虚拟测试平台技术研究

提出将各种主流仿真、计算机辅助设计、诊断推理和虚拟仪器软件的核心运行组件进行集成,构成功能完备、配置灵活、用户免编程的虚拟测试平台,来满足高性能智能化产品动态测试、参数调整与优化、诊断排故的需要。对虚拟测试平台所具备的功能、系统结构及关键技术进行了详细的论述,最后结合智能运动控制系统的全数字与半实物仿真测试,就虚拟测试平台的典型应用进行了讨论。     

Attitude analysis of space debris using SLR and light curve data measured with single-photon detector

Attitude is the important parameter for active debris removal and collision avoidance. This paper deduced the spin axis orientation and spin period of the rocket body, CZ-3B R/B (NORAD ID 38253), using the satellite laser ranging and light curve data measured with single-photon detector at Graz station. The epoch method and LC & SLR residuals fitting were combined to determine these values. The derived right ascension angle was around 220°, the declination angle was near 64° and the sidereal period was calculated to be 117.724 s, for 2017-07-03. The results derived from the two distinct methods were mutually validated. Rocket bodies are a major contributor to space debris and this work provides a reference for attitude determination and attitude modelling.     

Type synthesis of 2-DoF rotational parallel mechanisms actuating the inter-satellite link antenna

This paper focuses on the type synthesis of two degree-of-freedom (2-DoF) rotational parallel mechanisms (RPMs) that would be applied as mechanisms actuating the inter-satellite link antenna. Based upon Lie group theory, two steps are necessary to synthesize 2-DoF RPMs except describing the continuous desired motions of the moving platform. They are respectively generation of required open-loop limbs between the fixed base and the moving platform and definition of assembly principles for these limbs. Firstly, all available displacement subgroups or submanifolds are obtained readily according to that the continuous motion of the moving platform is the inter-section of those of all open-loop limbs. These subgroups or submanifolds are used to generate all the topology structures of limbs. By describing the characteristics of the displacement subgroups and submanifolds intuitively through employing simple geometrical symbols, their intersection and union operations can be carried out easily. Based on this, the assembly principles of two types are defined to synthesize all 2-DoF RPMs using obtained limbs. Finally, two novel categories of 2-DoF RPMs are provided by introducing a circular track and an articulated rotating platform, respectively. This work can lay the foundations for analysis and optimal design of 2-DoF RPMs that actuate the inter-satellite link antenna.     

大型卫星姿态机动的滑模变结构控制技术

研究了大型卫星三轴大角度姿态机动控制。建立了以控制力矩陀螺作为执行机构的大型卫星姿态动力学方程,针对快速性和鲁棒性要求,设计了一种滑模变结构控制器。控制器基于反馈四元数,避免了源自三轴大角度机动欧拉角描述的奇异性,且滑动模态能满足Lyapunov意义的渐近稳定。仿真结果验证了该控制器的有效性和优良性能。     

星载电子设备元器件随机振动疲劳分析

星载电子设备通常要经历各种振动环境,在恶劣的随机振动环境中,设备中的元器件管脚及焊点容易出现疲劳问题。文章应用Miner疲劳损伤累积理论及三带宽技术,提出了一种实用有效的分析元器件管脚及焊点进行随机振动疲劳寿命的方法。     

多任务使命平台上电子设备发展趋势研究

通过对侦察、对抗和打击一体化系统在现代战争中的地位与作用的介绍,分析了多任务使命平台上各种电子设备之间的冲突,提出了在多任务使命平台上综合电子设备的发展趋势,在此基础上得出几点启示.     

三维机翼结冰模拟

针对机翼结冰问题,利用欧拉法求解空气水滴两相流流场,通过Fluent软件用户自定义函数功能编程求解三维机翼表面水滴局部收集系数以及结冰情况.在计算中.将水溢流方向沿机翼弦向和展向分解,以此对Messinger结冰热力学模型进行改进,使之更符合三维情况,并在此基础上进行三维传质传热分析;修正传统的二维表面对流换热系数求解...     

惯导平台系统连续翻滚试验测试方法研究

首先以X加速度计坐标系为基准建立了平台台体坐标系,推导了基于框架角的姿态方程,即状态方程,并以三个加速度计输出作为观测量建立了观测方程。在此基础上,应用D最优设计方法对平台系统重力场连续翻滚测试进行了优化设计,给出了改进的扩展卡尔曼滤波方程。最后,试验结果验证了该测试方法的有效性。     

旋转调制式激光惯性测量单元的误差标定研究

本文针对旋转调制式激光惯性测量单元的结构特点,分析了其误差特性,提出了单元体自旋转的误差标定方法,实现了惯性测量单元的误差分离与快速精确标定.实验证明该方法测试方法简单,操作过程容易,标定结果满足系统精度的需要.     

基于DSP和LabVIEW的陀螺电机测速系统设计

本文提出了一种基于数字信号处理器TMS320LF2407A和LabVIEW的陀螺电机测速系统.该系统利用DSP芯片内部集成的捕获单元模块、串行通信接口(SCI)完成转速信号的捕获以及数据通信工作,利用LabVIEW的信号处理功能完成波形实时显示、频谱分析、数据保存工作.测试结果表明,该设计方案稳定可靠.