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Analysis of Stick-slip Motion in Mechanical Rotating Screen Based on Virtual Prototype

Analysis of Stick-slip Motion in Mechanical Rotating Screen ...

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3rd Asian Pacific conference on mechatronics and Control engineering (APCMCE 2015) and 2nd international conference on Advanced Materials in Sports Equipment Design (AMSED 2015) and 3rd international conference on Sport Material, Modelling and Simulation (ICSMMS 2015) and 3rd international conference on Manufacturing (MANUFACTURING 2015)

作者： Congyi Wu Lianzhe Liu Huashu Zhang Yifei Liu Songxin Shi National Engineering Research Center of Manufacturing Equipment Digitization HUST

In consideration of the Mechanical Rotating Screen, rotary equipment applied in displaying industry, exists stick-slip motion when it is running at low speed. In this paper, a method for structure optimization based on virtual prototype, and focusing on the important connection parts of the transmission path is proposed. Replacing important rigid parts by flexible parts, adding spring-damper unit of joint surface, adding contact force of planetary worm gear system are the essential techniques in the process of building the virtual prototype of Low-speed Rotary Subassembly. Meanwhile, a revised scheme aiming at the important connection parts of Low-speed Rotary Subassembly is put forward by studying the transmission path of the mechanical structure. Analysis of this modified program through dynamics simulation based on the virtual prototype is made. In the scope of low frequency 0-20 Hz, oscillation series of the optimized curves decreases 3.67 d B under X-direction incentive, and 1.57 d B under Y-direction incentive. Stick-slip motion improved when the conclusion applied in the second generation of Mechanical Rotating Screen. The proposed method plays a guiding role to solve the phenomenon of stick-slip motion of rotary equipment in actual engineering.

关键词： Stick-slip motion Rigid-flexible coupling Spring-damper unit Virtual prototype Structure optimization

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Source-based disjoint multi-path routing protocol for underwater acoustic networks

Source-based disjoint multi-path routing protocol for underw...

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robotics, Automation and Intelligent Control (ICRAIC), international conference on

作者： Tingwei Lou Shaojian Yang Yu Yuan Xiaoxiao Zhuo Yufan Yuan Yan Wei Xingbin Tu Fengzhong Qu Hainan Institute Zhejiang University Sanya China Zhejiang Key Laboratory of Ocean Observation-Imaging Testbed Zhejiang University Zhoushan China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China The Engineering Research Center of Oceanic Sensing Technology and Equipment Ministry of Education Zhoushan China

As acoustic communication environment is characterized by limited bandwidth, long propagation delay and high bit error rate, different routing protocols have been proposed to address these issues. In this paper, we propose a source-based disjoint multi-path routing protocol for underwater acoustic communication networks. In this protocol, each data packet is routed by the relay node’s cost, which is determined by the initial hop count, the energy consumption, and the packet collision probability. Once the routing path is determined, the path cost will be updated based on the cost of relay nodes and related interference nodes. Through simulation, we demonstrate that the proposed routing protocol significantly improves network throughput, reduces end-to-end delay, and increases packet delivery rate.

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Graph Attention Social Recommendation Model Based on Similar Item Graph

Graph Attention Social Recommendation Model Based on Similar...

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Computer, Control and robotics (ICCCR), international conference on

作者： Yuan Zhang Yue Shi Xueqing Lu Doudou Zhang School of Electronics and Information Engineering Anhui Jianzhu University Hefei China

Social recommendation improves the performance of recommendation systems by mitigating the effects of data sparsity on user prediction through the social attributes in users' social networks. However, existing social recommendation models often use user-item interaction graphs to construct item feature vectors, ignoring the effects of similar items. In addition, the correlation between feature vectors is not considered when using inner products of elements to model the interaction between user and item feature vectors. In this paper, we propose a graph attention social recommendation model based on similar item graphs (SIG-GATSR), initially enabling the user-item interaction graph, social relationship graph, and similar item graphs to transfer information on the network through an improved graph attention network, and then constructing item feature vectors by combining similarity. Subsequently, we explicitly model the correlation between user and item feature vectors by performing the outer product operation. The final rating prediction is then obtained by modeling the interaction using multilayer convolutional neural networks. Detailed experimental results of Ciao, Epinions and Flixter showed that the proposed social recommendation model outperforms other related models in terms of prediction accuracy and normalized discounted cumulative gain (NDCG).

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Novel Approach Using Passive UHF RFID for Grain Moisture Detection 3rd

Novel Approach Using Passive UHF RFID for Grain Moisture Det...

