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Self‐triggered adaptive neural control for USVs with sensor measurement sensitivity under deception attacks 欺骗攻击下具有传感器测量灵敏度的 USV 的自触发自适应神经控制
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-25 DOI: 10.1002/rob.22400
Chen Wu, Guibing Zhu, Yongchao Liu, Feng Li
This article investigates the control problem of unmanned surface vessels with sensor measurement sensitivity under deception attacks, and proposes a novel self‐triggered adaptive neural control scheme under the backstepping design framework. To solve the control design problem of unknown time‐varying gains caused by deception attacks and measurement sensitivity in kinematic and kinetic channels, the parameter adaptive and neural network technology are involved. In addition, to decrease actuator wear caused by the high‐frequency wave and sensor measurement sensitivity and reduce the computational burden caused by continuous monitoring of the triggered condition, a self‐triggered mechanism is constructed in the controller–actuator channel. Finally, a self‐triggered adaptive neural control solution is proposed, which can guarantee that all signals in the whole closed‐loop system are bounded by theoretical analysis. The effectiveness and superiority are verified by numerical simulations.
本文研究了欺骗攻击下具有传感器测量灵敏度的无人水面舰艇的控制问题,提出了一种反步进设计框架下的新型自触发自适应神经控制方案。为了解决由欺骗攻击和运动学与动力学通道测量敏感性引起的未知时变增益的控制设计问题,涉及到参数自适应和神经网络技术。此外,为了减少高频波和传感器测量灵敏度造成的执行器磨损,并减轻持续监测触发条件造成的计算负担,在控制器-执行器通道中构建了自触发机制。最后,提出了一种自触发自适应神经控制方案,通过理论分析可以保证整个闭环系统中的所有信号都是有界的。数值模拟验证了其有效性和优越性。
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引用次数: 0
Nezha‐SeaDart: A tail‐sitting fixed‐wing vertical takeoff and landing hybrid aerial underwater vehicle 哪吒-海飞镖尾坐式固定翼垂直起降混合空中水下飞行器
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-25 DOI: 10.1002/rob.22399
Yufei Jin, Zheng Zeng, Lian Lian
This paper presents the design, manufacturing and testing of a tail‐sitting vertically takeoff and landing fixed‐wing hybrid aerial underwater vehicle (HAUV) called Nezha‐SeaDart. Nezha‐SeaDart can vertically take off and land from ground and water, cruise in the air with lift generated by the wings, seamlessly cross the water–air interface and operate underwater like an autonomous underwater vehicle. Nezha‐SeaDart underwent a 10‐day field test in China's Thousand Islands Lake of Zhejiang Province, proving its ability to perform full cross‐domain missions. This research has the following contributions to the field of HAUV. (i) A working prototype of vertical takeoff and landing tail‐sitting HAUV with all basic functions verified and full mission cycle capability demonstrated in a field test. (ii) An HAUV that travels fast both in the air and underwater. (iii) An HAUV capable of autonomous and seamless water exit that does not rely on a dedicated propulsion system. (iv) A method of sizing the vehicle's wing and thrust considering aerial cruises, underwater operations, and seamless water exits.
