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Highly Differentiated Target Detection under Extremely Low-Light Conditions Based on Improved YOLOX Model

Computer Modeling in Engineering & Sciences 2024年第8期140卷 1507-1537页

作者： Haijian Shao Suqin Lei Chenxu Yan Xing Deng Yunsong Qi School of Computer Jiangsu University of Science and TechnologyZhenjiang212003China Department of Electrical and Computer Engineering University of NevadaLas VegasNV89154USA zhejiang geely Automobile research institute Ningbo315336China

This paper expounds upon a novel target detection methodology distinguished by its elevated discriminatory efficacy,specifically tailored for environments characterized by markedly low luminance *** methodologies struggle with the challenges posed by luminosity fluctuations,especially in settings characterized by diminished radiance,further exacerbated by the utilization of suboptimal imaging *** envisioned approach mandates a departure from the conventional YOLOX model,which exhibits inadequacies in mitigating these *** enhance the efficacy of this approach in low-light conditions,the dehazing algorithm undergoes refinement,effecting a discerning regulation of the transmission rate at the pixel level,reducing it to values below 0.5,thereby resulting in an augmentation of image ***,the coiflet wavelet transform is employed to discern and isolate high-discriminatory attributes by dismantling low-frequency image attributes and extracting high-frequency attributes across divergent *** utilization of CycleGAN serves to elevate the features of low-light imagery across an array of stylistic *** computational methodologies are then employed to amalgamate and conflate intricate attributes originating from images characterized by distinct stylistic orientations,thereby augmenting the model’s erudition *** validation conducted on the PASCAL VOC and MS COCO 2017 datasets substantiates pronounced *** refined low-light enhancement algorithm yields a discernible 5.9%augmentation in the target detection evaluation index when compared to the original *** Average Precision(mAP)undergoes enhancements of 9.45%and 0.052%in low-light visual renditions relative to conventional YOLOX *** envisaged approach presents a myriad of advantages over prevailing benchmark methodologies in the realm of target detection within environments marked by an acute scarcity of lumi

关键词： Target detection extremely low-light wavelet transformation highly differentiated features YOLOX

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An Underwater Biomimetic Robot that can Swim,Bipedal Walk and Grasp

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Journal of Bionic Engineering 2024年第3期21卷 1223-1237页

作者： Qiuxuan Wu Liwei Pan FuLin Du ZhaoSheng Wu XiaoNi Chi FaRong Gao Jian Wang Anton A.Zhilenkov School of Automation Hangzhou Dianzi UniversityHangzhou310018China International Joint research Laboratory for Autonomous Robotic Systems Hangzhou310018China geely Automotive institute Hangzhou Vocational and Technical CollegeHangzhou310018China institute of Hydrodynamics and Control Processes Sankt-Petersburg Saint Petersburg State Marine Technical UniversitySankt-PetersburgRussia

In developing and exploring extreme and harsh underwater environments,underwater robots can effectively replace humans to complete *** meet the requirements of underwater flexible motion and comprehensive subsea operation,a novel octopus-inspired robot with eight soft limbs was designed and *** robot possesses the capabilities of underwater bipedal walking,multi-arm swimming,and grasping *** closely interact with the underwater seabed environment and minimize disturbance,the robot employs a cable-driven flexible arm for its walking in underwater floor through a bipedal walking *** multi-arm swimming offers a means of three-dimensional spatial movement,allowing the robot to swiftly explore and navigate over large areas,thereby enhancing its ***,the robot’s walking arm enables it to grasp and transport objects underwater,thereby enhancing its practicality in underwater environments.A simplified motion models and gait generation strategies were proposed for two modes of robot locomotion:swimming and walking,inspired by the movement characteristics of octopus-inspired multi-arm swimming and bipedal *** experimental verification,the robot’s average speed of underwater bipedal walking reaches 7.26 cm/s,while the horizontal movement speed for multi-arm swimming is 8.6 cm/s.

