摘要：The buffeting performance of kilometer-level high-speed railway suspension bridges has a great impact on the smooth operation of high-speed *** investigate the buffeting performance of the structure significantly different from traditional suspension bridges,the first long-span high-speed railway suspension bridge,Wufengshan Yangtze River Bridge(WYRB),is taken as a numerical example to demonstrate the effects of structural parameters and wind field parameters on the buffeting *** on the design information,the spatial finite element model(FEM)of WYRB is established before testing its *** fluctuating wind fields are simulated via both classical and stochastic wave based spectral representation method(SRM).Finite element method is further taken to analyze the parametric sensitivity on wind induced buffeting responses in time *** results show that the vertical displacement is more sensitive to the changing dead load than the lateral and torsional *** larger stiffness of the main girder and the lower sag-to-span ratio are both helpful to reduce the buffeting *** spectrum and coherence function are key influencing factors to the responses so setting proper wind field parameters are essential in the wind-resistant design *** analytical results can provide references for wind resistance analysis and selection of structural and fluctuating wind field parameters for similar long-span high-speed railway suspension bridges.

摘要：利用等效电路理论,初步设计了窗片厚度为1.32mm的回旋行波管盒型输出窗,再加入感性膜片,更改窗片形状,最终设计出了能承受25kW平均功率、相对带宽达到14%、窗片厚度达到1.7mm的Q波段新型宽频带回旋行波管盒型输出窗;采用高频软件HFSS与有限元分析软件ANSYS协同仿真的新方法对回旋行波管盒型窗进行热特性研究表明,盒型窗理论上功率容量达到62kW平均功率,说明输出窗窗片承受25kW平均功率的可行性,窗片中心与边缘的温差为66℃,没有达到陶瓷窗片的临界温差158℃,验证了新型盒型窗设计的合理性。

摘要：为了实现机械产品功能原理的创新,提出了一种将创新设计理论与功能分析方法相结合的功能原理求解过程模型。在该模型中,功能分析主要包括总功能抽象、总功能原理解的确定以及功能分解等。总功能原理解的确定是功能正确分解的前提。为了给功能分解提供可以遵循的模式,提出了基于工艺功能分析的方法,引入了输入约束功能的概念,并给出了功能分解的5个详细步骤。为了给原理求解提供有力的工具支持,将创新设计理论中的物场分析、效应知识库以及冲突解决原理等嵌入到了总功能和分功能原理求解过程中,使得创新设计理论的优势在模型中得以有效发挥。应用这一模型,实现了颜料灌装机的创新设计。

摘要：A new process of AlN removal from secondary aluminum dross(SAD)by pyrometallurgical treatment with added cryolite was applied for solving the problem of recycling the secondary aluminum *** response surface methodology(RSM)was used to design experiments and optimize *** results show that adding the appropriate amount of cryolite can effectively promote the oxidation of AlN in the SAD,and too much cryolite will reduce the promotion *** effects of roasting temperature and cryolite on the denitrification rate are the most significant(p<0.0001)followed by holding *** values of the denitrification rate are found to be in good agreement with experimental values(R^(2)=0.9894 and R_(adj)^(2)=0.9775),which confirms the validity of the model *** optimum conditions of roasting temperature of 750°C,holding time of 194 min,mass fraction of cryolite of 17.7%are obtained according to the quadratic *** these conditions,the maximum actual denitrification rate reaches 94.71%and the AlN content in the SAD is only 0.55 wt%.The unfired brick with compressive strength of 18.62 MPa(GB/T 2542−2012)was prepared based on the roasted SAD.

摘要：Thermodynamic simulation was conducted to design a new process of stepwise precipitating NH_(4)VO_(3)and NaHCO_(3)from regulating the CO_(2)carbonation of Na_(3)VO_(4)***,a new V(V)speciation model for the aqueous solution containing vanadate and carbonate is established by using the Bromley-Zemaitis activity coefficient ***,thermodynamic equilibrium calculations are conducted to clarify the behavior of vanadium,carbon,sodium,and impurity species in atmospheric or high-pressure *** ensure the purity and recovery of vanadium products,Na_(3)VO_(4)solution is initially carbonated to the pH of 9.3-9.4,followed by precipitating NH_(4)VO_(3)by adding(NH_(4))_(2)CO_(3).After vanadium precipitation,the solution is deeply carbonated to the final pH of 7.3-7.5 to precipitate NaHCO_(3),and the remaining solution is recycled to dissolve Na_(3)VO_(4)***,verification experiments demonstrate that 99.1%of vanadium and 91.4%of sodium in the solution are recovered in the form of NH_(4)VO_(3)and NaHCO_(3),respectively.