本文介绍了一种名为 "哪吒-SeaDart "的尾坐式垂直起降固定翼混合航空水下航行器(HAUV)的设计、制造和测试。哪吒-SeaDart 可以从地面和水面垂直起降,利用机翼产生的升力在空中巡航,无缝穿越水气界面,并像自主水下航行器一样在水下运行。哪吒-海豹突击队在中国浙江省千岛湖进行了为期 10 天的实地测试,证明了其执行全面跨域任务的能力。这项研究对 HAUV 领域有以下贡献。(i) 垂直起降尾坐式 HAUV 工作原型机,其所有基本功能均得到验证,并在实地测试中展示了全任务周期能力。(ii) 可在空中和水下快速飞行的 HAUV。(iii) 不依赖专用推进系统,能够自主无缝出水的 HAUV。(iv) 一种考虑到空中巡航、水下作业和无缝出水的飞行器机翼和推力大小 的方法。
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引用次数: 0
Novel adaptive robust L1‐based controllers for teleoperation systems with uncertainties and time delays 用于具有不确定性和时间延迟的远程操纵系统的基于 L1 的新型自适应鲁棒控制器
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-25 DOI: 10.1002/rob.22396
Behnam Yazdankhoo, Mohammad Reza Ha'iri Yazdi, Farshid Najafi, Borhan Beigzadeh
Despite various proposed control schemes for uncertain bilateral teleoperation systems under time delays, optimally restricting the system's overshoot has remained an overlooked issue in this realm. For this aim, we propose two novel control architectures based on robust L1 theory, entitled position‐based adaptive L1 controller and transparent adaptive L1 controller, with the former focusing on position synchronization and the latter concerning system transparency. Since developing L1‐based controllers for nonlinear telerobotic systems encompassing uncertainty and round‐trip delays puts significant theoretical challenges forward, the main contribution of this paper lies in advancing L1 theory within the field of delayed teleoperation control. To formulate the theories, the asymptotic stability of the closed‐loop system for each controller is first proved utilizing the Lyapunov method, followed by transformation, along with the L1 performance criterion, into linear matrix inequalities. Ultimately, the control gains are attained by solving a convex optimization problem. The superiority of the designed controllers over a benchmark transparent controller for teleoperators is demonstrated via simulation. Furthermore, experimental tests on a two‐degrees‐of‐freedom nonlinear telerobotic system validate the efficient performance of the proposed controllers.
尽管针对时间延迟条件下的不确定双边远程操纵系统提出了各种控制方案,但优化限制系统超调仍是这一领域被忽视的问题。为此,我们提出了两种基于鲁棒 L1 理论的新型控制架构,即基于位置的自适应 L1 控制器和透明自适应 L1 控制器,前者侧重于位置同步,后者则涉及系统透明度。由于为包含不确定性和往返延迟的非线性远程机器人系统开发基于 L1 的控制器是一项重大的理论挑战,本文的主要贡献在于在延迟远程操作控制领域推进 L1 理论。为了阐述这些理论,首先利用 Lyapunov 方法证明了每个控制器闭环系统的渐近稳定性,然后将其与 L1 性能标准一起转化为线性矩阵不等式。最后,通过解决凸优化问题获得控制增益。通过仿真证明了所设计的控制器优于用于远程操作器的基准透明控制器。此外,在一个两自由度非线性远程机器人系统上进行的实验测试也验证了所提控制器的高效性能。
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引用次数: 0
Development of a wheeled wall‐climbing robot with an internal corner wall adaptive magnetic adhesion mechanism 开发带内角墙自适应磁力粘附机制的轮式爬壁机器人
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-23 DOI: 10.1002/rob.22402
Baoyu Wang, Peixing Li, Peibo Li, Lin Zhang, Enguang Guan, Xun Liu, Xudong Hu, Yanzheng Zhao
The wall‐climbing robot is a growing trend for robotized intelligent manufacturing of large and complex components in shipbuilding, petrochemical, and other industries, while several challenges remain to be solved, namely, low payload‐to‐weight ratio, poor surface adaptability, and ineffective traversal maneuverability, especially on noncontinuous surfaces with internal corners (non‐CSIC). This paper designs a high payload‐to‐weight ratio wheeled wall‐climbing robot which can travel non‐CSIC effectively with a payload capacity of up to 75 kg, and it can carry a maximum load of 141.5 kg on a vertical wall. By introducing a semi‐enclosed magnetic adhesion mechanism, the robot preserves a redundant magnetic adsorption ability despite the occurrence of significant gaps between localized body components and the wall surface. In addition, by ingeniously engineering a passive adaptive module into the robot, both the surface adaptability and crossability are enhanced without increasing the gap between the body and the wall, thereby ensuring the optimization of the adsorption force. Considering the payload capacity and diversity when climbing on vertical walls, inclined walls, ceilings, and internal corner transitions, control equations for internal corner transitions and comprehensive simulations of magnetic adsorption forces are performed using FEA tools. Finally, a functional prototype was developed for rigorous experimental testing, with the results confirming that the robot successfully meets the desired functionality and performance benchmarks.
