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Obstacle Avoidance Based on Component Separation-refusion Algorithm for Blind People

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Obstacle Avoidance Based on Component Separation-refusion Al...

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作者： Xinzhen Ren Fulong Yao tianfang zhou Xiaogang Gu Wenju zhou School of Mechatronic Engineering and Automation Shanghai University The Faculty of Engineering Architecture and Information Technology The University Of Queensland

How to guarantee the basic rights and interests of blind people is an urgent problem that needs to be addressed. The visual assistance system for the blind people is a good choice. Obstacle detection in the visual assistance system for blind people is extremely important, however existing obstacle avoidance methods based on machine vision do not consider the impact of shadows in the environment. This paper proposes an obstacle avoidance method based on machine vision, includes an obstacle detection algorithm and a direction planning strategy, to assist blind people to move freely. Firstly, a component separationrefusion algorithm based on the HSV model is proposed to reduce the influence of shadows in the environment. Secondly, an obstacle avoidance method, includes an obstacle detection based on image blocks and a direction planning strategy, is developed to help blind people avoid obstacles both indoors and outsides. Finally, the proposed method is tested under various light intensities and venues, experiments show that this method can effectively help blind people avoid obstacles and improve mobility.

关键词： Obstacle avoidance shadow removal blind people HSV machine vision path planning

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压电单晶双激励宽带纵向换能器

哈尔滨工程大学学报 2018年第9期39卷 1472-1477页

作者：季博成蓝宇周天放哈尔滨工程大学水声工程学院黑龙江哈尔滨150001 哈尔滨工程大学水声技术重点实验室黑龙江哈尔滨150001

为了提高纵向换能器发射响应和工作带宽,本文以压电单晶PMNT做为有源驱动材料,采用双晶堆不同尺寸反相激励的方式,同时激发出一阶、二阶纵振模态,从而提高纵向换能器发射响应,拓宽工作频带。通过四端网络法简化换能器的等效电路并计算... 详细信息

为了提高纵向换能器发射响应和工作带宽,本文以压电单晶PMNT做为有源驱动材料,采用双晶堆不同尺寸反相激励的方式,同时激发出一阶、二阶纵振模态,从而提高纵向换能器发射响应,拓宽工作频带。通过四端网络法简化换能器的等效电路并计算其发射性能,利用ANSYS软件对模型进行优化设计并制作了试验样机,最终测试数据显示在工作频带27~65 k Hz,最大发射电压响应值不低于150 d B,带内起伏小于12 d B。研究结果表明:理论计算、有限元仿真计算与实测结果基本吻合,利用双晶堆反相激励的方式可实现纵向换能器较宽频带工作。

关键词：压电单晶双激励纵向换能器宽带有限元等效电路四端网络法 PMNT 发射响应

LSTM-Based Visibility Detection for Airport Images in Time Series

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LSTM-Based Visibility Detection for Airport Images in Time S...

An Evolutionary Multi-Layer Extreme Learning Machine for Data Clustering Problems

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作者： Xiaofei Han tianfang zhou Yu He Yayu Chen Rongfei Chen Wenju zhou School of Mechanical Engineering and Automation Shanghai University The Faculty of Engineering Architecture and Information Technology The University of Queensland

Atmospheric visibility detection is essential for assuring safety in traffic and aviation. There have been some methods that can indirectly detect visibility by analyzing the images. However, most of these methods ignore the continuous information in the video while getting independent images from the video. It’s also difficult work to defining image features that reflect visibility accurately and comprehensively. To address these issues, this paper proposes a visibility detection method based on image-feature information fusion LSTM（Long Short-Term Memory）. For reducing the complexity of calculation and improve the effect of model training, the key image feature values were extracted into a vector, then the input matrix of the LSTM was composed by these vectors in time series. Experiments demonstrated that our method can focus on the key image features and make full use of continuous information in the video, and thus achieve a satisfying performance invisibility detection.

关键词： LSTM Atmospheric visibility detection Time-series images Feature extraction

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An Evolutionary Multi-Layer Extreme Learning Machine for Dat...

