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Accurate mode control based on inerter array of large unmanned underwater vehicle propulsion motor floating raft system 认领 引用
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作者 Yuehao Li Niaoqing Hu +4 位作者 Zhengyang Yin Yi Yang Xiaosong Lin Zhe Cheng Zuanbo Zhou 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期166-194,共29页
Inerter is a basic two-terminal dynamic element.To explore the theory of inerter and obtain new mode control method of large unmanned underwater vehicle propulsion motor floating raft system,novel accurate mode contro... Inerter is a basic two-terminal dynamic element.To explore the theory of inerter and obtain new mode control method of large unmanned underwater vehicle propulsion motor floating raft system,novel accurate mode control based on inerter array is proposed.First,accurate mode control based on triangular inerter array is researched.Then,method of accurate mode control based on rectangular inerter array is explained.Then,accurate mode control based on cross inerter array is researched.Dynamic models and accurate mode control methods are verified by experiments.The percentage deviations between experimental and theoretical natural frequencies are within 12%.It is concluded that accurate mode control based on inerter array is effective.Triangular inerter array and rectangular inerter array with equal inertances and nonzero distances must change all points to change a mode.Isosceles triangular inerter array which contains zero distance and cross inerter array need to change two points to change a torsional mode.Inerter arrays with a centroid inerter can accurately change the translational mode. 展开更多
关键词 Inerter Inerter array Accurate mode control Natural frequency
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Highly accurate calibration of particle number portable emissions measurement systems(PN-PEMS)via actual soot charging probability correction 认领 引用
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作者 Haotian Guo Chengxiang Guo +6 位作者 Tongzhu Yu Huaqiao Gui Yixin Yang Zhe Ji Junjie Liu Jiguang Wang Jianguo Liu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第6期1-11,共11页
The upcoming Euro 7 vehicle emissions regulation sets new requirements for calibrating particle number portable emissions measurement systems(PN-PEMS).In current PN concentration calibration methods,arbitrary selectio... The upcoming Euro 7 vehicle emissions regulation sets new requirements for calibrating particle number portable emissions measurement systems(PN-PEMS).In current PN concentration calibration methods,arbitrary selection of aerosolmaterials and incorrect estimation ofmultiply-charged particles lead to calibration deviation.This study proposes a novel,accurate calibration method based on the calibration and correction of the actual charging probability of soot for calibrating PN-PEMS.The accurate calibration results of a PN-PEMS show a maximum reduction of 7.65%in the+1-charging probability deviation and of 3.15%in the counting efficiency deviation.The calibration of the actual charging probability of soot introduces a calibration uncertainty increment of 0.09%-2.71%,and the overall uncertainty is<4.76%,whichmakes the calibration results more credible.The interaction of calibration aerosols of different physicochemical properties with the condensation particle counter working fluid and catalytic stripper device is the main reason for the different PN-PEMS calibration results.The calibration of the actual charging probability of particles is the fundamental method to eliminate the calibration deviation caused by the estimation and correction of multiply-charged particles. 展开更多
关键词 Accurate calibration Portable emissions measurement systems(PEMS) Particle number(PN) Soot Charging probability Multiply-charged correction
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HUANNet: A High-Resolution Unified Attention Network for Accurate Counting 认领 引用
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作者 Haixia Wang Huan Zhang +2 位作者 Xiuling Wang Xule Xin Zhiguo Zhang 《Computers, Materials & Continua》 SCIE EI 2026年第1期1722-1741,共20页