爬壁机器人是造船、石化等行业大型复杂部件机器人化智能制造的发展趋势,但仍有几个难题亟待解决,即有效载荷重量比低、表面适应性差、穿越机动性差,尤其是在有内拐角的非连续表面(non-CSIC)上。本文设计了一种高载重重量比的轮式爬壁机器人,它能有效地在非 CSIC 上行走,载重量高达 75 千克,在垂直墙壁上的最大载重量为 141.5 千克。通过引入半封闭磁吸附机构,该机器人在局部机身部件与墙壁表面之间存在明显间隙的情况下,仍能保持冗余的磁吸附能力。此外,通过在机器人中巧妙地设计一个无源自适应模块,在不增加机身与墙壁之间间隙的情况下,增强了表面适应性和穿越性,从而确保了吸附力的优化。考虑到在垂直墙壁、倾斜墙壁、天花板和内部转角处攀爬时的有效载荷容量和多样性,利用有限元分析工具对内部转角处的控制方程和磁吸附力进行了全面模拟。最后,还开发了一个功能原型进行严格的实验测试,结果证实该机器人成功地达到了预期的功能和性能基准。
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引用次数: 0
A vision transformer‐based robotic perception for early tea chrysanthemum flower counting in field environments 基于视觉变换器的机器人感知技术,用于田间环境中的早茶菊花计数
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-19 DOI: 10.1002/rob.22398
Chao Qi, Kunjie Chen, Junfeng Gao
The current mainstream approaches for plant organ counting are based on convolutional neural networks (CNNs), which have a solid local feature extraction capability. However, CNNs inherently have difficulties for robust global feature extraction due to limited receptive fields. Visual transformer (ViT) provides a new opportunity to complement CNNs' capability, and it can easily model global context. In this context, we propose a deep learning network based on a convolution‐free ViT backbone (tea chrysanthemum‐visual transformer [TC‐ViT]) to achieve the accurate and real‐time counting of TCs at their early flowering stage under unstructured environments. First, all cropped fixed‐size original image patches are linearly projected into a one‐dimensional vector sequence and fed into a progressive multiscale ViT backbone to capture multiple scaled feature sequences. Subsequently, the obtained feature sequences are reshaped into two‐dimensional image features and using a multiscale perceptual field module as a regression head to detect the overall scale and density variance. The resulting model was tested on 400 field images in the collected TC test data set, showing that the proposed TC‐ViT achieved the mean absolute error and mean square error of 12.32 and 15.06, with the inference speed of 27.36 FPS (512 × 512 image size) under the NVIDIA Tesla V100 GPU environment. It is also shown that light variation had the greatest effect on TC counting, whereas blurring had the least effect. This proposed method enables accurate counting for high‐density and occlusion objects in field environments and this perception system could be deployed in a robotic platform for selective harvesting and flower phenotyping.