关键词： Underwater soft robots Underwater bipedal walking Multi-arm swimming Cable drive

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Carbody Structural Lightweighting Based on Implicit Parameterized Model

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Chinese Journal of Mechanical Engineering 2014年第3期27卷 483-487页

作者： CHEN Xin MA Fangwu WANG Dengfeng XIE Chen State Key Laboratory of Automotive Simulation and Control Jilin University zhejiang geely Automobile research institute Co. Ltd

Most of recent research on carbody lightweighting has focused on substitute material and new processing technologies rather than structures. However, new materials and processing techniques inevitably lead to higher costs. Also, material substitution and processing lightweighting have to be realized through body structural profiles and locations. In the huge conventional workload of lightweight optimization, model modifications involve heavy manual work, and it always leads to a large number of iteration calculations. As a new technique in carbody lightweighting, the implicit parameterization is used to optimize the carbody structure to improve the materials utilization rate in this paper. The implicit parameterized structural modeling enables the use of automatic modification and rapid multidisciplinary design optimization （MDO） in carbody structure, which is impossible in the traditional structure finite element method （FEM） without parameterization. The structural SFE parameterized model is built in accordance with the car structural FE model in concept development stage, and it is validated by some structural performance data. The validated SFE structural parameterized model can be used to generate rapidly and automatically FE model and evaluate different design variables group in the integrated MDO loop. The lightweighting result of body-in-white （BIW） after the optimization rounds reveals that the implicit parameterized model makes automatic MDO feasible and can significantly improve the computational efficiency of carbody structural lightweighting. This paper proposes the integrated method of implicit parameterized model and MDO, which has the obvious practical advantage and industrial significance in the carbody structural lightweighting design.

关键词： carbody structural lightweighting implicit parameterization MDO BIW

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Performance of the Transmission Parking Mechanism of a Battery Electric Vehicle Simulated with Adams Software

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Automotive Innovation 2018年第2期1卷 114-121页

作者： Yuan Dong Yong Chen Chuang Yu Zhan Cao Guangxin Li Zhuoqiang Li Genqun Cui School of Mechanical Engineering Hebei University of TechnologyTianjin 300130China powertrain research institute GeelyHangzhou Bay 315336China

The electric parking mechanism is studied for an electrically controlled two-speed auto transmission that is being developed for electric *** requirements include low-speed safe parking,reliable self-lock and the avoidance of abnormal parking.A dynamic model of the parking mechanism is established and analyzed using Adams ***,failure of the parking mechanism due to wear is observed in bench testing and compared with experimental results after optimization.

关键词： Battery electric vehicle Two-speed auto transmission Parking mechanism Safety performance

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Static Shift Performance Evaluation Index and Optimization Measures for Manual Transmission in Passenger Car

Static Shift Performance Evaluation Index and Optimization M...

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2015中国汽车工程学会年会

作者： Zhaoyang Zou Yong Chen Hua Chen Xiumei Li Daguo Luo zhejiang geely powertrain research institute

Static shift performance evaluation index and optimization measures for manual transmission in passenger car were *** objective evaluation applied to static shift performance was proposed based on subjective evaluation requirement The optimization method for static shift performance was proposed as *** verify the effectiveness of relevant conclusion and the reliability of relevant analysis methods,the static shift performance for manual transmission in passenger car was analyzed through simulation and testing.

关键词： transmission static shift performance simulated analysis objective evaluation

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Deformation mechanism and forming properties of 6061Al alloys during compression in semi-solid state

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1725-1730页

作者：尚淑珍路贵民唐小玲赵祖欣吴成明 Key Laboratory of Safety Science of Pressurized System Ministry of EducationEast China University of Science and Technology zhejiang geely Automobile research institute Co. Ltd.

The 6061 semi-solid aluminium alloy feedstocks prepared by near-liquidus casting were compressed in semi-solid state by means of Gleeble-3500 thermal-mechanical *** relationship between the true stress and the true strain at different temperatures and strain rates was studied with the deformation degree of 70%.The microstructures during the deformation process were *** deformation mechanism and thixo-forming properties of the semi-solid alloys were *** results show that the homogeneous and non-dendrite microstructures of semi-solid 6061Al alloy manufactured by near-liquidus casting technology could be transformed into semi-solid state with the microstructure suitable for thixo-forming which are composed of near-spherical grains and liquid phase with eutectic composition through reheating *** deformation temperature and strain rate affect the peak stress significantly rather than steady flow *** resistance to deformation in semi-solid state decreases with the increase of the deformation temperature and decrease of the strain *** steady thixotropic deformation stage, the thixotropic property is uniform, and the main deformation mechanism is the rotating or sliding between the solid particles and the plastic deformation of the solid particles.

