共查询到18条相似文献,搜索用时 171 毫秒
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介绍了机载精确投放翼伞系统的组成和工作过程。针对传统翼伞系统的不足,提出了利用GPS的精确投放翼伞GNC系统设计方案。对RGPS在精确投放翼伞系统导航中的应用进行了分析。研究工作对我国精确投放翼伞系统的设计有参考价值。 相似文献
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为提高星载广域红外相机的观测效率与凝视成像质量,扫描镜需要在几十毫秒的时间内完成角度切换,实现角秒级的轨迹跟踪控制。在闭环带宽有限的情况下,性能指标难以通过基于经典控制理论的算法实现。针对枢轴支撑的扫描镜机构,提出了一种基于迭代学习的高阶系统轨迹跟踪控制方法,推导了迭代学习律,并通过预测型算法对学习律进行了优化,避免了误差高阶导数的计算。然后通过频域分析说明了算法收敛性,选取了关键参数。通过仿真与原理样机实测验证了其应用效果。测试结果表明,算法在闭环带宽低于2 Hz的情况下,无需辨识被控对象的高阶特性,即可实现扫描镜对角加加速度超过106 (°)/s3轨迹的高精度跟踪控制,跟踪误差优于±1.5",满足相机应用要求。 相似文献
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以半捷联寻的制导武器为对象,研究了捷联末制导系统中的捷联控制算法和制导信息滤波模型。首先分析了捷联末制导系统的工作原理,给出了捷联天线稳定平台的跟踪控制算法,然后针对捷联控制算法对目标视线角信息的需求,考虑仅有角度测量的被动制导情况,提出了一种基于M arkov随机模型的机动目标跟踪模型,通过推广Kalm an滤波技术可以获得目标视线角的估计。因为捷联末制导系统无法直接测量目标视线角速度,为了满足弹上比例导引的需要,提出了一个末制导系统角跟踪通道的数学模型,该模型可以采用常规的Kalm an滤波算法获得目标视线角速度的估计值。最后,通过一系列数学仿真验证了上述方法的有效性。 相似文献
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S. Fuchshumer Dipl.-Ing. K. Schlacher O. Univ.-Prof. Dipl.-Ing. Dr. techn. G. Grabmair Dipl.-Ing. K. Straka Dipl.-Ing. 《e & i Elektrotechnik und Informationstechnik》2004,121(9):301-306
By virtue of the structural property of differential flatness, which allows for a finite, complete and free differential parametrization of a flat system by means of the so-called flat output, the trajectory tracking problem can be solved in a systematic way by invoking modern control theory. This paper is concerned with the flatness based trajectory tracking control of the unstable, underactuated, nonlinear mechanical system Ball on the Wheel. This system exhibiting a flat output with a clear physical interpretation was designed as an experimental setup for illustrating the potential of nonlinear control theory accompanying research and education. 相似文献
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Xi-le Wei Jiang Wang Zhao-xuan Yang 《Industrial Electronics, IEEE Transactions on》2007,54(1):208-217
The electromagnetic torque introduces ripples into the electromechanical motion system due to nonlinearities, such as uncertain changes of magnet field, load, and friction, which generate speed oscillations and deteriorate the tracking performance of servo system. Furthermore, the minimum time response and smooth trajectory tracking are cruces in servo control. In this paper, an available method is proposed to solve them by using neural networks (NNs) and a nonlinear smooth trajectory filter (STF) for the robust smoothing feedforward control of a class of general nonlinear systems. First, the online weight-tuning scheme based on Lyapunov function can guarantee the boundedness of tracking error by good performance of NNs modeling nonlinear functions. Second, a feedforward controller based on the output of nonlinear STF is designed to guarantee minimum time response and smooth trajectory tracking. Finally, as a example, the motion system can be equivalent to the two-order system under the linear closed-loop current control in view of the (d,q) mathematic model for PM synchronous motor, so that this robust smoothing control method using neutral networks can be applied into position servo control. Moreover, the validity and effectiveness of this control method are verified through simulations and experiments 相似文献
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《Mechatronics》2017
This paper deals with two nonlinear controllers based on saturation functions with varying parameters, for set-point regulation and trajectory tracking on an Underwater Vehicle. The proposed controllers combine the advantages of robust control and easy tuning in real applications. The stability of the closed-loop system with the proposed nonlinear controllers is proven by Lyapunov arguments. Experimental results for the trajectory tracking control in 2 degrees of freedom, these are the depth and yaw motion of an underwater vehicle, show the performance of the proposed control strategy. 相似文献
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针对四旋翼无人机的实际应用需求,开展轨迹跟踪控制研究。提出了一种基于快速扩展随机树(RRT)算法的Dubins航迹规划方法,同时搭建了四旋翼模型,并设计了轨迹跟踪控制方案对所提出的规划路径进行了轨迹跟踪仿真。该RRT-Dubins算法采用RRT算法对有障碍区域的无人机路径进行有效规划,然后利用Dubins路径对规划出的轨迹进行平滑处理,以形成一条无人机可飞行路径。仿真实验表明,采用所提出的轨迹规划方法及路径可以较好地规避障碍区域,且轨迹平滑更适合无人机飞行,同时验证了所提轨迹跟踪控制方案的有效性。 相似文献
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《Mechatronics》2017
In the study presented in this paper , the problem of the design and implementation of a two-axis sun tracking system was addressed by applying a set of two robotic systems, one for the automatic orientation of the photovoltaic modules and the second for providing the reference trajectory (robotic sensor). The design methodology was based on mechatronic concepts, in particular the VDI 2206 standard, according to which the system is divided into interconnected modules to be designed, validated, and integrated. This approach provides an efficient energy collection system in terms of the mechanism, instrumentation system, energy supply, and automatic trajectory tracking control. Experimental results illustrate the behavior of the proposed system, which achieves a better performance than fixed systems, as well as one-axis tracking mechanisms. 相似文献