检索结果-内蒙古大学图书馆

2024 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2024

作者： Peng, Qing Chen, Gen Huang, Zeyu Zhang, Yuqiang Cai, Xintian Chen, Xiao-Jia Hu, Zhongwei Harbin Institute of Technology School of Science Beijing China Institute of Mechanics Chinese Academy of Sciences State Key Laboratory of Nonlinear Mechanics Beijing China Guangdong Aerospace Research Academy Beijing China Chinese Academy of Sciences State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Beijing China Huaqiao University Institute of Manufacturing Engineering Beijing China Huaqiao University Institute of Mechanical Engineering and Automation Beijing China Huaqiao University Institute of Manufacturing Engineering Xiamen China Huaqiao University Institute of Mechanical Engineering and Automation Xiamen China Hubei University of Technology School of Mechanical Engineering Wuhan China Harbin Institute of Technology School of Science Shenzhen China

ISBN: (纸本)9798350362107

TPDH-graphene is a newly predicted two-dimensional carbon material with exceptional physical properties, positioning it as a promising candidate for nanoelectronics applications. Using classical molecular dynamics simulations, we investigated the anisotropic properties of the material and assessed how temperature influences its mechanical behavior. The results demonstrate that TPDH-graphene shows significant mechanical anisotropy, displaying superior tensile toughness and fracture strength along the zigzag direction in comparison to the armchair direction. At high temperatures up to 1200 K, the material exhibits a certain degree of tensile toughness in the armchair direction. © 2024 IEEE.

关键词： Anisotropy

来源：评论

学校读者我要写书评

暂无评论

Inverse Origami Design Model for Soft Robotic Development

引用

Soft robotics 2024年第1期11卷 131-139页

作者： Hu, Qiqiang Li, Junyang Tao, Jian Dong, Erbao Sun, Dong Department of Biomedical Engineering City University of Hong Kong Hong Kong Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei China Department of Electronic Engineering Ocean University of China Qingdao China CAS Key Laboratory of Mechanical Behavior and Design of Materials School of Engineering Science University of Science and Technology of China Hefei China Centre for Robotics and Automation Shenzhen Research Institute of City University of Hong Kong Shenzhen China

Origami provides an opportunity to construct a wide range of 3D functional structures by folding a flat sheet. It can be used to develop various soft functional robots by combining soft smart actuators. However, a simple and an effective model that can address the challenging problem of designing origami patterns to connect origami design with robotics is lacking, thereby greatly increasing the threshold of soft origami robots and hindering its development. This study proposes an easy-to-use inverse origami design model to generate the flat crease pattern from the desired folded shape automatically while simulating origami morphing by simply providing the shape parameters or 2D shape graphics. This method overcomes the difficulty of origami design and enables a close connection between origami and robotics. Through this method, various soft origami robots can be developed with low design complexity and time cost to achieve different functions, thereby promoting the development of soft origami robots. © 2024 Mary Ann Liebert Inc.. All rights reserved.

关键词： Robots

来源：评论

学校读者我要写书评

暂无评论

Analyzing Factors Influencing the Adoption of Shared Car Services: A Causal Inference Approach

Analyzing Factors Influencing the Adoption of Shared Car Ser...

引用

2023 IEEE International Conference on Unmanned Systems, ICUS 2023

作者： Liu, Qingchao Chen, Siqi Zhao, Jingya Cai, Yingfeng Chen, Long Gao, Hongbo Automotive Engineering Research Institute Jiangsu University Zhenjiang China School of Mechanical and Aerospace Engineering Nanyang Technological University Zhenjiang China Jiangsu University Research Institute of Engineering Technology Zhenjiang China Department of Automation University of Science and Technology of China Hefei China Institute of Advanced Technology University of Science and Technology of China Hefei China

ISBN: (纸本)9798350316308

Understanding the factors that influence people's decisions to use shared automobile services is crucial, given the rising popularity of this creative and environmentally friendly mode of transportation. This paper explores the adoption of shared car-sharing services by applying meta-learners to estimate treatment effects and understand the causal relationships between different variables. The findings show that the travel purpose and distance greatly influence t he choice o f shared a utomobile services. The X-learner is the most accurate in predicting when we evaluate the predictive performance of various meta-learners. Based on this methodology, future studies could expand to include additional influencing factors or compare the relationships between different services and influencing factors. © 2023 IEEE.