Accurately counting dense objects in complex and diverse backgrounds is a significant challenge in computer vision,with applications ranging from crowd counting to various other object counting tasks.To address this,w... Accurately counting dense objects in complex and diverse backgrounds is a significant challenge in computer vision,with applications ranging from crowd counting to various other object counting tasks.To address this,we propose HUANNet(High-Resolution Unified Attention Network),a convolutional neural network designed to capture both local features and rich semantic information through a high-resolution representation learning framework,while optimizing computational distribution across parallel branches.HUANNet introduces three core modules:the High-Resolution Attention Module(HRAM),which enhances feature extraction by optimizing multiresolution feature fusion;the Unified Multi-Scale Attention Module(UMAM),which integrates spatial,channel,and convolutional kernel information through an attention mechanism applied across multiple levels of the network;and the Grid-Assisted Point Matching Module(GPMM),which stabilizes and improves point-to-point matching by leveraging grid-based mechanisms.Extensive experiments show that HUANNet achieves competitive results on the ShanghaiTech Part A/B crowd counting datasets and sets new state-of-the-art performance on dense object counting datasets such as CARPK and XRAY-IECCD,demonstrating the effectiveness and versatility of HUANNet. 展开更多
关键词 Accurate counting high-resolution representations point-to-point matching
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AI-Driven Acoustic Metamaterials for Pixel-Accurate Sound Insulation Control 认领 引用
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作者 Kaijing Liu Yihuan Zhu +3 位作者 Jiachen Meng Ruizhi Dong Xu Wang Yong Li 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第2期349-355,共7页
Acoustic metamaterials have emerged as a promising platform for efficient and flexible low-frequency sound insulation,overcoming the limitations imposed by the mass law governing conventional materials.While metamater... Acoustic metamaterials have emerged as a promising platform for efficient and flexible low-frequency sound insulation,overcoming the limitations imposed by the mass law governing conventional materials.While metamaterials achieve low-frequency sound insulation via local anti-resonances from membranes or plates of their meta-units,their broadband performance is inherently constrained by the narrow-band nature of resonances.Although tailoring the distribution of attached masses offers a pathway to modulate these modes'spectral features,the complexity of such configurations renders analytical solutions intractable.Here,we propose a deep learning framework that bridges this gap by encoding intricate mass distributions as pixelated images(mass-loaded and mass-free regions)and establishing a direct mapping between these images and the resulting transmission loss(TL)spectra.This approach facilitates inverse design of broadband sound-insulating metamaterials for a target TL spectrum and enables rapid performance prediction for arbitrary mass configurations.By synergizing artificial intelligence with the complicated mode engineering of acoustic metamaterials,our work establishes a data-driven paradigm for advanced wave manipulation,opening avenues for next-generation noise control technologies. 展开更多
关键词 pixel accurate control modulate thes transmission loss tailoring distribution attached masses inverse design broadband performance acoustic metamaterials broadband sound insulation
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Innovative Research on Accurate Water Environment Monitoring and Collaborative Prevention Based on Digital Twin 认领 引用
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作者 WANG Li 《外文科技期刊数据库（文摘版）自然科学》 2026年第1期038-041,共4页
Against the background of the in-depth advancement of global industrialization and urbanization, water pollution presents compound and concealed characteristics. Traditional monitoring and prevention modes face bottle... Against the background of the in-depth advancement of global industrialization and urbanization, water pollution presents compound and concealed characteristics. Traditional monitoring and prevention modes face bottlenecks such as insufficient accuracy and weak synergy. Based on the innovative perspective of the deep integration of digital technology and ecological governance, this paper constructs the theoretical framework of "digital twin + water environment governance", and focuses on the application paths of digital twin technology in the optimization of monitoring system and the innovation of prevention mechanism. At the level of accurate monitoring, it proposes the construction of a full-factor perception network, the development of a dynamic simulation early warning model and a cross-scale data fusion method based on digital twin. At the level of collaborative prevention, it explores intelligent pollution source tracing and control, multi-agent collaborative governance mechanism and a full life cycle risk prevention and control system. The research aims to break through the technical and institutional limitations of traditional governance modes, provide theoretical support and technical paradigm for realizing the digitalization, precision and collaboration of water environment governance, and boost the high-quality coordinated development of ecological environment and economy and society. 展开更多
关键词 digital twin accurate water environment monitoring collaborative prevention dynamic early warning pollution source tracing full life cycle control
