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2020 20th International Conference on Control, Automation and Systems (ICCAS)最新文献

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Constructing ROS Package for Legged Robot in Gazebo Simulation from Scratch 从零开始构建凉亭仿真中腿式机器人的ROS包
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268358
C. Yeoh, D. Kim, Y. B. Won, S. R. Lee, H. Yi
Robot Operating System, (ROS) is one of the open-source, meta-operating system, which is now widely used as the robotic software platform and can be applicable for anyone who wanted to build their robot from scratch. For the credit of the beneficial of ROS, the work of this paper describes all the process and structure of the package construction for the legged robot simulation in Gazebo. There are five mains folders consisted in the package, which are configuration file (config), launch file (launch), meshes folder (meshes), script folder (script), Universal robot definition format folder (urdf), and worlds folder (worlds). In this research, Pseudo-inverse Jacobian was implemented to obtain the optimal angular joint for every step walking during the simulation. Result of the walking robot simulation are shown to have the least error range around 0.0365 m to 0.0867 m differ from the actual target position.
机器人操作系统(ROS)是一种开源的元操作系统,它现在被广泛用作机器人软件平台,可以适用于任何想从头开始构建机器人的人。为了充分利用ROS的优势,本文描述了在Gazebo中进行腿式机器人仿真包构建的全部过程和结构。包中包含五个主要文件夹,分别是配置文件(config)、启动文件(launch)、网格文件夹(meshes)、脚本文件夹(script)、通用机器人定义格式文件夹(urdf)和世界文件夹(worlds)。在仿真过程中,利用伪逆雅可比矩阵求解机器人每步行走的最优角关节。仿真结果表明,步行机器人与实际目标位置的误差最小,误差范围在0.0365 ~ 0.0867 m之间。
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引用次数: 2
Performance Indicator Survey for Object Detection 目标检测性能指标调查
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268228
In-Deok Park, Sungho Kim
In recent image processing, beyond the object recognition problem, deep learning has been used in various aspects such as object detection, semantic segmentation. In addition, classic technique-based detection has been performed variously. These technologies are applied in various systems such as factory automation systems, automatic target recognition (ATR) systems, autonomous driving systems, etc. Object detection is performed in various categories such as people, vehicles and animals, etc. And it is operated for various situations which contain different object size, image size, distance range from near to remote, changeable environment, etc. For the situation analysis, indicators need to be used appropriately. And when researchers make some algorithm for object detection, if there are no any evaluation indicators, the algorithm can’t be demonstrated. So, it is important to know about performance indicators of object detection. Various indicators are used in object detection. As a result, this paper introduces performance indicators of object detection. The main purpose of the survey is that researchers find the proper performance indicator for object detection. And It can help to compare the detection result with a different algorithm result, exactly and effectively.
在最近的图像处理中,除了物体识别问题之外,深度学习还被应用于物体检测、语义分割等各个方面。此外,经典的基于技术的检测已经进行了各种。这些技术应用于各种系统,如工厂自动化系统,自动目标识别(ATR)系统,自动驾驶系统等。对象检测是针对人、车辆、动物等不同类别进行的。适用于不同物体大小、图像大小、远近距离、多变环境等多种情况。在进行形势分析时,需要适当使用指标。而当研究人员做出某种目标检测算法时,如果没有任何评价指标,则无法对算法进行论证。因此,了解目标检测的性能指标是非常重要的。在目标检测中使用各种指标。因此,本文介绍了目标检测的性能指标。调查的主要目的是研究人员找到合适的目标检测性能指标。并且可以准确有效地将检测结果与不同算法的检测结果进行比较。
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引用次数: 4
Recurrent Neural Network to Estimate Intake Manifold O2 Concentration in a Diesel Engine 递归神经网络估算柴油机进气歧管氧浓度
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268307
L. Ventura, S. Malan
Emission regulations are becoming more and more stringent, especially on NOx pollutants, making diesel engines with their embedded control systems more and more complex. To ensure a correct and clean engine functioning, all the control strategies related to aftertreatment, fuel injection and air-path have to exploit or target the intake manifold O2 concentration. The O2 concentration is strictly related to engine-out NOx emissions and an accurate model, to be implemented in emission control systems, is essential. The paper addresses the modeling of the intake O2 concentration in a turbocharged diesel engine by means of a Recurrent Neural Network with simulation focus and fed with four inputs. The inputs are engine load, engine speed and the position of Exhaust Gas Recirculation and Variable Geometry Turbochargers valves. Training and validation data are generated using the engine simulation tool GT-Power implementing a detailed model of the engine while the training procedure is performed in MATLAB environment through NNSYSID toolbox. The performances of the obtained model are satisfactory in different tests and the model is able to account for the engine nonlinearities during transients.
