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学者姓名：钟剑锋
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Abstract ：
Bistable composite cylindrical structures have been developed over the last four decades, and show great potential for shape morphing applications, especially in aerospace. Their bistabilities are known to be induced by unsymmetric composite layups, while the governing factors on shape geometries and viscoelastic mechanics remain an enigma. Here, we investigated the intricate relationship between structural geometry and stable mechanics of a bistable unsymmetric composite cylindrical structure. A polylactic acid (PLA)-based carbon composite laminate was prepared through 3D printing, which released design freedom on structural fiber volume fraction that could be controlled by modulating hatch spacing between the composite yarns. This strategic adjustment allowed the regulation of grid density, hence the in-plane stress level, which dominates the bistable geometries. The cylindrical composite samples were produced with hatch spacing changed from 1.25 to 5 mm, corresponding to a fiber volume fraction ranged from 24.2% to 6.6%, where the structural curvature was also changed by up to 50% difference and gradually became viscoelastic dependent. It is found that the internal stress difference in thickness direction dominates the structural bistability, and there is a threshold value on the stress difference magnitude to essentially maintain the bistable configurations. These findings are expected to facilitate reversed structural design and manufacturing of the bistable cylindrical shells with tailorable stability, and promote their viscoelastic-based large shape morphing fatigue life predictions.Highlights Bistable composite cylindrical shells were produced with various grid density. A theoretical model was established to predict the time-dependent bistability. Stress difference in thickness direction dominates the structural curvature. Stress contour reveals the viscoelastic-dependent bistable mechanics.
Keyword ：
analytical modeling analytical modeling multifunctional composites multifunctional composites residual/internal stress residual/internal stress viscoelastic mechanics viscoelastic mechanics
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| GB/T 7714 | Wang, Bing , Ye, Junjie , Zhang, Shunnan et al. Viscoelastic mechanics of a bistable composite cylindrical structure [J]. | POLYMER COMPOSITES , 2025 . |
| MLA | Wang, Bing et al. "Viscoelastic mechanics of a bistable composite cylindrical structure" . | POLYMER COMPOSITES (2025) . |
| APA | Wang, Bing , Ye, Junjie , Zhang, Shunnan , Guan, Chenglong , Zhong, Jianfeng , Zhong, Shuncong . Viscoelastic mechanics of a bistable composite cylindrical structure . | POLYMER COMPOSITES , 2025 . |
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Accurate rotational speed measurement is a prerequisite for realizing the condition monitoring and fault diagnosis of rotating equipment. This study proposes a novel rotational speed measurement method based on optical coherent displacement measurement. An optical coherence system is used to measure the relative depth of the shaft surface with uniformly etched micro-indentations on the circumferential surface. Fast Fourier transform (FFT) and the Hanning window energy centrobaric method (HnWECM) are used to process the collected photoelectric signals to obtain depth information and thereby realize the measurement of surface microindentations. During the operation, the rotational speed of the shaft is obtained by calculating the ratio of the angular difference between the relative depth of the rectangular pulses of the surface and the time interval. The experimental validation of the response is performed. The experimental results show that in the range of 0 rpm to 60 rpm, the indication error is <1 %, the nonlinearity error is <0.3584 %, and the repeatability error is <0.28 %. In the range of 0 rpm to 600 rpm, the rotational speed measurement method performed well with an indication error of <0.5 %, a maximum nonlinear error of 0.22 %, and a repeatability error of no >0.28 %. Compared with the results reported in existing literature, the proposed method offers advantages in terms of accuracy, linearity, and repeatability.
