Introduction:
This Container is a carrier of complex electronic equipments used for Military purposes and also houses an integrated generator assembly for an autonomous power source. The base frame of the container is designed to withstand harsh environmental conditions, road vibrations, wind load, snow load and also has to have lifting and transportation capabilities.
Following Analyses were performed to investigate load bearing capacity of Container –
Lifting Analysis was performed for the critical scenario of lifting the structure with payloads utilizing lifting diagonally opposite lugs to determine the effect of it on the frame and the payloads.
Wind Loading Analyses was coupled analyses, performed in ±X, Y, Z directions with the input from the results of CFD with reference to the wind data sheet. This is the worst case environmental condition performed to check Side walls and structural frame stresses and deformation to Wind load.
Snow Loading Analyses was performed with the snow load data and performed in all 3 axes. This was performed to determine the possibility of buckling of columns due to Snow load and FOS.
Modal Analysis was performed to determine the natural frequency of the integrated structure self-excited with its self-weight and to find the possibility of resonance with the vibration of generator assy.
Harmonic vibration analyses were preformed along ±(X, Y, and Z) axes as par MIL standards to determine the behavioural response to the forced vibration.
Shock analyses were performed with half sine curve to get the effect of sudden impact loading over the frame.
Approach towards Analysis:
- Preparation of Finite Element Model abiding quality criteria by averting Warpage, Jacobian skewness issues etc.
- Applying Specific material Properties and payloads for the Structure with point masses.
- For modal analyses, the payload and gravity are applied and for other analyses the respective load and conditions are taken into account.
| Components | Bolt forces ( KN ) | Bolt forces ( KN ) | Bolt forces ( KN ) |
| X | Y | Z | |
| Lifting lugs | 3.432 | 0.6755 | 0.2239 |
| Duct to frame | 0.876 | 2.935 | 7.40 |
| Plc to mounts | 0.263 | 3.872 | 1.203 |
| Lv panel to mounts | 5.644 | -92.384 | -2.829 |
| Mount Pads | -29.134 | -6.932 | -7.034 |
| Components | Weld force ( KN ) | Weld force ( KN ) | Weld force ( KN ) |
| X | Y | Z | |
| Beam to channel one side | 3.01 | 7.48 | 57.34 |
| Channel to beam both side | -15.78 | -28.39 | -198.56 |
| Channel to channel both | 19.56 | -73.01 | -301.04 |
| Beam to beam one sides | 8.01 | 98.62 | 349.75 |
| Beam to beam both sides | 73.34 | -216.9 | -216.73 |
Bottom Line
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