关键词： Machine learning

来源：评论

学校读者我要写书评

暂无评论

Toolpath and Tool Design Innovations in Deformation Machining for Superior AA-7075 T6 Fins 6

Toolpath and Tool Design Innovations in Deformation Machinin...

引用

6th International Conference on Advancements in Materials and Manufacturing, ICAAMM 2024

作者： Ponnusamy, Prasanth Seenivasan, S. Loganathan, Ganesh Babu Magesh Babu, D. Sivalingam, A. Nanthakumar, S. Girimurugan, R. Department of Mechanical Engineering Tagore Institute of Engineering and Technology Tamilnadu Salem636 112 India Department of Mechanical Engineering Rathinam Technical Campus Tamilnadu Coimbatore641 021 India Department of Robotics and Automation Rajalakshmi Engineering College Tamilnadu Chennai602 105 India Department of Mechatronics Engineering Velammal Institute of Technology Tamilnadu Panjetty601 204 India Department of Mechatronics Engineering Sona College of Technology Tamilnadu Salem636 005 India Department of Mechanical Engineering PSG Institute of Technology and Applied Research Tamilnadu Coimbatore641 062 India Department of Mechanical Engineering Nandha College of Technology Tamilnadu Perundurai638 052 India

A hybrid manufacturing process, deformation machining (DM) combines subtractive manufacturing with incremental forming. Monolithic components with complex profiles are created through the hybridization of manufacturing technologies, which also reduces the wastage of raw materials. The properties of geometry and surface quality of the fin made from the aluminum alloy Al-7075 T6 using the DM process's bending mode was examined in this research, as were the effects of various approaches, toolpath methods, and tool design. To achieve the desired shape for the machined fin, various combinations of arcuate and slanting fin toolpath techniques were explored utilizing both top-down and bottom-up methods. The bottom-up method and the arcuate toolpath strategy were used to investigate various tool profiles. Using the best combination of toolpath strategy and tool profile, named as the T3 tool profile, which has a 0.6 mm nose radius and a circular sector, bottom-to-top (BTT)technique, and arcuate toolpath method, components with better geometrical features and surface roughness (SR) were produced. The analysis of the forming force in the bending approach of the DM progression was further carried out using this optimal combination. © Published under licence by IOP Publishing Ltd.

关键词： Bending (forming)

来源：评论

学校读者我要写书评

暂无评论

Vibration characteristics of gear system with a cracked-gear tooth: Modeling and experiments 8

Vibration characteristics of gear system with a cracked-gear...

引用

2022 8th International Forum on Manufacturing Technology and engineering Materials, IFEMMT 2022

作者： Zhao, Songtao Ma, Hui Jiang, Yuting Wang, Yaping Fu, Kunkun Tongji University School of Mechanical Engineering Shanghai201804 China Harbin Marine Boiler and Turbine Research Institute Harbin150078 China Northeastern University School of Mechanical Engineering and Automation Shenyang110819 China Harbin University of Science and Technology College of Mechanical Power Engineering Harbin150080 China Tongji University School of Aerospace Engineering and Applied Mechanics Shanghai200092 China

Gear tooth crack failure is a cruel problem in the gear transmission system. The research on the simulation and experiment is the hotpots in the field. The theoretical and experimental investigations on the vibration characteristics of a gear system with a cracked gear tooth are carried out in this study. A finite element (FE) model is built to predict the crack propagation path in a gear tooth and determine the time-varying mesh stiffness (TVMS) of gear pairs. A dynamic model of the gear system is developed using the lumped-mass model. The established models are validated by comparing the computing results with experimental ones. The influences of crack length on TVMS and vibration characteristics of the gear system are analyzed in detail. The proposed methods can provide useful guidance for fault diagnosis and dynamic performance evolution prediction of a gear system. © Published under licence by IOP Publishing Ltd.

关键词： Gear teeth

来源：评论

学校读者我要写书评

暂无评论

Towards Robo-Coach: Robot Interactive Stiffness/Position Adaptation for Human Strength and Conditioning Training

Towards Robo-Coach: Robot Interactive Stiffness/Position Ada...

