Strength of materials
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Strength analysis of special pneumatic deformable shell model, intended for antenna deployment under the action of severe storm.

Aerodynamic analysis of structure blowing and strength analysis based on resultant forces.

The structure represents rigid metallic frame consisting of axis and eight radial mounts. The hollow pneumatic shell loaded with inner pressure is located around the axis.

Two types of analysis were made.

Aerodynamic analysis. Structure blowing by wind flow in order to define the pressure applied to deformable shell.

Analysis of shell stress-strain behavior caused by the force values received in aerodynamic analysis.

To perform the analysis the structure of pneumatic shell and radial mounts was simulated (fig. 1). Besides, the air space 5 meters around the structure was taken into account for simulating the air flow behavior.

The purpose of analysis was to define maximum shell deformation caused by wind speed 25 m/s.

Aerodynamic analysis.

To receive the pressure distribution by shell blowing with wind flow, the aerodynamic analysis was conducted. The analysis used the exact shell model; and simplified model of metal structures (fig. 2). Besides, the air space 5 meters around the structure was taken into consideration for the correct simulation of air flows.

The wind acts on the structure at 450 to shell axis. Wind speed is taken as 25 m/s (severe storm).

The analysis result was the pressure distribution over the surface of pneumatic shell (fig. 7,8). This pressure was used as a load value for strength calculation.

Aerodynamic calculation results

The calculation results were the wind loads acting on deformable shell structure in case of the wind speed 25 m/s. Wind pressure on shell: from -800 Pa to 388 Pa. The wind acts with joint force 91,2 kg.

These loads were applied to pre-inflated shell, and the deformed condition was analyzed.

Maximum stress in the mounts was 6,6 MPa which is the sign of high strength reserve.

Maximum shell displacement after inner pressure application: 1,55 mm.

After the wind loads were applied, the maximum displacement increased up to 1,66 mm.

Shell displacement never exceeded 2 mm.
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