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Fast and Accurate Prediction of Electromagnetic and Temperature Fields for SPMSM Equipped with Unequally Thick Magnetic Poles 认领 引用 被引量：3
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作者 Feng Liu Xiuhe Wang +1 位作者 Lingling Sun Hongye Wei 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2025年第2期199-211,共13页
With the continuous upgrading of traditional manufacturing industries and the rapid rise of emerging technology fields,the performance requirements for the permanent magnet synchronous motors(PMSMs)have become higher ... With the continuous upgrading of traditional manufacturing industries and the rapid rise of emerging technology fields,the performance requirements for the permanent magnet synchronous motors(PMSMs)have become higher and higher.The importance of fast and accurate electromagnetic thermal coupling analysis of such motors becomes more and more prominent.In view of this,the surfacemounted PMSM(SPMSM)equipped with unequally thick magnetic poles is taken as the main object and its electromagnetic thermal coupling analytical model(ETc AM)is investigated.First,the electromagnetic analytical model(EAM)is studied based on the modified subdomain method.It realizes the fast calculation of key electromagnetic characteristics.Subsequently,the 3D thermal analytical model(TAM)is developed by combining the EAM,the lumped parameter thermal network method(LPTNM),and the partial differential equation of heat flux.It realizes the fast calculation of key thermal characteristics in 3D space.Further,the information transfer channel between EAM and TAM is built with reference to the intrinsic connection between electromagnetic field and temperature field.Thereby,the novel ETcAM is proposed to realize the fast and accurate prediction of electromagnetic and temperature fields.Besides,ETcAM has a lot to commend it.One is that it well accounts for the complex structure,saturation,and heat exchange behavior.Second,it saves a lot of computer resources.It offers boundless possibilities for initial design,scheme evaluation,and optimization of motors.Finally,the validity,accuracy,and practicality of this study are verified by simulation and experiment. 展开更多
关键词 Electromagnetic field and temperature field Electromagnetic thermal coupling analytical model(ETcAM) Fast and accurate prediction SPMSM Unequally thick magnetic poles
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Accurate calculation of induced electromotive force for axial field hybrid permanent magnet memory machine 认领 引用
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作者 YANG Gongde MA Junchao LIN Mingyao 《Journal of Southeast University(English Edition)》 EI CAS 2025年第3期375-383,共9页
The axial field hybrid permanent magnet memory machine(AFHPM-MM)employs a hybrid permanent magnet excitation combining NdFeB and AlNiCo,achieving high torque density and a wide flux adjustment range.A separated stator... The axial field hybrid permanent magnet memory machine(AFHPM-MM)employs a hybrid permanent magnet excitation combining NdFeB and AlNiCo,achieving high torque density and a wide flux adjustment range.A separated stator structure is adopted to enhance its antidemagnetization capability.To analyze the contributions of AlNiCo and NdFeB to the induced electromotive force(EMF)in the AFHPM-MM,a frozen permeability-based induced EMF calculation method is proposed.Theoretical analysis reveals that the conventional method exhibits substantial errors in calculating the AlNiCo-induced EMF,primarily attributed to its failure to adequately account for the dynamic magnetization characteristic discrepancies of AlNiCo under varying magnetization states.Through the analysis of magnetization variations in AlNiCo during the flux adjustment process under different magnetization states,an improved induced EMF calculation method is proposed.Comparative results indicate that,during the flux enhancement process,the average calculation error of the AlNiCo-induced EMF is reduced from 19.84%to 2.09%,whereas during the flux weakening process,the error is reduced from 3.87%to 1.67%.The proposed method achieves accurate induced EMF calculation for the AFHPM-MM. 展开更多
关键词 axial field hybrid permanent magnet excita-tion memory machine induced electromotive force(EMF) accurate calculation
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AARPose:Real-time and accurate drogue pose measurement based on monocular vision for autonomous aerial refueling 认领 引用 被引量：2
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作者 Shuyuan WEN Yang GAO +3 位作者 Bingrui HU Zhongyu LUO Zhenzhong WEI Guangjun ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第6期552-572,共21页
