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一种飞船用并联式太阳电池阵指向机构设计与分析 总被引:1,自引:0,他引:1
为满足太阳电池阵在飞船上大范围指向要求,实现光照效率最大化,设计了一种用于飞船等航天器的新型并联式太阳电池阵指向机构,采用规则对称的模块化设计形式,具有工作空间大、可靠性高等特点。对新型并联式太阳电池阵指向机构进行了运动学正逆解计算,运用极限边界搜索法在MATLAB中计算了工作空间,建立了基于ADAMS的虚拟样机模型,并对其逆解进行了验证,以工程可实现性为原则,得出了多个逆解的筛选原则,为控制系统的参数筛选提供了依据。通过对并联机构的冗余特性进行分析,证明了在某一驱动组件卡死时,其仍具备较大的工作空间。该并联式指向机构还可用于航天器矢量推进器、天线指向等空间领域。 相似文献
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超声波直接驱动电极的小型电火花加工装置的设计 总被引:2,自引:0,他引:2
介绍一种新型电极直接驱动的小型电火花加工装置及驱动控制原理.主要由压电驱动体、电极丝和导向器组成。电极的进给方向由两个压电驱动器的振动方式来决定.该装置具有体积小、重量轻、结构简单、响应速度快等优点。 相似文献
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新一代的气象卫星是自旋稳定同步卫星,其太阳电池壳既是卫星结构本体,又是太阳电池阵硅片载体,该壳是一个大、轻型蜂窝夹层结构件。本报告将工艺试验、试验件的试制工作进行了总结,详细介绍了结构形式及主要设计指标、选材、成型工艺方案考虑、工艺过程中解决的技术难题。 相似文献
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针对LEO(Low Earth Orbit,近地轨道)卫星的太阳电池阵输出功率衰减问题,在分析卫星轨道半长轴、太阳入射角、日地距离等参数变化与影响的基础上,提出按照轨道衰减快慢来区分太阳活动高年与低年,进而通过区分高年与低年,再根据不同季节分别进行太阳电池阵输出功率的衰减估计,而无须做功率归一化。同时,重点关注了夏至前后的最低输出功率的衰减情况,以此作为在轨卫星长期管理中的能源参考,建立平均电流和功率衰减因子估计模型,并结合实际工程数据进行了衰减估计。结果表明,太阳电池阵输出功率的年衰减因子约为-0.012,年衰减率约为1.2%。该结果可应用于在轨卫星长期管理的遥测诊断辅助。 相似文献
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万翀 《民用飞机设计与研究》2011,(2):40-42
介绍了航空照明的发展趋势,电源驱动在近年内的发展并指出未来航空照明系统对照明光源驱动的需求,其目的主要是通过对不同的驱动控制架构进行分析,研究出适用于现代航空照明系统的驱动方案,为工程应用提供指导意义。 相似文献
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In this paper, a method of using a root hinge drive assembly (RHDA) to control the solar array deployment is provided and a multi-DOF mechanism dynamic model of the system is established. In this way, the root hinge torque can be calculated iteratively. Then taking the predicted torque as a reference, a RHDA is designed for a large multiple-stage packaging and deployable solar array system. The control effect of the drive assembly is validated by ground tests. The test results indicate that the solar arrays can be deployed smoothly, and the deployment velocities are restricted by the drive assembly as expected. During the tests, the RHDA output speed and output torque are obtained. In order to examine the impact force when the yoke is lock-up with a hard stop, dynamics simulations are performed according to the actual behavior. The simulation result indicates that the designed RHDA reduces the impact force significantly and improves the lock-up reliability effectively. 相似文献
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针对2012年5月21日某低轨卫星受到月影干扰导致控制系统工作异常的问题,分析了月影现象产生原理,结合月影期间影响卫星安全的异常原因,系统分析了卫星平台能源预警机制与驱动控制系统中的太阳帆板控制方案,提出了某型号低轨卫星应对月影现象安全运行的处置方法和后续同类型卫星能源管理修改建议.该方法分别在2012年11月9日、2013年5月10日得到应用,在月影期,该卫星太阳阵输出电流从4.5A下降到2A,太阳帆板对日转动正常,能源管理系统未出现报警.应用结果说明,该方法能够有效地解决同类型卫星月影干扰的问题. 相似文献
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采用形状函数法描述变形镜校正时的曲面,从适配误差、Strehl比、加工工艺性三个方面比较了4种不同单元排列方式的微变形镜。结果表明方形排列的微变形镜设计简单,需驱动电压较低,但波前校正性能较差;圆形微变形镜性能最优,但设计复杂,需驱动电压最高。 相似文献
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Power processing units (PPUs) in an electric propulsion system provide many challenging integration issues. The PPU must provide power to the electric thruster while maintaining compatibility with all of the spacecraft power and data systems. Inefficiencies in the power processor produce heat, which must be radiated to the environment in order to ensure reliable operation. Although PPU efficiencies are generally greater than 0.9, heat loads are often substantial. This heat must be rejected by thermal control systems which generally have specific masses of 15-30 kg/kW. PPUs also represent a large fraction of the electric propulsion system dry mass. Simplification or elimination of power processing in a propulsion system would reduce the electric propulsion system specific mass and improve the overall reliability and performance. A direct drive system would eliminate all or some of the power supplies required to operate a thruster by directly connecting the various thruster loads to the solar array. The development of concentrator solar arrays has enabled power bus voltages in excess of 300 V which is high enough for direct drive applications for Hall thrusters such as the Stationary Plasma Thruster (SPT). The option of solar array direct drive for SPTs is explored to provide a comparison between conventional and direct drive system mass 相似文献
