Path-planning research has been the key to mobile-robot-navigation technology. However, traditional path-planning algorithms have some shortcomings. To solve these problems, this paper proposes a fusion algorithm that combines the kinematical constrained A* algorithm with the Dynamic Window Approach (DWA) algorithm. The kinematical constrained A* algorithm can plan the global path, and then the DWA algorithm can plan the local path under the global path’s guidance. Firstly, combined with robot kinematics, we improve the node-expansion method and heuristic-function model of the A* algorithm, which improves the search efficiency, reduces the number of path bends and lowers the computational cost so that the path generated by the A* algorithm better meets the needs of robot motion. Secondly, we optimize the trajectory-evaluation function of the DWA algorithm so that the local paths planned by the DWA algorithm are smoother and more coherent, which is easier for robot-motion execution. Finally, we extract the key nodes from the global path planned by the A* algorithm to guide the DWA algorithm for local path planning and dynamic-obstacle avoidance and to make the local path closer to the global path. Through simulation and practical experiments, the effectiveness of the fusion algorithm proposed in this paper is verified.

In this paper, we propose a localization method applicable to 3D LiDAR by improving the LiDAR localization algorithm, such as AMCL (Adaptive Monte Carlo Localization). The method utilizes multiple sensing information, including 3D LiDAR, IMU and the odometer, and can be used without GNSS. Firstly, the wheel speed odometer and IMU data of the mobile robot are multi-source fused by EKF (Extended Kalman Filter), and the sensor data obtained after multi-source fusion are used as the motion model to participate in the positional prediction of the particle set in AMCL to obtain the initial positioning information of the mobile robot. Then, the position pose difference values output by AMCL at adjacent moments are substituted into the PL-ICP algorithm as the initial position pose transformation matrix, and the 3D laser point cloud is aligned with the nonlinear system using the PL-ICP algorithm. The three-dimensional laser odometer is obtained by LM (Levenberg--Marquard) iterative solution in the PL-ICP algorithm. Finally, the initial position pose output by AMCL is corrected by the three-dimensional laser odometer, and the AMCL particles are weighted and sampled to output the final positioning result of the mobile robot. Through simulation and practical experiments, it is verified that the improved AMCL algorithm has higher positioning accuracy and stability compared to the AMCL algorithm.

Two-wheeled mobile robots with deformed wheels face low stability when climbing steps, and their success rate in overcoming steps is affected by the trajectory. To address these challenges, we propose an improved hybrid genetic and adaptive particle swarm optimization (HGAPSO) algorithm to optimize the deformed wheels’ trajectory for overcoming steps. HGAPSO optimizes the maximum and minimum values of the inertial weight and learning factors of the adaptive particle swarm algorithm utilizing the region-wide search capabilities of the genetic algorithm, which substantially improves the convergence speed and adaptability. Furthermore, the analysis of the motion of the deformed wheel overcoming the steps and the examination of the potential interference during the operation are used to construct a wheel’s center-of-mass route based on fifth-order Bézier curves. Comparative simulation experiments of the trajectories optimized using different optimization algorithms under the same working conditions are designed to demonstrate the efficacy of the proposed HGAPSO algorithm in optimizing the trajectory of the deformed wheel overcoming the step. Simulation experiments were conducted using the HGAPSO algorithm to optimize the trajectories of deformation wheels for overcoming steps of various sizes. These optimized trajectories were then compared to unoptimized ones. The results showed that the HGAPSO-optimized trajectories significantly improved the success rate and stability of the mobile robot in overcoming steps.

When there are dynamic obstacles in the environment, it is difficult for traditional path-generation algorithms to achieve desired obstacle-avoidance results. To solve this problem, we propose a robot navigation control method based on SAC (Soft Actor-Critic) Deep Reinforcement Learning. Firstly, we use a fast path-generation algorithm to control the robot to generate expert trajectories when the robot encounters danger as well as when it approaches a target, and we combine SAC reinforcement learning with imitation learning based on expert trajectories to improve the safety of training. Then, for the hybrid data consisting of agent data and expert data, we use an improved prioritized experience replay method to improve the learning efficiency of the policies. Finally, we introduce RNN (Recurrent Neural Network) units into the network structure of the SAC Deep Reinforcement-Learning navigation policy to improve the agent’s transfer inference ability in a new environment and obstacle-avoidance ability in dynamic environments. Through simulation and practical experiments, it is fully verified that our method has a higher training efficiency and navigation success rate compared to state-of-the-art reinforcement-learning algorithms, which further enhances the obstacle-avoidance capability of the robot system.

Real-time dense 3D reconstruction is one of the major challenges in computer vision and robotics. In this paper, we propose a real-time 3D reconstruction model with metric-scale, including a direct visual-inertial odometry with stereo cameras and a deep multi-view stereo network. Aiming at the scale uncertainty of dense map constructed by monocular camera, we designed a direct stereo visual-inertial odometry(DSVIO). The odometry combines static stereo optimization with direct visual-inertial odometry, using left-right images to initialize the depth of feature points, which can significantly improve the accuracy of 6-DoF(Degree of Freedom) pose and metric-scale in the active window. In the aspect of depth estimation, the minimizing photometric re-projection loss(MPRP) proposed by us can integrate the common view-points for depth estimation under different view to improve the performance of CVA-MVSNet. Finally, the predicted depth map is fused into the truncated signed distance function (TSDF) voxel volume. The experiment shows that the pose estimation of our visual odometer has state-of-the-art(SOTA) performance when the trajectory is smooth and low jitter. In the case of fast jitter, our method is still superior to the monocular visual-internal odometry of ORB-SLAM3, but slightly inferior to the stereo visual-internal odometry of ORB-SLAM3.In the experiment of depth estimation, MPRP effectively improves the performance of CVA-MVSNet, and all evaluation indicators were superior to the original method. Moreover, our method had good performance in real-time 3D reconstruction with metric-scale.

Wheeled mobile robots are efficient on flat surfaces but face limitations in overcoming obstacles like steps due to their fixed wheel radius. This paper presents a novel modular reconfigurable wheel with a dual-degree-of-freedom active reconfigurable mechanism, designed to adapt dynamically to varying step sizes. The wheel’s structure includes three curved segments, whose synchronized motion is driven by five-bar linkages and two planetary gear systems. By analyzing the kinematic constraints and both forward and inverse kinematics of the reconfigurable wheel, we established the range of dimensions it can surmount over steps, specifically focusing on height and depth, as well as the relationship with the output angles \(q_1\) and \(q_2\) of the two motors driving the reconfiguration. Simulations using ADAMS software demonstrates the wheel’s capability to maintain smooth, continuous center-of-mass movement over steps and stairs. Moreover, physical prototype testing further confirms the feasibility and advantages of the proposed wheel structure. This adaptive design significantly enhances the performance of wheeled robots in navigating complex environments, offering promising potential for applications in challenging terrain.