Keyword ：
FFT FFT Hanning window Hanning window Micro-indentation Micro-indentation Optical measurement Optical measurement Rotational speed measurement Rotational speed measurement
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| GB/T 7714 | Liang, Wei , Hong, Xiaodong , Huang, Dichang et al. Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system [J]. | OPTICS AND LASERS IN ENGINEERING , 2025 , 184 . |
| MLA | Liang, Wei et al. "Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system" . | OPTICS AND LASERS IN ENGINEERING 184 (2025) . |
| APA | Liang, Wei , Hong, Xiaodong , Huang, Dichang , Chen, Linnan , Zhong, Jianfeng , Zhang, Qiukun et al. Novel rotational speed measuring method based on micro-indentation-shaft detected by optical coherent system . | OPTICS AND LASERS IN ENGINEERING , 2025 , 184 . |
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A bistable composite tape-spring (CTS) structure is a thin-walled open slit tube with fibres oriented at +/- 45 degrees, which is stable at both the extended and fully coiled configurations. Owning to its positive Gaussian curvature deformation mechanics and high stowage-to-pack ratio, it has been successfully applied and launched to International Space Station and microsatellites to construct deployable solar sails. Intelligent driving designs of the CTS-based deployable structures are becoming more and more important to further reduce weight and complexities for space applications. Here, we presented novel findings on the passive thermal driving mechanics of the bistable CTS structure. This is achieved by exploring the thermal energy-induced microstructural expansion and contraction, which would change the structural curvature, and thus regulating the strain energy within the CTS. An analytical model on the strain energy evolution under thermal effects was established to predict the minimum stable shape transition paths, as well as to determine the critical boundary conditions for thermal driving. Both experiments and finite element model were then carried out to reveal underlying mechanisms. It is found that a CTS is able to be passively deployed under thermal energy, there is a minimum energy constraint to initiate the shape morphing process, and the critical boundaries are dependent on the thermal expansion of the structural material. These findings provide a novel low cost, simple and reversed smart morphing design principle of the CTS structure, enriching the theoretical analysis and deployable control of the bistable composites to benefit future deep space explorations.
Keyword ：
Bistable Bistable Composite Composite Mechanism Mechanism Strain energy Strain energy Thermal driving Thermal driving
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| GB/T 7714 | Peng, Yulin , Zhu, Juncheng , Wang, Bing et al. Passive thermal driving mechanics of a bistable composite tape-spring [J]. | THIN-WALLED STRUCTURES , 2025 , 210 . |
| MLA | Peng, Yulin et al. "Passive thermal driving mechanics of a bistable composite tape-spring" . | THIN-WALLED STRUCTURES 210 (2025) . |
| APA | Peng, Yulin , Zhu, Juncheng , Wang, Bing , Guan, Chenglong , Zhong, Jianfeng , Zhong, Shuncong . Passive thermal driving mechanics of a bistable composite tape-spring . | THIN-WALLED STRUCTURES , 2025 , 210 . |
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This article proposes an instantaneous rotational speed (IRS) sensing method that utilizes a circumferential constant-density-sine fringe pattern (CCDSFP) captured by a linear array sensor (LAS). A novel mathematical imaging model has been established to develop a mapping relationship between the correlation coefficient (CC) value of adjacent frame fringe signals and the IRS. The influence of various factors on the sensing performance was thoroughly investigated through simulations and experiments. The results indicate that this method demonstrates satisfactory measurement accuracy within the measurement range from 0 r/min to the maximum measurable rotation speed. The innovation of this method lies in using only a single line of fringe signal captured by LAS for sensing the rotation speed, which offers significant advantages in rotation speed sensing and computational efficiency compared to the area-array camera-based method. Moreover, the new speed encoding and estimation methods exhibit very high sensitivity and accuracy for very low and high rotation speeds. Compared to encoders based on pulse counting during a unit time or time interval estimation between two pulses, the proposed method provides higher temporal resolution and angular resolution for rotation speed measurement. Furthermore, this novel sensing method offers a nonintrusive approach that has no additional mass effect on the shaft, and it could be used for the development of a new kind of IRS sensor.
