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1. 北京理工大学 机械与车辆学院, 北京 100081
2. 中国北方车辆研究所, 北京 100072
Received:09 November 2021,
Published Online:10 March 2023,
Published:28 February 2023
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Xiaotian ZHOU, Hongbin REN, Bo SU, et al. Hierarchical Trajectory Planning Algorithm based on Differential Flatness[J]. Acta Armamentarii, 2023, 44(2): 394-405.
Xiaotian ZHOU, Hongbin REN, Bo SU, et al. Hierarchical Trajectory Planning Algorithm based on Differential Flatness[J]. Acta Armamentarii, 2023, 44(2): 394-405. DOI: 10.12382/bgxb.2021.0756.
为充分考虑横纵向耦合和汽车运动学特性对轨迹规划的影响
提出一种分层优化的轨迹规划算法框架。利用贝塞尔曲线的凸包性设计安全走廊约束
以轨迹平滑性为目标函数得到一个基于贝塞尔曲线节点的下层规划器。在上层规划器中
基于下层规划器求解得到的横纵向贝塞尔曲线和车辆运动学模型的微分平坦输出进行三维耦合
构建满足车辆乘坐舒适性、高效性和安全性的目标函数
利用粒子群优化算法对贝塞尔轨迹初始参数进行二次优化得到综合性能最优的行驶轨迹。仿真结果表明:新算法在保证安全性的同时
具有良好的乘坐舒适性和可跟踪性;由于二次规划与粒子群优化算法的求解效率高
此框架实时性强
具有概率完备性。
To fully consider the influence of transverse and longitudinal coupling and vehicle kinematics on trajectory planning
a hierarchical optimization-based trajectory planning algorithm framework is proposed. The safe corridor constraint is designed with the convex hull of a Bezier curve. Taking the trajectory smoothness as the objective function
we obtain a lower planner based on Bezier curve nodes. In the upper planner
based on the transverse and longitudinal Bezier curves solved by the lower planner and the differentially flat output of the vehicle kinematics model
the objective function meeting the vehicle ride comfort
efficiency and safety requirements is constructed
and quadratic optimization is applied to the initial parameters of the Bezier trajectory by particle swarm optimization algorithm to obtain the driving trajectory with the best comprehensive performance. The simulation results show that: the algorithm has good ride comfort and traceability while ensuring safety; due to the high efficiency of quadratic programming and particle swarm optimization
this framework has strong real-time and probabilistic completeness.
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LIN X K , LIN J N , SU Z Y , et al. Research on key technologies of power internet of things based on artificial intelligence technology [J ] . IOP Conference Series:Earth and Environmental Science , 2021 , 714 ( 4 ): 042067 . DOI: 10.1088/1755-1315/714/4/042067 http://doi.org/10.1088/1755-1315/714/4/042067 With the development of science and technology, the power industry has combined many new technologies driven by science and technology to improve its own operating quality. The Internet of Things is a new technology that can significantly improve the power system. This article aims to study the key technologies of power Internet of Things based on artificial intelligence technology. This paper takes the research of intelligent meter reading system as an example, and conducts experimental analysis based on artificial intelligence algorithms. Using artificial algorithms in the spider web network topology, as the network increases, the communication paths that can be selected between nodes also increase, and the full-end reliability of the network topology also increases. The collection node is responsible for collecting temperature and voltage values through artificial intelligence technology, and then transmits the collected values to the coordinator node responsible for collecting information, and sends the collected information to the PC through the serial port, and uses the serial port debugging tool to display collected data. Experimental data shows that signal attenuation gradually increases with distance, and distance and obstacles make it impossible to send data accurately. So you can add routing nodes to the network, add collectors and concentrators, and then add an enhanced RF (Radio Frequency Identification) generator to the antenna design. The experimental results show that in the case of two indoor walls and D≤20m, the signal strength is in the range of -82dBm to -94dBm, which can ensure the normal communication of data. If D≥25m, data communication cannot be guaranteed. By combining power and the Internet of Things, power-based Internet of Things can be built to comprehensively enhance power operations.
