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SSRN 2020年

作者： Wen, Yaojie Zhang, Baicheng Narayan, Ramasubramanian Lakshmi Wang, Pei Xu, Song Zhao, Hao Ramamurty, Upadrasta Qu, Xuanhui Beijing Advanced Innovation Center Materials Genome Engineering Beijing100083 China Advanced Material & Technology Institute University of Science and Technology Beijing Beijing100083 China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing100083 China Department of Materials Science and Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India IMRE - Institute of Materials Research and Engineering 2 Fusionopolis Way Innovis #08-03 Singapore138634 Singapore Department of Mechanical and Automation Engineering The Chinese University of Hong Kong 3DPTek Co. Ltd. Beijing China School of Mechanical & Aerospace Engineering Nanyang Technological University Singapore

A method for the additive manufacturing of compositionally graded alloys (CGAs) using selective laser melting (SLM) was devised and demonstrated by producing CoCrMo-Nickel based superalloy CGA coupons that are defect-free and with smooth end-to-end variations in the composition and microstructures. The variations in the tensile properties and hardness, measured using high throughput characterization techniques, were rationalized by recourse to the different phases present in the microstructures. The method has the potential to be extended to other material combinations for creating high quality CGA components. © 2020, The Authors. All rights reserved.

关键词： Selective laser melting

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Decision-Making in Driver-automation Shared Control: A Review and Perspectives

arXiv

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arXiv 2020年

作者： Wang, Wenshuo Na, Xiaoxiang Cao, Dongpu Gong, Jianwei Xi, Junqiang Xing, Yang Wang, Fei-Yue CA94720 United States Department of Engineering University of Cambridge Trumpington Street CambridgeCB2 1PZ United Kingdom Mechanical and Mechatronics Engineering University of Waterloo 200 University Ave. West Waterloo ONN2L3G1 Canada Department of Mechanical Engineering Beijing Institute of Technology Beijing100081 China School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore639798 Singapore State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100190 China Research Center for Military Computational Experiments and Parallel Systems Technology National University of Defense Technology Changsha410073 China

Shared control schemes allow a human driver to work with an automated driving agent in driver-vehicle systems while retaining the driver’s abilities to control. The human driver, as an essential agent in the driver-vehicle shared control systems, should be precisely modeled regarding their cognitive processes, control strategies, and decision-making processes. The interactive strategy design between drivers and automated driving agents brings an excellent challenge for human-centric driver assistance systems due to the inherent characteristics of humans. Many open-ended questions arise, such as what proper role of human drivers should act in a shared control scheme? How to make an intelligent decision capable of balancing the benefits of agents in shared control systems? Due to the advent of these attentions and questions, it is desirable to present a survey on the decision-making between human drivers and highly automated vehicles, to understand their architectures, human driver modeling, and interaction strategies under the driver-vehicle shared schemes. Finally, we give a further discussion on the key future challenges and opportunities. They are likely to shape new potential research directions. Copyright © 2020, The Authors. All rights reserved.

关键词： Decision making

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research on the grey correlation analysis of the norm in choosing key factors of aero-engine design integration system 3

Research on the grey correlation analysis of the norm in cho...

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3rd International Conference on Circuits and systems, CAS 2018

作者： He, Ying Xiu, Rui School of Mechanical Engineering and Automation Beihang University Beijing China AECC Hunan Aviation Power Plant Research Institute Zhuzhou China Beijing Institute of Aerospace Control Instrument Beijing China

The key influencing factor of accurate positioning aerospace design integration system is the basis of successful construction of design architecture integration platform. Normal grey relational analysis has better approximation than general grey relational analysis. The article analyses the effects of grey correlation analysis and aero-engine design integration system, and then based on t norm grey correlation analysis, determine the key influence factors of aerospace design integration system, a more true and accurate result is obtained. © 2018 The Authors, published by EDP Sciences.

