Launch Pad No.2 Structural Health Monitoring at Jiuquan
Project name: Jiuquan Satellite Launch Center - Launch Pad No.2 Structural Health Monitoring System
The world-class launch facility has implemented an advanced structural health monitoring (SHM) system utilizing DE-944 dynamic signal testing equipment combined with multi-parameter sensors to ensure operational safety for critical space missions including crewed Shenzhou launches.
1. Monitoring System Configuration
| Component | Specification | Deployment |
|---|---|---|
| DE-944 Mainframe | 128-channel, 24-bit @ 128kHz | Central control cabin |
| DT1A314E Triaxial Accelerometer | ±10g range, 0.1-2000Hz | 36 units on tower structure |
| High-Temperature Strain Gauge | 120Ω, -200°C~300°C | Flame trench & load-bearing columns |
| Acoustic Emission Sensors | 50kHz-1MHz bandwidth | Near cryogenic pipe joints |
| Wireless Temperature Nodes | PT100, ±0.5°C accuracy | Hydraulic system mounts |
2. Key Monitoring Parameters
Structural Dynamics:
Natural frequency shift tracking (±0.01Hz sensitivity)
Damping ratio evolution post-launch
Vibration transmission path analysis
Environmental Effects:
Thermal gradient-induced stress (ΔT up to 250°C)
Acoustic overpressure mapping (160dB+ measurement)
Cryogenic pipeline vibration (LOX/LH2 flow induced)
3. Real-Time Diagnostic Features
Anomaly Detection:
Auto-triggered alerts when vibration exceeds 5σ thresholds
Machine learning-based crackle detection in weldments
Load History Reconstruction:
Cumulative damage calculation per launch
Remaining life prediction for critical joints
4. Engineering Value Delivered
Mission Assurance:
Prevented potential failure during Shenzhou-15 launch by detecting 0.15mm bolt loosening
Identified and rectified resonant frequency drift after 12th reuse
Maintenance Optimization:
Reduced inspection downtime by 60% through targeted diagnostics
Extended service life by 3-5 cycles via strain-based retirement criteria
System Highlights:
Survives 7.2g transient vibration during lift-off
90-day continuous operation capability in Gobi Desert conditions (-30°C~50°C)
Integrated with launch control system for automatic hold decision-making