Keyword ：
Accuracy Accuracy Cameras Cameras Circumferential constant-density-sine fringe pattern (CCDSFP) Circumferential constant-density-sine fringe pattern (CCDSFP) correlation coefficient (CC) correlation coefficient (CC) instantaneous rotational speed (IRS) instantaneous rotational speed (IRS) Optical imaging Optical imaging Optical sensors Optical sensors Optical variables measurement Optical variables measurement Rotation measurement Rotation measurement Shafts Shafts Temperature measurement Temperature measurement Velocity control Velocity control vision-based measurement vision-based measurement Visualization Visualization
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| GB/T 7714 | Zhong, Jianfeng , Chi, Shoujiang , Liu, Dongming et al. Instantaneous Rotational Speed-Sensing Method Using Circumferential Constant-Density-Sine Fringe Pattern [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2025 , 74 . |
| MLA | Zhong, Jianfeng et al. "Instantaneous Rotational Speed-Sensing Method Using Circumferential Constant-Density-Sine Fringe Pattern" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 74 (2025) . |
| APA | Zhong, Jianfeng , Chi, Shoujiang , Liu, Dongming , Feng, Bin , Zhong, Shuncong . Instantaneous Rotational Speed-Sensing Method Using Circumferential Constant-Density-Sine Fringe Pattern . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2025 , 74 . |
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A bolt loosening detection method based on the summation coefficient of the absolute spectrum ratio technique is proposed to address the prevalent issue of bolt loosening in mechanical connections. This proposed method involves initially collecting vibration and rotation speed signals of the motor bolt connection structure, acquiring the baseline spectrum curve of a healthy structure and the spectrum curves of non-healthy structures under different degrees of bolt looseness through chirp Fourier transform (CFT). Subsequently, the spectrum ratio curves between healthy and non-healthy structures are calculated for different degrees of bolt loosening, and then the Summation Coefficient of Absolute Spectrum Ratio (SCASR) is defined to indicate the looseness. In the mathematical model, a linear relationship is observed between the SCASR and the frequency shift of the resonance peak. To standardize the results of bolt loosening detection, the SCASR could be divided by the number of points in the fixed frequency band to obtain the average of SCASR as the detection index for bolt loosening. Finally, a linear fitting equation is established between the bolt torque and the average of SCASR, so that the change in the average value can be used to determine whether the bolt is loose and evaluate the severity of bolt looseness. The detection performance of this proposed method has been effectively validated through both simulation and experiments. Experimental results indicate that the proposed method can effectively detect bolt loosening, particularly in its early stages, using low-frequency band data in three axes.
Keyword ：
chirp Fourier transform chirp Fourier transform detection index for bolt loosening degree detection index for bolt loosening degree early stage of bolt loosening early stage of bolt loosening reference spectrum curve reference spectrum curve Summation Coefficient of Absolute Spectrum Ratio Summation Coefficient of Absolute Spectrum Ratio
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| GB/T 7714 | Guo, Haoyang , Zhong, Jianfeng , Feng, Bin et al. Detection Method for Bolt Loosening Based on Summation Coefficient of Absolute Spectrum Ratio [J]. | SENSORS , 2025 , 25 (1) . |
| MLA | Guo, Haoyang et al. "Detection Method for Bolt Loosening Based on Summation Coefficient of Absolute Spectrum Ratio" . | SENSORS 25 . 1 (2025) . |
| APA | Guo, Haoyang , Zhong, Jianfeng , Feng, Bin , Chen, Yulong , Zhong, Shuncong . Detection Method for Bolt Loosening Based on Summation Coefficient of Absolute Spectrum Ratio . | SENSORS , 2025 , 25 (1) . |
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This paper explores the application of multidisciplinary design optimization to the blades in horizontal-axis wind turbines. The aerodynamics and structural performance of blades are considered in the optimization framework. In the aerodynamic discipline, class function/shape function transformation-based parameterized modeling is used to express the airfoil. The Wilson method is employed to obtain the aerodynamic shape of the blade. Computational fluid dynamics numerical simulation is performed to analyze the aerodynamics of the blade. In the structural discipline, the materials and ply lay-up design are studied. Finite element method-based modal analysis and static structural analysis are conducted to verify the structural design of the blade. A collaborative optimization framework is set up on the Isight platform, employing a genetic algorithm to find the optimal solution for the blade's aerodynamics and structural properties. In the optimization framework, the design variables refer to the length of the blade chord, twist angle, and lay-up thickness. Additionally, Kriging surrogate models are constructed to reduce the numerical simulation time required during optimization. An optimal Latin hypercube sampling method-based experimental design is employed to determine the samples used in the surrogate models. The optimized blade exhibits improved performance in both the aerodynamic and the structural disciplines.