Real-time and accurate drogue pose measurement during docking is basic and critical for Autonomous Aerial Refueling(AAR).Vision measurement is the best practicable technique,but its measurement accuracy and robustness... Real-time and accurate drogue pose measurement during docking is basic and critical for Autonomous Aerial Refueling(AAR).Vision measurement is the best practicable technique,but its measurement accuracy and robustness are easily affected by limited computing power of airborne equipment,complex aerial scenes and partial occlusion.To address the above challenges,we propose a novel drogue keypoint detection and pose measurement algorithm based on monocular vision,and realize real-time processing on airborne embedded devices.Firstly,a lightweight network is designed with structural re-parameterization to reduce computational cost and improve inference speed.And a sub-pixel level keypoints prediction head and loss functions are adopted to improve keypoint detection accuracy.Secondly,a closed-form solution of drogue pose is computed based on double spatial circles,followed by a nonlinear refinement based on Levenberg-Marquardt optimization.Both virtual simulation and physical simulation experiments have been used to test the proposed method.In the virtual simulation,the mean pixel error of the proposed method is 0.787 pixels,which is significantly superior to that of other methods.In the physical simulation,the mean relative measurement error is 0.788%,and the mean processing time is 13.65 ms on embedded devices. 展开更多
关键词 Autonomous aerial refueling Vision measurement Deep learning Real-time Lightweight Accurate Monocular vision Drogue pose measurement
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An Efficient and Accurate Solution for the PnPL Problem 认领 引用 被引量：1
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作者 Ridma Basnayaka Qida Yu 《Instrumentation》 2025年第3期63-75,共13页
Camera Pose Estimating from point and line correspondences is critical in various applications,including robotics,augmented reality,3D reconstruction,and autonomous navigation.Existing methods,such as the Perspective-... Camera Pose Estimating from point and line correspondences is critical in various applications,including robotics,augmented reality,3D reconstruction,and autonomous navigation.Existing methods,such as the Perspective-n-Point(PnP)and Perspective-n-Line(PnL)approaches,offer limited accuracy and robustness in environments with occlusions,noise,or sparse feature data.This paper presents a unified solution,Efficient and Accurate Pose Estimation from Point and Line Correspondences(EAPnPL),combining point-based and linebased constraints to improve pose estimation accuracy and computational efficiency,particularly in low-altitude UAV navigation and obstacle avoidance.The proposed method utilizes quaternion parameterization of the rotation matrix to overcome singularity issues and address challenges in traditional rotation matrix-based formulations.A hybrid optimization framework is developed to integrate both point and line constraints,providing a more robust and stable solution in complex scenarios.The method is evaluated using synthetic and realworld datasets,demonstrating significant improvements in performance over existing techniques.The results indicate that the EAPnPL method enhances accuracy and reduces computational complexity,making it suitable for real-time applications in autonomous UAV systems.This approach offers a promising solution to the limitations of existing camera pose estimation methods,with potential applications in low-altitude navigation,autonomous robotics,and 3D scene reconstruction. 展开更多
关键词 camera pose estimation efficient and accurate pose estimation(eapnpl) UAV navigation obstacle avoidance point-and-line correspondences
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The Study Dynamics of Accurately Targeted Poverty Alleviation 认领 引用
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作者 Guang-yan CHEN Tian-hui ZHUANG 《International Journal of Technology Management》 2015年第11期10-13,共4页
The accurately targeted poverty alleviation has gradually become one of the important research directions in the field of poverty research. The existing foreign and domestic studies concerning about the accurately tar... The accurately targeted poverty alleviation has gradually become one of the important research directions in the field of poverty research. The existing foreign and domestic studies concerning about the accurately targeted poverty alleviation are few and mainly focus on the aspects such as poverty object recognition, target for poverty alleviation, and fund embarking; a complete system has not yet been formed for the relevant studies. On the basis of analyzing and reviewing relevant studies on the accurately targeted poverty alleviation at home and abroad, a further research direction for the accurately targeted poverty alleviation is proposed in this paper. 展开更多
关键词 Accurately Targeted Poverty Alleviation Poverty Accurate Recognition Accurate Supports Accurate Management
