检索结果-内蒙古大学图书馆

5th International Conference on mechanical engineering, ICOME 2021

作者： Hendrowati, Wiwiek Daman, Aida Annisa Amin Guntur, Harus Laksana Darmawan, Fuad Adi Laboratory of Vibration Engineering andAutomotive System Department of Mechanical Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Undergraduate Program of Mechanical Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia

ISBN: (纸本)9789811908668

There will be vibrations caused by friction between the rotating workpiece and the insert on the boring bar during the boring process. Vibrations that occur in the workpiece can be suppressed with a Dynamic Vibration Absorber (DVA). Therefore, the boring process produces a rough surface and damages the components of the lathe. In this research, DVA is placed on a workpiece by utilizing force damping in the radial direction and it is called as Rubber Radial Vibration Damper (RRVD) with rubber as a damping element. An analysis of the effect of RRVD addition on the vibration reduction response of the workpiece was carried out. The variations in this study are mass of RRVD (AISI 4340 and Copper Alloy), cutting parameters, and the ratio of length per diameter (L/D) of the workpiece overhang 7, 8, and 9. The simulation results showed that the main system's highest natural frequency and amplitude occurred at the L/D 7 without RRVD or with RRVD. In addition, the RRVD Copper Alloy mass variation has a lower natural frequency and amplitude than the AISI 4340. Based on this research, it was found that the most stable and well-reduced system was in the main system with L/D 8 and using RRVD Copper Alloy mass. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Vibration analysis

来源：评论

学校读者我要写书评

暂无评论

Design and Hybrid Impedance Control of a Compliant and Balanced Wrist Rehabilitation Device 48

Design and Hybrid Impedance Control of a Compliant and Balan...

引用

48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022

作者： Yellewa, Mwayi E Mohamed, Abdelfatah Ishii, Hiroyuki Assal, Samy F. M. Department of Mechatronics and Robotics Engineering Egypt Waseda University Japan Tanta University Faculty of Engineering Department of Production Engineering and Mechanical Design Egypt

ISBN: (数字)9781665480253

ISBN: (纸本)9781665480253

Wrist rehabilitation robotic devices have delivered the repetitive and gradual training necessary to rehabilitate individuals with wrist impairments properly. Generally, there are two approaches for the design of the wrist rehabilitation devices. In one approach, the motors are placed on the forearm with complex transmission mechanisms to reduce the weight and inertia. In the other approach, rotary motors are placed close to the wrist joints with simple design, and this leads to high weight and inertia. In this paper, a simple design of two-degrees of freedom compliant and balanced wrist rehabilitation device is proposed. It can provide the radial-ulnar deviation and flexion-extension rehabilitation motions. In the proposed design, the servomotors that are placed close to the wrist joints are counterweight balanced to reduce the inertia and the required torques. The balancing is carried out by optimizing the center of mass of the device in the SolidWorks model. A custom design series elastic unit is proposed to be coupled to the servomotor to achieve the compliance for safe human-robot interaction. Based on the device dynamics modeled by ADAMS software, hybrid position and force tracking impedance control is developed for position and force tracking through the different therapeutic exercises. The device is shown to be capable of achieving the different therapeutic exercises compliantly such as the passive, active-assisted and isometric exercises. © 2022 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

Optimum Design of a Wire-Driven Redundant Spherical Parallel Manipulator for Foot Drop Rehabilitation System 48

Optimum Design of a Wire-Driven Redundant Spherical Parallel...

引用

48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022

作者： Gamal, Ahmed Mohamed, Abdelfatah Iwata, Hiroyasu Assal, Samy F. M. Department of Mechatronics and Robotics Engineering Egypt Waseda University Japan Tanta University Faculty of Engineering Department of Production Engineering and Mechanical Design Egypt

