Transactions of Nanjing University of Aeronautics & Astronautics

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  • 1  Analysis and Control of Surface Delamination Defects During Milling of Orthogonal Aramid Fiber-Reinforced Composites Laminates
    SHI Zhenyu DUAN Ningmin LI Xin WANG Zhaohui
    2020, 37(3):353-359. DOI: 10.16356/j.1005-1120.2020.03.001
    [Abstract](266786) [HTML](1424) [PDF 2.06 M](336899)
    Abstract:
    The aramid fiber-reinforced composites (AFRC) can increase the durability of corresponding applications such as aerospace, automobile and other large structural parts, due to the improvement in hardness, heat build-up, wear properties and green environmental protection. However, because of its complex multiphase structure and unique heterogeneity and anisotropy, the poor compression fatigue resistance and the incident surface fibrillation are inevitable. To improve the assembly precision of AFRC, mechanical processing is necessary to meet the dimensional accuracy. This paper focuses on the influence of contour milling parameters on delamination defects during milling of AFRC laminates. A series of milling experiments are conducted and two different kinds of delamination defects including tearing delamination and uncut-off delamination are investigated. A computing method and model based on brittle fracture for the two different types of delamination are established. The results can be used for explaining the mechanism and regularity of delamination defects. The control strategy of delamination defects and evaluation method of finished surface integrity are further discussed. The results are meaningful to optimize cutting parameters, and provide a clear understanding of surface defects control.
    2  Lattice Boltzmann Flux Solver: An Efficient Approach for Numerical Simulation of Fluid Flows
    Shu Chang Wang Y Yang L M Wu J
    2014, 31(1):1-15.
    [Abstract](2558) [HTML](0) [PDF 4.92 M](2641)
    Abstract:
    A lattice Boltzmann flux solver (LBFS) is presented for simulation of fluid flows. Like the conventional computational fluid dynamics (CFD) solvers, the new solver also applies the finite volume method to discretize the governing differential equations, but the numerical flux at the cell interface is not evaluated by the smooth function approximation or Riemann solvers. Instead, it is evaluated from local solution of lattice Boltzmann equation (LBE) at cell interface. Two versions of LBFS are presented in this paper. One is to locally apply one dimensional compressible lattice Boltzmann (LB) model along the normal direction to the cell interface for simulation of compressible inviscid flows with shock waves. The other is to locally apply multi dimensional LB model at cell interface for simulation of incompressible viscous and inviscid flows. The present solver removes the drawbacks of conventional lattice Boltzmann method (LBM) such as limitation to uniform mesh, tie-up of mesh spacing and time interval, limitation to viscous flows. Numerical examples show that the present solver can be well applied to simulate fluid flows with non-uniform mesh and curved boundary.
    3  结合遗传算法和优化Q-Law算法的小推力轨道转移
    程月华 姜斌 孙俊 张娴 侯倩
    2010(4).
    [Abstract](2427) [HTML](0) [PDF 0.00 Byte](196)
    Abstract:
    A new orbit transfer method is presented by combining the genetic algorit h m (GA) with the refined Qlaw method. Considering the energy consumptio n , the relative thrust efficiency is introduced as a threshold deciding whether t o thrust or coast. GA is used to achieve the global timeoptimal orbit trans f er. The trajectory optimization problem is transformed into the constraint para met er optimization problem, thus the nonlinear twopoint boundary value problem is avoided. The refined Qlaw method integrated with the fuzzy logic control is adopte d for t he end course, the vibration is avoided and the high precision is achieved. The numerical simulation of satellite orbit transfer is implemented. Result s show that the new method can achieve the timeoptimal orbit transfer and t he low energy consumption, thus improving the transfer precision.
    4  纳米二氧化钛吸入对小鼠肺部和血清生化指标的影响
    何聘婷 陶杰 张焱焱 汤育欣 王月勤
    2010(4).
    [Abstract](2239) [HTML](0) [PDF 0.00 Byte](208)
    Abstract:
    The effect of inhaled nanoTiO2 on lung histology and serum biochemic al indexes is evaluated in healthy and adult Kunming mice (eight in each group) after exposure to TiO2 aerosols (1 500 mg/m3) in a sealed chamber. Ano ther e ight mice are exposed to indoor air to be served as a control group. Lung tissue and blood are collected after euthanizing the animals. The results show that la c tate dehydrogenase (LDH) activity increases in all experimental groups. Alanine aminotransferase(ALT) activity and blood urea nitrogen (BUN) levels are increase d in the group exposed to TiO2 aerosols for 28 d, and creatinine(Cr) level s are increased in 14 d and 28 d samples (P<005). No obvious changes are observed in other serum indexes. Lungs of mice exposed to 28 d exposure show significant but moderate increase in pulmonary inflammatio n, and many TiO2 particles are found in the interstitium of pulmonary alve oli.
