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551.
《中国航空学报》2023,36(3):449-470
The digital twin-driven performance model provides an attractive option for the warn gas-path faults of the gas turbines. However, three technical difficulties need to be solved: (1) low modeling precision caused by individual differences between gas turbines, (2) poor solution efficiency due to excessive iterations, and (3) the false alarm and missing alarm brought by the traditional fixed threshold method. This paper proposes a digital twin model-based early warning method for gas-path faults that breaks through the above obstacles from three aspects. Firstly, a novel performance modeling strategy is proposed to make the simulation effect close to the actual gas turbine by fusing the mechanism model and measurement data. Secondly, the idea of controlling the relative accuracy of model parameters is developed. The introduction of an error module to the existing model can greatly shorten the modeling cycle. The third solution focuses on the early warning based on the digital twin model, which self-learns the alarm threshold of the warning feature of gas-path parameters using the kernel density estimation. The proposed method is utilized to analyze actual measured data of LM2500 +, and the results verify that the new-built digital model has higher accuracy and better efficiency. The comparisons show that the proposed method shows evident superiority in early warning of performance faults for gas turbines over other methods. 相似文献
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553.
随着拦截导弹弹体长细比的增加和直接侧向力的作用,拦截导弹上全捷联导引头量测信息严重受到弹体弹性振荡和控制力矩激励的影响,从而造成导弹制导精度的下降。针对现有惯导安装在弹体质心附近的振荡波腹处无法敏感导引头振荡的不足,提出了一种在导引头安装微机电陀螺器件测量振荡角速率,构造差分观测量的新状态模型,通过交互式多模型的容积卡尔曼滤波算法实现对视线角速度的解耦和精确提取。通过构建导弹六自由度制导与控制仿真模型,采用蒙特卡洛打靶仿真验证了算法的有效性。仿真结果表明模型重构后的滤波算法可以将弹体振荡的均方根误差压缩到0.5°以内并有效跟踪弹目视线角速率。 相似文献
554.
LIAO Jinge LI Chengxing ZOU Wenbing KANG Jing SONG Jiangfeng JIANG Bin ZHAO Hu YANG Zhiyuan PAN Fusheng 《上海航天》2022,39(1):92-101
Mg-Gd-Y-Zr alloy castings are widely used in the aerospace field owing to their high strength and excellent creep resistance. The castability of these alloys is also an important consideration for engineering application. Thus, the hot tearing susceptibilities (HTSs) of Mg-10Gd-1Y-1Zn-0.5Zr (VW91) alloy and Mg-10Gd-2Y-1Zn-0.5Zr (VW92) alloy are investigated with a constrained rod casting (CRC) mold. The microstructures and fracture surface are characterized by optical microscope and scanning electron microscope. The results unveil that the HTS of VW92 alloy is lower than that of VW91 alloy. The microstructures indicate that obvious tears can be observed in VW91 alloy, while the tears in VW92 alloy are tiny. The tear feeding and healing by eutectic are also observed in VW91 and VW92 alloys. Therefore, the lower hot tearing susceptibility of VW92 alloy is mainly attributed to the high amount of eutectic which feeds and heals tears. Besides, the effects of the coefficient of thermal expansion (CTE) and the fluidity of VW91 and VW92 alloys on their HTSs are discussed. 相似文献
555.