关键词： Correlation methods

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Gradient piezoelectric composites for ultrasonic transducer design and imaging applications

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Journal of Materiomics 2025年第6期11卷

作者： Chenxue Hou Zhaoxi Li Chunlong Fei Qibo Lin Xiaofei Luo Xiongwei Wei Yiheng Yang Qi Lu Yi Quan Guangzhi Dong Zeyu Chen Xiaozhou Lü Weimin Bao Yintang Yang Shaanxi Provincial Key Laboratory of Integrated Circuit and System Integration Faculty of Integrated Circuit Xidian University Xi'an 710071 China The State Key Laboratory of Analog and Mixed-Signal VLSl Institute of Microelectronics University of Macau Macao 999078 China School of Aerospace Science and Technology Xidian University Xi'an 710071 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical Engineering Central South University Changsha 410083 China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 China Hunan Province University Key Laboratory of Intelligent Testing and Control Technology for Engineering Equipment Changsha 410114 China School of Advanced Materials and Nanotechnology Xidian University Xi'an 710126 China Furong Laboratory (Precision Medicine) Changsha 410008 China National Engineering Research Center of Personalized Diagnostic and Therapeutic Technology Xiangya Hospital Central South University Changsha 410008 China Hunan Engineering Research Center of Skin Health and Disease Xiangya Hospital Central South University Changsha 410008 China

Ultrasonic imaging technology has advanced rapidly, the escalating demand for imaging quality has driven the continuous development of ultrasonic transducers featuring high-performance. Among them, the crucial factors constraining the further enhancement of imaging quality are the frequency of the device and the intensity of the echo signal. Piezoelectric composites have become a hotspot for ultrasonic transducers and imaging applications due to their excellent properties. However, due to the limitations of the accuracy of the cutting process, the development of piezoelectric/polymer composites is often undermined by undesirable pseudo-vibrations, especially in high-frequency applications, which will significantly reduce energy conversion efficiency. In this study, a novel design method of 1–3 piezoelectric composites with gradient nanoparticle doped polymer is proposed to eliminate the undesired lateral vibrations. Based on the optimized composites, a high-performance composite ultrasonic transducer with a center frequency of 8.51 MHz is prepared. Compared with the traditional composite transducer, the optimized transducer improves the echo voltage amplitude significantly, reaching nearly 3 times. The above advantages are further verified in high-quality ultrasound and photoacoustic imaging. The optimization method has valuable guidance for the design of high-frequency composite transducers, which have great potential in ultrasonic and photoacoustic imaging applications.

关键词： Piezoelectric composites Ultrasonic transducer Imaging applications Lateral vibration Finite element analysis

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High-density implantable neural electrodes and chips for massive neural recordings

Brain‐X

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Brain‐X 2024年第2期2卷

作者： Longchun Wang Yanxing Suo Jiahao Wang Xuanqi Wang Kai Xue Jingjing An Xun Sun Qinyu Chen Xiaochen Tang Yang Zhao Bowen Ji Jingquan Liu Department of Micro/Nano Electronics Shanghai Jiao Tong University Shanghai China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Shanghai Jiao Tong University Shanghai China DCI Joint Team Collaborative Innovation Center of IFSA Shanghai Jiao Tong University Shanghai China Unmanned System Research Institute Northwestern Polytechnical University Xi'an Shaanxi China National Key Laboratory of Unmanned Aerial Vehicle Technology Xi'an Shaanxi China Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical Engineering Northwestern Polytechnical University Xi'an Shaanxi China Institute of Guizhou Aerospace Measuring and Testing Technology Guiyang Guizhou China Leiden Institute of Advanced Computer Science (LIACS) Leiden University Leiden The Netherlands Klipsch School of Electrical and Computer Engineering New Mexico State University Las Cruces New Mexico USA Yang Zhao Bowen Ji and Jingquan Liu.

High-density neural recordings with superior spatiotemporal resolution powerfully unveil cellular-scale neural communication, showing great promise in neural science, translational medicine, and clinical applications. To achieve such, many design and fabrication innovations enhanced the electrode, chip, or both for biocompatibility improvement, electrical performance upgrade, and size miniaturization, offering several thousands of recording sites. However, an enormous gap exists along the trajectory toward billions of recording sites for brain scale resolution, posing many more design challenges. This review tries to find possible insight into mitigating the gap by discussing the latest progress in high-density electrodes and chips for neural recordings. It emphasizes the design, fabrication, bonding techniques, and in vivo performance optimization of high-density electrodes. It discusses the promising opportunities for circuit-level and architecture-level multi-channel chip design innovations. We expect that joint effort and close collaboration between high-density electrodes and chips will pave the way to high-resolution neural recording tools supporting cutting-edge neuroscience discoveries and applications.

