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Abstract: In this paper,using numerical solution method of vector diffraction theory,we discuss the dependence of reflectivity upon structural parameters of subwavelength grating,particularly upon substrate thickness.It can be used as the basis for design
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文摘:利用矢量衍射理论的数值求解方法，研究了亚波长光栅结构参数对反射率的影响，特别是基底厚度对反射率的影响，这些为设计和制作具有优良的抗反射性能的二元光学元件提供了设计依据。 |
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Abstract: In this paper,using the improved L-P method and the interpolation perturbation method,the authors seek to solve a class of the damped strongly nonlinear free oscillation problems.Its first order approximate solution is obtained.
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文摘:本文用插值摄动法及改进的L-P法相结合的方法求解了一类有阻尼的强非线性自由振动问题，得到了一级近似解。 |
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Abstract: In this paper,virtual instrument technique is introduced into dynamic electric parameter measuring.VI's function units are constructed with structured software design method.A design and development method of virtual measuring instrument has bee
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文摘:将虚拟仪器技术引入动态电参量测量，用结构化软件设计的方法构造虚拟仪器的功能组件，提出了一种虚拟测量仪表的设计与开发方法。 |
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Abstract: In this paper,we derive predictive models of system and auxiliary system from double constant alterations respectively.The controller based on d-step ahead predictor can locate the closed loop poles at desired positions,whose parameters are adju
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文摘:引入双恒等变换推导出系统及辅助系统的的d步预测模型，基于估计器的自校正控制器能将闭环极点配置在所希望的位置，它的参数是由与其相互独立的对象参数调节.提出使用辅助估计器克服丢番方程的病态问题.仿真表明在存在可测干扰的情况下该系统具有良好的动态性能. |
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Abstract: In this paper,we develop a lofting method for railway tunnel profile including straight way and curve way,analyse carefully the error resources of lofting,and move an amendment one by one,precision analysis to the amended lofting formula shows t
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文摘:提出了铁路隧道断面（包括直道、弯道和坡度）的放样扫描方法，详细分析了放样扫描的误差来源，并逐一给出了修正方案，对修正后的放样公式作了精度分析，放样精度达到了预定的要求。 |
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Abstract: In this paper,we established the artificial neural network of the fault diagnosis of rotary mechanism using simulated annealing algorithm.We trained the neural network with seven kinds of fault sample of rotary mechanism and apply the neural net
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文摘:用模拟退火算法建立了旋转机械故障诊断的人工神经网络模型,以幅值谱中七个频段上的幅值为网络的输入模式,对旋转机械常见的几种故障进行分类训练,并应用于待识别故障样本的识别计算,证明该方法在旋转机械故障诊断中是有效的。 |
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Abstract: In this paper,we have had finite-calculation to dynamic structure according to the muffler drawings and the relation parameters.As we have received a disc impedance muffler model set at the entrance of LGA fan by using the optimum design way bef
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文摘:针对由最优化设计方法获得的LGA风机进口安装的圆盘式阻性消声器模型，在未对消声器实物加工之前，根据消声器的图纸及有关数据进行了有限元动力计算，从而初步了解消声器的动态特性.为设计优良的消声器提供新的有效途径. |
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Abstract: In this paper,we propose an improved Lagrangian relaxation algorithm to solve job-shop scheduling problems.Besides the addition of augmented objective,we expand the search scope of near-optimal solutions and improve the computational efficiency
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文摘:针对车间调度问题，提出了一种改进的拉氏松弛算法.在增加辅助目标函数的基础上，通过对子问题的限制和搜索策略的改变，使拉氏算法的计算量减少，近优解的搜索能力有很大改善.本文还提出了一种基因优化算法，充分利用拉氏算法得到的多个近优解，进一步优化结果.仿真结果表明对车间调度问题得到了较好的结果.本方法也可用于其它有约束的规划问题. |
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Abstract: In this paperfor real marine underwater noise data by using synchronous acquisition of pointsinputs-output covariance matrix is obtained by filtering compensating delay and crosscorrelation.Then the contribution of inputs to output in network
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文摘:本文对多点同步测量方法记录的舰艇噪声数据,采取在时域上作滤波、时延补偿和互相关得到输入输出协方差矩阵,然后从输入输出协方差矩阵计算在网络意义和偏相干意义下输入对输出的贡献以及其它有用的量。 |
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Abstract: In this paper，a ray-optics analysis is performed to investigate the asymmetry of dual beam scanning field produced by a rotating polygon.Some basic equations of dual beam scan are derived，such as，the position vector for the incident point，the sc
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文摘:应用几何光学理论研究了多光束转镜扫描场的非对称性，导出多光束扫描入射点位置矢量、反射线标量表达式、观察面上的扫描轨迹方程，并研究了扫描远场的非对称性。 |
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Abstract: In this paper，the essential chemical composition on the spheroidized quality of small-sized ductile iron pipes have been investigated，and the degeneration of spheroidal graphite in ductile iron pipe was analyzed，under practical manufacturing con
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文摘:在实际生产的条件下，研究了小口径球墨铸铁管在球化后主要化学成分的分布和变化对铸态球化效果的影响，并对铸管存在的球化衰退进行了分析；根据试验结果，提出了对成分及工艺条件进一步的改进措施。 |