目前用于植物器官计数的主流方法是基于卷积神经网络(CNN),这种网络具有强大的局部特征提取能力。然而,由于感受野有限,卷积神经网络难以进行稳健的全局特征提取。视觉变换器(Visual transformer,ViT)为补充 CNN 的能力提供了一个新的机会,它可以轻松地建立全局上下文模型。在此背景下,我们提出了一种基于无卷积 ViT 主干网的深度学习网络(茶菊-视觉转换器 [TC-ViT]),以实现在非结构化环境下对处于初花期的茶菊进行准确、实时的计数。首先,将所有经裁剪的固定大小原始图像片段线性投影成一维向量序列,并输入渐进式多尺度 ViT 主干网,以捕获多个缩放特征序列。随后,将获得的特征序列重塑为二维图像特征,并使用多尺度感知场模块作为回归头来检测整体尺度和密度方差。在收集到的 TC 测试数据集中的 400 幅实地图像上测试了所得到的模型,结果表明,在 NVIDIA Tesla V100 GPU 环境下,所提出的 TC-ViT 的平均绝对误差和均方误差分别为 12.32 和 15.06,推理速度为 27.36 FPS(512 × 512 图像大小)。研究还表明,光线变化对 TC 计数的影响最大,而模糊对 TC 计数的影响最小。所提出的这一方法可在田野环境中对高密度和遮挡物体进行精确计数,这种感知系统可部署在机器人平台上,用于选择性收获和花卉表型分析。
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引用次数: 0
Dynamics identification‐driven diving control for unmanned underwater vehicles 无人潜航器的动态识别驱动潜水控制
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-19 DOI: 10.1002/rob.22401
Yiming Zhong, Caoyang Yu, Xianbo Xiang, Lian Lian
This paper presents a comprehensive study of dynamics identification‐driven diving control for unmanned underwater vehicles (UUVs). Initially, a diving dynamics model of UUVs is established, serving as the foundation for the development of subsequent algorithms. A noise‐reduction least squares (NRLS) algorithm is then derived for parameter identification, demonstrating convergence under measurement noise from a probabilistic perspective. A notable feature of this algorithm is its skill in correcting raw data, thereby improving parameter identification accuracy. Based on the identified model, an improved fast terminal sliding mode control (FTSMC) algorithm is introduced for diving control, consistently ensuring rapid convergence under 16 scenarios. Importantly, the proposed diving control algorithm effectively mitigates chattering by incorporating a dedicated filter, adaptively adjusting the switching gain, and substituting saturation function for sign function. Through experimental validation, the NRLS algorithm's advantage over the traditional least squares method becomes evident, with depth errors consistently below 3.5 cm. This indicates that the identified model closely aligns with the actual model, showcasing a commendable fit. Additionally, when compared to the traditional sliding mode controller and the proportional‐integral‐derivative algorithm, the FTSMC algorithm has superior performance, as indicated by a mean absolute percentage error consistently below 4%.
本文对无人潜航器(UUV)的动力学识别驱动潜水控制进行了全面研究。首先,本文建立了 UUV 的潜水动力学模型,为后续算法的开发奠定了基础。然后推导出一种用于参数识别的降噪最小二乘法(NRLS)算法,从概率角度证明了在测量噪声下的收敛性。该算法的一个显著特点是能够修正原始数据,从而提高参数识别的准确性。在识别模型的基础上,为潜水控制引入了改进的快速终端滑模控制(FTSMC)算法,在 16 种情况下始终确保快速收敛。重要的是,所提出的下潜控制算法通过加入专用滤波器、自适应调整开关增益以及用符号函数代替饱和函数,有效地缓解了颤振。通过实验验证,NRLS 算法与传统最小二乘法相比优势明显,深度误差始终低于 3.5 厘米。这表明识别出的模型与实际模型非常吻合,显示出值得称赞的拟合度。此外,与传统的滑动模式控制器和比例-积分-派生算法相比,FTSMC 算法的平均绝对百分比误差始终低于 4%,这表明该算法具有更优越的性能。
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引用次数: 0
A differentiable dynamic modeling approach to integrated motion planning and actuator physical design for mobile manipulators 移动机械手综合运动规划和致动器物理设计的可变动态建模方法
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-19 DOI: 10.1002/rob.22394
Zehui Lu, Yebin Wang
This paper investigates the differentiable dynamic modeling of mobile manipulators to facilitate efficient motion planning and physical design of actuators, where the actuator design is parameterized by physically meaningful motor geometry parameters. The proposed differentiable modeling comprises two major components. First, the dynamic model of the mobile manipulator is derived, which differs from the state‐of‐the‐art in two aspects: (1) the model parameters, including magnetic flux, link mass, inertia, and center‐of‐mass, are represented as analytical functions of actuator design parameters; (2) the dynamic coupling between the base and the manipulator is captured. Second, the state and control constraints, such as maximum angular velocity and torque capacity, are established as analytical functions of actuator design parameters. This paper further showcases two typical use cases of the proposed differentiable modeling work: integrated locomotion and manipulation planning; simultaneous actuator design and motion planning. Numerical experiments demonstrate the effectiveness of differentiable modeling. That is, for motion planning, it can effectively reduce computation time as well as result in shorter task completion time and lower energy consumption, compared with an established sequential motion planning approach. Furthermore, actuator design and motion planning can be jointly optimized toward higher performance.