引用

IEEE International Conference on robotics and automation (ICRA)

作者： Chenzui Li Xi Wu Tao Teng Sylvain Calinon Fei Chen Department of Mechanical and Automation Engineering T-Stone Robotics Institute The Chinese University of Hong Kong Hong Kong Hong Kong Center for Logistics Robotics Hong Kong Idiap Research Institute Martigny Switzerland

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

Traditional strength and conditioning training relies on the utilization of free weights, such as weighted implements, to elicit external stimuli. However, this approach poses a significant challenge when attempting to modify or adjust the loads within a single training set. This paper introduces an innovative method for achieving adjustable loads during resistance training by leveraging physical Human-Robot Interaction (pHRI). The primary objective is to regulate targeted muscle activation through the use of Robo-Coach (robotic coach system). We first utilize a Task-Parameterized Gaussian Mixture Model (TP-GMM) to learn the motion of coach demonstration, which can be generalized for the trainees. The 3D path extracted from the generated trajectory is then projected onto a 2D plane with respect to the direction of the load. Furthermore, we propose a hybrid stiffness/position generator for online task execution. This generator determines the desired positions in the 2D plane according to the contact point displacements in the stimuli direction and, simultaneously, sets the desired stiffness based on the muscle activation feedback. Finally, the Robo-Coach is implemented with a variable impedance controller to achieve load-adjustable resistance training with the trainee. The biceps curl exercises were conducted and the results showed favorable performance, indicating the effectiveness of this approach.

关键词： Training Three-dimensional displays Human-robot interaction Muscles Generators Trajectory Impedance

来源：评论

学校读者我要写书评

暂无评论

Aerodynamic and aeroacoustic impact of the axial distance upon contra-rotating rotors during hovering condition

Aerodynamic and aeroacoustic impact of the axial distance up...

引用

AIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2023

作者： Li, Pengyu Yang, Yannian Zhang, Haoyu Liu, Yu Li, Qingxi Noack, Prof. Bernd Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen Key Laboratory of Complex Aerospace Flows Guangdong Shenzhen518055 China Key Laboratory of Autonomous Systems and Networked Control Ministry of Education Unmanned Aerial Vehicle Systems Engineering Technology Research Center of Guangdong School of Automation Science and Engineering South Guangdong510640 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen Key Laboratory of Complex Aerospace Flows Guangdong Shenzhen518055 China AVIC General Aircraft Research Institute Zhuhai Shenzhen Key Laboratory of Complex Aerospace Flows Guangdong519040 China School of Mechanical Engineering and Automation Harbin Institute of Technology Guangdong Shenzhen518055 China

ISBN: (数字)9781624107047

ISBN: (纸本)9781624107047

Contra-rotating rotors have the advantage of compactness and redundancy, which can be observed in many unmanned aerial vehicles. One significant installation parameter for the contra-rotating rotors is the axial distance between the upper and lower rotors, which influences both the time-averaged and unsteady loading of the rotors, as well as the aeroacoustic noise emission. Through experimental methods, each rotor is mounted to a six-component balance to study the impact of the axial distance on the two rotors, and an microphone arc-array is used to study the noise emission and directivity in an anechoic chamber. Two rotors are set at the same rotational speed for all axial distance settings. The results indicate that the increase of axial distance is advantageous for the aerodynamic performance increase and noise reduction, especially in the axial range of 0.1 diameter. The recovery of aerodynamic performance is due to the fully developed slipstream which reduces the mutual influence between the two rotors. The noise reduction is mainly due to the reduced velocity fluctuation alleviates the inter actiontonal noise, although the broadband noise becomes larger as the axial distance increases. © 2023, American institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Noise abatement

来源：评论

学校读者我要写书评

暂无评论

Prescribed performance-based adaptive dynamic surface control for pump-controlled hydraulic systems with matched and mismatched disturbances

引用

Alexandria engineering Journal 2025年 128卷 544-555页

作者： Qian-Kun Liang Yan Cai Bing-Long Wang Jin-Chun Song Hubei Key Laboratory of Aerospace Intelligent Control Technology Hubei Sanjiang Aerospace Hongfeng Control Ltd China Space Sanjiang Group Ltd Xiaogan 432003 China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110169 China Key Laboratory of Marine Robotics Shenyang Liaoning Province 110169 China School of Mechanical Engineering and Automation Northeastern University Shenyang 110819 China