排放法规越来越严格,特别是对氮氧化物污染物的排放,使得柴油机及其嵌入式控制系统变得越来越复杂。为了确保发动机正常、清洁地工作,所有与后处理、燃油喷射和空气路径相关的控制策略都必须利用或以进气歧管的O2浓度为目标。O2浓度与发动机排出的NOx排放量密切相关,因此在排放控制系统中实施精确的模型至关重要。本文采用具有仿真焦点和四输入的递归神经网络对增压柴油机进气氧气浓度进行建模。输入是发动机负荷、发动机转速以及废气再循环和可变几何涡轮增压器阀门的位置。使用发动机仿真工具GT-Power实现发动机的详细模型生成训练和验证数据,通过NNSYSID工具箱在MATLAB环境下执行训练过程。所建立的模型在不同的试验中表现出令人满意的性能,能很好地解释发动机瞬态非线性。
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引用次数: 1
Outdoor Monocular Visual Odometry Enhancement Using Depth Map and Semantic Segmentation 基于深度图和语义分割的室外单目视觉里程增强
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268347
Jee-seong Kim, Chul-hong Kim, Yong-Min Shin, Ilsoo Cho, D. Cho
An outdoor environment is challenging for the localization of a mobile robot. For robust visual odometry, accurate feature matching and triangulation are essential. The features extracted from the windows of buildings and car surfaces lead to wrong triangulation results due to reflective features. The landmarks at short-distances affect the feature matching performance and the landmarks at long-distances cause triangulation errors. Inaccurate feature matching and triangulation error lead to the localization error of the robot pose. In this paper, an outdoor monocular visual odometry using the pre-trained depth estimation network and semantic segmentation network is proposed. By using the pre-trained semantic segmentation network, a semantic label is predicted for every pixel. Also, by using the pre-trained depth map estimation network, the depth of every pixel is predicted. Using semantic constraints for feature matching and depth constraint for triangulation, the accuracy of these procedures is enhanced. Additionally, pose graph optimization is performed on every estimated robot pose and landmark position. The performance of the proposed method is evaluated using dataset-based experiments. The experiments showed that the proposed algorithm is more accurate than the visual odometry algorithm that uses Oriented FAST and rotated BRIEF (ORB) features.
户外环境对移动机器人的定位具有挑战性。对于稳健的视觉里程计,精确的特征匹配和三角测量是必不可少的。从建筑物窗户和汽车表面提取的特征由于反射特征导致三角剖分结果错误。距离较近的特征点影响特征匹配性能,距离较远的特征点导致三角测量误差。特征匹配不准确和三角测量误差导致机器人姿态定位误差。本文提出了一种基于预训练深度估计网络和语义分割网络的室外单目视觉里程测量方法。利用预训练的语义分割网络,对每个像素预测一个语义标签。利用预训练的深度图估计网络,对每个像素点的深度进行预测。利用语义约束进行特征匹配,利用深度约束进行三角剖分,提高了算法的精度。此外,对每个估计的机器人姿态和地标位置进行姿态图优化。通过基于数据集的实验对该方法的性能进行了评价。实验表明,该算法比使用定向快速和旋转简短(ORB)特征的视觉里程计算法精度更高。
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引用次数: 0
Light Control Smart Farm Monitoring System with Reflector Control 具有反射器控制的光控智能农场监控系统
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268238
Jaekuk Choi, Dongsun Lim, Sangwon Choi, Jeonghyeon Kim, Jong-Heon Kim
This paper is on the implementation of a system that monitors and controls a smart farm using Arduino and DC motors. Light control in traditional smart farms uses artificial light such as LED lights to control brightness. However, this traditional method has high maintenance cost for continuously turning on artificial light. In this paper, we develop a system to control the amount of light inflow using the angle control of the reflector. Also, we monitor environmental information such as temperature, humidity, carbon dioxide(Co2), and light value for the optimum smart farm environment. The temperature is controlled using the ventilator and heater. Also, environmental data can be uploaded to the server in real-time to check the accumulated data on a chart, and we accumulate the optimal reflector angle data for more than one year. Since solar motion repeats every year, we can control the reflector according to this accumulated data. This system has been implemented as a server and mobile application that provides various sensors for environmental control, Arduino, Wemos for Wifi server upload, and a monitoring UI.
