卫星单元肼推进系统延寿能力分析

Analysis on lifetime extension capability of monopropellant hydrazine propulsion system for satellites

为适应当前卫星长寿命高可靠技术发展趋势要求,通过对制约单元肼推进系统产品设计寿命的各项薄弱环节进行梳理,主要从产品的任务完成能力、环境条件适应性以及各工作模式下的功能性能保证等方面开展延寿能力分析,同时结合在轨卫星的实际运行健康状态评估结果,得出基于当前设计和工艺水平下推进系统可达到的10年在轨寿命能力。在此基础上,给出进一步提升延寿能力的研究验证建议,主要从提高单元推力器比冲、提高推进剂剩余量测算精度、开展非金属密封件长期承压条件下的密封可靠性试验、开展压力传感器的抗辐照加固设计优化、开展全寿命期间的系统性能定量评估试验等方面开展研究和试验工作。

In order to meet the requirement of the development trend of long-life span and high reliability for modern satellites, each weak link which limits the design life of monopropellant hydrazine propulsion system is analyzed. The analysis of prolonging the product＇s life span in the aspects of the products＇ ability of mission fulfillment, environmental adaptability and function performance guarantee under various operating patterns is carried out. The ability of 10 years on-orbit life span of the propulsion systems based on the current design and fabrication level was obtained in combination with the assessment result of healthy status in the actual on-orbit running of satellites.Based on the result of analysis, the advises for research and verification of further enhancing the life extension are given, which should be carried out in the aspects of increasing the specific impulse of monopropellant hydrazine system, improving the measurement accuracy of residue propellant,performing the sealing reliability experiment of nonmetal seals under the condition of long-termcompression, optimizing the reinforcing design of pressure sensor for radiation resistance, and developing the assessment test of system properties in the whole life cycle, for prolonging the life span should be performed.