Uncertainties, including parametric and unstructured uncertainty, are the main obstacles for hydraulic systems to achieve high precision control. This paper investigates the asymptotic tracking problem of a pump-controlled hydraulic system subject to parametric uncertainties and matched and mismatched time-varying disturbances. First, a predefined performance function is introduced into the controller design to guarantee transient and final tracking accuracy. Then, a continuous differentiable friction model is utilized for feedforward compensation, reducing the designed conservativeness and improving the tracking performance. Moreover, robust terms suppress mismatched and matched disturbances and guarantee asymptotic stability. Adaptive dynamic surface control (ADSC) with nonlinear filters is adopted to reduce the burden of online calculation and improve control accuracy. As a result, a prescribed performance-based adaptive dynamic surface controller is proposed to achieve asymptotic tracking of a pump-controlled hydraulic system. The proposed control strategy is numerically verified and experimentally validated.

关键词： Adaptive dynamic surface control Pump-controlled hydraulic systems Asymptotic tracking Prescribed performance control Disturbances

来源：评论

学校读者我要写书评

暂无评论

Grating‐like anechoic layer for broadband underwater sound absorption

引用

International Journal of mechanical System Dynamics 2022年第3期2卷 265-277页

作者： Chenlei Yu Mingyu Duan Wei He Xin Chen Fengxian Xin Tian J.Lu State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi'an Jiaotong UniversityXi'anChina MOE Key Laboratory for Multifunctional Materials and Structures School of Aerospace EngineeringXi'an Jiaotong UniversityXi'anChina Department of Advanced Manufacturing and Robotics College of EngineeringPeking UniversityBeijingChina Xi'an Modern Chemistry Research Institute Xi'anChina State Key Laboratory for Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina

To address the challenging task of effective sound absorption in the low and broad frequency band for underwater structures,we propose a novel grating‐like anechoic layer by filling rubber blocks and an air backing layer into metallic *** metallic gratings are incorporated into the anechoic layer as a skeleton for enhanced viscoelastic dissipation by promoting shear deformation between rubber and metal *** introduction of an air backing layer releases the bottom constraint of the rubber,thus intensifying its deformation under acoustic *** on the homogenization method and the transfer matrix method,a theoretical model is developed to evaluate the sound absorption performance of the proposed anechoic layer,which is validated against finite element simulation *** is demonstrated that a sound absorption coefficient of the grating‐like anechoic layer of 0.8 can be achieved in the frequency range of 1294-10000 *** the importance of sound absorption at varying frequencies,the weighted average method is subsequently used to comprehensively evaluate the performance of the anechoic ***,with structural density taken into consideration,an integrated index is proposed to further evaluate the acoustic properties of the proposed anechoic ***,the backing conditions and the boundary conditions of finite‐size structures are *** results provide helpful theoretical guidance for designing novel acoustic metamaterials with broadband low‐frequency underwater sound absorption.

关键词： underwater sound absorption broadband transfer matrix method rubber coating

来源：评论

学校读者我要写书评

暂无评论

Reinforcement Learning for Dynamic Task Execution: A Robotic Arm for Playing Table Tennis

Reinforcement Learning for Dynamic Task Execution: A Robotic...

引用

IEEE International Conference on robotics and Biomimetics

作者： Zida Zhao Haodong Huang Shilong Sun Jing Jin Wenjie Lu School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen China Harbin Institute of Technology Shenzhen State Key Laboratory of Robotics and Systems (HIT) Suzhou Research Institute of HIT

ISBN: (数字)9798331509644

ISBN: (纸本)9798331509651

Dynamic tasks like table tennis pose a significant challenge for robots, although relatively easy for humans to learn. These tasks require precise control of rapid movements and timing in situations where the estimation of the flying ball and the robot's state is imprecise. Traditional model-based control methods struggle to accurately model and adapt to these dynamic changes, leading to difficulties and challenges in practical applications. To address this issue, a table tennis hitting method for a robotic arm based on reinforcement learning (RL) is proposed in this paper. Firstly, a simulation model of a robotic arm with eight degrees of freedom for playing table tennis was constructed. Secondly, a simple and effective reward function was designed to accomplish the task of hitting the table tennis ball with the robotic arm. Finally, two sets of experiments involving single and random ball launches were designed. Experimental results demonstrate that the proposed method enables the robotic arm to accurately hit the table tennis ball, showcasing the potential of RL in dynamic tasks.

关键词： Adaptation models Sports equipment Filtering Estimation Reinforcement learning Manipulators Robustness Timing PD control Sports

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：