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作者： Xian Wu tianfang zhou Kaixiang Yi Minrui Fei Yayu Chen JiaLan Ding Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronic Engineering and Automation Shanghai University The Faculty of Engineering Architecture and Information Technology The University of Queensland

Clustering technology such as K-means is a critical method in data analysis, and it occupies an even more important place with the explosion of information. Due to the complicated distribution of data in the original feature space, it is difficult to find suitable clusters of the data. To address this problem, Existing extreme learning machines（ELM） based clustering methods construct an embedding space to reveal the clusters more easily. In ELM and K-means, some parameters are randomly assigned,so it may lead to unstable or non-optimal results. In this paper, an evolutionary extreme learning machine method（LBH-MLELM）based on a black hole algorithm is proposed, in which a more effective embedding space is constructed by a multi-layer extreme learning machine, and the final results are subsequently derived by K-means algorithm. What’s more, by optimizing not only the input weights, hidden biases of ELM, but also the initial center of K-means, the accuracy and robustness of clustering are improved. The experimental results on several public datasets demonstrated the effectiveness of the proposed method, and further analyzed the properties of the proposed method.

关键词： Extreme learning machine data clustering black hole algorithm machine learning

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四边型弯张换能器特性研究及宽带设计

声学学报 2016年第6期41卷 843-850页

作者：李宽蓝宇周天放哈尔滨工程大学水声技术重点实验室哈尔滨150001 哈尔滨工程大学水声工程学院哈尔滨150001 中电科海洋信息技术研究院有限公司北京100041

四边型弯张换能器通常工作带宽较窄,为了提高带宽性能,对四边型弯张换能器振动及辐射特性进行了研究,重点分析壳体结构参数对换能器发送电压响应的影响。根据分析结果提出了拓宽换能器工作带宽的方法,利用有限元软件进行了仿真计算并制... 详细信息

四边型弯张换能器通常工作带宽较窄,为了提高带宽性能,对四边型弯张换能器振动及辐射特性进行了研究,重点分析壳体结构参数对换能器发送电压响应的影响。根据分析结果提出了拓宽换能器工作带宽的方法,利用有限元软件进行了仿真计算并制作了四边型弯张换能器样机。测量得到在2.4~5 kHz的频率范围内,换能器的最大发送电压响应值达到140 dB,带内起伏4 dB,有限元仿真结果与实验结果吻合较好。研究结果表明设计的四边型弯张换能器不仅能够低频工作,并且可以在小尺寸下实现大功率发射,同时还具备宽带发射特性。

关键词：电压响应弯曲振动工作带宽谐振频率壳体结构仿真结果模态频率纵振特性分析水听器

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低频弯曲式水听器研究

应用科技 2020年第1期47卷 99-104页

作者：许延峰周天放蓝宇哈尔滨工程大学水声技术重点实验室黑龙江哈尔滨150001 哈尔滨工程大学海洋信息获取与安全重点实验室黑龙江哈尔滨150001 哈尔滨工程大学水声工程学院黑龙江哈尔滨150001

为了实现低频段声波的高灵敏度接收,进行双面三叠片弯曲式水听器的研究。利用COMSOL有限元软件对弯曲式水听器进行仿真和优化设计,分析各个部分对水听器接收灵敏度级的影响,设计出最优方案,并制作试验样机。设计的水听器样机最大尺寸为4... 详细信息

为了实现低频段声波的高灵敏度接收,进行双面三叠片弯曲式水听器的研究。利用COMSOL有限元软件对弯曲式水听器进行仿真和优化设计,分析各个部分对水听器接收灵敏度级的影响,设计出最优方案,并制作试验样机。设计的水听器样机最大尺寸为45 mm,经过水池测试,测得水听器样机在500 Hz^2.5 kHz频带范围内最大接收灵敏度级为-178 dB,起伏小于4 dB,实验结果和仿真结果相同。

关键词：低频小尺寸弯曲式水听器有限元法三叠片高灵敏度压电陶瓷

Microstructure and Wear/corrosion Resistance of Stainless Steel Laser-alloyed with Mn+W_(2)C, Mn+NiWC and Mn+SiC

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 283-294页

作者： zhou Rui DIAO Xiaogang SUN Yixin School of Metallurgical Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600China CITIC Heavy Cast Iron Industry Co. Ltd.Luoyang 417039China

