检索结果-内蒙古大学图书馆

Preparation and Mechanical Properties of Bionic Carbon Fiber/Epoxy Resin Composites Inspired by Owl Feather

Journal of Bionic Engineering 2025年第1期22卷 282-292页

作者： Zerun Yu Jiaan Liu Tian Yang Linyang Zhang Chunhua Hu Key Laboratory of Automobile Materials(Ministry of Education) College of Materials Science and EngineeringJilin UniversityChangchun130022China National Key Laboratory of Advanced Vehicle Integration and Control General R&D InstituteChina FAW Co.LtdChangchun130011China

Insufficient interfacial activity and poor wettability between fibers and matrix are the two main factors limiting the improvement of mechanical properties of Carbon Fiber Reinforced Plastics(CFRP).Owl feathers are known for their unique compact structure;they are not only lightweight but also *** this study,an in-depth look at owl feathers was made and it found that owl feathers not only have the macro branches structure between feather shafts and branches but also have fine feather structures on the *** presence of these fine feather structures increases the specific surface area of the plume branches and allows neighboring plume branches to hook up with each other,forming an effective mechanical interlocking *** structures bring owl feathers excellent mechanical *** by the natural structure of owl feathers,a weaving technique and a sizing process were combined to prepare bionic Carbon Fiber(CF)fabrics and then to fabricate the bionic CFRP with structural characteristics similar to owl *** evaluate the effect of the fine feather structure on the mechanical properties of CFRP,a mechanical property study on CFRP with and without the fine feather imitation structure were *** experimental results show that the introduction of the fine feather branch structure enhance the mechanical properties of CFRP ***,the tensile strength of the composites increased by 6.42%and 13.06%and the flexural strength increased by 8.02%and 16.87%in the 0°and 90°sample directions,*** results provide a new design idea for the improvement of the mechanical properties of the CFRP,promoting the application of CFRP in engineering fields,such as automotive transportation,rail transit,aerospace,and construction.

关键词： Carbon fiber reinforced epoxy composites Owl feather Bionic feather structure Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Simulation and experimental validation of vehicle dynamic characteristics for the hydraulic rebound stopper shock absorber

引用

Journal of Mechanical Science and Technology 2025年第5期39卷 2409-2416页

作者： Sun, Jiaxing Han, Chao Liu, Dan Zhao, Xingming Gao, Chuang National Key Laboratory of Advanced Vehicle Integration and Control Product Development Center China Faw Group Co. LTD. Changchun China

This study proposes a new dynamic model for a hydraulic rebound stopper (HRS) shock absorber to predict dynamic characteristics. In order to simulate and verify the dynamic characteristics of the vehicle, mathematical modeling was conducted on the HRS shock absorber by considering the oil flow in the chamber and valve. The stiffness curve of the valve was simulated using the finite element software Abaqus. The curve was then imported into the detailed model of the shock absorber for simulation using AMESim software. The damping force versus displacement and velocity of the piston was in good agreement with the experimental data. It proved the accuracy of the simulation model. The full vehicle was modeled using Adams software. The dynamic characteristics of the vehicle with HRS shock absorber were analyzed using AMESim/Adams co-simulation model. In order to prove the effectiveness of the proposed damper, the simulation results of the damper characteristics were compared with the experimental ones, which showed similar dynamic behavior. The simulation results were compared with the ones of the general shock absorber. The simulation results indicate that the HRS shock absorber has a reduced impact on bumpy roads. The results presented in this paper will contribute to a more comprehensive understanding of the HRS shock absorber. Moreover, it is postulated that the characteristics of these outcomes may be applied to the dynamic design of vehicles. © The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： ABAQUS

来源：评论

学校读者我要写书评

暂无评论

Improving aircraft nose wheel steering stability based on control continuation method

引用

Science China(Technological Sciences) 2025年第3期68卷 258-277页

作者： Qiaozhi YIN Dexu KONG Jiawei WANG Hong NIE Xiaohui WEI National Key Laboratory of Helicopter Aeromechanics Nanjing210016China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing210016China AVIC Nanjing Engineering Institute of Aircraft Systems Nanjing211106China

