检索结果-内蒙古大学图书馆

Evaluation of complaint damper for assessing its effectiveness and efficiency through the utilization of topology optimization

引用

Interactions 2024年第1期245卷 1-17页

作者： Emmanual, L. Narayanan, V. R. Shankara Mukesh, G. Sibi, M. Vijayan, V. Department of Robotics and Automation Easwari Engineering College Tamil Nadu Chennai600089 India Department of Mechanical Engineering M.Kumarasamy College of Engineering Thalavapalayam Tamil Nadu Karur639113 India Department of Mechanical Engineering K.Ramakrishnan College of Technology Tamil Nadu Samayapuram Trichy621 112 India

The term 'chatter' is related to the undesirable vibration produced in any equipment under dynamic operating conditions. It has a wide range of negative consequences for both the machine and the components it produces. Vibrations in the process of machining must be minimized as much as feasible. Dampers serve an important function in mitigating the impacts of chatter during machining. Dampers have traditionally been used to support machines and reduce clatter. Dampers are currently made up of numerous pieces that are mechanically joined together to perform the needed task of reducing chatter. To reduce the number of components and mechanical assembly, we use a complaint mechanism that transmits and absorb force, motion, and so on in a single monolithic structure. This paper presents a unique method to construct dampers utilizing a complaint system. A design was created implementing building pieces in a structure that has been topology optimized. The complaint damper was created using Fused Deposition Modeling (FDM). The complaint damper was employed in place of the rubber damper to evaluate performance. The experiments were carried out on a 3D printer (Fractal Twin Dragon) under various operating circumstances. During the experiment, a 1.75 mm diameter PLA spool was used as the feed. The machine attributes were taken into account. The complaint damper was located at the bottom of the machine's leg. The vibrometer VB-820HA contact type was also mounted to the machine leg and measured response that include velocity, acceleration, displacement, and frequency. The acceleration & frequency profile clearly suggest a larger magnitude when the complaint damper is used. When compared to conventional solid damping, The initial runs are at lower federate of 0.6 mm/min shows nearly identical velocity readings between the two dampers. Rubber damping resulted in a maximum displacement of 0.55 mm. The displacement created by the suggested damper is insignificant. even at higher fr

关键词： Fused Deposition Modeling

来源：评论

学校读者我要写书评

暂无评论

Multimodal risk-map for navigation planning in neurosurgical interventions

Multimodal risk-map for navigation planning in neurosurgical...

引用

作者： Gerst, Maximilian Kunz, Christian Henrich, Pit Mathis-Ullrich, Franziska Institute for Anthropomatics and Robotics Health Robotics and Automation Lab Karlsruhe Institute of Technology Karlsruhe Germany

Planning a keyhole neurosurgical intervention is challenging due to the complex brain anatomy and the risk of penetrating vital structures. This work presents a neurosurgical planning tool for safe and effective interventions in the brain by minimizing risk due to optimized access planning. The tool uses a modular architecture that allows integration of various risk structures, combined in a holistic model represented as volumetric risk maps. Risk evaluations are computed for linear and nonlinear trajectories and intuitively visualized as a projection onto the head surface. Neurosurgeons can choose between two separate modes for automatic access planning according to the type and complexity of the neurosurgical procedure. An evaluation with clinical experts demonstrates the practical relevance. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Maps

来源：评论

学校读者我要写书评

暂无评论

Research on cognitive load evaluation with subjective method in manual assembly

引用

High technology Letters 2023年第4期29卷 434-444页

作者：任彬 ZHOU Qinyu LI Qibing LUO Wenfa Shanghai Key Laboratory of Intelligent Manufacturing and Robotics School of Mechatronic Engineering and AutomationShanghai UniversityShanghai 200444P.R.China Zhejiang Key Laboratory of Robotics and Intelligent Manufacturing Equipment Technology Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201P.R.China SAIC Motor R&D Innovation Headquarters SAIC Motor Corporation LimitedShanghai 201804P.R.China