ISBN: (数字)9781665480253

ISBN: (纸本)9781665480253

Post stroke patients may suffer from a gait disorder which is called foot drop. They may experience a toedrag, slow walking speed and a high risk of tripping. Although physical therapy exercises can be a remedy to such cases, their high cost and the lack of professional caregivers arise the need for robotic rehabilitation systems. On the other hand, the existing robotic systems for foot-drop rehabilitation are heavy and bulky. Therefore, in this paper, a lightweight foot-drop rehabilitation system based on a wire-driven redundant spherical parallel manipulator (RSPM) is developed. The proposed RSPM can provide 3-DOF movements to exercise the dorsiflexion, plantarflexion, supination, lateral and medial rotations. Kinematic and static analyses are performed for the proposed rob RSPM. In order to guarantee permissible positive tensions for the wires of the RSPM, a new performance index is introduced, called permissible tension index. Optimum design based on optimizing certain performance indices is carried out to obtain the proper dimensions of the movable platform design parameters of the proposed RSPM. A new index called permissible tension index is introduced to guarantee permissible positive tensions for the wires of the RSPM. A weighted sum of the global kinematic dexterity, global minimized transmission and the global permissible tension indices is considered for the objective function of the optimization process. The RSPM performance is evaluated over its range of motion and the reaction forces exerted on the ankle are shown to be tolerable by an injured ankle. Additionally, the Jacobian-based kinematic controller is shown to be capable of tracking the normal gait trajectories with acceptable tracking errors. © 2022 IEEE.

关键词： Kinematics

来源：评论

学校读者我要写书评

暂无评论

Development of a low-cost microfluidic chip for hyaluronidase-free oocyte denudation in mammals

引用

Biotechnology Notes 2025年 6卷 133-142页

作者： Dessouky, Ashraf Hisham El-Hussieny, Haitham El-Sherry, Taymour Mohammed Parque, Victor Fath El-Bab, Ahmed M.R. Department of Mechatronics and Robotics Engineering Egypt-Japan University of Science and Technology (E-JUST) Alexandria Alexandria 21934 Egypt Mechanical Engineering Department Helwan University Cairo Cairo 11792 Egypt Department of Theriogenology Veterinary Hospital Faculty of Veterinary Medicine Assiut University Assiut Assiut Egypt of Advanced Science and Engineering Hiroshima University Hiroshima HigashiHiroshima 739-8527 Japan

Infertility in mammals is one of the most intricate medical issues requiring non-traditional interventions. In Vitro Fertilization (IVF) is one of the modern medical technologies currently used to treat infertility. However, current IVF procedures are inaccessible and unaffordable to the majority due to the high cost, the complexity of the procedure, and the reliance on highly qualified operators. For successful IVF, oocyte denudation, the process of removing cumulus cells from oocytes, is often performed. Here, microfluidics offers the potential to enhance denudation procedures and to minimize operator variability. In this paper, we propose the configuration of a microfluidic chip for oocyte denudation whose structure hybridizes inner jagged surfaces and expansion units. The jagged surface units have the role of removing the cumulus cells surrounding the oocyte by using the wall shear stress principle, and the (rounded) expansion units have the role of rotating the cumulus cells for further deployment in subsequent jagged surfaces. The proposed device can be manufactured at a low cost (<1 USD)) by the engraving of CO₂ laser machine on PMMA material, and is able to circumvent the use of enzymatic components such as hyaluronidase. Experiments using computational simulations and manufactured microfluidic chips evaluated distinct geometry configurations of the jagged surfaces and identified the suitable flow rates for maximal shear stress and denudation performance. Manufactured samples of the proposed microfluidic devices have shown the denudation performance of 96.7 % and yield rate of 90 % at a constant flow rate of 1 ml/min. © 2025 The Authors

关键词： CO2 laser In vitro fertilization Microfluidics Oocyte denudation

来源：评论

学校读者我要写书评

暂无评论

Quantifying Joint Movement Variability in Healthy and Hemiplegic Gait using OpenSim 2

Quantifying Joint Movement Variability in Healthy and Hemipl...

引用

2nd IEEE International Conference on Interdisciplinary Approaches in Technology and Management for Social Innovation, IATMSI 2024

作者： Rafiq, Tabassum Younis, Sadia Narayan, Jyotindra Institute of Information Management and Technology Department of Biotechnology Uttar Pradesh Aligarh202001 India Government College of Engineering and Technology Department of Biomedical Engineering Jammu and Kashmir Ganderbal193504 India Indian Institute of Technology Guwahati Mechatronics and Robotics Laboratory Department of Mechanical Engineering Assam Guwahati781039 India

