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| Degradation Modeling and Performance Evolution Prediction of Stage Separation Systems with Spring Stress Relaxation Effects |
| Received:March 26, 2025 Revised:April 30, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.05.001 |
| KeyWord:stage separation stress relaxation performance degradation multi-body dynamics accelerated testing |
| Author | Institution |
| LI Ang |
Beijing Institute of Electronic System Engineering, Beijing , China |
| WU Yanzeng |
Beijing Institute of Electronic System Engineering, Beijing , China |
| BAI Xue |
Beijing Institute of Electronic System Engineering, Beijing , China |
| PANG Huan |
School of Automobile, Chang'an University, Xi'an , China |
| SUN Zhongchao |
School of Aeronautics, Northwestern Polytechnical University, Xi'an , China |
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| Abstract: |
| The work aims to predict the stress relaxation of spacecraft springs under long-term storage and the resulting evolution of separation system performance. Spring accelerated degradation testing and multi-body dynamics methods were integrated to predict the evolution of separation performance. Through temperature-accelerated testing, a stress relaxation constitutive model for the spring was established, and the nonlinear decay law of spring force under multiple temperature profiles was predicted. A multi-body dynamics model of the separation system was constructed, and the spring relaxation effect was incorporated to develop a separation system performance evolution model. The spring exhibited a high stress relaxation rate of 5.6% within the first 2 years of storage. After 20 years of storage, the spring force loss was approximately 6%. With increasing storage time, the spring stress relaxation effect caused a decline in separation performance, leading to a 2.1% reduction in separation velocity and 3.1% reduction in separation distance at the expiry of storage life. Under parameter dispersion, the maximum separation angle was 0.408°, which was below the attitude threshold. In conclusion, springs exhibit significant stress relaxation effects during storage, increasing the risk of separation failure. Stress relaxation effects have effects on velocity, distance and attitude of separation, which should be considered in the initial stage of design. |
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