AIR-RIDE ISOLATION • NATURAL FREQUENCY • BEARING FALSE BRINELLING • 3-AXIS G-FORCE

Supersonic Turbofan Air-Ride Vibration & Dynamic Shock Calculator

Calculate pneumatic suspension isolation resonance, transmissibility ratio, tri-axial dynamic impact G-forces, and bearing brinelling fatigue margins for commercial supersonic propulsion modules.

Engine Cradle & Isolation Parameters

Turbofan Core & Nacelle Dry Mass (kg) 5,200 kg

Air-Spring Isolator Pressure (bar / psi) 4.2 bar (61 psi)

Number of Pneumatic Isolator Bags 4 Isolators

Highway Excitation Peak Frequency (Hz) 12.5 Hz

Peak Road Pothole Impulse Impact (G) 1.8 G Unsprung

Dynamic Shock & Vibration Isolation HUD OPTIMAL ISOLATION

Cradle Natural Frequency (fn)

2.14 Hz

Recommended: ≤ 2.50 Hz

Isolation Transmissibility (T)

0.038 (-28 dB)

96.2% vibration damped

Engine Core Attenuated Shock

0.18 G

OEM limit: ≤ 0.50 G

Bearing Brinelling Margin

3.45x Safety

Roll raceway indentation

Total Cradle Spring Stiffness (k): 940 kN / m

Dynamic Deflection Stroke: ± 28.5 mm

Required Desiccant Bags (MIL-D-3464): 32 Units (Active Silicagel)

Desiccant Protection Hold Time: 21 Days (< 25% RH)

Configure Engine Telemetry in Exspeedite TMS

01 / ROTATING HARDWARE

False Brinelling Prevention

When stationary turbofan rotor shafts experience sustained micro-vibrations without rotating, lubricating oil film is squeezed out from between ceramic ball/roller bearings and steel raceways. Direct metal-to-metal contact causes micro-fretting wear (false brinelling), leading to catastrophic bearing failure upon turbine startup.

02 / AIR-SPRING DYNAMICS

Resonance Decoupling

Highway trailer hop occurs at 2.8 to 4.5 Hz, while truck unsprung axle vibration occurs at 10 to 14 Hz. The engine shipping cradle's pneumatic suspension must be tuned to a natural frequency strictly below 2.2 Hz to prevent resonant amplification of road shock pulses.

03 / DESICCATION

Turbine Blade Corrosion

Single-crystal nickel superalloy high-pressure turbine blades and thermal barrier coatings (TBC) suffer corrosion pitting if humidity exceeds 40% RH. Moisture is controlled via sealed vapor barrier barrier bags and MIL-D-3464 Type II clay desiccant packs tracked via wireless humidity indicators.

Download Supersonic Propulsion Transport Engineering Package

Access complete pneumatic cradle spring curve tables, shock recorder calibration protocols, and OEM turbine transit warranties.