HPM短脉冲雷达发射信号的重构与仿真

研究分析了HPM信号的包络相位等特征,得知其包络不规整而且相位存在抖动,故采用高斯多峰模型拟合其包络,多项式模型拟合其相位,结合包络与相位的拟合模型获得了HPM信号的脉冲调制模型,最后在Matlab中利用该重构方法对多个HPM信号进行重构,均获得了较小残差的重构信号,检验得知该方法能够对HPM短脉冲雷达发射信号实现准确有效的信号重构。

可重构制造仿真单元在车间规划过程虚拟仿真中的应用研究

现实车间设计早期涉及较大的返工工作量,以快速、准确、可扩展为目标,提出一个模块化仿真设计新方法,开发Visual Components的可重构制造仿真单元,对多种布局和物流方案进行定性和定量的直观分析评价,Visual Components的可重构制造仿真单元已应用在新建自动化制造车间的布局与物流设计中,并取得显著效果。

基于数据驱动的航天产品总装线建模、仿真与重构技术研究

生产系统仿真建模技术广泛应用于生产系统规划、评估与验证等过程,但是随着系统的复杂度与需求多样性的提升,传统的手工建模方法效率低、通用性差和重用性低等问题日益显现。论文从航天产品装配过程的特点出发,基于数据驱动建模与仿真技术,构建了仿真模型的数据模型,在此基础上实现了模型自动重构与仿真功能。最后,基于Plant Simulation仿真软件,设计并开发了航天产品数据驱动建模、仿真与优化及三维可视化布局数据管理系统。论文以某典型航天产品总装车间为研究对象,验证了该方法与系统的可行性。

基于滤波算法的曝光图像多特征细节识别仿真

为解决曝光图像信息传递效果差的问题,提出对多序列曝光图像进行垂直方向切片后卷积的方法,然后采用Anscombe变换与图像滤波算法结合,去除曝光图像中的除泊松噪声增强曝光图像的边缘与细节信息。仿真结果表明,在增强曝光图像多特征信息能力上,双边滤波较高斯滤波效果更明显,平均梯度提高了10.2%。基于滤波的多曝光图像特征融合重构可以有效的提高曝光图像的细节信息,提高图像传递质量。

面向服务的可组合可重用仿真技术研究

分析了仿真技术发展现状和仿真面临新需求,提出了面向服务的仿真平台技术框架,该框架基于面向服务架构和软件组件技术,可较好地满足仿真灵活性和扩展性的要求。构建了一个面向服务的作战仿真平台验证系统,该平台采用Java EE/EJB组件规范分别实现了通用仿真服务和领域模型服务功能,实验证明面向服务仿真架构支持仿真模型的组合和重用,可有效提高仿真效率、灵活性和开放性。

基于RCS数据重构调频步进雷达动态目标回波

调频步进雷达波形通常具有大带宽,由目标逐个频点的RCS电磁计算数据直接重构雷达回波,面临计算量巨大且高速运动目标回波难以实时计算的问题。基于线性雷达目标理论和FFT内插方法,提出了一种调频步进雷达动态目标回波信号生成的新方法,重点解决chirp信号子脉冲高速运动目标回波的实时生成问题。仿真实验验证了算法的有效性。

面向可重构的离散式生产系统快速建模方法

以离散式生产系统为研究对象,提出了一种快速构建面向具体应用对象的建模的方法。该方法将仿真资源分为实体模型库、逻辑控制库和仿真数据库,模型生成器可以利用仿真资源将模型实例化后自动放入仿真平台中,实现快速建立仿真模型。同时也解决了建模过程中由于生产模式的变化而产生的多次重构问题,提高仿真模型的可维护性、可扩展性。最后以某企业的生产为例,验证了该方法的有效性。

