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the recent research on virtual prototyping engineering for complex products

The recent research on virtual prototyping engineering for c...

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International conference on Computer Supported Cooperative Work in design

作者： Bo Hu Li Xudong Chai Wenhai Zhu Yanqiang Di Xiao Song Xuefeng Yan Peng Wang Baocun Hou Gouqiang Shi Xiaohua Wang Beijing Aeronautics and Astronautics University Beijing China Beijing Simulation Center Beijing China CS Department Beijing Institute of Technology Beijing China Computer Science & Technology Institute Harbin Institute of Technology Harbin China

ISBN: (纸本)0780379411

In recent years, based on the previous research work, "virtual prototyping engineering for complex product (CPVPE)" project, combined with current technology developments and application requirements, is further studied and practiced. Some latest research results gained are introduced in this work in detail, which include the collaborative simulation grid based system technology for CPVPE, component based collaborative modeling and simulation technology for CPVP (complex product virtual prototype), multidisciplinary design optimization technology for CPVP, collaborative virtual environment technology, collaborative simulation grid platform based supporting environment technology for CPVPE, etc. Furthermore, a tools suit for CPVPE, namely COSIM-grid, developed by authors and their colleagues is presented. At last, some typical cases based on COSIM-grid are also presented.

关键词： Virtual prototyping design engineering Space technology design optimization Collaboration Collaborative work Virtual environment Automotive engineering Systems engineering and theory Collaborative tools

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Low Loss, Large Bandwidth Antiresonant Hollow-Core Fiber design for Short-Reach Links

Low Loss, Large Bandwidth Antiresonant Hollow-Core Fiber Des...

引用

2020 optical Fiber Communications conference and Exhibition, OFC 2020

作者： Shere, William Jasion, Gregory T. Numkam Fokoua, Eric Poletti, Francesco University of Southampton Optoelectronics Research Centre Faculty of Engineering and Physical Sciences United Kingdom

We present antiresonant hollow-core optical fibre designs for VCSEL-based short-reach transmission applications in the 850nm band. Our simulations show that lower loss and twice the bandwidth of solid, multi-mode, gra... 详细信息

ISBN: (纸本)9781943580712

关键词： Bandwidth

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A Novel Online Method for Monitoring the Junction Temperature Based on the Input and Output of the Inverter

A Novel Online Method for Monitoring the Junction Temperatur...

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International Conf on Electrical and Electronic engineering (ICEEE)

作者： Guoqing Xu Huili Wu Zhengyun Pan Weiwei Wei Yanhui Zhang School of Mechatronic Engineering and Automationname Shanghai University Shanghai China Hefei Design and Research Institute of Coal Industry Co. Ltd. Anhui China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China

Junction temperature is an important performance parameter for the operation of power semiconductor devices and it is also one of the main factors leading to device failure. this paper proposes a novel online method for monitoring the junction temperature based on the input and output of the inverter. By obtaining the input and output voltage and current of the inverter, the turn-off transient waveform of each power device can be extracted to calculate the turn-off loss. then the reliability state monitoring of the power device can be realized according to the E_off - I_c- T_j mapping table. Results show that this method can obtain the turn-off loss E_off in each control cycle to predict and monitor the real-time junction temperature T_j of each power device. It has the advantages of easy measurement, non-invasiveness and good applicability.

关键词： Temperature measurement Temperature sensors Temperature distribution Semiconductor device measurement optical variables measurement Inverters Data mining

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Recent developments in magneto-optic garnet-type thin-film materials synthesis

Recent developments in magneto-optic garnet-type thin-film m...

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7th International conference on Materials for Advanced Technologies, ICMAT 2013

作者： Nur-E-Alam, Mohammad Vasiliev, Mikhail Kotov, Viacheslav Alameh, Kamal Electron Science Research Institute Edith Cowan University 270 Joondalup Drive Joondalup WA 6027 Australia Institute of Radio Engineering and Electronics RAS 11 Mohovaya St Moscow 125009 Russia