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In this paper, four novel evaluation indices and corresponding hierarchical optimization strategies are proposed for a deployable solar array system considering panel flexibility and joint clearance. The deployable solar array model consists of a rigid main-body, two panels and four key mechanisms, containing torsion spring mechanism, closed cable loop mechanism, latch mechanism and attitude adjustment mechanism. Rigid and flexible components are established by Nodal Coordinate Formulation and A... 相似文献
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An electrical power system for a space-based radar satellite is described. When the radar is on, its transmitter needs an average DC power of 30 kW. The problem of distributing the power efficiently in pulses to many transmit/receive modules is addressed. System requirements include a high-voltage battery and transmission line, load-sharing between the solar array, and the battery during sunlit periods, and a 25-kW solar array. A scaled-down version of the power system for a proof-of-concept demonstration is described 相似文献
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The photovoltaic (PV) generator exhibits a nonlinear i-v characteristic and its maximum power (MP) point varies with solar insolation. In this paper, a V2-based MP point tracking (MPPT) scheme is developed using a buck-boost transformation topology. Although several buck-boost transformation topologies are available we have considered here a coupled inductor SEPIC converter for experimentation. To achieve almost ripple-free array current we have used ripple steering phenomena with the help of integrated inductor. This integrated inductor not only reduces the magnetic core requirements but also improves converter performance. Mathematical models are formulated and tracking algorithm is evolved. A combined PV system simulation model is developed in the SIMULINK. For a given solar insolation, the tracking algorithm changes the duty ratio of the converter such that the solar cell array (SCA) voltage equals the voltage corresponding to the MP point. This is done by the tracking algorithm, which mainly computes the power proportional to square of terminal voltage and changes the duty ratio of the converter so that this power is maximum. The proposed algorithm is implemented in real-time with the help of Analog Device ADMC-401 DSP evaluation module. The tracking program is developed to perform experimental investigations using analog-to-digital converter (ADC) interrupt. Using this processor we are able to track the MP within 200 ms. The proposed peak power tracking effectiveness is demonstrated through simulation and experimental results. 相似文献
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为了解决目前差速驱动车体在行进过程的跑偏问题,文章提出了将现有的差速驱动装置更换为舵轮驱动的同时,在运动控制方面引入模糊控制算法.在AGV运动规律的基础上,以法向位置误差和方位角误差为输入,舵轮转角为输出,建立了双输入单输出模糊控制系统.通过实验的分析和比较,确定了模糊控制器中的各个参数,并且利用自制的小车进行了相关的运动学实验,验证了控制系统以及所建立模型的正确性,为进一步研究激光导引AGV小车打下了理论和实验基础.实验结果表明,AGV控制系统运行平稳,性能良好,最大行使速度可达40m/min,导航精度可达±10mm,停车精度可达±5mm,能够连续工作24h,能够满足实际生产需要. 相似文献
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A direct drive actuator (DDA) with direct drive valves (DDVs) as the control device is an ideal solution for a flight actuation system. This paper presents a novel triple-redundant voice coil motor (TRVCM) used for redundant DDVs. The TRVCM features electrical/mechanical hybrid triple-redundancy by securing three stators along with three moving coils in the same frame. A permanent magnet (PM) Halbach array is employed in each redundant VCM to simplify the system structure. A back-to-back design between neighborly redundancies is adopted to decouple the magnetic flux linkage. The particle swarm optimization (PSO) method is implemented to optimize design parameters based on the analytical magnetic circuit model. The optimization objective function is defined as the acceleration capacity of the motor to achieve high dynamic performance. The optimal geometric parameters are verified with 3D magnetic field finite element analysis (FEA). A research prototype has been developed for experimental purpose. The experimental results of magnetic field density and force output show that the proposed TRVCM has great potential of applications in DDA systems. 相似文献