Intrinsic Mode Analysis of Space Hinge Rod Deployment Mechanism_Hinge Knowledge_Tallsen

Abstract: The natural frequencies of the space hinge rod expansion mechanism are influenced by the materials and reinforcement methods used. This study conducted modal analysis using the finite element software ANSYS to investigate the influence of material density and reinforcement method on the natural frequency. The results showed that the density of the material used has a significant impact on the natural frequency, with greater impact at higher densities. Additionally, different reinforcement methods also resulted in significant differences in natural frequency. The findings of this study provide guidance for the dynamic analysis and optimization of the space hinge rod deployment mechanism.

1.

The rapid development of the space industry has increased the demand for large-scale space deployment mechanisms. These mechanisms are used for various applications such as flexible solar cell arrays, antennas, and support structures for remote sensing and deep space probes. The deployment mechanisms need to be folded and stored during the launch phase and then expanded using a power source once in space. However, as the size of the support structure increases and the mass decreases, the rigidity of the structure decreases, leading to lower natural frequencies. This can cause coupling vibrations between the spacecraft body and the deployment mechanism, reducing the stability of the mechanism. Therefore, it is important to study the influence of material density and reinforcement method on the natural frequency of the space hinge rod deployment mechanism.

2. Model of the space hinge rod deployment mechanism

The space hinge rod deployment mechanism consists of a frame part and a rod part. The frame and rods are connected using hinge shafts, forming a scissor support structure. The reinforcement methods considered in this study are connecting rod reinforcement and steel wire rope reinforcement. The connecting rod reinforcement involves connecting two U-shaped rods in the same direction, while the steel wire rope reinforcement involves winding a steel wire rope around a roller. The finite element model of the mechanism was created using Solid45 units for the frame and rod parts and BEAM188 units for the reinforcement parts.

3. Modal analysis

Modal analysis was conducted to determine the vibration characteristics and fundamental frequencies of the structure. Two materials, aluminum and carbon fiber, were considered, and the reinforcement methods of connecting rods and steel wire ropes were compared. The results showed that the mechanism made of carbon fiber with connecting rod reinforcement had the highest fundamental frequency, while the mechanism made of aluminum with steel wire rope reinforcement had the lowest fundamental frequency. The mechanism made of carbon fiber with connecting rod reinforcement had a fundamental frequency 71.7% greater than that of steel wire rope reinforcement. Similarly, the mechanism made of aluminum with connecting rod reinforcement had a fundamental frequency 58% greater than that of steel wire rope reinforcement. In terms of material density, carbon fiber had a higher fundamental frequency than aluminum, with a difference of 48.5% for connecting rod reinforcement and 23.5% for steel wire rope reinforcement.

4.

The natural frequencies of the space hinge rod deployment mechanism are influenced by the materials and reinforcement methods used. The density of the material has a significant impact on the natural frequency, with higher densities resulting in lower natural frequencies. Different reinforcement methods also lead to significant differences in natural frequency. When selecting reinforcement methods and materials for the space hinge rod deployment mechanism, it is important to consider the factors that affect the natural frequency. These findings provide guidance for the design, analysis, and optimization of the mechanism.

In conclusion, the study of the influence of material density and reinforcement method on the natural frequency of the space hinge rod deployment mechanism is crucial for ensuring the stability and performance of the mechanism. With the advancements in technology, further improvements and optimizations can be made to enhance the dynamics and overall efficiency of space hinge rod deployment mechanisms.