ISBN: (纸本)9798350360523

This study delves into the scaling capabilities of OpenSim, a biomechanical modeling tool, to scrutinize musculoskeletal alterations accompanying the hemiplegic condition compared to a healthy model. Contralateral hemiplegia (CH), characterized by unilateral paralysis, induces profound changes in bone size and significantly influences an individual's gait. Motivated by understanding the biomechanical repercussions of CH on human movement, we conducted a comprehensive investigation involving ten patients with CH, with a median age of 46 years (range: 39 to 52.0 years and height: 1.75 0.6 m). Ten healthy controls with similar body attributes were±also recruited. We assessed musculoskeletal changes post-CH using bone length data from MRI reports obtained from a hospital. Inverse kinematics in OpenSim are facilitated for a detailed comparison of joint angles between unhealthy and healthy individuals. The gait data is visualized and analyzed using statistical metrics such as mean absolute deviation, box plots, and a two-sample t-test. The results revealed significant differences in hip and ankle joint angles between healthy and hemiplegic individuals, underscored by low p-values. Interestingly, no significant difference was observed in knee joint angles (p-value = 0.9126). These findings contribute to a valuable understanding of hemiplegia-related musculoskeletal changes, offering potential avenues for tailored interventions to improve mobility and quality of life. © 2024 IEEE.

关键词： Inverse kinematics

来源：评论

学校读者我要写书评

暂无评论

A Comparison of Model-Free Controllers for Trajectory Tracking in a Plant-Inspired Soft Arm 13th

A Comparison of Model-Free Controllers for Trajectory Tracki...

引用

13th International Conference on Biomimetic and Biohybrid Systems, Living Machines 2024

作者： Nazeer, Muhammad Sunny Ansari, Yasmin Tauqeer Falotico, Egidio Laschi, Cecilia Department of Mechanical Engineering College of Design and Engineering National University of Singapore Singapore Singapore Bioinspired Soft Robotics Lab Istituto Italiano di Tecnologia Genoa Italy The Biorobotics Institute Scuola Superiore Sant’Anna Pontedera Italy

ISBN: (纸本)9783031725968

The field of soft robotics is experiencing a transformative phase with the emergence of self-supporting modular soft robot arms, inspired by design principles drawn from climbing plants, which are gaining recognition as a rich source of bio-inspiration. The vision to deploy these systems in highly unstructured environments, qualifies the need to investigate model-free algorithms that facilitate motion capabilities based solely on data regarding system-environment interactions. This paper delves into the development of model-free controllers to enable tracking capabilities in these systems. While the trajectory tracking task is already recognized as challenging in the context of redundant continuum/soft arms, the difficulty is compounded when aiming to generate control policies solely from sequential feedback from the environment. The novelty of this work lies in the development of both learning-based and learning-free model-free computational frameworks to address this task. Both controllers are validated on a 9-DoF modular cable-driven plant-inspired soft arm for moving through multiple trajectories in 3D space. The comparison of these controllers holds significant insights to future directions for the practical applicability of these systems in real-world scenarios, and are promising to pave way for novel application scenarios. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Robotic arms

来源：评论

学校读者我要写书评

暂无评论

Performance of Pico Scale Turgo Turbine in Difference the Nozzle Diameter

引用

International Journal of Fluid Machinery and Systems 2022年第1期15卷 130-136页

作者： Adanta, Dendy Syofii, Imam Sari, Dewi Puspita Wiyono, Apri Department of Mechanical Engineering Faculty of Engineering Universitas Sriwijaya Indralaya South Sumatera 30662 Indonesia Study Program of Mechanical Engineering Education Universitas Sriwijaya Indralaya South Sumatera 30662 Indonesia Department of Automotive Engineering Education Universitas Pendidikan Indonesia Bandung West Java 40154 Indonesia

Pico scale Turgo turbine (PSTT) is proper as a power plant to be applied for remote areas because of its simple construction, cheap investment cost, and good performance above 35%. However, the design of PSTT is still based on estimation because the wheel diameter and nozzle diameter (D/d) ratio are not yet in reasonable agreement. Furthermore, the literature on D/d affects PSTT performance has not been comprehensive. Accordingly, this study investigates the relation of D/d on PSTT performance and its effect on the U/Vjet. Based on experimental results, the relation of D/d and U/Vjet to PSTT performance is parabolic (expressed by polynomial quadratic);the maximum configuration of D/d of 22, and U/Vjet between 0.42 to 0.47. © 2022, Turbomachinery Society of Japan. All rights reserved.