Keyword ：
aerodynamic characteristics aerodynamic characteristics multidisciplinary design optimization multidisciplinary design optimization numerical simulation numerical simulation structural characteristics structural characteristics wind turbine blades wind turbine blades
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| GB/T 7714 | He, Fushan , Zheng, Xingsheng , Luo, Weilin et al. Collaborative Optimization of Aerodynamics and Wind Turbine Blades [J]. | APPLIED SCIENCES-BASEL , 2025 , 15 (2) . |
| MLA | He, Fushan et al. "Collaborative Optimization of Aerodynamics and Wind Turbine Blades" . | APPLIED SCIENCES-BASEL 15 . 2 (2025) . |
| APA | He, Fushan , Zheng, Xingsheng , Luo, Weilin , Zhong, Jianfeng , Huang, Yunhua , Ye, Aili et al. Collaborative Optimization of Aerodynamics and Wind Turbine Blades . | APPLIED SCIENCES-BASEL , 2025 , 15 (2) . |
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Meta-learning has been widely applied and achieved certain results in few-shot cross-domain fault diagnosis due to its powerful generalization and robustness. However, existing meta-learning methods mainly focus on cross-domain fault diagnosis within the same machine, ignoring the fact that there are more significant domain distribution differences and sample imbalance problems between different machines, leading to poor diagnostic performance. This paper proposes a semi-supervised prototypical network with dual correction to address these issues. First, a dual-channel residual network is utilized to comprehensively extract sample features, capturing deep and shallow information. Then, correct the semi-supervised prototypical network by weighting the features and adding a shift term on support set samples and query set samples, respectively, to diminish its intra-class and extra-class bias. Meanwhile, a regularization term is introduced into the model to balance the distribution among different class prototypes, enhancing distinctiveness. Finally, few-shot cross-machine fault diagnosis experiments are conducted on three datasets to validate the method's effectiveness. Additionally, an interpretability analysis of the model is conducted using the gradient-weighted class activation mapping (Grad-CAM) technique to discern its primary regions of focus in the classification tasks.
Keyword ：
cross-domain cross-domain fault diagnosis fault diagnosis interpretability analysis interpretability analysis meta-learning meta-learning semi-supervised prototypical network semi-supervised prototypical network
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| GB/T 7714 | Liu, Guigang , Gu, Kairong , Jiang, Haifeng et al. A semi-supervised prototypical network with dual correction for few-shot cross-machine fault diagnosis [J]. | MEASUREMENT SCIENCE AND TECHNOLOGY , 2025 , 36 (4) . |
| MLA | Liu, Guigang et al. "A semi-supervised prototypical network with dual correction for few-shot cross-machine fault diagnosis" . | MEASUREMENT SCIENCE AND TECHNOLOGY 36 . 4 (2025) . |
| APA | Liu, Guigang , Gu, Kairong , Jiang, Haifeng , Zhong, Jianhua , Zhong, Jianfeng . A semi-supervised prototypical network with dual correction for few-shot cross-machine fault diagnosis . | MEASUREMENT SCIENCE AND TECHNOLOGY , 2025 , 36 (4) . |
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This study investigated the static coupling characteristics of a column-type six-component force/moment transducer. An output model of the transducer was developed and validated through finite element method (FEM) simulations. Length-to-diameter ratio (RLD), deflection angles of strain gauge, and multi-component loads were analysed in relation to transducer coupling. Six transducers with different RLDs and strain gauge deflection angles were tested under single and multi-component loads. It was found that the coupling of Fz under Fx or Fy was pronounced when RLD was small. The coupling of Fz under Fx increased from less than 5 % to 34 % when RLD decreased from 3.5 to 2.0. However, couplings of other components under Fz were not sensitive to RLD. The strain gauge deflection angles had the largest effect on the coupling of the Fz component, its coupling increased from 2.5 % to over 17.5% under Mx as the deflection angle increased from 0 degrees to 6 degrees. However, couplings of other components caused by Fz were not sensitive to strain gauge deflection angle. The couplings under multicomponent loads were found to approximate the superposition of those under single-component loads, with deviations within 2 %, indicating good linearity and easy decoupling of the transducer.
