High performance two degrees of freedom attitude control for solar sails

The purpose of this paper is to present a high performance solar sail attitude controller which uses ballast masses moving inside the sail’s booms as actuators and to demonstrate its ability of performing time efficient reorientation maneuvers. The proposed controller consists of a combination of a feedforward and a feedback controller, which takes advantage of the feedforward’s fast response and the feedback’s ability of responding to unpredicted disturbances. The feedforward controller considers the attitude dynamics of the sailcraft as well as the disturbance torque due to the center of pressure offset to the center of mass of the sailcraft. Additional disturbance torques, like those coming from the environment or from asymmetry of the spacecraft structure, are then handled by the feedback controller. Simulation performance results are finally compared against results available in the literature.     

扭矩扳子检定装置量值传递相关问题探讨

通过对扭矩量值传递中有关器具工作原理及工作时受力的分析,指出了用扭矩扳子检定装置检定扭矩扳子时检定结果难以一致的原因,给出了解决办法,并进行了验证。     

Postcapture stabilization of space robots considering actuator failures with bounded torques

Space robotics is regarded as one of the most impressing approaches for space debris removal missions. Due to the residual momentum of debris, it is essential to stabilize the base rapidly after capture. This paper presents a novel control strategy for stabilization of a space robot in postcapture considering actuator failures and bounded torques. In the control strategy, the motion of the manipulator is not regarded as a disturbance to the base; in contrast, it is utilized to compensate for the limitation of the control torques by means of an inverse dynamical model of the system. Different scenarios where actuators are external mechanisms or momentum exchange devices have been carried out, and for actuator failures, both single- and two-actuator failures have been considered. Regarding to the performance of actuators, control torques are bounded. In cases that either single or two actuators have failed, the base can be stabilized kinematically when actuators are external mechanisms, but can only be stabilized dynamically when only momentum exchange devices are used. Finally, a space robot with a seven-degree-of-freedom manipulator in postcapture is studied to verify the validity and feasibility of the proposed control scheme. Simulation results show that the whole system can be stabilized rapidly.     

低本底α、β测量仪效率校准研究

简述了低本底α、β测量仪效率校准的基本原理,研究了自吸收和面积与探测效率的关系,评定了效率校准中的不确定度,并分析了效率在α、β样品测量中的应用。     

一种用于 ACAS 的相位校准方法

校准是用于 ACAS 发射机的一项关键技术,本文给出了一种新的基于比相的实时校准方法,去除了发射通道幅度对通道相位差的影响,介绍了该方法的原理,并在 FPGA 硬件平台上完成了该方法的仿真和验证,通过实测数据的分析与处理,证明了这种方法的可行性     

First astrometric observations of space debris with the MéO telescope

The MéO (for Métrologie Optique) telescope is the Satellite and Lunar Laser Ranging (SLR) dedicated telescope of Observatoire de la Côte d’Azur (France) located at plateau de Calern. The telescope uses an altazimuth mount. The motorization of the mount has a capability of 6 deg/s allowing the follow up of Low Earth Orbits (LEO) satellites, as well as Medium Earth Orbits (MEO) and geostationary (GEO) satellites, and the Moon. The telescope has a primary mirror of 1.54 m. It uses a Nasmyth focus equipped with an EMCCD camera. The telescope field of view, defined by the equivalent focal length and the size of the camera, is currently 3.4 arcmin × 3.4 arcmin.     

8400压力测量采集系统的校准

在压力测量的实际应用中,压力校准成为一种新的技术需求。本文介绍了8400压力测量系统的结构组成及特点,对该系统提出一种切实有效的校准方法。通过该校准方法,可保证8400压力测量系统的准确可靠,为工程实际应用提供更好的技术支撑。     

Robust control for an unmanned helicopter with constrained flapping dynamics

In this paper, a neural network based adaptive prescribed performance control scheme is proposed for the altitude and attitude tracking system of the unmanned helicopter in the presence of state and output constraints. For handling the state constraints, the barrier Lyapunov function and the saturation function are employed. And, the prescribed performance method is used to deal with the flapping angle constraints for the unmanned helicopter. It is proved that the proposed control approach can ensure that all the signals of the resulting closed-loop system are bounded, and the tracking errors are within the prescribed performance bounds for all time. The numerical simulation is given to illustrate the performance of the proposed scheme.     

A scalable bus-based attitude control system for Solar Sails

Recently, there has been a renewed interest in Solar Sails as an alternative means of space propulsion. Many different attitude control systems have been designed for Solar Sails taking advantage of the centre-of-mass (CM)/centre-of-pressure (CP) offset while utilising the main sail structure to position the actuators. However, by attaching actuators to the main sail, these systems increase the risks involved in the deployment subsystem.     

量化选取应变电桥在载荷校准中的应用

在载荷校准中,应变电桥的选择直接影响载荷测量的精度。以起落架单向加载工况下的电桥为研究对象,用数学公式来量化表示电桥的线性度、响应系数和单向性等基本特性,并根据其特性筛选电桥,然后用所选电桥建立载荷方程。结果表明该方法具有效率高、质量高、精度高等优点,同时也实现了载荷方程的自动化计算。