本文研究了移动机械手的可微分动态建模,以促进高效的运动规划和执行器的物理设计,其中执行器设计由具有物理意义的电机几何参数参数化。拟议的可微分建模包括两个主要部分。首先,推导出移动机械手的动态模型,该模型在两个方面不同于最先进的模型:(1) 模型参数,包括磁通量、链接质量、惯性和质量中心,均表示为致动器设计参数的解析函数;(2) 捕获底座和机械手之间的动态耦合。其次,将最大角速度和扭矩容量等状态和控制约束条件建立为致动器设计参数的解析函数。本文进一步展示了所提出的可微分建模工作的两个典型用例:综合运动和操纵规划;同步致动器设计和运动规划。数值实验证明了可微建模的有效性。也就是说,在运动规划方面,与已有的顺序运动规划方法相比,可微分建模能有效减少计算时间,缩短任务完成时间,降低能耗。此外,执行器设计和运动规划可以共同优化,以实现更高的性能。
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引用次数: 0
Autonomous multiple‐trolley collection system with nonholonomic robots: Design, control, and implementation 使用非自主机器人的自主多手推车收集系统:设计、控制和实施
IF 8.3 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-18 DOI: 10.1002/rob.22395
Peijia Xie, Bingyi Xia, Anjun Hu, Ziqi Zhao, Lingxiao Meng, Zhirui Sun, Xuheng Gao, Jiankun Wang, Max Q.‐H. Meng
The task of collecting and transporting luggage trolleys in airports, characterized by its complexity within dynamic public environments, presents both an ongoing challenge and a promising opportunity for automated service robots. Previous research has primarily developed on universal platforms with robot arms or focused on handling a single trolley, creating a gap in providing cost‐effective and efficient solutions for practical scenarios. In this paper, we propose a low‐cost mobile manipulation robot incorporated with an autonomy framework for the collection and transportation of multiple trolleys that can significantly enhance operational efficiency. The method involves a novel design of the mechanical system and a vision‐based control strategy. We design a lightweight manipulator and the docking mechanism, optimized for the sequential stacking and transportation of trolleys. On the basis of the Control Lyapunov Function and Control Barrier Function, we propose a vision‐based controller with online Quadratic Programming, which improves the docking accuracy. The practical application of our system is demonstrated in real‐world scenarios, where it successfully executes the multiple‐trolley collection task.
在动态的公共环境中,机场行李车的收集和运输任务十分复杂,这对自动服务机器人来说既是一个持续的挑战,也是一个充满希望的机遇。以往的研究主要是在带有机械臂的通用平台上进行开发,或者专注于处理单个手推车,这在为实际场景提供经济高效的解决方案方面造成了差距。在本文中,我们提出了一种低成本移动操纵机器人,该机器人结合了自主框架,用于收集和运输多辆手推车,可显著提高操作效率。该方法涉及新颖的机械系统设计和基于视觉的控制策略。我们设计了一种轻型机械手和对接机制,并针对小车的顺序堆叠和运输进行了优化。在控制 Lyapunov 函数和控制障碍函数的基础上,我们提出了一种基于视觉的在线二次编程控制器,从而提高了对接精度。我们的系统在实际应用中得到了验证,并成功执行了多手推车收集任务。
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引用次数: 0
A CIELAB fusion-based generative adversarial network for reliable sand–dust removal in open-pit mines 基于 CIELAB 融合的生成式对抗网络,用于露天矿可靠除砂除尘
IF 4.2 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-15 DOI: 10.1002/rob.22387
Xudong Li, Chong Liu, Yangyang Sun, Wujie Li, Jingmin Li

Intelligent electric shovels are being developed for intelligent mining in open-pit mines. Complex environment detection and target recognition based on image recognition technology are prerequisites for achieving intelligent electric shovel operation. However, there is a large amount of sand–dust in open-pit mines, which can lead to low visibility and color shift in the environment during data collection, resulting in low-quality images. The images collected for environmental perception in sand–dust environment can seriously