Subjective scales have different kinds of applicability in diverse *** study intends to implement a quantitative approach to determine the applicability of subjective scales in manual as-sembly work and evaluate the cognitive load of assembly workers.A multi-scale research paradigm based on subjective evaluation method is *** typical task stages are extracted from the process of assembly *** National Aeronautics and Space Administration Task Load Index(NASA-TLX)scale,PAAS scale and Workload Profile Index Ratings(WP)scale are selected for the design of 3×3 multi-factor mixed *** power spectrum density(PSD)characteris-tics of electroencephalogram(EEG)are utilized to identify the difficulty levels of the three task *** relevant indicators of scale applicability are *** results show that in terms of sensitivity,NASA-TLX scale reaches the highest sensitivity(F=999.137,P=0<0.05).In terms of validity,NASA-TLX scale possesses the best concurrent validity(P=0.0255<0.05).In terms of diagnosticity,NASA-TLX scale based on 6 dimensions takes on the best diagnostic *** terms of subject acceptability,WP scale performs the *** to the analytic hierarchy process(AHP)model,the applicability scores of NASA-TLX scale,PAAS scale and WP scale are determined as 3,2.55 and 1.6714,***,NASA-TLX scale is regarded as the most suitable subjective evaluation questionnaire for assembly workers,which is also an effective quantitative evaluation method for the cognitive load of assembly workers.

关键词： assembly worker electroencephalogram(EEG) analytic hierarchy process(AHP) National Aeronautics and Space Administration Task Load Index(NASA-TLX)scale subjective evaluation scale applicability

来源：评论

学校读者我要写书评

暂无评论

Calibration Method of Industrial Robot Kinematic Parameters Based on Improved SSA Algorithm 6

Calibration Method of Industrial Robot Kinematic Parameters ...

引用

6th International Conference on Software Engineering and Computer Science, CSECS 2023

作者： Xu, Jialu Liu, Xiaonan Li, Pengchao Wang, Jintao Guo, Haibing School of Information Science and Engineering Shenyang University of Technology Shenyang China Shenyang Institute of Automation Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang China Tianjin SIASUN Robot & Automation Co. LTD. Tianjin China

ISBN: (纸本)9798350306378

The requirements of high-end manufacturing cannot be fulfilled by industrial robot absolute positioning accuracy. A study of algorithms for improving absolute positioning accuracy in industrial robots. An improved sparrow search algorithm (ISSA) incorporating a chaotic mapping initialization population, a butterfly global search strategy, a triangle wandering strategy, and a t-distribution perturbation is proposed to identify the kinematic parameters of industrial robots. First, a robot kinematics model is established based on modified Denavit-Hartenberg (MD-H) parameters. Secondly, verify the effectiveness of the ISSA algorithm. Finally, the kinematic parameters of four T6A-19 industrial robots were determined and adjusted for validation using the ISSA algorithm. The results of the experiment demonstrate an 85.39% improvement in the accuracy of the mean absolute positional error and an 83.36% improvement in the root mean square accuracy. These results support the effectiveness and practicality of the method used. © 2023 IEEE.

关键词： Industrial robots

来源：评论

学校读者我要写书评

暂无评论

SVM based Multiclass Classifier for Gait phase Classification using Shank IMU Sensor

arXiv

引用

arXiv 2023年

作者： Khumar, Aswadh G.S. Kumar, Barath J.K. PSG College of Technology Department of Robotics and Automation Engg Coimbatore India

In this study, a gait phase classification method based on SVM multiclass classification is introduced, with a focus on the precise identification of the stance and swing phases, which are further subdivided into seven phases. Data from individual IMU sensors, such as Shank Acceleration X, Y, Z, Shank Gyro X, and Knee Angles, are used as features in this classification model. The suggested technique successfully classifies the various gait phases with a significant accuracy of about 90.3%. Gait phase classification is crucial, especially in the domains of exoskeletons and prosthetics, where accurate identification of gait phases enables seamless integration with assistive equipment, improving mobility, stability, and energy economy. This study extends the study of gait and offers an effective method for correctly identifying gait phases from Shank IMU sensor data, with potential applications in biomechanical research, exoskeletons, rehabilitation, and prosthetics. Copyright © 2023, The Authors. All rights reserved.