关键词： Energy conversion

来源：评论

学校读者我要写书评

暂无评论

Experimental study of hardness and corrosion properties of AZ91 magnesium alloy after electroless nano composite coating

引用

Materials Today: Proceedings 2022年 62卷 2926-2929页

作者： Sayyad, Dr Farook Sayyad, Dr Shabnam Ansari, Dr. Md. Imran Mechanical Engineering Department. Dr. D. Y. Patil School of Engineering Pune India Associate Professor Computer Engineering Department. AISSMS College of Engineering Pune India Robotics & Automation Department. Bharati Vidyappeth Pune India

Magnesium and its numerous alloys have excellent rigidity, low density, and electromagnetic protection properties, making them ideal for usage in numerous industrial components. Magnesium alloys have a significant disadvantage in terms of corrosion and hardness, which restricts their practical uses. One of the most recent ways for improving the corrosion and hardness of Mg alloys is electro-less nano-coating. The experimental research of corrosion and hardness of AZ91 Mg Alloy due to nano composite coating procedures of ENi-B-TiO2is examined in this study. It would be useful to conduct a thorough examination, including experimental analysis, into the possibilities of increasing the deposit efficiency and characteristics of composite deposits by designing a suitable bath composition and operating circumstances. It has been discovered that as the concentration of titania particles increases, so does the surface hardness of coatings. The optimal concentration of second-phase (titania) particles and bath agitation are also examined in order to get superior surface properties following nano coating. Following this nano coating, the materials may be employed for a variety of materials engineering applications. © 2022

关键词： Surface properties

来源：评论

学校读者我要写书评

暂无评论

Investigation of thermal conductivity and physical properties of oil palm trunks/ramie fiber reinforced biopolymer hybrid composites as building bio-insulation

引用

Materials Today: Proceedings 2022年 60卷 373-377页

作者： Mawardi, Indra Aprilia, Sri Faisal, Muhammad Rizal, Samsul Doctoral Program School of Engineering Post Graduate Program Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Mechanical Engineering Politeknik Negeri Lhokseumawe Lhokseumawe24301 Indonesia Department of Chemical Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia Department of Mechanical Engineering Universitas Syiah Kuala Banda Aceh23111 Indonesia

The current buildings insulating materials in the construction market, which mainly consist of synthetic materials, have a high performance in thermal resistivity. However, they negatively impact the human health and the environment, thereby finding bio-insulating materials is necessary. This research investigates the thermal conductivity and physical performance of oil palm trunks/ramie fibers reinforced biopolymer hybrid composites for thermal insulation of buildings. The hybrid composites were further prepared using oil palm trunk particles, ramie fiber as the reinforcement, and tapioca starch as a biopolymer binder. All the manufactured hybrid composites exhibited thermal conductivity in a range of 0.0723 W/mK to 0.1344 W/mK and density of 732 kg/m3 to 801 kg/m3, respectively. Sample C1, with a density of 732 kg/m3 had the lowest thermal conductivity of (0.0723 W/mK). Moreover, the minimum absorbed water (53.66%) and thickness swelling (21.36%) were found in the C1 sample hybrid composites after 24-hours immersion in water. Thermal conductivity performance was influenced positively by physical properties. Therefore, the results of this research show that waste oil palm trunks and ramie fiber could be used as a thermal insulating material for buildings. © 2022

关键词： Thermal conductivity

来源：评论

学校读者我要写书评

暂无评论

Understanding Approaching Behavior for a Wheelchair with a Robotic Arm: A Human Study for Improving Autonomous Navigation

Understanding Approaching Behavior for a Wheelchair with a R...

引用

2023 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2023

作者： Sarathchandra, H.A. Harindu Y. Priyanayana, K.S. Jayasekara, A.G.B.P. Gopura, R.A.R.C. University of Moratuwa Intelligent Service Robotics Group Department of Electrical Engineering Moratuwa10400 Sri Lanka University of Moratuwa Bionics Laboratory Department of Mechanical Engineering Moratuwa10400 Sri Lanka

ISBN: (纸本)9798350337020

An intelligent wheelchair is a system that evolves its functions for the well-being of humankind in the present status of robotics. Due to the active evolution of these wheelchair systems wheelchair-mounted robotic arms can be caught as the next level of development. However, the current state of intelligence is far behind the expansion and this lack causes to add extra cognitive load on handicapped users. Most of the available hindrances to autonomous operation could certainly be achieved by replicating natural human behaviors. Under these circumstances understanding human cognition on positioning a wheelchair around a table will drastically ease the autonomous object manipulation tasks by these systems. Hence to understand natural human behavior, a human study with three sub-studies was designed and reveal the prominent factors behind human cognition. Results were analyzed statistically to identify the significance of the considered factors. In lite of the study, approaching and positioning of the wheelchair mainly depend on the object position, obstacle position, and obstacles configuration within the considered workspace. Further orientation mainly depends on the object's position and approaching direction. Besides, these outcomes would be extremely beneficial in synthesizing human cognition to build human-friendly mobile robots for uplifting users' lives as well. © 2023 IEEE.

关键词：

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：