Magneto-optic (MO) garnets are used in a range of applications in nanophotonics, integrated optics, communications and imaging. Bi-substituted iron garnets of different compositions are the most useful class of materials in applied magnetooptics due to their excellent MO properties (large Faraday effect) and record-high MO figure of merit among all semitransparent dielectrics. It is highly desirable to synthesise garnets which possess simultaneously a high MO figure of merit and large uniaxial magnetic anisotropy. However, the simultaneous optimization of several material properties and parameters can be difficult in single-layer garnet thin films, and it is also challenging to prepare films with high bismuth content using physical vapor deposition technologies. To meet the current challenge of developing next-generation functional MO materials, we design, develop and demonstrate the functionality of new magnetostatically-altered all-garnet multilayer heterostructures using two different garnet materials of dissimilar anisotropy types (out-of-plane and almost-inplane). the multilayer structures possess simultaneously a high MO figure of merit and large uniaxial magnetic anisotropy together with low coercivity, if each of the layers is optimized in composition and annealed correctly. We prepare thin-film heterostructures by sandwiching a MO garnet layer with almost in-plane magnetization in-between two MO garnet layers with out-of-plane magnetization using RF sputtering. We apply customised high-temperature oven annealing processes (optimized in temperature and process durations after running many trials) for the as-deposited (amorphous) garnet multilayers to obtain the crystalline garnet phase in every layer. these structures then possess simultaneously a high optical/MO quality and low coercivity, which is very attractive for the development of magnetic photonic crystals, sensing devices and ultra-fast switches. Based on Bi-substituted ferrite garnets grown on garn

关键词： Magnetos

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design and pre-development of an airborne multi-species differential absorption Lidar system for water vapor and HDO isotope, carbon dioxide, and methane observation

Design and pre-development of an airborne multi-species diff...

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2020 International conference on Space Optics, ICSO 2020

作者： Dherbecourt, J.B. Raybaut, M. Melkonian, J.M. Hamperl, J. Santagata, R. Dalin, M. Lebat, V. Godard, A. Flamant, C. Totems, J. Chazette, P. Pasiskevicius, V. Heinecke, D. Schäfer, H. Strotkamp, M. Geus, J.F. Rapp, S. Sodemann, H. Steen-Larsen, H.C. DPHY ONERA Université ParisSaclay PalaiseauF-91123 France UMR 8190 CNRS-SU-UVSQ Paris France UMR 1572 CEA-CNRSUVSQ Gif-sur-Yvette France Roslagstullsbacken 21 Stockholm10691 Sweden SpaceTech GmbH Seelbachstr. 13 Immenstaad88090 Germany Fraunhofer Institute for Laser Technology Steinbachstr. 15 Aachen52074 Germany InnoLas Laser GmbH Justus-von-Liebig- Ring 8 Krailling82152 Germany Geophysical Institute University of Bergen Bjerknes Centre for Climate Research Bergen Norway

We report on the current design and preliminary developments of the airborne Lidar Emitter and Multi-species greenhouse gases Observation iNstrument (LEMON), which is aiming at probing H2O and its isotope HDO at 1982 nm, CO2 at 2051 nm, and potentially CH4 at 2290 nm, with the Differential Absorption Lidar method (DIAL). the infrared emitter is based on the combination of two Nested Cavity OPOs (NesCOPOs) with a single optical parametric amplifier (OPA) line for high-energy pulse generation. this configuration is enabled by the use of high-aperture periodically poled KTP crystals (PPKTP), which provide efficient amplification in the spectral range of interest around 2 μm with slight temperature adjustments. the parametric stages are pumped with a Nd:YAG laser providing 200 mJ nanosecond double pulses at 75 Hz. According to parametric conversion simulations supported by current laboratory experiments, output energies in the 40 - 50 mJ range are expected in the extracted signal beam whilst maintaining a good beam quality (M2 © 2021 ESA and CNES

关键词： Carbon dioxide

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Mechanical structure design and simulation of multi-physical field integrated pipeline internal inspection detector 4

Mechanical structure design and simulation of multi-physical...

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4th International conference on Mechanical, Electronics, and Electrical and Automation Control, METMS 2024

作者： Huang, Jie Chen, Pengchao Li, Rui Fu, Kuan Wang, Yanan Duan, Jingyao China University of Petroleum Beijing China Pipechina Research Institute Langfang China

ISBN: (数字)9781510679887

ISBN: (纸本)9781510679870

this paper addresses circumferential weld cracking in oil and gas pipelines, a primary form of pipeline failure. To achieve scientific and effective management of the entire process, all regions, and throughout the entire life cycle of the high-grade steel pipeline, a novel multi-physical field ultra-high-definition pipeline comprehensive condition inspection device has been designed and developed. the device incorporates a dual-array structured composite electromagnetic probe, operating at a 5K frequency, to real-time capture magnetic leakage and eddy current signals, enabling the detection of minute defects such as cracks and pinholes in circumferential welds. Additionally, integrated probes for diameter measurement, stress assessment, and orientation evaluation allow for a comprehensive assessment of pipeline deformation, stress, and orientation. Finite Element Analysis is applied to the mechanical structure of the detector to validate its design rationale and safety. Structural strength simulation results indicate that the design of the multi-physical field ultra-high-definition pipeline comprehensive condition inspection device is reasonable, enabling it to undertake inspection tasks for large-diameter, high-grade, high-pressure, long-distance pipelines with pressures ranging from 8 to 12 MPa. this device fills a technological gap in both domestic and international markets for the composite detection of minute defects in large-diameter, high-grade pipelines. © 2024 SPIE.

