摘要：In the case of the given design variables and constraint functions, this paper is concerned with the rapid overall parameters design of trajectory, propulsion and aerodynamics for long-range ballistic missiles based on the index of the minimum take-off *** contrast to the traditional subsystem independent design, this paper adopts the research idea of the combination of the subsystem independent design and the multisystem integration ***, the trajectory, propulsion and aerodynamics of the subsystem are separately designed by the engineering design, including the design of the minimum energy trajectory, the computation of propulsion system parameters, and the calculation of aerodynamic coefficient and dynamic derivative of the missile by employing the software of missile DATCOM. Then, the uniform design method is used to simplify the constraint conditions and the design variables through the integration design, and the accurate design of the optimized variables would be accomplished by adopting the uniform particle swarm optimization(PSO) algorithm. Finally, the automation design software is written for the three-stage solid ballistic missile. The take-off mass of 29 850 kg is derived by the subsystem independent design, and 20 constraints are reduced by employing the uniform design on the basis of 29 design variables and 32 constraints, and the take-off mass is dropped by 1 850 kg by applying the combination of the uniform design and PSO. The simulation results demonstrate the effectiveness and feasibility of the proposed hybrid optimization technique.

摘要：针对经典Arnold变换存在的不足,提出了基于随机数的数字图像置乱方法,设计并实现了一个信息隐藏系统,该系统采用两级信息隐藏模型,针对人类视觉系统对绿色分量最敏感,对蓝色分量最不敏感的特性,在位图的不同分量中嵌入不同数目的比特。实验表明,可以将机密文档或重要数据很好的隐藏在静止图像中,隐藏性能好,信息隐藏量大。

摘要：任意波形发生器作为测试测量设备的一种重要仪器,在航空航天的测量与控制技术领域中得到了广泛应用;当前市场成熟任意波形发生器产品多为国外产品或者国内厂商基于国外FPGA和DAC研制的产品;为了打破技术垄断,提高国产任意波形发生器的自主技术保障能力,研制基于国产芯片的任意波形发生器愈发重要;随着国产芯片设计技术提升,国产FPGA和DAC的性能显著提高,并得到了广泛应用;PXI总线作为当前仪器领域的主要总线类型之一,可以满足大部分测试仪器的通讯要求;基于国产FPGA和DAC器件,从硬件设计和软件设计两个方面出发,成功研制了一款采样率为100 MSa/s的PXI总线任意波形发生器模块,实现了43 MHz信号输出,通过实验测试了模块的功能和性能,完全满足模块指标要求,充分证明了国产芯片在工程设计中的性能特性。

摘要：本文设计了一个基于DCT变换的数字水印系统,实验证明变换域算法具有很好的鲁棒性,能够有效的抵御常见的图像干扰。

摘要：重点探究了直径200 mm超厚层硅片滑移线的影响因素以及控制方法。使用平板硅外延炉加工超厚层外延片,并使用颗粒测试仪SP1和光学干涉显微镜表征滑移线。从热应力是滑移线的主要成因出发,通过对衬底和基座背面凹槽的设计以及升温曲线的控制这三个方面改善了滑移线。结果表明,随着衬底倒角背面幅长和基座背面凹槽深度的增加,外延片的滑移线长度均呈现先减小后增大的趋势。衬底倒角最佳背面幅长为500μm,基座背面凹槽的最佳深度为0.80 mm。同时,在873 K下恒温3 min的升温工艺可以减少厚层硅外延片的滑移线。

摘要：本文研究了Takagi-Sugeno模糊系统的反馈控制器的设计问题.通过构造适当的Lyapunov函数,得到了不确定性模糊控制系统全局指数稳定的充分条件.最后,通过实例来说明结果的可行性与有效性.

摘要：提出了交流换流器自动测试系统的解决方案,分别从硬件和软件两方面做了详细分析,并介绍了各主要参数的测试方法。系统的实际应用表明:本设计方案能够实现交流换流器主要被测参数的自动测试,可靠性和准确性能够满足交流换流器各项技术指标的要求。