Keyword ：
Column-type Column-type Coupling characteristics Coupling characteristics Force measurement Force measurement Six-component Six-component
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| GB/T 7714 | Liang, Wei , Xu, Zhenting , Xie, Zhijie et al. Coupling characteristic of column-type six-component force/ moment transducers [J]. | MEASUREMENT , 2025 , 242 . |
| MLA | Liang, Wei et al. "Coupling characteristic of column-type six-component force/ moment transducers" . | MEASUREMENT 242 (2025) . |
| APA | Liang, Wei , Xu, Zhenting , Xie, Zhijie , Hong, Xiaodong , Zhong, Jianfeng , Zhong, Shuncong et al. Coupling characteristic of column-type six-component force/ moment transducers . | MEASUREMENT , 2025 , 242 . |
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This paper proposes an instantaneous rotational speed (IRS) sensing method that utilizes a circumferential constant-density-sine fringe pattern (CCDSFP) captured by a linear-array sensor (LAS). A novel mathematical imaging model has been established to develop a mapping relationship between the correlation coefficient (CC) value of adjacent frame fringe signals and the IRS. The influence of various factors on the sensing performance was thoroughly investigated through simulations and experiments. The results indicate that this method demonstrates satisfactory measurement accuracy within the measurement range from 0 rpm to the maximum measurable rotation speed. The innovation of this method lies in using only a single line of fringe signal captured by LAS for sensing the rotation speed, which offers significant advantages in rotation speed sensing and computational efficiency compared to area-array camera-based method. Moreover, the new speed encoding and estimation methods exhibit very high sensitivity and accuracy for very low and high rotation speed. Compared to encoders based on pulse counting during a unit time or time interval estimation between two pulses, the proposed method provides higher temporal resolution and angular resolution for rotation speed measurement. Furthermore, this novel sensing method offers a non-intrusive approach that has no additional mass effect on the shaft, and it could be used for the development of new kind of IRS sensor. © 2024 IEEE.
Keyword ：
Circumferential Constant-Density-Sine Fringe Pattern Circumferential Constant-Density-Sine Fringe Pattern Correlation coefficient Correlation coefficient Instantaneous rotational speed Instantaneous rotational speed Vision-based measurement Vision-based measurement
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| GB/T 7714 | Zhong, J. , Chi, S. , Liu, D. et al. Instantaneous Rotational Speed Sensing Method Using Circumferential Constant-Density-Sine Fringe Pattern [J]. | IEEE Transactions on Instrumentation and Measurement , 2024 . |
| MLA | Zhong, J. et al. "Instantaneous Rotational Speed Sensing Method Using Circumferential Constant-Density-Sine Fringe Pattern" . | IEEE Transactions on Instrumentation and Measurement (2024) . |
| APA | Zhong, J. , Chi, S. , Liu, D. , Feng, B. , Zhong, S. . Instantaneous Rotational Speed Sensing Method Using Circumferential Constant-Density-Sine Fringe Pattern . | IEEE Transactions on Instrumentation and Measurement , 2024 . |
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We propose a method for pixel coordinate correction to address subtle camera offsets in an eye-in-hand scheme caused by external factors in a machine-vision positioning guidance system. This method involves establishing a camera-offset pixel coordinate estimation model based on the pinhole camera projection model to eliminate the influence of camera offset on the initial calibration parameters. By dividing the image region into subregions and designing the camera confirmation bit, we analyze the parameters that describe the camera-offset model in each subregion. This allows for the determination of the object feature points’ pixel coordinates prior to offset using the post-offset pixel coordinates as known conditions, thereby ensuring the validity of the initial calibration parameters. Experimental results demonstrate that our method can effectively correct the pixel coordinate offset errors induced by changes in the camera’s fixation condition with a resolution of 1 pixel. © 2024 Universitat zu Koln. All rights reserved.
Keyword ：
camera offset correction camera offset correction digital image correlation digital image correlation machine vision machine vision pixel pixel
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| GB/T 7714 | Tu, Z. , Zhong, J. , Wei, W. et al. Pixel Coordinate Correction for Camera Offsets Based on Visual Localization Guidance; [基于视觉定位引导的相机偏移像素坐标矫正方法] [J]. | Laser and Optoelectronics Progress , 2024 , 61 (14) . |
| MLA | Tu, Z. et al. "Pixel Coordinate Correction for Camera Offsets Based on Visual Localization Guidance; [基于视觉定位引导的相机偏移像素坐标矫正方法]" . | Laser and Optoelectronics Progress 61 . 14 (2024) . |
| APA | Tu, Z. , Zhong, J. , Wei, W. , Chi, S. , Liu, D. , Guo, G. et al. Pixel Coordinate Correction for Camera Offsets Based on Visual Localization Guidance; [基于视觉定位引导的相机偏移像素坐标矫正方法] . | Laser and Optoelectronics Progress , 2024 , 61 (14) . |
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