关键词： brain-computer interface massive neural recording high density implantable electrodes implantable chips

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Flying Cyborg: A New Approach for the Study of Coleoptera's Flight Pitching

Flying Cyborg: A New Approach for the Study of Coleoptera's ...

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IEEE International Conference on Cyborg and Bionic systems (CBS)

作者： Yao Li Ying Hu Shinjiro Umezu Hirotaka Sato School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen PR China Laboratory of Minimally Invasive Surgical Robotics and System Shenzhen Insititutes of Advanced Technology Chinese Academy of Sciences Shenzhen PR China Waseda University Tokyo Japan School of Mechanical & Aerospace Engineering Nanyang Technological University Singapore

ISBN: (数字)9781728150734

ISBN: (纸本)9781728150741

The study of flight orientation has gained more and more attention. In this study, we demonstrated a cyborg beetle for measuring body orientations in free flight, which contained a living insect platform and a miniature backpack with micro battery. While flying in a large flight chamber, the flight status of cyborg beetle could be recorded remotely. Thereafter, the effect of pitching on flight control was analyzed. According to the recorded flight data, a strong linear relationship was revealed between the pitch angles and forward accelerations, which was quantified by the Pearson's correlation coefficients and the fitting of mean forward accelerations under each pitch angle. We believe the coupling of pitch angle and forward acceleration is generated by tilted net aerodynamic force and flight air drag. The achievement of the orientation analysis would inspire a new approach to control system design of flying cyborgs and flapping-wing micro air vehicles (MAVs).

关键词：

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Analysis of Harmonics Detection and their Filtration by using Active Band Pass Filter for Domestic Appliances

Analysis of Harmonics Detection and their Filtration by usin...

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IEEE International Conference on automation Science and engineering (CASE)

作者： Ehtisham Lodhi Zeeshan Lodhi Zhu Fenghua Gang Xiong Feiyue Wang Waheed ur Rehman Tariku Sinshaw The SKL for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Department of Electrical and Computer Engineering COMSATS University Islamabad Abbottabad Campus Pakistan Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan Guangdong China Beijing Engineering Research Center of Intellectual System and Technology Chinese Academy of Sciences Beijing China College of Mechanical Engineering and Applied Electronics Technologies Beijing University of Technology Beijing China

ISBN: (数字)9781728169040

ISBN: (纸本)9781728169057

In modern era, one of the rising power quality (PQ) concern is harmonics distortion (HD). The HD is usually produced by increase in the utilization of nonlinear user loads at domestic level. It not only spoils the PQ but also have harmful effects on electrical appliances. So, this paper presents a new approach to mitigate the HD in home appliances rapidly by utilizing the active band pass filter (ABPF). The fast Fourier transform (FFT) technique is employed for the detection of harmonics in appliances. The band pass filter dramatically affects the response time of active filter. The suggested control methodology is capable to eliminate harmonics from distorted input voltage waveform and provides a pure sinusoidal waveform. The prototype of this model is also implemented. Experimental results along with simulation show that the proposed model is quite effective in eliminating HD despite load variations and also useful to compensate the reactive power in electronic home appliances. Hence, this technique is cost effective for domestic users with high quality performance in all aspects.

关键词： Power harmonic filters Harmonic analysis Band-pass filters Harmonic distortion Home appliances

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Loosely-Coupled INS/Vision based Absolute Navigation with Adaptive Kalman Filter

Loosely-Coupled INS/Vision based Absolute Navigation with Ad...