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Ultrasensitive and accurate diagnosis of urothelial cancer by plasmonic AuNRs-enhanced fluorescence of near-infrared Ag2S quantum dots 认领 引用 被引量：9
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作者 Dong Zhang Cai-Ping Ding +6 位作者 Xiao-Yue Zheng Jia-Zhou Ye Zi-Hai Chen Jian-Hua Li Ze-Jun Yan Jun-Hui Jiang You-Ju Huang 《Rare Metals》 SCIE EI CAS CSCD 2022年第11期3828-3838,共11页
Urothelial carcinoma(UC)is a common malignant tumor in the urinary system with high recurrence rate and low survival rate 5 years after surgery.At present,imaging examination and other diagnostic methods have some sho... Urothelial carcinoma(UC)is a common malignant tumor in the urinary system with high recurrence rate and low survival rate 5 years after surgery.At present,imaging examination and other diagnostic methods have some shortcomings such as invasiveness and non-specificity.Therefore,it is urgent to develop a simple,rapid,noninvasive,highly sensitive and highly specific strategy to diagnose UC.Herein,a high-performance fluorescence sensor was constructed by the plasmonic gold nanorods(AuNRs)-enhanced near-infrared(NIR)fluorescence of silver sulfide quantum dots(Ag2S QDs).The designed sensor can be used for the fast and accurate detection of small molecule single-transmembrane protein(FXYD3),which is overexpressed in 90%of ureteral cancers and 84%of high-grade bladder cancers.Due to its high specificity,the NIR fluorescence sensor achieves the detection of FXYD3 in the range of 0.25-150 ng·ml-1with a detection limit of 0.2 ng·ml-1.Importantly,it also can be used for accurate diagnosis of FXYD3 in the urine of patients with relevant cancers,and the results are consistent with clinical cystoscopy and pathological analysis.The proposed fluorescence sensor provides a simple,ultrasensitive,reliable method for UC screening,tumor-grade classification and postoperative monitoring and will have great potential for clinical applications. 展开更多
关键词 Urothelial carcinoma FXYD3 Plasmonic enhanced fluorescence Ultrasensitive Accurate diagnosis
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3D Printing Hip Prostheses Offer Accurate Reconstruction,Stable Fixation,and Functional Recovery for Revision Total Hip Arthroplasty with Complex Acetabular Bone Defect 认领 引用 被引量：14
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作者 Yongqiang Hao Lei Wang +5 位作者 Wenbo Jiang Wen Wu Songtao Ai Lu Shen Shuang Zhao Kerong Dai 《Engineering》 SCIE EI CAS 2020年第11期1285-1290,共6页
Complicated and large acetabular bone defects present the main challenges and difficulty in the revision of total hip arthroplasty(THA).This study aimed to explore the advantages of three-dimensional(3D)printing techn... Complicated and large acetabular bone defects present the main challenges and difficulty in the revision of total hip arthroplasty(THA).This study aimed to explore the advantages of three-dimensional(3D)printing technology in the reconstruction of such acetabular bone defects.We retrospectively analyzed the prognosis of four severe bone defects around the acetabulum in three patients who were treated using 3D printing technology.Reconstruction of bone defect by conventional methods was difficult in these patients.In this endeavor,we used radiographic methods,related computer software such as Materialise's interactive medical image control system and Siemens NX software,and actual surgical experience to estimate defect volume,prosthesis stability,and installation accuracy,respectively.Moreover,a Harris hip score was obtained to evaluate limb function.It was found that bone defects could be adequately reconstructed using a 3D printing prosthesis,and its stability was reliable.The Harris hip score indicated a very good functional recovery in all three patients.In conclusion,3D printing technology had a good therapeutic effect on both complex and large bone defects in the revision of THA.It was able to achieve good curative effects in patients with large bone defects. 展开更多
关键词 3D printing Hip revision Complex and large acetabular bone defect Accurate reconstruction
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Analysis of algebraic reconstruction technique for accurate imaging of gas temperature and concentration based on tunable diode laser absorption spectroscopy 认领 引用 被引量：6
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作者 夏晖晖 阚瑞峰 +2 位作者 刘建国 许振宇 何亚柏 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第6期246-253,共8页
