摘要：As a new three-dimensional(3-D)modulation,Polarization Quadrature Amplitude Modulation(PQAM) can be regarded as the combination of Pulse amplitude modulation(PAM) and Quadrature Amplitude Modulation(QAM) *** can better improve the digital communication efficiency and reduce the Symbol error rate(SER) of the system than one-dimensional or two-dimensional modulation *** to design a feasible constellation is the most concerned problem of PQAM *** paper first studies the relationship between the SER theoretical value of PQAM and the distribution of M and N,proposes a new M,N allocation ***,a new and straightforward design method of constructing higher-level 3-D signal constellations,which can be matched with the PQAM,and the constellation can divided into three different structures according to the ary for ***,the simulation results show that:in PQAM system,the modulation scheme and the constellation mapping scheme are proposed in this paper which can effectively reduce the system SER and improve the anti-noise performance of the system.

摘要：结合Taguchi稳健设计方法和柔性薄板零件装配偏差建模,提出了一种柔性薄板装配夹具稳健设计方法.通过对柔性薄板零件装配过程的分析,建立了反映装配质量与零件制造偏差、夹具定位偏差和夹具定位方案关系的装配偏差模型.利用Taguchi方法进行夹具定位的稳健设计时,以夹具定位位置为设计参数,各零件制造偏差和夹具定位偏差为噪声参数,结合柔性薄板装配偏差建模方法提出了柔性薄板夹具稳健设计的信噪比计算方法,通过安排正交试验的内外表,分析各夹具定位方案下装配质量对各偏差源的稳健性,确定稳健的夹具方案.该方法通过一个简单柔性薄板装配得到了验证.

摘要：A pseudo-dynamic testing program was generated on a fabricated composite frame with steel plate shear walls （SPSWs） to study its seismic perlbrmance. The specimen was a three-storey single-bay frame, which was composed of H- section steel columns and composite beams, and was assembled by bolted height-adjustable steel beam-to-column connections （BHA connections）. Beam-only-connected SPSWs were selected as lateral load resisting members. The specimen was subjected to four ground motions of progressively increasing intensity. The results showed that： （1） beam-only-connected S PSWs provided sufficient lateral load resistance, lateral stiffness, and energy dissipation capacity to the fabricated frame via the tension ficld action developed in their infill panels; （2） the fabricated frame, assembled by BHA connections, exhibited substantial redundancy and good ductility; （3） an undesirable failure mode of the fabricated frame, in huge earthquakes, included severe cracking in composite beams and block shear failure in SPSWs＇ connections; （4） the inter-storey shear force distribution determined by ASCE/SE1 7-10 was verified with experimental data.

摘要：结合合作博弈理论和装配产品公差稳健设计建模,提出一种基于Nash仲裁均衡的公差稳健设计方法.首先将考虑稳健设计要求的装配产品质量与成本视为多目标优化对象,通过建立博弈决策方、效用函数,对各博弈方策略进行归属分类,将装配质量和成本多目标优化问题转化为多目标博弈决策问题,并建立相应的博弈模型及效用矩阵,最后采用合作博弈中的Nash仲裁法进行优化求解.该方法应用于车身前端装配总成的公差设计案例,通过与单目标优化方法比较,说明了其工程应用的有效性.

摘要：The slow light propagation in a line waveguide in the two-dimensional triangular photonic crystal has been numerically studied, based on which a wideband photonic crystal waveguide with low group-velocity and low dispersion is proposed. The numerical simulation analysis shows that it is possible to maximize the group index and minimize the group-velocity dispersion in wide bandwidth by increasing the radius of the basic air hole and changing the position of the first two rows of air holes in photonic crystal waveguides. Such a photonic crystal waveguide exhibits low group velocity and low group-velocity dispersion over a broad wavelength range. A larger group index-bandwidth product is achieved in this type of waveguide structure. The numerically computed results present the normalized bandwidth as 0.32%, 0.48% and 0.642% corresponding to the group index of 85, 58 and 45, respectively.

摘要：依据ＨＶＭ（Ｈｏｒｉｚｏｎｔａｌ－Ｖｅｒｔｉｃａｌ Ｍｅｔａｄａｔａ）方法，给出了一个软件系统级设计模型ＨＶＭＤＭ（ＨＶＭ Ｄｅｓｉｇｎ Ｍｏｄｅｌ），并把这一模型应用到大型ＭＩＳ系统的设计中。分析了在系统中增加新的子系统时，系统复杂性的增加情况，并与垂直接口方法进行了比较，证明了该方法的有效性。

摘要：针对一类由偏微分方程(PDE)描述的非线性分布参数系统的鲁棒故障检测观测器(FDO)设计问题进行了研究.采用模态分解法将PDE系统变换成一个等价的无穷维常微分方程(ODE)系统,并根据空间微分算子的特征谱,将无穷维ODE系统表达成有限维慢子系统与无穷维快子系统相耦合的形式.基于慢子系统模型设计有限维FDO,使得无故障残差系统在容许的未知非线性动态和快子系统动态影响下依然渐近稳定,并设计相应的检测门限,以实现故障检测.仿真结果验证了所提方法的有效性.

摘要：针对传统优化技术进行焊点三维形态优化时费时耗力且浪费计算机资源等缺点 ,提出采用“整体”近似优化技术 ,结合线性最小二乘方法、BP( Back Propagation)神经网络 ,在整个设计变量空间上建立问题函数近似面 ,利用该函数近似面来求取目标函数最大值 ,并得到相应的设计变量值 ,达到焊点三维形态优化设计的目的 .最后对线性最小二乘模型、BP神经网络拟合非线性函数的能力和近似优化能力进行了比较讨论 ,结果表明 ,利用“整体”近似优化技术来优化设计焊点形态是简便可行的 ,且 BP网络模型拟合“整体”近似函数面比线性回归模型具有更高的精度 。

摘要：介绍了上海东方艺术中心模型风洞试验概况和主要结果 .给出了屋面在最不利工况下的分块体型系数及平均风压系数的等值线图 ,清楚地显示了此大跨度屋盖结构屋面的风压分布特征 .结果表明 ,周边建筑对所测建筑的风荷载有较大的干扰影响 .最后对分别按规范 (基于平均风压 )和应用统计方法 (基于平均风压和脉动风压 )计算的用于玻璃幕墙设计的风压结果进行了比较 ,结果表明 ,按规范计算的最不利风荷载偏小 。

摘要：设计一个线路勘测设计的三维可视化协同环境,应用主席-委员模式的会议系统结构,以协同可视化设计层和协同管理层为核心的系统框架以及分布式加锁策略等实现多用户间的协同管理。同时,在三维可视化环境中,将每个线路模型的空间对象表示为Agent模型,它由具备推理能力的行为和描述对象空间特征的几何模型组成,以此实现多用户环境下线路的三维可视化协同设计与评价。