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3rd international conference on Control, Instrumentation and mechatronics engineering, CIM 2022

作者： Radzi, Ainaa Syamim Mohd Kamarudin, Latifah Munirah Mohamed, Latifah Zakaria, Ammar Rahiman, Mohd Hafiz Fazalul Zakaria, Syed Muhammad Mamduh Syed Ndzi, David Lorater Perlis Arau02600 Malaysia Perlis Arau02600 Malaysia Perlis Arau02600 Malaysia Perlis Arau02600 Malaysia School of Computing Engineering and Physical Science University of the West of Scotland Paisley United Kingdom

ISBN: (纸本)9789811939228

This paper proposes a novel method to detect moisture hotspots and irregularities in rice grain storage using low-cost passive UHF RFID technology. Experiments were designed with a UHF RFID handheld reader to test rice moisture levels of 12%, 16%, 20% and 24%. Two containers were used in the study where Container A was filled with grains with a 12% moisture level and container B is inserted into Container A and contained 2 kg rice samples of varying moisture contents. The RFID reader was positioned outside the container to measure the received signal strength indicator (RSSI) from the RFID tags placed within the containers. The attenuation of the signal is analyzed to obtain a correlation between moisture content (MC) and RSSI values. Results show a positive correlation between the RSSI and MC of rice which can be used to identify inconsistencies in moisture distribution in stored grain. An empirical model has been proposed which can be used to estimate RSSI values given the moisture content or vice versa for RFID operating at 915 MHz. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Radio frequency identification (RFID)

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IoT-Powered AC Temperature Management for Eco-Smart Infrastructures 2

IoT-Powered AC Temperature Management for Eco-Smart Infrastr...

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2nd international conference on Intelligent Data Communication Technologies and Internet of Things, IDCIoT 2024

作者： Sharma, Shrey Randhawa, Princy SmarDen Automation Pvt. Ltd. Haryana Bahadurgarh124507 India Manipal University Jaipur Department of Mechatronics Engineering Jaipur India

ISBN: (纸本)9798350327533

The use of air conditioners (ACs) in offices and institutions has been increasing rapidly in recent years. This is due to the rising temperatures and the increasing demand for comfort. However, the use of ACs also leads to a significant increase in energy consumption. With the help of Internet of things, ESP8266[1] based IoT Edge device it is possible to improve the energy efficiency of ACs in offices and institutions. As per the guidelines1 issued by the government, by increasing the temperature of any AC by 1 degree, we can save 6% of the energy. This research developed an economical IoT edge device that can be installed near any AC, which will automatically broadcast the IR signals to Set the temperature to 24 degree at an interval of 10 minutes which will set the desired temperature of AC to 24 degrees even if it manually changed by anyone, it will also be having a Temperature and Humidity sensor to note the current room temperature reading and upload it on the server. This can help to ensure that the AC is only running at the most efficient setting. In addition, another ESP8266 based IoT edge device will be installed at the AC circuit that will control its ON/OFF operation and will share the data of Power Consumption by AC to a central Node-red[3] IoT Dashboard which will be used to monitor and control all the ACs remotely via a Web-dashboard. In previous studies, this whole process was done manually for a single AC using 3rd party MQTT[3] cloud servers, however this research is done to make this complete process human independent, building custom MQTT broker[4] and can be installed at hundreds of individual ACs to make a cluster and central Dashboard[5] to operate all of them independently. This data can be used to identify opportunities for improvement, such as predictive maintenance of AC. The use of IoT to improve the energy efficiency of ACs in offices and institutions has the potential to save a significant amount of energy. This can help to reduce the en

关键词： AC-Energy Efficiency IoT Temperature

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Study on a New Type of Rotated Insertion Colonovideoscope Robot

Study on a New Type of Rotated Insertion Colonovideoscope Ro...

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international conference on Bioinformatics and Biomedical engineering (ICBBE)

作者： Qingkai Liu Tianyu Xie Dept. of Biomed. Eng. Peking Univ. Beijing China

Conventional colonoscopy frequently causes pains to patients and sometimes even leads to enterobrosis and other medical accidents. This occurs mainly because the operation technique of colonoscopy is so complicated that there are only a small amount of professional doctors can complete the insertion procedure in a short time. Therefore, a new type of rotated insertion Colonovideoscope robot is developed. The robot with an adopting self-propelled motivating device and direction control system can creep into large intestine just like a snake. Having designed the insertion tube and spiral structure, we chose multiple sorts of materials to manufacture them. Moreover, insertion test using human large intestine model was finished and the questions in test were analyzed to improve the original structure. The test result shows that some certain propulsion in large intestine model can be realized. This study founds the basis to develop this new robot for colonoscopy in the future.

关键词： Robots Medical robotics Colonoscopy Intestines Testing Pain Accidents Control systems Creep Spirals

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A Stable Walking Strategy of Quadruped Robot Based on Foot Trajectory Planning

A Stable Walking Strategy of Quadruped Robot Based on Foot T...