关键词：半固态铝合金 6061铝合金变形机制成形性能压缩热模拟实验机变形温度触变变形

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Valve Train Dynamic Design and Verification

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International Journal of Plant Engineering and Management 2022年第4期27卷 232-243页

作者： CAO Xu YIN Jiandong LIU Shengqiang YAO Junwei Ningbo geely Royal Engine Components Co. Ltd.Ningbo 315400ZhejiangChina

Valve train dynamic behaviors need to be considered at the beginning of the engine mechanical design,especially during choosing valve spring *** parameter definition to simulation,the valve train parameters around dynamic performance are determined step by *** valve train dynamic test is done finally to verify the design result since it is a such important facet for valve train *** reliability from mass production and product life view must be considered during whole design process too.

关键词： valve train dynamic simulation dynamic verification

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A study on light-aging resistance of instrument panel materials and bumper materials on the automobile

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Engineering Sciences 2014年第3期12卷 43-47页

作者： Wang Wentao Liu Qiang Li Li Li Huilian zhejiang geely Automobile research institute Co. Ltd.

The light-aging test method commonly used in the automotive industry is utilized to carry out light- aging research on automotive instrument panel （IP） materials and bumper materials. On one hand, the impacts of common light-aging test methods on aging degree of automotive component materials are reviewed; on the other hand, the light-aging resistances of different component materials are compared. The results show that, for light-aging behavior of IP materials, the aging degree of the third test method is not severer than that of the second method, but it is severer than that of the first method. The light-aging resistance of IP material A is al- most the same as that of IP material B. With reference to light-aging behavior of bumper materials, the aging de- gree of three common test methods indicates that the aging degree of the sixth test method is not severer than that of the fourth method, but it is severer than that of the fifth method. The light-aging resistance of bumper material D is superior to that of bumper material C.

关键词： automobile IP materials bumper materials light-aging resistance color difference gloss

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research on Development Process of 7 Speed Wet Dual Clutch Transmission

Research on Development Process of 7 Speed Wet Dual Clutch T...

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FISITA 2012 World Automotive Congress--Volume 5:Advanced Transmission System and Driveline

作者： Yong Chen Mike Turner Michael Gilcrist Wenjiang Zhao Daguo Luo Fuquan Zhao zhejiang geely Automobile research institute CO. LTD

Seven speed wet dual clutch automatic transmission is a product characterized by an integration of electrics,mechanics and *** optimized efficiency,good NVH performance and durability low cost are considered during the *** order to save time and optimize design,process development research method based on simulation model is ***,basic test is combined to guarantee validity of simulation ***,design process is optimized.

关键词： Dual clutch transmission(DCT) Dual clutch DCTF NVH analysis Basic test

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Study on Lightweight of Vehicle Body Structure Based on Implicit Parametric Model

Study on Lightweight of Vehicle Body Structure Based on Impl...

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The FISITA 2012 World Automotive Congress--Volume 7:Vehicle Design and Testing(Ⅰ)

作者： Jiyou Zhang Shudan Liu Hong Peng Yongxin Men Fuquan Zhao zhejiang geely Automobile research institute Co.Ltd

In the early development phase of a passenger *** implicit parametric model of the lower body of BIW was built by SHE CONCEPT and combined with the finite element model of other parts of BIW to compose the parametric BIW *** an Optimus workflow including BIW stiffness and vibration mode,design variables and their effective range were defined based on engineering experiences and vehicle features.A Response Surface Model（RSM） was created through Design of Experiments（DOE）,and effects of key parameters of BIW structure on the stiffness and vibration mode were *** global optimization was conducted,and the lightweight vehicle body structure in compliance with performance requirements of modal and stiffness purposes was obtained,which saved 11.35 kg（154.55→143.20 kg） and lightweight effect was 7.34%.

关键词： Body-in-white Implicit parametric model Stiffness Vibration mode

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