关键词： Support vector machines

来源：评论

学校读者我要写书评

暂无评论

Design of an Automatic Locking Nut Tightening Control System for a Vision Guided Robot 8

Design of an Automatic Locking Nut Tightening Control System...

引用

8th International Conference on automation, Control and robotics Engineering, CACRE 2023

作者： Chang, Kai Lu, Bolin Yin, Jian Tan, Guangchao Chinese Academy of Sciences Key Laboratory on Intelligent Detection Equipment Technology of Liaoning Province Shenyang Institute of Automation Chinese Academy of Sciences Institutes for Robotics and Intelligent Manufacturing Shenyang China

ISBN: (纸本)9798350302776

A set of automatic locking nut tightening control system for a vision guided robot is designed and implemented. Through hand-eye calibration, the coordinate system is unified. By the designed tool plate and tapered tooling, the calibrated reference location for the tightening tool is realized. According to the position and orientation of the reference screw, the vision system detects the offset of the current screw position, and guides the robot to adjust the pose of the tightening tool. By setting up the network topology of the control system, the data interaction of each subsystem is completed, and the automatic workflow is realized. The application of the system can avoid the relative movement between the tool and screw during the tightening process, and improve the tightening quality. © 2023 IEEE.

关键词： Calibration

来源：评论

学校读者我要写书评

暂无评论

Experimental system of active-passive integrated vibration isolation for robot with weak rigid support 4

Experimental system of active-passive integrated vibration i...

引用

4th International Conference on Artificial Intelligence, robotics, and Communication, ICAIRC 2024

作者： Chen, Lele Yin, Jiawei Huang, Liang He, Bin Zhan, Yuhan Xue, Lei Shanghai University Shanghai Key Laboratory of Intelligent Manufacturing and Robotics School of Mechatronic Engineering and Automation Shanghai China COMAC Shanghai Aircraft Manufacturing Co. Ltd Aviation Manufacturing Technology Research Institute Shanghai China

ISBN: (纸本)9798331531225

In the manufacturing and assembly process of domestic large airplanes, the vibration in the surrounding environment greatly affects the working efficiency and precision of automated equipment. According to the vibration characteristics of the cabin environment, a multi-degree-of-freedom vibration isolation platform mechanism of robotics with weak rigid support applied in the cabin section of the aircraft is proposed, an experimental platform for the vibration isolation capability of a single outrigger is constructed, and a finite element analysis is carried out on the fixed frame of this experimental platform to verify its reliability. © 2024 IEEE.

关键词： Degrees of freedom (mechanics)

来源：评论

学校读者我要写书评

暂无评论

Effects of Addition of Graphite on the Tribological Behaviour of Al7075-SiC Hybrid Composites Using Design of Experiments

引用

Journal of Bio- and Tribo-Corrosion 2024年第3期10卷 1-11页

作者： Gudipalli, Krishna Reddy V Chapke, Yashwant Guddhur, Hareesha Doddamani, Saleemsab Department of Mechanical Engineering Government Polytechnic Channasandra Karnataka Bangalore India Department of Automation & amp Robotics JSPM’S Rajarshi Shahu College of Engineering Maharashtra Pune India Department of Mechanical Engineering Government Engineering College Karnataka HuvinaHadagali India Department of Mechanical Engineering National Institute of Technology Karnataka Karnataka Surathkal India