本文介绍了一种基于Arduino和直流电机的智能农场监控系统的实现。传统智能农场的灯光控制使用LED灯等人造光来控制亮度。然而,这种传统的方法由于需要连续打开人工光源,维护成本高。在本文中,我们开发了一个系统来控制入射光的角度控制反射器。此外,我们还监测环境信息,如温度、湿度、二氧化碳(Co2)和光值,以实现最佳的智能农场环境。温度由通风机和加热器控制。同时,环境数据可以实时上传到服务器,在图表上查看累积的数据,我们积累了一年以上的最佳反射角数据。由于太阳运动每年都是重复的,我们可以根据这些累积的数据来控制反射器。该系统作为服务器和移动应用程序实现,提供各种用于环境控制的传感器,Arduino,用于Wifi服务器上传的Wemos以及监控UI。
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引用次数: 3
Effect of Measurement Noise in Disturbance Observer Based Control Systems with Two Saturation Constraints 基于扰动观测器的两饱和约束控制系统测量噪声的影响
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268273
Seyeong Cheon, Gyujin Na, Y. Eun
Disturbance Observer (DOB) is a well known tool for control systems capable of compensating model un-certainty and rejecting exogenous disturbances. It has been reported previously that zero mean measurement noise may induce tracking error in DOB based control systems with a saturation nonlinearity due to saturating actuators. In this work, DOB based control systems with two saturation constraints are considered and the effect of measurement noise is investigated. Such system architecture arises from Robust Transient DOB (RTDOB) which intentionally bounds amplitude of disturbance compensation in order to avoid peaking phenomenon that can possibly worsen transient response of the closed loop system. Systems using RTDOB have two saturation constraints, one that naturally arises from saturating actuator, and the other artificially inserted to limit the amplitude of disturbance compensation. We show that zero mean measurement noise may induce tracking error in RTDOB based systems as well, analyze the amplitude of the error with systems parameters, and discuss its severity compared to that of a regular DOB based system. The accuracy of proposed analysis is demonstrated through simulations.
扰动观测器(DOB)是一种众所周知的控制系统工具,能够补偿模型的不确定性和抑制外源干扰。以前有报道称,零平均测量噪声可能导致基于DOB的控制系统由于饱和致动器的饱和非线性而产生跟踪误差。本文研究了具有两种饱和约束的基于DOB的控制系统,并研究了测量噪声的影响。这种系统结构源于鲁棒暂态DOB (Robust Transient DOB, RTDOB),它有意地限制扰动补偿的幅度,以避免可能恶化闭环系统暂态响应的峰值现象。使用RTDOB的系统有两个饱和约束,一个是由饱和致动器自然产生的,另一个是人为插入的,以限制干扰补偿的幅度。研究表明,零平均测量噪声也会导致基于RTDOB的系统产生跟踪误差,分析了该误差随系统参数的幅值,并讨论了与基于常规DOB的系统相比其严重程度。通过仿真验证了所提分析的准确性。
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引用次数: 0
Development of abrasive super finishing method with a five-axis closed-link compact robot and fine diamond stone 五轴闭式机器人与精钻磨料超精加工方法的研制
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268272
Ryo Yonemoto, T. Hirogaki, E. Aoyama
This study investigates an improved method for super finishing of a die surface by means of a robot that holds fixed abrasive grains. A low-pressure grinding method was previously investigated to exploit the characteristics of the fine grinding stone by means of a voice coil motor (VCM). However, the VCM proved disadvantageous in that the grinding pressure changed when the height of the grinding surface was changed or the volume of the grinding stone was reduced. To solve this problem, a feedback control mechanism of the force was employed in this study, such that a constant pressure could be achieved for long periods of polishing. It was found that this allowed for the stable execution of long-term polishing, along with the previously set low pressure being maintained simultaneously with high accuracy. In addition, increased improvement of surface roughness was also achieved because polishing can be carried out at high pressures for a long period of time without any decrease in pressure occurring.
本研究探讨了一种改进的方法,超级精加工的模具表面的手段,机器人持有固定的磨料颗粒。为了充分利用细磨石的特性,研究了一种利用音圈电机(VCM)的低压磨削方法。然而,VCM是不利的,当磨削面高度改变或磨石体积减小时,磨削压力会发生变化。为了解决这一问题,本研究采用了一种力的反馈控制机制,以便在长时间的抛光中实现恒定的压力。结果发现,这允许长期抛光的稳定执行,以及先前设定的低压力,同时保持高精度。此外,由于抛光可以在长时间的高压下进行而不会出现压力下降,因此表面粗糙度也得到了提高。
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引用次数: 1
Parameter Identification of an Unknown Object in Human-Robot Collaborative Manipulation 人机协作操作中未知目标的参数辨识
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268257
Ja-Ram Jang, J. Park
In human-robot collaborative manipulation of an object, if the robot knows the intention of the human, the efficiency of the work would greatly increase. For the robot to know of the human intention, it should have the information of the force applied by the human, which can be more accurately if it can estimate the inertial and dimensional parameters online. However, the force applied by the human will disturb the parameter identification process. This paper presents a strategy to identify the inertial and dimensional parameters of an unknown object online for physical human-robot interactions. Extended Kalman filter is used for identification under the assumption that the force applied by the human is an unknown external disturbance. This approach was evaluated in simulations of physical human-robot object manipulation task.