    5  机身整体壁板在轴压载荷下后屈曲计算及结构优化
    孙为民 郭亮 童明波 董登科
    2010(4).
    [Abstract](2202) [HTML](0) [PDF 0.00 Byte](209)
    Abstract:
    Buildup panels for the commercial aircraft fuselage subjected to the axial com pression load are studied by both experimental and theoretical methods. An integ ral panel is designed with the same overall size and weight as the buildup str ucture, and finite element models (FEMs) of these two panels are established. Ex perimental results of buildup panels agree well with the FEM results with the nonliearity and the large deformation, so FEMs are validated. FEM calculation results of these two panels indicate that the failure mode of the i ntegral panel is different from that of the buildup panel, and the failure loa d increases by 184% up to postbuckling. Furthermore, the integral structure is optimized by using the multiisland genetic algorithm and the sequential quadratic progr amming. Compared with the initial design, the optimal weight is reduced by 87 % and the strength is unchanged.
    6  航班进场调度的改进捕食搜索算法
    姜雨 杨英宝 周航
    2010(4).
    [Abstract](2165) [HTML](0) [PDF 0.00 Byte](196)
    Abstract:
    To solve aircraft arrival sequencing and scheduling problems, and imp rove the typical predatory search algorithm(PSA), an innovative PSA is developed . The new PSA uses variable constraints of local search and global search to avo id falling into local optimal solutions and the degeneration of solutions. To te st t he performance of new PSA, a case study with ten arriving flights and two runway s is performed. Test results show that the new PSA performs much better than typ ical PSA and genetic algorithm(GA) in the aspects of the rate of gaining optimal solutions and the computational time.
    7  多输入多输出雷达的非均匀线性阵列配置
    penzhenni
    2011, 28(2):152-156.
    [Abstract](2104) [HTML](0) [PDF 180.16 K](2364)
    Abstract:
    8  片上网络体系结构仿真和性能分析
    葛芬 吴宁
    2010(4).
    [Abstract](2101) [HTML](0) [PDF 0.00 Byte](214)
    Abstract:
    The network on chip (NoC) is used as a solution for the communication p roblems in a complex system on chip (SoC) design. To further enhance performance s, the NoC architectures, a high level modeling and an evaluat ion method based on OPNET are proposed to analyze their performances on differ ent injectio n rates and traffic patterns. Simulation results for general NoC in terms of the average latency and the throughput are analyzed and used as a guideline to make appropriate choices for a given application. Finally, a MPEG4 decoder is mapped on different NoC architectures. Results prove the effectiveness of the evalua tion method.
    9  固态染料敏化太阳能电池用聚苯胺-乙炔黑空穴导体的制备
    秦琪 陶杰 杨艳 包祖国
    2010(4).
    [Abstract](1878) [HTML](0) [PDF 0.00 Byte](197)
    Abstract:
    A claylike conductive material comprising polyaniline (PANI)acetylen e black particles is fabricated as a hole conductor for dye sensitiz ed solar cell (DSSC). The results show that the introduction of acetylene black into the polymer electrolyte improves the photovoltaic behavior of solidstate DSSC, owing to the increase of the hole mobility of PANI electroly t e, the improvement of the wetting quality of the composite electrolyte, and the reinforcement of interface contact between electrode and the electrolyte. Final ly, the overall energy conversion efficiency of DSSC with PANI50%(in weight) a cetylene black electrolyte is 48% of that of liquid DSSC. Therefore, the PANI a cetylene black composition is a credible alternative to hole conductor in ap plication of solid DSSC.
    10  基于遗传EM算法的航班到达延误状态空间模型
    chenhaiyan
    2011, 28(3):276-281.