An improved algebraic reconstruction technique（ART） combined with tunable diode laser absorption spectroscopy（TDLAS） is presented in this paper for determining two-dimensional（2D） distribution of H2O concentrati... An improved algebraic reconstruction technique（ART） combined with tunable diode laser absorption spectroscopy（TDLAS） is presented in this paper for determining two-dimensional（2D） distribution of H2O concentration and temperature in a simulated combustion flame.This work aims to simulate the reconstruction of spectroscopic measurements by a multi-view parallel-beam scanning geometry and analyze the effects of projection rays on reconstruction accuracy.It finally proves that reconstruction quality dramatically increases with the number of projection rays increasing until more than 180 for 20 × 20 grid,and after that point,the number of projection rays has little influence on reconstruction accuracy.It is clear that the temperature reconstruction results are more accurate than the water vapor concentration obtained by the traditional concentration calculation method.In the present study an innovative way to reduce the error of concentration reconstruction and improve the reconstruction quality greatly is also proposed,and the capability of this new method is evaluated by using appropriate assessment parameters.By using this new approach,not only the concentration reconstruction accuracy is greatly improved,but also a suitable parallel-beam arrangement is put forward for high reconstruction accuracy and simplicity of experimental validation.Finally,a bimodal structure of the combustion region is assumed to demonstrate the robustness and universality of the proposed method.Numerical investigation indicates that the proposed TDLAS tomographic algorithm is capable of detecting accurate temperature and concentration profiles.This feasible formula for reconstruction research is expected to resolve several key issues in practical combustion devices. 展开更多
关键词 algebraic reconstruction technique 2D distribution projection rays accurate reconstruction
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Accurate models and nutritional strategies for specific oxidative stress factors: Does the dose matter in swine production? 认领 引用 被引量：3
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作者 Changming Hong Yujian Huang +6 位作者 Shuting Cao Li Wang Xuefen Yang Shenglan Hu Kaiguo Gao Zongyong Jiang Hao Xiao 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2024年第2期519-534,共16页
Oxidative stress has been associated with a number of physiological problems in swine,including reduced production efficiency.Recently,although there has been increased research into regulatory mechanisms and antioxid... Oxidative stress has been associated with a number of physiological problems in swine,including reduced production efficiency.Recently,although there has been increased research into regulatory mechanisms and antioxidant strategies in relation to oxidative stress-induced pig production,it remains so far largely unsuccessful to develop accurate models and nutritional strategies for specific oxidative stress factors.Here,we discuss the dose and dose intensity of the causes of oxidative stress involving physiological,environmental and dietary factors,recent research models and the antioxidant strategies to provide theoretical guidance for future oxidative stress research in swine. 展开更多
关键词 Accurate models Dose Nutritional strategies Oxidative stress Swine
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Adaptive accurate tracking control of HFVs in the presence of dead-zone and hysteresis input nonlinearities 认领 引用 被引量：4
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作者 Zehong DONG Yinghui LI +1 位作者 Maolong LV Renwei ZUO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第5期642-651,共10页
A novel accurate tracking controller is developed for the longitudinal dynamics of Hypersonic Flight Vehicles(HFVs)in the presence of large model uncertainties,external disturbances and actuator nonlinearities.Distinc... A novel accurate tracking controller is developed for the longitudinal dynamics of Hypersonic Flight Vehicles(HFVs)in the presence of large model uncertainties,external disturbances and actuator nonlinearities.Distinct from the state-of-the-art,besides being continuity,no restrictive conditions have been imposed on the HFVs dynamics.The system uncertainties are skillfully handled by being seen as bounded"disturbance terms".In addition,by means of backstepping adaptive technique,the accurate tracking(i.e.tracking errors converge to zero as time approaches infinity)rather than bounded tracking(i.e.tracking errors converge to residual sets)has been achieved.What’s more,the accurate tracking problems for HFVs subject to actuator dead-zone and hysteresis are discussed,respectively.Then,all signals of closed-loop system are verified to be Semi-Global Uniformly Ultimate Boundness(SGUUB).Finally,the efficacy and superiority of the developed control strategy are confirmed by simulation results. 展开更多
关键词 Accurate tracking control Back-stepping control Dead-Zone and hysteresis Hypersonic flight vehicles Non-affine model