关键词： Inspection

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Low loss, large bandwidth antiresonant hollow-core fiber design for short-reach links

Low loss, large bandwidth antiresonant hollow-core fiber des...

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optical Fiber Communication conference, OFC 2020

作者： Shere, William Jasion, Gregory T. Fokoua, Eric Numkam Poletti, Francesco Optoelectronics Research Centre Faculty of Engineering and Physical Sciences University of Southampton United Kingdom

ISBN: (数字)9781943580712

ISBN: (纸本)9781943580712

关键词： Bandwidth

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Research on an optical system based on multi-camera imaging for TFT-LCD module defect detection

Research on an optical system based on multi-camera imaging ...

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IEEE Information Technology and Mechatronics engineering conference (ITOEC)

作者： Hangrui Yan Zhiyong Xiong Guiyang Yang Shaokun Li Department of Mechanical Automation School of Mechanical and Engineering Wuhan University of Engineering Science Wuhan China Wuhan Zhongguan Automation Technology Co. Ltd Wuhan China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan China

In order to detect the defects of TFT LCD screens automatically, an optical system based on multi-camera imaging was established. the structure of TFT-LCD module and the causes of defects were analyzed, and different optical modules were designed to detect different types of defects. then, according to the inspection requirements, the optical analysis and design selection were carried out. Finally, the trend chart of detection curve of TFT-LCD module defect detection system in actual production line was given. the experimental results show that for TFT-LCD screens of mobile phone with 3-8 inches and HD, FHD or 2K resolution, the comprehensive misdetection rate of the proposed detection system is 0.88% and the inspection rate is 7.89%, which can meet the defect detection requirements of TFT-LCD modules on the current production line.

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980 nm InGaAs/AlGaAs quantum well lasers with extremely low beam divergence

980 nm InGaAs/AlGaAs quantum well lasers with extremely low ...

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IEEE International Semiconductor Laser conference

作者： Shun-Tung Yen Gray Lin Der-Cherng Liu Chia-Ming Tsai Chien-Ping Lee Department of Electronics Engineering National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)078033163X

We report on the fabrication of 980 nm InGaAs-AlGaAs lasers with a specially designed cladding structure. For a 2.5 /spl mu/m wide ridge waveguide structure, the far field pattern has a vertical divergence of only 13/spl deg/ and a lateral divergence of 8/spl deg/. Meanwhile, the threshold current can remain acceptably low. In addition, with another design, a record small vertical far field angle of 11/spl deg/ was obtained.

关键词： Indium gallium arsenide Quantum well lasers Laser beams threshold current Waveguide lasers optical design Fiber lasers Pump lasers optical waveguides Laser theory

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Lightweight person re-Identification model employing symmetrical combination units

Lightweight person re-Identification model employing symmetr...

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2023 International conference on Algorithm, Imaging Processing, and Machine Vision, AIPMV 2023

作者： Cai, Dawei Tang, Qingwei Shenzhen Sunwin Intelligent Co. Ltd A101-15th Floor Saiwei Building No. 8 Lianli East Road Xiaolilang Community Nanwan Street Longgang District Shenzhen China Anhui Jianzhu University School of Electronic and Information Engineering Electronic Information No. 292 Ziyun Road Economic and Technological Development Zone AnHui Hefei230601 China

ISBN: (纸本)9781510672444

As an image retrieval problem, person re-identification (Re-ID) relies on robust features extracted by convolution neural models. Most current methods use large backbone models for feature extraction (e.g., ResNet50). However, these large backbone models have many parameters, which cause many problems when embedded in smart camera devices. For example, the device's computing resources are limited, the real-time operation speed is limited, etc. So it is necessary to construct models with low parameters and low complexity. this paper proposes a new lightweight baseline for Re-ID, which is SCL-net and all underlying modules of the model are reconstructed. In our work, we design a new convolution unit-symmetrical combination units (SC-unit), which construct features map of richer channels by reusing feature maps from different convolution layers. In addition, we redesigned all the base modules of SCL-net and proved the effectiveness of all modules. We joint training of shallow and deep features of the model respectively to improve the accuracy of the model. Our SCL-net has about 2.3M parameters, and it can achieve 95.2%/85.9% on Rank-1 and mAP without any pre-training. © 2024 SPIE.

关键词： Convolution

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