Shape Adjustment and Experimental Study of a Shape Memory Cable (SMC) Structure.

Area of Science:

• Space engineering
• Materials science
• Mechanical engineering

Background:

• Large deployable cable net antennas are crucial for space applications due to their structural efficiency.
• Harsh space environments cause thermal deformation and stress relaxation, degrading antenna performance.
• Existing cable net structures face challenges in maintaining surface accuracy.

Purpose of the Study:

• To investigate the use of shape memory cables (SMCs) to mitigate thermal deformation in cable net structures.
• To enhance the surface accuracy of deployable antennas using SMCs' phase transition properties.
• To validate the effectiveness of SMCs in improving antenna performance under varying temperatures.

Main Methods:

• A 2.2 m diameter shape memory cable net structure model was constructed.
• Experiments were conducted at normal, high, and low temperatures to simulate space conditions.
• Surface accuracy adjustments were evaluated under thermal cycling.

Main Results:

• Shape memory alloy wire demonstrated stable surface accuracy adjustment capabilities at room temperature.
• The SMC net structure exhibited minimal thermal deformation and good surface accuracy during temperature cycling.
• Surface accuracy improved by 44.4% at high temperatures and 45.2% at low temperatures compared to ordinary structures.

Conclusions:

• The proposed method effectively utilizes SMCs to adjust and improve the surface accuracy of cable net structures.
• SMCs offer a viable solution for enhancing the performance and reliability of deployable antennas in space.
• Experimental findings provide significant guidance for future engineering applications of SMCs in space technology.