Despite the widespread use of Al7075-SiC composites in various engineering applications, their tribological performance remains a subject of interest due to challenges related to friction and wear. This study addresses the need for improved lubrication in such composites by investigating the potential of Al7075-SiC/Graphite hybrid materials. The incorporation of graphite particles, up to 9% by weight, aims to enhance the self-lubricating properties of these composites. Stir casting is employed to fabricate specimens with varying graphite content (3–9% by weight), followed by comprehensive tribological assessments under dry sliding conditions. Factors including sliding distance, load, and graphite composition are systematically evaluated using Taguchi’s optimization techniques, including design of experiments, ANOVA, and regression analyses. Results reveal that the addition of 9% graphite content notably reduces both the coefficient of friction and wear rate. According to the data, sliding distance significantly impacts wear behaviour, followed by the applied load. In contrast, the composition has a 77% impact on the coefficient of friction than load, while the sliding distance has a relatively small impact. As a result, the Al7075-SiC/Graphite composite material demonstrated its suitability as a self-lubricating substance. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Silicon carbide

来源：评论

学校读者我要写书评

暂无评论

Diagnosis of Localized Bearing Defects using Texture Analysis of Vibration Envelope Signals and Machine Learning

Diagnosis of Localized Bearing Defects using Texture Analysi...

引用

2023 International Conference on robotics and automation in Industry, ICRAI 2023

作者： Nguyen, Cong Dai Nasir, Fazal E. Khan, Shahbaz Khan, Sheraz Ali Kim, Jong-Myon Le Quy Don Technical University Faculty of Radio-Electronic Engineering Hanoi Viet Nam Advanced Robotics and Automation Lab National Center for Robotics and Automation Peshawar Pakistan Institute of Manufacturing University of Engineering and Applied Sciences Swat Pakistan University of Engineering and Technology Department of Mechatronics Engineering Peshawar Pakistan University of Ulsan Department of IT Convergence Ulsan Korea Republic of PD Technology Ulsan Korea Republic of

ISBN: (纸本)9781665464727

Bearings are important because they play a critical role in the operation of many machines and devices by reducing friction and enabling smooth motion between two moving parts. They are commonly used in rotating machinery, such as electric motors, turbines, pumps, and gearboxes, where they support and guide the rotating shafts. The primary cause of failure in wind turbines and induction motors is bearing faults, resulting in significant downtime and economic losses. Detecting these faults accurately and promptly is crucial to preventing unexpected shutdowns. Most of the existing methods for bearing fault detection rely on envelope analysis, which involves filtering and demodulating the raw signal, and Fourier analysis of the envelope signal to identify defect frequencies. Recent research has focused on improving the visibility of these frequencies by selecting an optimal band for filtering, using sub-band analysis and spectral kurtosis, which is a complex process and can be time-consuming. This paper presents a new approach to envelope signal analysis using texture analysis of the envelope signals that are projected as 2D grayscale images where each fault generates a unique texture. These textures are encoded using the local binary pattern operator and then used for fault classification. The method is tested on a publicly available seeded fault dataset. © 2023 IEEE.

关键词： Signal analysis

来源：评论

学校读者我要写书评

暂无评论

Robot Learning from Multiple Demonstrations Based on Generalized Gaussian Mixture Model 28

Robot Learning from Multiple Demonstrations Based on General...

引用

28th International Conference on automation and Computing, ICAC 2023

作者： Dong, Jiale Si, Weiyong Wang, Ning Yang, Chenguang School of Automation Science and Engineering South China University of Technology Guangzhou China University of the West of England Bristol Robotics Lab BristolBS161QY United Kingdom

ISBN: (纸本)9798350335859

The quality of skills learned by robots from demonstrations depends on the level of demonstration by the instructor, while models such as Dynamic Motion Primitives (DMP) are extremely sensitive to the quality of demonstrations because they can only learn from a single demonstration. In this paper, we propose a method of learning from multiple demonstration. First, we model multiple demonstration data by generalized Gaussian mixture models (GMMs), then generate a smooth trajectory by the Gaussian mixture regression (GMR), and finally, the generated trajectory is modeled by DMP. This method can capture features from multiple demonstrations of the same task, reducing the impact of incorrect demonstrations on skill learning. Additionally, the generalized Gaussian mixture model has strong data fitting ability, enabling robots to learn smooth and high-quality motion skills. Finally, the effectiveness of the proposed method was verified by performing a Chinese character writing task on a Baxter robot. © 2023 IEEE.

关键词： Demonstrations

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：