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| 1 | Real-Time Position and Attitude Estimation for Homing and Docking of an Autonomous Underwater Vehicle Based on Bionic Polarized Optical Guidance显示文摘As an important tool for marine exploration, the autonomous underwater vehicle(AUV) must home in and dock at a docking station(DS) to be recharged, repaired, or to exchange information at set intervals. However, the complex and hostile underwater environment makes this process challenging. This study proposes a real-time method based on polarized optical guidance for determining the position and attitude of the AUV relative to its DS. Four polarized artificial underwater landmarks are positioned at the DS, which are recognized by the AUV vision system. Compared with light intensity, the polarization of a light beam is known to be better maintained at greater propagation distances, especially in underwater environments. The proposed method, which is inspired by the ability of marine animals to communicate, calculates the pose parameters in less than 10 ms without any other navigational information. The simulation results reveal that the angle errors are small and the position errors are no more than 0.116 m within 100 m in the coastal ocean. The results of underwater experiments further demonstrate the feasibility of the proposed method, which extends the operating distance of the AUV beyond what is currently possible while maintaining the precision of traditional optical guidance. | CHENG Haoyuan CHU Jinkui ZHANG Ran GUI Xinyuan TIAN Lianbiao | 2020 | Journal of Ocean University of China2020，19，5： | 6 |
| 2 | Mechanical Characterization of Electroplated Ni Films by Micro-tensile Testing显示文摘Mechanical properties of structural materials are particularly important for design,performance realization and reliability analysis of microelectromechanical systems (MEMS). Furthermore,accurate database of mechanical properties at the micro scale can provide indispensable reference for establishing MEMS standard. Electroplated nickel film is one of the most favored structural materials used in MEMS,thus its mechanical properties has been studied for many years. However,the measured values show large scatter in Young's modulus of nickel film. Young's modulus and yield stress of electroplated nickel film are measured by using a micro-tensile testing instrument. The tensile load applied on the specimen is measured by a load cell with accuracy 0.25 mN directly,without additional friction. Through measuring the axial stiffness coefficient of the tensile instrument in situ,the tensile strain of the specimen is obtained by using two-serial spring model. The electroplated nickel films were fabricated from sulfamate baths,and the gauge section is 500 μm long and 10 μm wide nominally,and thickness range between 25 μm and 50 μm. The obtained Young's modulus from tensile testing is 83±6 GPa for nickel specimens electroplated at current density of 20 mA/cm2 and it increases to 124±5 GPa as current density is decreased to 10 mA/cm2. The phenomena are interpreted in terms of porosity of microstructure. The higher current density produced microstucture with low density and high volume fraction of pores,and the microstructure of high porosity corresponds to a lower modulus. The measured values of Young's modulus are consistent with those of calculated from the exponential empirical formula between Young's modulus and porosity. The micro-tensile testing instrument can also be used for mechanical measurement of other MEMS films. | ZHANG Duanqin CHU Jinkui | 2009 | Chinese Journal of Mechanical Engineering2009，22，4： | 3 |
| 3 | Construction and performance test of a novel polarization sensor for navigation显示文摘 | Jinkui Chu Kaichun Zhao Qiang Zhang Tichang Wang | 2008 | Sensors & Actuators: A Physical2008，，1： | 1 |
| 4 | Systemics of Assur groups with multiple joints显示文摘 | CHU Jinkui CAO Weiqing | 1998 | Mechanism and Machine Theory1998，33，8： | 1 |
| 5 | Structural analysis and synthesis of Assur groups with multiple joints显示文摘 | CAO Weiqing CHU Jinkui | 1992 | Chinese Journal of Mechanical Engineering1992，5，1： | 1 |
| 6 | Fourier series representation of the coupler curves of spatial linkages显示文摘 | SUN Jianwei CHU Jinkui | 2010 | Applied Mathematical Modelling2010，34，5： | 1 |
| 7 | A visual attention model for robot object tracking 显示文摘 | CHU Jinkui LI Ronghua LI Qingying | 2010 | International Journal of Automation andComputing(S1476-8186)2010，7，2： | 1 |
| 8 | Numerical atlas method for path generation of spherical four-bar mechanism显示文摘 | CHU Jinkui SUN Jianwei | 2010 | Mechanism and Machine Theory2010，45，6： | 1 |
| 9 | Construction and performance test of a novel polarization sensor for navigation 显示文摘 | CHU Jinkui ZHAO Kaichun ZHANG Qiang | 2008 | Sensors and Aetuators A: Physical(S0924-4247)2008，148，1： | 1 |
| 10 | A novel angle algorithm of polarization sensor for navigation 显示文摘 | ZHAO Kaichun CHU Jinkui WANG Tichang | 2009 | IEEE Transactions on Instrumentation and MeasurementfS0018-9456)2009，58，8： | 1 |