affect the target detection and scene segmentation capabilities of intelligent electric shovels. Therefore, developing an effective image processing algorithm to solve these problems and improve the perception ability of intelligent electric shovels has become crucial. At present, methods based on deep learning have achieved good results in image dehazing, and have a certain correlation in image sand–dust removal. However, deep learning heavily relies on data sets, but existing data sets are concentrated in haze environments, with significant gaps in the data set of sand–dust images, especially in open-pit mining scenes. Another bottleneck is the limited performance associated with traditional methods when removing sand–dust from images, such as image distortion and blurring. To address the aforementioned issues, a method for generating sand–dust image data based on atmospheric physical models and CIELAB color space features is proposed. The impact mechanism of sand–dust on images was analyzed through atmospheric physical models, and the formation of sand–dust images was divided into two parts: blurring and color deviation. We studied the blurring and color deviation effect generation theories based on atmospheric physical models and CIELAB color space, and designed a two-stage sand–dust image generation method. We also constructed an open-pit mine sand–dust data set in a real mining environment. Last but not least, this article takes generative adversarial network (GAN) as the research foundation and focuses on the formation mechanism of sand–dust image effects. The CIELAB color features are fused with the discriminator of GAN as basic priors and additional constraints to improve the discrimination effect. By combining the three feature components of CIELAB color space and comparing the algorithm performance, a feature fusion scheme is determined. The results show that the proposed method can generate clear and realistic images well, which helps to improve the performance of target detection and scene segmentation tasks in heavy sand–dust open-pit mines.

目前正在开发用于露天矿智能采矿的智能电铲。基于图像识别技术的复杂环境检测和目标识别是实现智能电铲操作的先决条件。然而,露天矿中存在大量沙尘,在数据采集过程中会导致环境能见度低和颜色偏移,从而产生低质量的图像。在沙尘环境中采集的环境感知图像会严重影响智能电铲的目标检测和场景分割能力。因此,开发一种有效的图像处理算法来解决这些问题并提高智能电铲的感知能力变得至关重要。目前,基于深度学习的方法在图像去毛刺方面取得了不错的效果,在图像去沙尘方面也有一定的相关性。然而,深度学习在很大程度上依赖于数据集,但现有的数据集主要集中在雾霾环境中,沙尘图像数据集存在很大缺口,尤其是露天采矿场景。另一个瓶颈是传统方法在去除图像中的沙尘时性能有限,如图像失真和模糊。针对上述问题,提出了一种基于大气物理模型和 CIELAB 色彩空间特征的沙尘图像数据生成方法。通过大气物理模型分析了沙尘对图像的影响机理,并将沙尘图像的形成分为模糊和色彩偏差两部分。我们研究了基于大气物理模型和 CIELAB 色彩空间的模糊和色彩偏差效应生成理论,并设计了两阶段沙尘图像生成方法。我们还在真实的采矿环境中构建了露天矿沙尘数据集。最后,本文以生成式对抗网络(GAN)为研究基础,重点研究了沙尘图像效果的形成机理。将 CIELAB 颜色特征与 GAN 的判别器融合,作为基本前提和附加约束,以提高判别效果。通过结合 CIELAB 色彩空间的三个特征成分并比较算法性能,确定了特征融合方案。结果表明,所提出的方法能很好地生成清晰逼真的图像,有助于提高重沙尘露天矿中目标检测和场景分割任务的性能。
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引用次数: 0
ANN-PID based automatic braking control system for small agricultural tractors 基于 ANN-PID 的小型农用拖拉机自动制动控制系统
IF 4.2 2区 计算机科学 Q2 ROBOTICS Pub Date : 2024-07-11 DOI: 10.1002/rob.22393
Nrusingh Charan Pradhan, Pramod Kumar Sahoo, Dilip Kumar Kushwaha, Dattatray G. Bhalekar, Indra Mani, Kishan Kumar, Avesh Kumar Singh, Mohit Kumar, Yash Makwana, Soumya Krishnan V., Aruna T. N.
