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从1980年起,美国空军一直在研究把两级火箭发动机结合在一起的整体级方案(ISC).这种方案可提高多级导弹系统的性能,共用某些导弹结构部件,有效地利用推进系统的可用容积,使发动机可靠性更高,制造成本显著降低.航空喷气战略推进公司(ASPC)一直在研究整体级方案应用于未来的先进洲际弹道导弹(AICBM)、空中发射助推滑翔飞行器(BGV)、快速燃烧助推器和轨道运送飞行器(OTV).这些系统采用和以前不同的部件设计方案和材料,取得了一些研究成果.根据最近完成的详细研究表明,对于体积有限系统,级性能改善30%左右,对于重量有限系统,级性能改善15%.
The U.S. Air Force has been studying an integrated level program (ISC) that combines a two-stage rocket motor since 1980. This solution can improve the performance of a multi-stage missile system, share certain missile structural components and make effective use of propulsion systems (ASPV) has been studying the application of a holistic approach to the future of the Advanced Intercontinental Ballistic Missile (AICBM), the Airborne Launch Glide Vehicle (BGV ), Quick Combustion Boosters and Orbital Vehicles (OTV), which have achieved some research results using previously different component designs and materials.According to a detailed study recently completed, it is shown that for a limited volume system performance improvement About 30%, for a limited weight system, level performance improvement of 15%.