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Predicting the probability distribution of Martian rocks mechanical property based on microscale rock mechanical experiments and accurate grain-based modeling 认领 引用 被引量：4
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作者 Shuohui Yin Yingjie Wang Jingang Liu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第9期1327-1339,共13页
The exploration of Mars would heavily rely on Martian rocks mechanics and engineering technology.As the mechanical property of Martian rocks is uncertain,it is of utmost importance to predict the probability distribut... The exploration of Mars would heavily rely on Martian rocks mechanics and engineering technology.As the mechanical property of Martian rocks is uncertain,it is of utmost importance to predict the probability distribution of Martian rocks mechanical property for the success of Mars exploration.In this paper,a fast and accurate probability distribution method for predicting the macroscale elastic modulus of Martian rocks was proposed by integrating the microscale rock mechanical experiments(micro-RME),accurate grain-based modeling(AGBM)and upscaling methods based on reliability principles.Firstly,the microstructure of NWA12564 Martian sample and elastic modulus of each mineral were obtained by micro-RME with TESCAN integrated mineral analyzer(TIMA)and nanoindentation.The best probability distribution function of the minerals was determined by Kolmogorov-Smirnov(K-S)test.Secondly,based on best distribution function of each mineral,the Monte Carlo simulations(MCS)and upscaling methods were implemented to obtain the probability distribution of upscaled elastic modulus.Thirdly,the correlation between the upscaled elastic modulus and macroscale elastic modulus obtained by AGBM was established.The accurate probability distribution of the macroscale elastic modulus was obtained by this correlation relationship.The proposed method can predict the probability distribution of Martian rocks mechanical property with any size and shape samples. 展开更多
关键词 Probability distribution Martian rocks Microscale rock mechanic experiment Nanoindentation Accurate grain-based modeling
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Folded novel accurate analytical and semi-analytical solutions of a generalized Calogero–Bogoyavlenskii–Schiff equation 认领 引用 被引量：2
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作者 Mostafa M A Khater S K Elagan +3 位作者 M A El-Shorbagy S H Alfalqi J F Alzaidi Nawal A Alshehri 《Communications in Theoretical Physics》 SCIE CAS CSCD 2021年第9期26-36,共11页
This paper studies the analytical and semi-analytic solutions of the generalized Calogero–Bogoyavlenskii–Schiff(CBS)equation.This model describes the(2+1)–dimensional interaction between Riemann-wave propagation al... This paper studies the analytical and semi-analytic solutions of the generalized Calogero–Bogoyavlenskii–Schiff(CBS)equation.This model describes the(2+1)–dimensional interaction between Riemann-wave propagation along the y-axis and the x-axis wave.The extended simplest equation(ESE)method is applied to the model,and a variety of novel solitarywave solutions is given.These solitary-wave solutions prove the dynamic behavior of soliton waves in plasma.The accuracy of the obtained solution is verified using a variational iteration(VI)semi-analytical scheme.The analysis and the match between the constructed analytical solution and the semi-analytical solution are sketched using various diagrams to show the accuracy of the solution we obtained.The adopted scheme’s performance shows the effectiveness of the method and its ability to be applied to various nonlinear evolution equations. 展开更多
关键词 generalized Calogero-Bogoyavlenskii-Schiff equation accurate analytical semianalytical solutions
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New finite strain elastoplastic equations for accurately and explicitly simulating pseudoelastic-to-plastic transition effects of shape memory alloys 认领 引用 被引量：2
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作者 Siyu WANG Lin ZHAN +1 位作者 Huifeng XI Heng XIAO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2020年第10期1583-1596,共14页
A new finite strain elatoplastic J2-flow model with coupling effects of both isotropic and anisotropic hardening is proposed with the co-rotational logarithmic rate.In terms of certain single-variable shape functions ... A new finite strain elatoplastic J2-flow model with coupling effects of both isotropic and anisotropic hardening is proposed with the co-rotational logarithmic rate.In terms of certain single-variable shape functions representing uniaxial loading and unloading curves,explicit multi-axial expressions for the three hardening quantities incorporated in the new model proposed are derived in unified forms for the purpose of automatically and accurately simulating complex pseudoelastic-to-plastic transition effects of shape memory alloys(SMAs)under multiple loading-unloading cycles.Numerical examples show that with only a single parameter of direct physical meaning for each cycle,accurate and explicit simulations may be achieved for extensive data from multiple cycle tests. 展开更多