在人-机器人协同操作物体时,如果机器人知道人的意图,将大大提高工作效率。机器人要知道人的意图,就必须有人施加的力的信息,如果能在线估计惯性参数和尺寸参数,可以更准确地了解人的意图。然而,人施加的力会干扰参数识别过程。本文提出了一种在线识别未知物体的惯性和尺寸参数的策略,用于物理人机交互。在假设人施加的力是未知的外部干扰的情况下,采用扩展卡尔曼滤波进行辨识。该方法在物理人机对象操作任务仿真中得到了验证。
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引用次数: 2
Development of an Integrated Tracking Control Algorithm for Digging Operations of an Excavator 挖掘机挖掘作业综合跟踪控制算法的开发
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268434
N. Reginald, J. Seo, Abdullah Rasul
The Excavator is one of the key equipment utilized for earthmoving tasks at construction sites. This paper aims to provide an integrative tracking control strategy comprising of position, contour, and force tracking controls for excavation tasks. A non-linear proportional-integral controller was applied for position control of hydraulic actuators and the contour control strategy was added to create an optimal path of the bucket tip minimizing contour errors. The force control was finally considered to compensate for the ground resistive force. A multiphysics simulation model was developed for an evaluation of the designed controller’s performance through co-simulation. Experimental results obtained from a test platform show that the developed control algorithms provide good tracking performance for soil digging.
挖掘机是施工现场进行土方作业的关键设备之一。本文旨在为挖掘任务提供一种包含位置、轮廓和力跟踪控制的综合跟踪控制策略。采用非线性比例积分控制器对液压作动器进行位置控制,并引入轮廓控制策略,以实现铲斗末端的最优路径,使轮廓误差最小化。最后考虑了力的控制对地面阻力的补偿。建立了多物理场仿真模型,通过联合仿真对所设计控制器的性能进行了评价。实验结果表明,所开发的控制算法对挖土具有良好的跟踪性能。
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引用次数: 2
Application of Machine Learning Towards Design Optimisation of Bio-inspired Transfemoral Prosthetic Socket for Robotic Leg Test Rig 机器学习在机器人腿试验台仿生经股假体窝设计优化中的应用
Pub Date : 2020-10-13 DOI: 10.23919/ICCAS50221.2020.9268404
Panashe Sabau, J. Chong, A. Jafari, Subham Agrawal, C. Semasinghe, Appolinaire C. Etoundi
In the past century many medical advancements in prosthetics have been achieved, however, discomfort in prosthetic socket remains one of the toughest challenges faced by both amputees and prosthetists. Wearing an uncomfortable socket can lead to users discontinuing use of their socket and subsequently reducing their long-term mobility; negatively impact their psychological health; and prolong rehabilitation. This paper continues the research conducted in earlier publications [1], [2], which introduced the concept of an automated ISO standard robotic testing rig to test a full artificial limb prosthesis (a bio-inspired transfemoral prosthetic socket attached to robotic prosthetic joints and an ankle joint). This paper presents an automated method of designing the bio-inspired socket using artificial intelligence to reduce discomfort and the design time of new or existing full artificial lower limbs using qualitative and quantitative data. The socket will be tested in a gait simulation shown in the figure 7, to safely achieve desirable walking velocities, step length, safety and comfort while consequentially reducing the physical testing on patients and consequentially reduce physical testing on patients.
在过去的一个世纪里,义肢医学取得了许多进步,然而,义肢窝的不适仍然是截肢者和义肢专家面临的最大挑战之一。佩戴不舒服的眼窝会导致使用者停止使用眼窝,从而降低他们的长期活动能力;对他们的心理健康产生负面影响;延长康复时间。本文延续了早期出版物[1],[2]中进行的研究,其中介绍了自动化ISO标准机器人测试平台的概念,以测试完整的假肢(附着在机器人假肢关节和踝关节上的仿生经股假体窝)。本文利用定性和定量数据,提出了一种利用人工智能自动设计仿生假肢的方法,以减少新型或现有全人工下肢的不适和设计时间。将在图7所示的步态模拟中测试该插座,以安全地达到理想的步行速度、步长、安全性和舒适性,同时相应地减少对患者的身体测试,从而减少对患者的身体测试。
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引用次数: 0
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2020 20th International Conference on Control, Automation and Systems (ICCAS)
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