In-situ formed high Mn steel coating reinforced by carbides was formed by laser surface alloying(LSA).Laser alloyed layers on 1Cr18Ni9Ti steel with Mn+W_(2)C(specimen A),Mn+NiWC(specimen B)and Mn+SiC(specimen C)powders were fabricated to improve the wear and corrosion behavior of 1Cr18Ni9Ti steel blades in high speed *** evolution,phases,element distribution,microhardness,wear and corrosion behavior of the laser alloyed layers were *** indicated that high Mn steel matrix composites with undissolved W_(2)C,WC and other in-situ formed carbides were formed by LSA with Mn+W_(2)C and Mn+NiWC while SiC totally dissolved into the high Mn matrix when adding Mn+*** as the binding phase in Ni-WC powder decreased the crack sensitivity of the alloyed layer as compared with the addition of W_(2)C *** improvement in average microhardness was achieved in the matrix in specimen A,B and C,with the value of 615,602 and 277 HV_(0.5),while that of the substrate was 212 HV_(0.5).The increase of microhardness,wear and corrosion resistance is highly corelated to microstructure,formed phases,type and content of carbides,micro-hardness and toughness of the alloyed layers.

关键词： laser surface alloying stainless steel carbide type microstructure wear and corrosion resistance

Distributed fiber optic sensing system for vibration monitoring of 3D printed bridges

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Optoelectronics Letters 2025年第1期21卷 28-34页

作者： ZHAO Shuai zhou Ran LUO Mingming LIU Jianfei LIU Xiongfei zhou Tao School of Electronic Information Engineering Hebei University of Technology Tianjin Key Laboratory of Electronic Materials and Devices School of Civil Engineering and Transportation Hebei University of Technology Tianjin Jinhang Institute of Technical Physics

The fiber optic sensing technology provides data support in structural health monitoring of the macro facilities, including design, construction, and maintenance of bridges, tunnels, ports and other infrastructures. In this paper, a distributed vibration sensing system is proved to be responsive to a single touch over a 1.8-m-long equivalent fiber segment, covering a vibration frequency from 5 Hz to 25 kHz. The sensing fiber was arranged as an S type layout on the bridge to recognize the standing state, windblown disturbance, and walking vibration. Moreover, the knocking and climbing events are recognized fiber laying spinning lines and hanging on the fences, respectively. The demonstration shows an accurate positioning and sensitive vibration monitoring applied on the automated three-dimensional(3D) printed bridge, which is applicable to all kinds of 3D printed facilities as intelligent sensory neuro-networks.

关键词： Spinning (fibers)

Prussian Blue Analogue‑Templated Nanocomposites for Alkali‑Ion Batteries:Progress and Perspective

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Nano-Micro Letters 2025年第1期17卷 216-261页

作者： Jian‑En zhou Yilin Li Xiaoming Lin Jiaye Ye Key Laboratory of Theoretical Chemistry of Environment Ministry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006People’s Republic of China School of Chemistry and Physics Faculty of ScienceQueensland University of Technology2 George StreetBrisbaneQLD 4000Australia Centre for Materials Science Queensland University of Technology2 George StreetBrisbaneQLD 4000Australia

Lithium-ion batteries(LIBs)have dominated the portable electronic and electrochemical energy markets since their commercialisation,whose high cost and lithium scarcity have prompted the development of other alkali-ion batteries(AIBs)including sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).Owing to larger ion sizes of Na^(+)and K^(+)compared with Li^(+),nanocomposites with excellent crystallinity orientation and well-developed porosity show unprecedented potential for advanced lithium/sodium/potassium *** enticing open rigid framework structures,Prussian blue analogues(PBAs)remain promising self-sacrificial templates for the preparation of various nanocomposites,whose appeal originates from the well-retained porous structures and exceptional electrochemical activities after thermal *** review focuses on the recent progress of PBA-derived nanocomposites from their fabrication,lithium/sodium/potassium storage mechanism,and applications in AIBs(LIBs,SIBs,and PIBs).To distinguish various PBA derivatives,the working mechanism and applications of PBA-templated metal oxides,metal chalcogenides,metal phosphides,and other nanocomposites are systematically evaluated,facilitating the establishment of a structure–activity correlation for these *** on the fruitful achievements of PBA-derived nanocomposites,perspectives for their future development are envisioned,aiming to narrow down the gap between laboratory study and industrial reality.

关键词： Prussian blue analogues Self-sacrificial template Lithium-ion batteries Sodium-ion batteries Potassium-ion batteries