Aircraft steering instability during the taxiing process sometimes occurs resulting from the unstable bifurcation phenomena of the nonlinear steering dynamic system,which may lead to severe *** this study,the control parameter design of an aircraft nose wheel steering control system based on the control continuation method is proposed to reduce the number of unstable bifurcation points and enlarge the system stable region area in a certain parameter ***,the aircraft turning performance can be improved ***,a nonlinear aircraft rollout dynamic model is constructed,and the aircraft ground steering bifurcation characteristics are obtained under the open-loop steering control ***,the bifurcation performances under three closed-loop nose wheel steering controllers based on the feedback control method are compared,and the control parameter of the quadratic nonlinear controller with a better bifurcation control effect is selected as a second bifurcation parameter to analyze the directional system stability via two-parameter bifurcation ***,the influence of a crosswind on the aircraft ground steering bifurcation performance is studied for various control parameter ***,the control effects of a traditional proportional-integral-derivative(PID)nose wheel steering control law and the designed feedback controller are compared and ***,a semi-physical experiment of the aircraft nose wheel steering system is carried out,and different control parameter values are selected for test verification,which can further verify the control effect of the designed nonlinear feedback *** results indicate that the feedback control method is unable to vary the system bifurcation types,but appropriate control parameter design can effectively shrink the system instability region and even eliminate the unstable Hopf bifurcation points under some specific working conditions,improving the aircraft ground turning stability re

关键词： aircraft taxiing dynamics and stability nose wheel steering control system control continuation steering bifurcation characteristics quadratic feedback control

来源：评论

学校读者我要写书评

暂无评论

Uncertainty-aware Deep Reinforcement Learning for Trainable Equivalent Consumption Minimization Strategy of Fuel Cell Hybrid Electric Tracked vehicle

引用

IEEE Transactions on Transportation Electrification 2025年

作者： Su, Qicong Huang, Ruchen Zhang, Zhendong Shou, Yiwen He, Hongwen Beijing Institute of Technology National Key Laboratory of Advanced Vehicle Integration and Control Beijing100081 China

Energy management strategies (EMSs) are pivotal in optimizing energy efficiency for vehicles equipped with hybrid electric powertrains. Despite the growing adoption of deep reinforcement learning (DRL)-based approaches, challenges persist in achieving satisfactory optimization performance and maintaining reliable control. Motivated by this, this paper introduces a novel trainable equivalent consumption minimization strategy (ECMS) framework for fuel cell hybrid electric tracked vehicles (FCHETVs) with uncertainty-aware control. Firstly, the proposed framework employs a DRL algorithm to dynamically determine and optimize the equivalent factor in the ECMS method, facilitating improved fuel economy. Then, the soft actor-critic (SAC) algorithm is formulated for efficient policy learning. To further enhance control reliability, an ensembled policy network method is incorporated to measure uncertainty and mitigate suboptimal actions, thereby improving decision-making robustness. Simulation results reveal that the SAC-based trainable ECMS achieves significant fuel economy improvements, outperforming the traditional SAC and adaptive ECMS methods by 2.93% and 5.15% respectively. Moreover, the ensemble model ensures reliable and effective control, with online testing results indicating an additional 2.08% improvement in fuel economy. These findings underscore the effectiveness of integrating learning-based and optimization-based approaches in EMS design, offering a robust pathway to reducing energy consumption and promoting sustainable transportation solutions. © 2015 IEEE.

关键词： Deep reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Enhanced corrosion resistance of calcium carbonate coatings on magnesium alloy via simple stearic acid treatment

引用

Journal of Magnesium and Alloys 2025年第4期13卷 1602-1616页

作者： Wang, Tianxiao Li, Panpan Guo, Yunting Xu, Yingchao Kou, Wen Li, Guangyu Lian, Jianshe Department of Odontology Umeå University Umeå90737 Sweden Key Lab of Bionic Engineering Ministry of Education Jilin University Changchun130022 China College of Mechanical and Electrical Engineering Northeast Forestry University Harbin150042 China State Key Laboratory of Advanced Vehicle Integration and Control China FAW Group Co. LTD Changchun130013 China Key Laboratory of Automobile Materials Ministry of Education College of Materials Science and Engineering Jilin University Changchun130025 China

Magnesium alloy is a promising biodegradable metal material for hard tissue engineering. However, its high corrosion rate limits its application. In our previous study, we biomimetically deposited a calcium carbonate coating on the surface of magnesium alloy using siloxane induction. This calcium carbonate coating demonstrated excellent in vitro biocompatibility and provided partial protection for the magnesium alloy substrate. In this study, we further enhanced the corrosion resistance of the calcium carbonate coating by treating it with stearic acid and its derivative, sodium stearate. Electrochemical corrosion tests revealed that the sodium stearate-treated calcium carbonate coating reduced the corrosion rate by two orders of magnitude. Additionally, in vitro biocompatibility assessments showed that while the biocompatibility of the sodium stearate-treated coating was slightly reduced, it remained acceptable compared to the magnesium substrate. This study builds on our previous work and offers a promising reinforcement strategy for degradable magnesium alloys in medical applications. © 2025