摘要：自由曲面前照灯是最具发展潜力的前照灯之一。自由曲面前照灯的反射器是无法用数学方程来描述的自由曲面,其设计一直是前照灯设计中的一个难点。研究用计算机仿真设计来进行自由曲面前照灯的设计。其主要内容包括光源建模、自由曲面反射器的设计和前照灯照明效果模拟三大部分。论文给出了设计实例结果。

摘要：针对一类不确定混沌系统设计了基于快速模糊干扰观测器的鲁棒terminal滑模控制方案.首先通过设计快速模糊干扰观测器,克服了传统模糊干扰观测器在误差较小时收敛速度慢的缺点.然后严格证明了在存在未知干扰和不确定的情况下,同步误差及观测器误差均在有限时间内收敛到非常小的区域.最后对Duffing-Holmes混沌系统进行仿真,结果表明了所设计干扰观测器的优越性和闭环控制方案的有效性.

摘要：为了研究车轮的13°冲击性能,提出了一种基于疲劳和13°冲击性能的车轮结构设计和优化方法。以16×61/2J型车轮为研究对象,基于动态弯曲疲劳试验和动态径向疲劳试验对车轮进行了联合拓扑优化,设计了一个镁合金轮辋和铝合金轮辐的组装式车轮结构。建立了组装式车轮13°冲击试验的有限元模型,基于不同应变率下AZ91D镁合金和6061铝合金的材料本构模型分别分析了冲锤正对辐条和正对窗口冲击两种工况下车轮的应变,并研究了13°冲击性能与车轮结构之间的关系。利用网格变形技术建立了组装式车轮在两种工况下的参数化模型并定义了12个设计变量,使用Isight软件平台集成DEP-MeshWorks和LS-DYNA软件建立车轮多目标优化模型,利用最优拉丁超立方和Box-Behnken设计拟合了径向基RBF网络近似模型并验证了近似模型的精度。利用所建立的近似模型,以车轮质量和冲锤正对辐条冲击时轮辐的最大应变最小为目标,其余应变为约束,采用第二代非劣排序遗传算法(NSGA-Ⅱ)对车轮进行了多目标优化设计。得到了Pareto前沿,综合考虑了车轮13°冲击性能条件下,选取了一个妥协解作为优化设计结果。结果表明:在满足车轮各项13°冲击性能要求的条件下,优化得到的组装式车轮与同型铸造铝合金车轮相比减重30.65%。

摘要：通过定常模拟的方法,研究了驻室式处理机匣对高负荷、高马赫数孤立转子性能的影响.结果表明:相同的处理机匣结构在不同的转速下取得的效果存在较大差异,在设计转速时,处理机匣并没有使风扇转子的失速裕度得到改善,并且效率下降约2.8%;在非设计转速时,处理机匣扩稳作用得到充分体现,转子稳定性得到较大程度的加强,并且没有导致转子性能的下降.通过对处理机匣内部流场的详细分析,揭示了驻室式处理机匣的扩稳机理.

摘要：Active fault creep slip induces deformation of rock mass buried deeply in fault zones that significantly affect the operational safety of long linear projects passing through *** distribution patterns of rock masses in active fault zones which have been investigated previously are the key design basis for such ***,a discrete element numerical model with different fault types,slip time,dip angles,and complex geological features was established,and then the creep slip for normal,reverse,and strike-slip faults were simulated to analyze the displacement distribution in the fault rock mass.A disk rotation test system and the corresponding laboratory test method were developed for simulating rock mass displacement induced by creep slippage of faults.A series of rotation tests for softand hard-layered specimens under combined compression and torsional stress were conducted to verify the numerical results and analyze the factors influencing the displacement *** S-shaped displacement distribution independent of fault dip angle was identified corresponding to reverse,normal,and strike-slip *** results indicated that the higher the degree of horizontal extrusion,the softer the rock mass at the fault core,and the higher the degree of displacement concentration in the fault core;about 70%of the creep slip displacement occurs within this zone under 100 years of creep slippage.