Design of a novel modular self-reconfigurable robot capable of self-turning

To solve the problem of inaccurate angle adjustment in the self-assembly process, a new homogenous hybrid modular self-reconfigurable robot-Xmobot is designed. Each module has four rotary joints and a self-turning mechanism. With the proposed self-turning mechanism, the angle adjusting accuracy of the module is increased to 2°, and the relative position adjusting efficiency of the module in the self-assembly process is also improved. The measured maximum moving distance of the proposed module in a gait cycle is 11.0 cm. Aiming at the multiple degree of freedom （MDOF） feature of the proposed module, a motion controller based on the central pattern generator （CPG） is proposed. The control of five joints of the module only requires two CPG oscillators. The CPG-based motion controller has three basic output modes, i. e. the oscillation, the rotation, and the fixed modes. The serpentine and the wheeled movements of the H-shaped robot are simulated, respectively. The results show that the average velocities of the two movements are 15. 2 and 20. 1 m/min, respectively. The proposed CPG-based motion controller is evaluated to be effective.

Motion simulation and experiment of a novel modular self-reconfigurable robot

Based on the character of the modular self-reconfigurable （MSR） robot, a novel homogeneous and lattice MSR robot, M-Cubes, was designed. Each module unit of the robot has 12 freedoms and is composed of six rotary joints and one cubic link. An attached/detached mechanism was designed on the rotary joints. A novel space transmitting system was placed on the inner portion of the cubic link. A motor separately transmitted torque to the six joints which were distributed equally on six surfaces of the cubic link. The example of a basic motion for the module was demonstrated. The result shows that the robot is concise and compact in structure, highly efficient in transmission, credible in connecting, and simple in controlling. At the same time, a simulator is developed to graphically design the system configuration, the reconfiguration process and the motion of cluster modules. The character of local action for the cellular automata （CA） is utilized. Each module is simplified as a cell. The transition rules of the CA are developed to combine with the genetic algorithm （GA） and applied to each module to accomplish distributed control. Simulation proves that the method is effective and feasible.

Speed aware self-adapting and reconfigurable routing mechanism in MANET

A self-adapting and reconfigurable routing mechanism is proposed according to the average moving speed of the nodes in mobile ad hoc network （MANET）. This mechanism is based on the perception of moving speed and a predesigned selection metric to choose the optimal routing protocol. The routing evaluation and selection metric is derived by OPNET simulations. AODV and OLSR are used as the example to show the process of this mechanism with the moving speed varying. The routing protocol can be configured without central configuration and human management. Besides, the overhead of the mechanism is reasonable and doesnot affect the quality of service （QoS） of the traffic in the network. Results show that the optimal routing protocol can be configured adaptively according to the speed so that better performance than end-to-end delay and packet delivery ratio. a specific protocol can be obtained in terms of

管道IMU弯曲应变解算算法优化与全尺寸试验验证

【目的】基于惯性导航(Inertial Mapping Unit,IMU)内检测器的管道弯曲应变识别技术目前已被国内外广泛应用。IMU内检测器通过陀螺仪获取的俯仰角、航向角等进行解算并获取管道全线弯曲应变,由于内检测器实际运行时存在因自身尺寸等原因造成的检测轨迹线偏移,导致IMU检测弯曲应变与管道真实弯曲应变之间存在一定误差。【方法】基于实际内检测器尺寸建立无异常振动等干扰的IMU内检测器仿真模型,构建管径508 mm管道不同弯曲应变条件下的仿真数据库,提出基于神经网络-决策树深度学习模型的解算优化算法,开展了误差分析与弯曲应变解算算法研究。开展全尺寸管道弯曲应变牵拉试验,验证解算优化算法的可行性与准确性。【结果】随着管道弯曲应变增大,IMU内检测器检测弯曲应变与管道真实弯曲应变之间的误差随之增大。解算后弯曲应变数据的均方误差、误差协方差、误差标准差分别由0.0070、0.0049、0.0702降低至0.0012、0.0016、0.0126,而表示相关性的决定系数由0.443增至0.981。采用全尺寸牵拉试验验证该算法,弯曲应变与应变片检测真弯曲应变之间误差分别降低了79.6%、79.4%、76.0%。【结论】通过有限元模拟与全尺寸牵拉试验数据验证了所提出解算优化算法的可行性与准确性,可为基于IMU内检测的管道真弯曲应变获取提供技术支撑与指导。(图9,表2,参25)