关键词： Corrosion resistant coatings

来源：评论

学校读者我要写书评

暂无评论

Effects of Welding Factors on Liquid Metal Embrittlement Cracking during Resistance Spot Welding of Zinc-coated High-strength Steel

引用

ISIJ International 2025年第1期65卷 117-126页

作者： Yu, Yang Zhang, Yongqiang Zhang, Tianyue Cao, Guangxiang Chen, Weixuan Research Institute of Technology of Shougang Group Co. Ltd. Beijing100043 China Beijing Key Laboratory of Green Recycling Process for Iron & Steel Production Technology Beijing100043 China Beijing Engineering Research Center of Energy Steel Beijing100043 China Shougang Jingtang United Iron and Steel Co. Ltd. Tangshan063200 China National Key Laboratory of Advanced Vehicle Integration & Control China FAW Group Co. Ltd Changchun130013 China

During resistance spot welding of zinc-coated advanced high-strength steels (AHSS), cracks which are promoted by liquid metal embrittlement (LME) may occur. According to previous researches, welding current, welding time, electrode tip diameter and electrode misalignment angle are significant factors on LME cracking. In this study, the effects of these four factors on LME cracking were compared with an orthogonal design experiment. After welding, numbers and lengths of cracks were measured, and Crack Index (CI) of each experiment group was calculated for comparison. As the result, two types of LME cracks, i.e., Type A cracks located at the indentation of electrode tip and Type B cracks located at the indentation of electrode shoulder were observed. The order of influence degree on CI of Type A crack from high to low was welding current > electrode tip diameter > electrode misalignment angle > welding time. The order of influence degree on CI of Type B crack was electrode tip diameter > electrode misalignment angle > welding time > welding current. The result reveals that modifying welding current is the most effective way to reduce Type A cracks and optimizing the electrode tip diameter is significant for preventing Type B cracks. © 2025 The Iron and Steel Institute of Japan.

关键词： Zinc coatings

来源：评论

学校读者我要写书评

暂无评论

Flexible anchor-based trajectory prediction for different types of traffic participants in autonomous driving systems

引用

Expert Systems with Applications 2025年 282卷

作者： Tang, Yingjuan He, Hongwen Wang, Yong Wu, Yifan School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China National Key Laboratory of Advanced Vehicle Integration and Control Beijing Institute of Technology Beijing100081 China

The task of trajectory prediction is a critical component of autonomous vehicle systems. Existing trajectory prediction methodologies encounter challenges in effectively handling varied traffic participant categories and accurately forecasting long-term trajectories. In response, we introduce the Fourier Transformer Prediction (FTP) framework, which integrates the Fourier transform and a flexible anchor approach. The Fourier transform encoder adeptly captures temporal and spectral domain features inherent in trajectory data across diverse categories. The flexible anchor method employs a proposal module without anchors to generate adaptable coarse trajectories, complemented by an anchor-based module for subsequent refinement. FTP adeptly models the characteristics of multi-class participants, enhancing training stability and mitigating issues such as mode collapse. Through extensive experiments conducted on public datasets and the proposed Traffic Route Bus trajectory prediction dataset (TRB), FTP demonstrates superior performance, underscoring its efficacy across diverse traffic scenarios. © 2025

关键词： Autonomous vehicles

来源：评论

学校读者我要写书评

暂无评论

Comprehensive Perturbation Consistency for Semi-Supervised Change Detection in Remote Sensing Images

Comprehensive Perturbation Consistency for Semi-Supervised C...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Zan Mao Xin Li Ze Luo Yingjuan Tang Dongmei Jiang Computer Network Information Center Chinese Academy of Sciences University of the Chinese Academy of Sciences PengCheng Laboratory National Key Laboratory of Advanced Vehicle Integration and Control Beijing Institute of Technology

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Currently, many change detection (CD) methods rely on supervised learning, which necessitates extensive manually annotated data, resulting in significant labor and time requirements. Recently, semi-supervised (SS) approaches have emerged in the CD community, which exploit large amounts of unlabeled data by utilizing consistency regularization. However, these methods do not consider the broader perturbation consistency to confer better generalization of the model. In this paper, we propose a novel SS CD framework with a comprehensive perturbation consistency called CPC, which extends perturbation consistency to the entire learning period. Specifically, our CPC combines the input, feature, and network perturbations for comprehensive perturb space. And, we design two distinct structures in practice, decoupled CPC and coupled CPC. Furthermore, we propose a change-aware input perturbation that introduces expensive annotation information to further expand the input perturb space. Extensive experiments conducted on the WHUCD, and GZ-CD datasets demonstrate that the proposal performs favorably against the state-of-the-art methods.