| 11 | Controlled growth fo well-aligned ZnO nanowire arrays using the improved hydrothermal method 显示文摘 | Han Zhitao Li Sisi Chu Jinkui | 2013 | Journal of Semiconductors2013，34，06： | 1 |
| 12 | Numerical atlas method for path generation of spherical four-bar mechanism显示文摘 | Chu jinkui Sun jianwei | 2010 | Mechanism and Machine Theory2010，45，6： | 1 |
| 13 | Identification of isomorphism among kinematic chains and inversions using links adjacent - chain - table显示文摘 | Chu Jinkui Can Weiqin | 1994 | Mech and Mach Theory1994，29，1： | 1 |
| 14 | Structural analysis and synthesis of assur groups with multiple joint显示文摘 | CAO Weiqing CHU Jinkui | 1992 | Chinese Journal of Mechanical Engineering1992，5，1： | 1 |
| 15 | Identification of isomorphism among kinematic chains and inversions using link's adjacent-chain-table 显示文摘 | Chu Jinkui Cao Weiqing | 1994 | Mechanism and Machine Theory1994，29，1： | 1 |
| 16 | Replication of large area nanoimprint stamp with small critical dimension loss显示文摘In this paper,the replication process of large area nanoimprint stamp with small critical dimension(CD) loss was investigated,using the thin residual layer nanoimprint lithography(NIL) technology.The residual layer thickness was optimized by changing the spin-coated resist thickness.The dependences of the residual layer etching rate on gas flow,chamber pressure,and RF power were investigated,and the optimized process conditions were established.By means of the thin residual layer NIL technique and optimized residual layer etching process,large area stamp with small CD loss and multi-orientation patterns was successfully replicated on 2-inch SiO2/Si wafer.The CD loss was controlled within 5 nm.The replicated stamp showed high performance in the patterning with thermal NIL.The replication process reported in this work could also be used to fabricate large area nanostructures with small CD loss. | MENG FanTao GUAN Le WANG ZhiWen HAN ZhiTao CHU JinKui | 2012 | Science China(Technological Sciences)2012，55，3： | 1 |
| 17 | A method for isomorphism identication of the gear train kinematic chains显示文摘 | ZOU Yanhuo CHU Jinkui | 2014 | Journal of Information and Computational Science2014，11，7： | 1 |
| 18 | Structural analysis and synthesis of Assur groups with multiple joints显示文摘 | CAO Weiqing CHU Jinkui | 1992 | Chinese Journal of Mechanical Engineering1992，5，1： | 1 |
| 19 | Large-area ultracompact pixelated aluminumwire-grid-based metamaterials for Vis-NIR full-Stokes polarization imaging显示文摘The study of pixelated metamaterials that integrate both the functions of linear and circular polarization filters is rapidly growing due to the need for full-Stokes polarization imaging. However, there is a lack of large-area, ultracompact pixelated full-Stokes metamaterials with excellent performance, especially circular polarization filters with a high extinction ratio, a broad operating bandwidth, and a low-cost, high-quality, efficient manufacturing process, which limits the practical applications of pixelated full-Stokes metamaterials. In this study, we propose a universal design and fabrication scheme for large-area, ultracompact pixelated aluminum wire-grid-based metamaterials used in Vis-NIR full-Stokes polarization imaging. The aluminum wire-grid was designed as a linear polarization filter with an average linear polarization extinction ratio of 36,000 and a circular polarization filter with an average circular polarization extinction ratio of 110 in Vis-NIR. A large-area, ultracompact 320 × 320pixelated aluminum wire-grid-based full-Stokes metamaterial was fabricated using nanoimprint lithography and nano transfer printing with the advantages of low cost and high efficiency. This metamaterial was used to achieve full-Stokes polarization imaging with errors within 8.77%, 12.58%, 14.04%, and 25.96% for Stokes parameters S_(0), S_(1), S_(2), and S_(3), respectively. The inversion errors of the compensated Stokes parameters can be reduced to0.21%, 0.21%, 0.42%, and 1.96%, respectively. | YUANYI FAN JINKUI CHU RAN ZHANG CHUANLONG GUAN JIANYING LIU | 2023 | Photonics Research2023，11，11： | 0 |
| 20 | Relationship between coupler curve properties of a 4-bar linkage and its dimensional types显示文摘Three types of 4-bar linkages can trace the same coupler curve according to the cognate mechanism law. Based on the investigation of the relationship between dimensions of a linkage and the harmonic component characteristic parameters of the coupler curve of the linkage, it was found that six types of linkages are related to the same coupler curve, and they belong to two groups of cognate mechanisms, in which the coupler curves have the same shape and are symmetric. The relationships among the dimensional types of these six mechanisms are presented. The corresponding examples have also proved these conclusions. This work enriches the cognate mechanism law, and can result in more candidate mechanisms for mechanism dimensional synthesis. | CHU Jinkui WANG Liding WU Chen | 2004 | Science China(Technological Sciences)2004，47，4： | 0 |
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