensor Arrangement
A0
Reference / Input
Excitation-reference accelerometer
Excitation-reference accelerometer
A1
Response Sensor 1
Structural response
Structural response
A2
Response Sensor 2
Structural response
Structural response
A3
Response Sensor 3
Structural response
Structural response
H₁(f) = Gyx(f) / Gxx(f)
γ²(f) = |Gxy(f)|² / [Gxx(f)Gyy(f)]
γ²(f) = |Gxy(f)|² / [Gxx(f)Gyy(f)]
3. Experimental Data Input
Upload CSV data using either:
Time,A0,A1,A2,A3
or
A0,A1,A2,A3
or
A0,A1,A2,A3
Waiting for experimental data...
4. Healthy Baseline Management
No baseline loaded.
5. Signal Processing
Step 1 → Detrending
Step 2 → Windowing
Step 3 → FFT
Step 4 → PSD
Step 5 → Cross PSD
Step 6 → H₁ FRF
Step 7 → Coherence
Step 8 → Damage-sensitive feature extraction
Step 9 → Condition index
Step 2 → Windowing
Step 3 → FFT
Step 4 → PSD
Step 5 → Cross PSD
Step 6 → H₁ FRF
Step 7 → Coherence
Step 8 → Damage-sensitive feature extraction
Step 9 → Condition index
6. Time-Domain Acceleration
7. Power Spectral Density
8. H₁ Frequency Response Function
9. Magnitude-Squared Coherence
10. Extracted Condition Assessment Features
| Sensor | RMS | Peak | Dominant Frequency (Hz) | FRF Peak | Average Coherence |
|---|---|---|---|---|---|
| No analysis available. | |||||
11. Damage-Sensitive Indicators
| Sensor | Frequency Shift (%) | FRF Deviation (%) | Coherence Loss (%) | Damage Index |
|---|---|---|---|---|
| Baseline comparison required. | ||||
12. Intelligent RCC Condition Index
--
Awaiting assessment
Run the complete assessment to calculate the condition index.
13. Research Data Export
14. Research Notes and Interpretation
- A0 is treated as the reference/excitation channel.
- A1, A2 and A3 are structural response channels.
- A classical FRF requires a physically meaningful excitation/reference measurement. For rigorous force-based FRF testing, an instrumented impact hammer or force transducer is preferable.
- Frequency reduction, FRF changes and coherence degradation may indicate changes in structural dynamic characteristics.
- The condition index implemented here is a research prototype and must be calibrated against experimental damage states.
- The thresholds used in this prototype are not structural safety limits and must not be used directly for RCC design or public safety decisions.
- Accelerometers alone do not constitute a conventional high-frequency acoustic-emission system. Dedicated piezoelectric AE sensors and appropriate high-speed acquisition are required for true AE monitoring.
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