引用

International Conference on Control, automation and systems ( ICCAS)

作者： Sung Hyuk Choi Chan Gook Park Department of Mechanical and Aerospace Engineering Seoul National University Seoul Korea Department of Mechanical Engineering Seoul National University/Automation and System Research Institute Seoul Korea

ISBN: (纸本)9781538670804;9788993215168

We represent adaptive Kalman filter which combines advantages of fast output inertial navigation and slow image based absolute navigation algorithm. In the feature matching process of the scene-matching algorithm, the outliers occasionally occur, resulting in the problem that the state variables of the Kalman filter diverge due to the mismatched improper navigation results. Since this can lead to a very dangerous situation in the navigation system, we propose an adaptive Kalman filter algorithm to solve this problem. The proposed algorithm uses the residual, which is the difference between the measured value and the model, as a judgment variable and does not use the measured value when the threshold value is exceeded. The performance of the proposed algorithm is verified by using flight data.

关键词： Navigation Kalman filters Position measurement Databases Cameras Feature extraction Measurement uncertainty

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A lightweight soft exoskeleton in lower limb assistance

A lightweight soft exoskeleton in lower limb assistance

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Chinese automation Congress (CAC)

作者： Yu Zhang Zhuo Wang Chunjie Chen Tao Fang Ruimei Sun Yanjie Li School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen China Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology Shenzhen China ShenZhen College of Advanced Technology University of Chinese Academy of Sciences Shenzhen China BeiJing Aerospace Wanyuan Science Technology Co. Ltd. Beijing China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

The soft exoskeleton is a wearable robot which is functioned to improve the capacity of human walking or loading. The metabolic of human is increase with the additional load, one integrated design method is used to reduce this effect in this paper. Meanwhile, in order to enhance the convenience and decrease the disturbance to wearer, the wireless module is used to replace the signal line. The nonlinear characteristics and uncertainty of flexible material make the control of soft exoskeleton system be a challenge, a switching controller is proposed to deal with this problem in this paper. It consists of Iterative learning control (ILC) based stable controller and admittance control based unstable controller, functioned with wearers walking stable and not. An experiment of force tracking is conducted to verify the controller performance in this paper, and the result demonstrate that the tracking is well after 20 iteration. In order to evaluate the performance of assistance of soft exoskeleton, five health adult male take part in metabolic experiment By compare the metabolic rate between the wear soft exoskeleton and not wear, the metabolic rate are decrease 7.33%, 14.56% and 10.45% with the walking speed of 3km/h, 5km/h and 7km/h, which are corresponding absolute values decrease of 0.46W/kg, 1.60W/kg and 1.21W/kg respectively.

关键词： AC motors mechanical cables Wireless communication Pulleys Microprocessors Micromechanical devices Germanium

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Model Predictive Control of a Multi-Rotor with a Suspended Load for Avoiding Obstacles

Model Predictive Control of a Multi-Rotor with a Suspended L...

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IEEE International Conference on Robotics and automation

作者： Clark Youngdong Son Hoseong Seo Taewan Kim H. Jin Kim Department of Mechanical and Aerospace Engineering and Automation and Systems Research Institute (ASRI) Seoul South Korea

This paper investigates a multi-rotor with a suspended load in perspectives of 1) real-time path planning, 2) obstacle avoidance, and 3) transportation of a suspended object. A suspended load cannot be controlled with conventional controllers designed for nominal multi-rotors due to the dynamic coupling between the multi-rotor and load. Although several control and planning algorithms have been proposed based on elaborately derived dynamic equations, most existing studies separate control and path planning problems by following predefined trajectories after trajectory generation. Moreover, many state-of-the-art trajectory generation algorithms cannot work real-time for a system with high degrees of freedom, which makes it not suitable to operate the system in dynamic environments where obstacles appear abruptly or move unexpectedly. With this in mind, we apply Model Predictive Control (MPC) with Sequential Linear Quadratic (SLQ) solver to compute feasible and optimal trajectory real-time and to operate a multi-rotor with a suspended load in dynamic environments. We design an obstacle-avoidance algorithm suitable for the current platform flying in cluttered environments. Flight experiments shows that the proposed algorithm successfully controls the multi-rotor and allows to avoid obstacles simultaneously.

关键词： Heuristic algorithms Trajectory Cost function Mathematical model Vehicle dynamics Load modeling Computational modeling

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