<p>Braking system is a crucial component of tractors as it ensures safe operation and control of the vehicle. The limited space availability in the workspace of a small tractor exposes the operator to undesirable posture and a maximum level of vibration during operation. The primary cause of road accidents, particularly collisions, is attributed to the tractor operator's insufficient capacity to provide the necessary pedal power for engaging the brake pedal. During the process of engaging the brake pedal, the operator adjusts the backrest support to facilitate access to the brake pedal while operating under stressed conditions. In the present study, a linear actuator-assisted automatic braking system was developed for the small tractors. An integrated artificial neural network proportional–integral–derivative (ANN-PID) controller-based algorithm was developed to control the position of the brake pedal based on the input parameters like terrain condition, obstacle distance, and forward speed of the tractor. The tractor was operated at four different speeds (i.e., 10, 15, 20, and 25 km/h) in different terrain conditions (i.e., dry compacted soil, tilled soil, and asphalt road). The performance parameters like sensor digital output (SDO), force applied on the brake pedal (<span></span><math> <semantics> <mrow> <mrow> <msub> <mi>F</mi> <mi>b</mi> </msub> </mrow> </mrow> <annotation> <math altimg="urn:x-wiley:15564959:media:rob22393:rob22393-math-0001" wiley:location="equation/rob22393-math-0001.png" display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mrow><msub><mi>F</mi><mi>b</mi></msub></mrow></mrow></math></annotation> </semantics></math>), and deceleration were considered as dependent parameters. The SDO was found to good approximation for sensing the position of the brake pedal during braking. The optimized network topology of the developed multilayer perceptron neural network (MLPNN) was 3-6-2 for predicting SDO and deceleration of the tractor with a coefficient of determination (<span></span><math> <semantics> <mrow> <mrow> <msup> <mi>R</mi> <mn>2</mn> </msup> </mrow> </mrow> <annotation> <math altimg="urn:x-wiley:15564959:media:rob22393:rob22393-math-0002" wiley:location="equation/rob22393-math-0002.png" display="inline" xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mrow><msup><mi>R</mi><mn>2</mn></msup></mrow></mrow></math><
制动系统是拖拉机的重要组成部分,因为它能确保车辆的安全操作和控制。由于小型拖拉机的工作空间有限,操作员在操作过程中很难保持良好的姿势和最大程度的振动。道路交通事故,特别是碰撞事故的主要原因是拖拉机驾驶员没有足够的能力提供必要的踩踏制动踏板的力量。在踩下制动踏板的过程中,操作员会调整靠背支撑,以方便在压力条件下踩下制动踏板。本研究为小型拖拉机开发了线性执行器辅助自动制动系统。根据地形条件、障碍物距离和拖拉机前进速度等输入参数,开发了一种基于集成人工神经网络比例-积分-派生(ANN-PID)控制器的算法来控制制动踏板的位置。拖拉机以四种不同的速度(即 10、15、20 和 25 公里/小时)在不同的地形条件(即干燥压实土壤、耕作土壤和沥青路面)下运行。传感器数字输出(SDO)、施加在制动踏板上的力量()和减速度等性能参数被视为从属参数。结果表明,SDO 可以很好地近似感知制动过程中制动踏板的位置。所开发的多层感知器神经网络(MLPNN)的优化网络拓扑结构为 3-6-2,用于预测拖拉机的 SDO 和减速度,SDO 和减速度的训练数据集和测试数据集的决定系数()分别为 0.9953 和 0.9854,以及 0.9254 和 0.9096。采用齐格勒-尼科尔斯法(Z-N 法)确定了 PID 控制器的初始最佳增益,随后使用响应面法对这些系数进行了优化。优化后的比例()、积分()和导数()系数值分别为 4.8、6.782 和 3.15。所开发的集成 ANN(即基于 MLPNN 和 PID 的算法)可成功控制制动时制动踏板的位置。在所有选定的地形条件下,随着拖拉机前进速度从 10 km/h 增加到 25 km/h,拖拉机在自动制动时的制动距离和滑移量都有所增加。
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Journal of Field Robotics
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