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Aimed at the problem of store separation from internal cavity, this paper innovatively puts forward a separation scheme of using lateral jet to assist store safe separation. The jet ensures that the store is continuously subjected to down head moment during separation, so as to ensure safe separation. The wind tunnel free drop test technique with lateral jet is established, which can ensure that there is no support interference in the motion process of the store and more truly simulate the motio... 相似文献
515.
《中国航空学报》2023,36(5):157-174
The Secondary Air System (SAS) plays an important role in the safe operation and performance of aeroengines. The traditional 1D-3D coupling method loses information when used for secondary air systems, which affects the calculation accuracy. In this paper, a Cross-dimensional Data Transmission method (CDT) from 3D to 1D is proposed by introducing flow field uniformity into the data transmission. First, a uniformity index was established to quantify the flow field parameter distribution characteristics, and a uniformity index prediction model based on the locally weighted regression method (Lowess) was established to quickly obtain the flow field information. Then, an information selection criterion in 3D to 1D data transmission was established based on the Spearman rank correlation coefficient between the uniformity index and the accuracy of coupling calculation, and the calculation method was automatically determined according to the established criterion. Finally, a modified function was obtained by fitting the ratio of the 3D mass-average parameters to the analytical solution, which are then used to modify the selected parameters at the 1D-3D interface. Taking a typical disk cavity air system as an example, the results show that the calculation accuracy of the CDT method is greatly improved by a relative 53.88% compared with the traditional 1D-3D coupling method. Furthermore, the CDT method achieves a speedup of 2 to 3 orders of magnitude compared to the 3D calculation. 相似文献
516.
为了满足某卫星大部件二维转台在地面重力状态装配后,保证其在轨解锁前精度一致性,提出了二维转台装配工艺优化方法。首先通过模拟载荷配重试验,探索转台星上接口重力下变化规律,保证结构板组合加工偏差,优化卫星层板组合加工工艺方法;其次分析二维转台机构变形,采用卸载装星工装,并对二维转台卸载装配前后关键变形进行精测对比。二维转台通过模拟试验和卸载装配后,保证了地面重力压紧状态和卸载状态下装配精度均在设计指标内,满足卫星二维转台装配要求。通过模拟试验确定结构加工公差余量,在进行卸载装配时,对卸载前后精度精测对比,是卫星大部件载荷装配工艺的正确方法。 相似文献