关键词 shape memory alloy(SMA) finite deformation pseudo-elasticity plasticity cyclic loading transition effect elastoplastic equation explicit and accurate approach
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A new principle and device for large aircraft components gaining accurate support by ball joint 认领 引用 被引量：2
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作者 Bao-gui QIU Jun-xia JIANG Ying-lin KE 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2011年第5期405-414,共10页
How to obtain an accurate support for large components by ball joint is a key process in aircraft digital assembly.A novel principle and device is developed to solve the problem.Firstly,the working principle of the de... How to obtain an accurate support for large components by ball joint is a key process in aircraft digital assembly.A novel principle and device is developed to solve the problem.Firstly,the working principle of the device is introduced.When three or four displacement sensors installed in the localizer are touched by the ball-head,the spatial relation is calculated between the large aircraft component's ball-head and the localizer's ball-socket.The localizer is driven to achieve a new position by compensation.Relatively,a support revising algorithm is proposed.The localizer's ball-socket approaches the ball-head based on the displacement sensors.According to the points selected from its spherical surface,the coordinates of ball-head spherical center are computed by geometry.Finally,as a typical application,the device is used to conduct a test-fuselage's ball-head into a localizer's ball-socket.Positional deviations of the spherical centers between the ball-head and the ball-socket in the x,y,and z directions are all controlled within±0.05 mm under various working conditions.The results of the experiments show that the device has the characteristics of high precision,excellent stability,strong operability,and great potential to be applied widely in the modern aircraft industry. 展开更多
关键词 Aircraft digital assembly Large aircraft component Accurate support Ball joint Displacement sensor Three coordinate numerical control localizer
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Integrated high-performance and accurate shaping technology of low-cost powder metallurgy titanium alloys: A comprehensive review 认领 引用 被引量：1
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作者 Xuemeng Gan Shaofu Li +1 位作者 Shunyuan Xiao Yafeng Yang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第3期413-426,共14页
The practical engineering applications of powder metallurgy (PM) Ti alloys produced through cold compaction and pressure-less sintering are impeded by poor sintering densification, embrittlement caused by excessive O ... The practical engineering applications of powder metallurgy (PM) Ti alloys produced through cold compaction and pressure-less sintering are impeded by poor sintering densification, embrittlement caused by excessive O impurities, and severe sintering deforma-tion resulting from the use of heterogeneous powder mixtures. This review presents a summary of our previous work on addressing the above challenges. Initially, we proposed a novel strategy using reaction-induced liquid phases to enhance sintering densification. Near- complete density (relative density exceeding 99%) was achieved by applying the above strategy and newly developed sintering aids. By focusing on the O-induced embrittlement issue, we determined the onset dissolution temperature of oxide films in the Ti matrix. On the basis of this finding, we established a design criterion for effective O scavengers that require reaction with oxide films before their dissol-ution. Consequently, a ductile PM Ti alloy was successfully obtained by introducing 0.3wt% NdB6 as the O scavenger. Lastly, a powder- coating strategy was adopted to address the sintering deformation issue. The ultrafine size and shell-like distribution characteristics of coating particles ensured rapid dissolution and homogeneity in the Ti matrix, thereby facilitating linear shrinkage during sintering. As a result, geometrically complex Ti alloy parts with high dimensional accuracy were fabricated by using the coated powder. Our fundament-al findings and related technical achievements enabled the development of an integrated production technology for the high-performance and accurate shaping of low-cost PM Ti alloys. Additionally, the primary engineering applications and progress in the industrialization practice of our developed technology are introduced in this review. 展开更多
关键词 powder metallurgy titanium sintering densification oxygen scavenging accurate shaping
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