关键词： Codes Annotations Perturbation methods Supervised learning Signal processing Acoustics Proposals Labeling Speech processing Remote sensing

来源：评论

学校读者我要写书评

暂无评论

RGB-Based Category-Level Object Pose Estimation via Depth Recovery and Adaptive Refinement

引用

IEEE Robotics and Automation Letters 2025年第6期10卷 5377-5384页

作者： Yang, Hui Sun, Wei Liu, Jian Zheng, Jin Zeng, Zhiwen Mian, Ajmal Hunan University National Engineering Research Center for Robot Visual Perception and Control Technology College of Electrical and Information Engineering Changsha410082 China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha410082 China Central South University School of Architecture and Art Changsha410082 China University of Western Australia Department of Computer Science and Software Engineering CrawleyWA6009 Australia

Category-level pose estimation methods have received widespread attention as they can be generalized to intra-class unseen objects. Although RGB-D-based category-level methods have made significant progress, reliance on depth image limits practical application. RGB-based methods offer a more practical and cost-effective solution. However, current RGB-based methods struggle with object geometry perception, leading to inaccurate pose estimation. We propose depth recovery and adaptive refinement for category-level object pose estimation from a single RGB image. We leverage DINOv2 to reconstruct the coarse scene-level depth from the input RGB image and propose an adaptive refinement network based on an encoder-decoder architecture to dynamically improve the predicted coarse depth and reduce its gap from the ground truth. We introduce a 2D–3D consistency loss to ensure correspondence between the point cloud obtained from depth projection and the objects in the 2D image. This consistency supervision enables the model to maintain alignment between the depth image and the point cloud. Finally, we extract features from the refined point cloud and feed them into two confidence-aware rotation regression branches and a translation and size prediction residual branch for end-to-end training. Decoupling the rotation matrix provides a more direct representation, which facilitates parameter optimization and gradient propagation. Extensive experiments on the REAL275 and CAMERA25 datasets demonstrate the superior performance of our method. Real-world estimation and robotic grasping experiments demonstrate our model robustness to occlusion, clutter environments, and low-textured objects. Our code and robotic grasping video are available at DA-Pose. © 2016 IEEE.

关键词： Depth perception

来源：评论

学校读者我要写书评

暂无评论

Kriging-assisted valid-screening optimization (KVSO) to study optimal steering strategies for multi-struts aircraft

引用

Aerospace Science and Technology 2025年 162卷

作者： Shi, XiaZheng Nie, Hong Zhang, Ming Gui, XiWen Zheng, YuTing Xu, YuHan Hu, TianYang State Key Laboratory of Mechanics and Control for Aerospace Structures College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China

During ground maneuvering of multi-strut aircraft (MSA), certain main landing gears (MLGs) require steering capabilities to coordinate with the nose landing gears (NLGs) for minimizing steering radius and maintaining stability. Inappropriate MLG steering angles may lead to tire sideslip and potential aircraft rollover in extreme cases. This article presents a Kriging-assisted valid-screening optimization (KVSO) method for predicting optimal steering strategies of MSA under complex constraints, determining optimal coordination angles for the MLGs. The proposed method first introduces a penalty-based pre-screening filter (PBPF) mechanism that selects samples by comprehensively evaluating multiple constraint violations, thereby enhancing the algorithm's optimization efficiency. Subsequently, a valid constraint screening (VCS) mechanism, based on normal distribution principles, is proposed to reduce computational costs. Furthermore, a region of interest sampling surrogate model update mechanism is developed based on the constraint boundary sampling (CBS) criterion. This mechanism constructs high-precision surrogate models for both optimization objective regions and constraint boundaries, thus accelerating global optimization convergence. The effectiveness of the proposed method is validated through two engineering case studies. The results demonstrate superior computational efficiency and optimization accuracy in resolving the optimal steering strategy for MSA. This method provides theoretical foundations for MLGs steering angle design. © 2025 Elsevier Masson SAS

关键词： Normal distribution

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：