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international conference on Information Science and Control engineering (ICISCE)

作者： Mingmin Liu Fang Xu Kai Jia Qifeng Yang Chong Tang State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang Liaoning China University of Chinese Academy of Sciences Beijing China Shenyang SIASUN Robot & Automation Co. LTD. China Shenyang Liaoning Province China

ISBN: (纸本)9781509025367

For a quadruped robot to implement steady moving on horizontal planes, avoiding the impact against the ground, a foot trajectory planning method underling low contact impact was presented. At first, kinematic model of the quadruped robot though D-H algorithm have been established. Then, the foot trajectories, which are continuous not only in displacements and velocities but also in accelerations, was scheduled based on the walking gait. Lastly, the steering and straight line movements of the robot were simulated, simulation experiments show that the quadruped robot motion stably on horizontal planes without impact and sliding.

关键词： Legged locomotion Trajectory Foot Planning Robot kinematics Kinematics

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Contribution of passive properties of muscle-tendon units to the metacarpophalangeal joint torque of the index finger

Contribution of passive properties of muscle-tendon units to...

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IEEE/RAS-EMBS international conference on Biomedical robotics and Biomechatronics (BioRob)

作者： Pei-Hsin Kuo Ashish D. Deshpande Department of Mechanical Engineering University of Maine ME USA

The passive joint behavior in the human hand is the result of passive properties of the muscle-tendon units (MTUs) and the elasticity of the soft tissues across the joint. The purpose of the study was to investigate the relative contribution of the MTUs to the net passive torque of the index finger metacarpophalangeal (MCP) joint in flexion and extension. We developed mathematical models to explicitly determine the passive contributions of the seven MTUs to the MCP joint torque. We then compared the computed MTU passive torque to the net passive torque derived from data collected from human subjects. The results show that the MTU properties did not produce the greatest contribution to the the total passive joint torque, especially, at the extremities of the range of motion are dues to factors such as the soft joint tissues. Also, the extrinsic MTUs produced much higher passive joint torques compared to the intrinsic MTUs, and the intrinsic MTUs presented small counterbalance to the net MTU torque in extension. The revelation that most of the net passive joint torque is due to the joint tissue and not due to the MTU elasticity is important for understanding the human hand controls, and also for designing the next generation of robotic hands.

关键词： Joints Muscles Torque Force Mathematical model Tendons Indexes

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Design of Segmented Boost Constant Voltage Battery Charger Based on Leakage Transformer

Design of Segmented Boost Constant Voltage Battery Charger B...

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robotics, Automation and Intelligent Control (ICRAIC), international conference on

作者： Xiangjin Yin Shidong Li Qinyi Liao Qiaoqiao Xing College of Intelligent Systems Science and Engineering Hubei Minzu University Enshi China

High-power lead-acid batteries are widely used in traction motors, where electric forklifts are active in stationary factories with convenient charging, thus lead-acid storage for forklift motors is widely used. The article uses the characteristic that the output voltage of the leakage transformer increases as the current decreases to discuss the characteristics of lead-acid batteries for forklift motors. It employs the low-voltage constant-voltage charging method in the initial stage to develop an intelligent charging device for traction batteries. This method ensures that the charging current curve closely resembles Mas’s optimal charging curve and addresses the issue of high current at the start of charging, which is caused by the deep discharge of the batteries in the intermittent charging method. Additionally, a capacity estimation method is proposed to complement battery aging and cycle count, reducing the capacity error caused by inaccurate measurement of individual current. The experimental results demonstrate that the designed charger adheres to Mas’s optimal charging curve change pattern when charging the battery’s current and the capacity estimation is a close approximation to the actual battery capacity.

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Research on fronthaul scheme based on DRoF 3

Research on fronthaul scheme based on DRoF

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2021 3rd international conference on robotics, Intelligent Control and Artificial Intelligence, ICRICA 2021

作者： Feng, Chenwei Sun, Yu Su, Youmei Jiang, Fuchun Tao, Lin Ji, Huazhi School of Opto-electronic and Communication Engineering Xiamen University of Technology Xiamen China

With the rapid increase of global data traffic, storage and transmission of massive data is a challenging problem. Therefore, data compression is necessary. Based on DRoF, mobile fronthual has the advantages of high data rate, good connectivity and system capacity, and becomes the key part of communication system transmission. In this paper, an optimized vector quantization data compression algorithm based on DRoF system is proposed, which mainly studies OFDM baseband modulation signals. Firstly, the modulation signal is transformed by DCT. Then the optimized fast-global K-means clustering algorithm is used for quantization to overcome the problem that the original algorithm may choose noise points as the cluster center. Finally, Huffman coding is used to reduce the code length of the quantized data. Simulation results show that the proposed algorithm has good CR and EVM performance within the error tolerance range. It has a high degree of compression and signal recovery. © Published under licence by IOP Publishing Ltd.

关键词： Vector quantization

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