    [Abstract](1844) [HTML](0) [PDF 303.02 K](1174)
    Abstract:
    11  Unmanned Aerial System and Flight Control: A Review
    Pu Huangzhong et al
    2015, 32(1):1-8. DOI: 10.16356/j.1005-1120.2015.01.001
    [Abstract](1842) [HTML](0) [PDF 245.86 K](2229)
    Abstract:
    To date unmanned aerial system (UAS) technologies have attracted more and more attention from countries in the world. Unmanned aerial vehicles (UAVs) play an important role in reconnaissance, surveillance, and target tracking within military and civil fields. Here one briefly introduces the development of UAVs, and reviews its various subsystems including autopilot, ground station, mission planning and management subsystem, navigation system and so on. Furthermore, an overview is provided for advanced design methods of UAVs control system, including the linear feedback control, adaptive and nonlinear control, and intelligent control techniques. Finally, the future of UAVs flight control techniques is forecasted.
    12  群智能机制启发的传感器网络能量感知服务质量路由数
    huangru
    2011, 28(2):192-198.
    [Abstract](1810) [HTML](0) [PDF 207.04 K](2030)
    Abstract:
    13  飞机除冰液对高性能混凝土抗冻性的影响
    麻海燕 曹文涛 白康 周鹏 韩丽娟
    2010(4).
    [Abstract](1713) [HTML](0) [PDF 0.00 Byte](227)
    Abstract:
    The influence of glycol, the main composition of the most frequently used aircraft dicer, on the freezethaw durability of high performance concrete (HPC ) is investigated. Freezethaw durability of HPC is tested by accelerated freez e thaw test. Four kinds of the solution, i.e., tap water, 35% NaCl solution, glyc ol solutions, and a LBRA type commercial aircraft deicer are employed. Results s how that freezethaw durability of HPC exposed to glycol solutions is closely related to the solution concentrations. The failure of HPC exposed to 35% gl ycol solution is similar to that of those exposed to 35% NaCl solution, i.e., serious surface scaling. While the damage of HPC exposed to 125%—2 5% glycol solutions is postponed. Compared with glycol solution, the commercia l aircraft deicer has much more negative effects on HPC freezethaw durability compared with 35% NaCl solution. In t he presence of com mercial aircraft deicer for HPC subjected to freezethaw cycles, the deteriora tion is mainly due to scaling and spalling.
    14  实心/空心杆结构的损伤容限与疲劳寿命估算
    Dura Hari Bahadur
    2011, 28(2):169-175.
    [Abstract](1679) [HTML](0) [PDF 1.21 M](2103)
    Abstract:
    15  超高/超声速轴向运动梁的模态频率特性
    wangliang
    2011, 28(2):163-168.
    [Abstract](1663) [HTML](0) [PDF 209.16 K](2276)
    Abstract:
    16  高超声速飞行器自抗扰分数阶PID控制器设计
    qinchangmao
    2011, 28(3):240-245.
    [Abstract](1627) [HTML](0) [PDF 166.17 K](1999)
    Abstract:
    17  法国MBDA爆震和连续爆震波发动机的研发
    Falempin Francois
    2011, 28(1):12-22.
    [Abstract](1605) [HTML](0) [PDF 4.78 M](1311)
    Abstract:
    18  使用液态化学循环的高热效率动力研究
    Childs Peter R N
    2011, 28(1):1-11.
    [Abstract](1596) [HTML](0) [PDF 269.18 K](1925)
    Abstract:
    19  基于GIS的机场净空障碍物评定研究
    luochengli
    2011, 28(3):294-299.
    [Abstract](1583) [HTML](0) [PDF 1.82 M](2160)
    Abstract:
    20  微型叶轮机械联合试验台设计
    夏晨 黄国平 陈杰
    2010(4).
    [Abstract](1561) [HTML](0) [PDF 0.00 Byte](191)
    Abstract:
    Microturbine engine has no enough space for measuring impeller chara cteristics, so the design and the construction of a new test facility of micro tu rbomachinery are presented for microcentrifugal compressors and radial turb ine s. The facility is used for the full speed compressor test and the long duration hot turbine test. To rapidly adjust the testing condition, all regulations of t he opera ting state are automatically completed by the control system. The facility is al so used for testing the impeller performance with a series of diameter from 55 m m t o 180 mm as a result of the modular design. A thermal protection system is desig ned to avoid the heat distortion caused by the high turbine inlet temperature ov er 1 100 K and provide a proper experimental environment for the electronic comp onents. A pho toelectric torque transducer with the accuracy of 1% is designed to measure the torque of rigid shaft at a high speed of 125 000 r/min. The designing techniq ues for microturbomachineries are verified by the impeller testing of the f acility.

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