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SHIM T , ADIREDDY G , YUAN H L . Autonomous vehicle collision avoidance system using path planning and model-predictive-control-based active front steering and wheel torque control [J ] . Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering , 2012 , 226 ( 6 ): 767 - 778 . DOI: 10.1177/0954407011430275 http://doi.org/10.1177/0954407011430275 http://journals.sagepub.com/doi/10.1177/0954407011430275 http://journals.sagepub.com/doi/10.1177/0954407011430275 Autonomous vehicles have attracted more attention in recent years as vehicle applications are evolving to a more intelligent and autonomous stage. This paper presents the development of a collision avoidance system for an autonomous vehicle application which consists of a motion planner and model-predictive-control-based active vehicle steering and active wheel torque control. A motion planner, based on polynomial parameterization, determines a collision-free trajectory when a vehicle collision with obstacles is likely to happen. Then an MPC-based control system controls the front steering and individual wheel torques to track the desired collision-free reference trajectory. The proposed system is evaluated through simulation, using an eight-degrees-of-freedom vehicle model with a ‘magic formula’ tire model, active front steering, and active wheel torque distribution systems. The simulation results show that it effectively performs collision avoidance maneuvers.
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赵新 , 纪永祥 , 罗熙斌 , 等 . 基于改进粒子群优化算法的近炸引信最佳炸高计算方法 [J ] . 兵工学报 , 2021 , 42 ( 5 ): 924 - 929 .
ZHAO X , JI Y X , LUO X B , et al. Computation method for the optimal burst height of proximity fuze based on improved particle swarm optimization algorithm [J ] . Acta Armamentarii , 2021 , 42 ( 5 ): 924 - 929 . (in Chinese) DOI: 10.3969/j.issn.1000-1093.2021.05.004 http://doi.org/10.3969/j.issn.1000-1093.2021.05.004 The timely detonation of warhead with proximity fuze is related to whether it can effectively attack and destroy a target. The optimal coordination relationship of fuze and warhead is proposed. A mathematical model of warhead power is established. The relationship between related parameters is analyzed using the particle swarm optimization algorithm, and the inertia weight is dynamically updated using the Euler distance method. An improved particle swarm optimization algorithm was presented and applied to the mathematical model to obtain the calculation model of warhead power in fuze-warhead coordination. Through simulation experiments, the relationship among lethal area, burst height and falling angle was obtained, the best power conditions for fuze-warfare coordination were determined, and the maximum lethal area, the corresponding interval of 90% lethal area and the corresponding burst height were calculated. The results show that the proposed method has higher calculation accuracy of the maximum lethal area than the traditional method, and has faster convergence speed than the particle swarm optimization algorithm, which can better meet the speed calculation requirements for the range test and tactical fied firing.
杜广泽 , 张旭东 , 邹渊 , 等 . 非结构道路场景下轮式无人车辆避障算法 [J ] . 兵工学报 , 2020 , 41 ( 10 ): 2096 - 2105 . DOI: 10.3969/j.issn.1000-1093.2020.10.020 http://doi.org/10.3969/j.issn.1000-1093.2020.10.020 针对非结构化道路下轮式无人车辆的避障问题,提出一种基于模型预测控制的避障算法。在没有离线地图和参考轨迹的非结构化场景下,通过优化方法直接获得车辆运动的轨迹、前轮转角与参考纵向加速度,同时满足车辆运动约束与避障功能。利用车辆感知信息,根据非结构化道路场景将避障问题划分为分段最优控制问题;明确最优控制问题各段的车辆约束与评价指标,并将约束转换为与车辆横纵向控制相关的形式,进而对最优控制问题进行求解。实车测试结果表明,该算法在非结构道路中实现了轨迹规划,规划结果满足车辆约束并使得车辆实现避障。
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