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Carbody Structural Lightweighting Based on Implicit Parameterized Model

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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Simulation on a Car Interior Aerodynamic Noise Control Based on Statistical Energy Analysis

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Chinese Journal of Mechanical Engineering 2012年第5期25卷 1016-1021页

作者： CHEN Xin WANG Dengfeng MA Zhengdong State Key Laboratory of automotive Simulation and Control Jilin University Changchun 130022 China Zhengjiang geely Automobile institute Co. Ltd. Hangzhou 311228 China College of Engineering University of Michigan Ann Arbor MI48109 USA

How to simulate interior aerodynamic noise accurately is an important question of a car interior noise reduction. The unsteady aerodynamic pressure on body surfaces is proved to be the key effect factor of car interior aerodynamic noise control in high frequency on high speed. In this paper, a detail statistical energy analysis （SEA） model is built. And the vibra-acoustic power inputs are loaded on the model for the valid result of car interior noise analysis. The model is the solid foundation for further optimization on car interior noise control. After the most sensitive subsystems for the power contribution to car interior noise are pointed by SEA comprehensive analysis, the sound pressure level of car interior aerodynamic noise can be reduced by improving their sound and damping characteristics. The further vehicle testing results show that it is available to improve the interior acoustic performance by using detailed SEA model, which comprised by more than 80 subsystems, with the unsteady aerodynamic pressure calculation on body surfaces and the materials improvement of sound/damping properties. It is able to acquire more than 2 dB reduction on the central frequency in the spectrum over 800 Hz. The proposed optimization method can be looked as a reference of car interior aerodynamic noise control by the detail SEA model integrated unsteady computational fluid dynamics （CFD） and sensitivity analysis of acoustic contribution.

关键词： car interior aerodynamic noise control computational fluid dynamics statistical energy analysis

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Research status and progress of hot stamping

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Engineering Sciences 2012年第6期10卷 51-61页

作者： Song Leifeng Ma Mingtu Guo Yihui Fang Gang Liu Qiang Yao Zaiqi China automotive Engineering Research institute Co.Ltd. geely Automobile Research institute

In this article,current application,materials,key equipments,finite element(FE) simulation and parts properties of hot stamping are *** investigations of all processes and further excellent processes are *** survey of existing works,especially key equipments has revealed several *** new ideas and programs are proposed on the basis of traditional *** article aims at providing an insight into a whole process backgrounds and pointing out the great potential for further investigations and innovations of hot stamping.

关键词： hot stamping process material equipment simulation

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VCANet:Vanishing-Point-Guided Context-Aware Network for Small Road Object Detection

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automotive Innovation 2021年第4期4卷 400-412页

作者： Guang Chen Kai Chen Lijun Zhang Liming Zhang Alois Knoll Tongji University ShanghaiChina Technical University of Munich MunichGermany geely Research institute HangzhouChina

Advanced deep learning technology has made great progress in generic object detection of autonomous driving,yet it is still challenging to detect small road hazards in a long distance owing to lack of large-scale small-object datasets and dedicated *** work addresses the challenge from two ***,a self-collected long-distance road object dataset(TJ-LDRO)is introduced,which consists of 109,337 images and is the largest dataset so far for the small road object detection ***,a vanishing-point-guided context-aware network(VCANet)is proposed,which utilizes the vanishing point prediction block and the context-aware center detection block to obtain semantic *** multi-scale feature fusion pipeline and the upsampling block in VCANet are introduced to enhance the region of interest(ROI)*** experimental results with TJ-LDRO dataset show that the proposed method achieves better performance than the representative generic object detection *** work fills a critical capability gap in small road hazards detection for high-speed autonomous vehicles.

关键词： Autonomous driving Road hazard Object detection Deep learning Vanishing point

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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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Research on plastic fender development and key technologies

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Engineering Sciences 2012年第6期10卷 89-91页

作者： Yang Hao Li Li Liu Qiang Yang Anzhi Ma Fangwu Zhao Fuquan Guo Yihui Song Leifeng geely Automobile Research institute China automotive Engineering Research institute Co.Ltd.

automotive lightweight and safety performance come into play as key technologies to promote competiveness, and average applied amount of automotive plastics has become a significant sign for automotive industrial development level of a *** performances of a vehicle with plastic automotive fenders are analyzed in the *** research is emphasized on sinking-resistance and pedestrian protection performance of the plastic fenders by studying plastics characteristics and simulation *** offers references for engineering design in which both automotive lightweight and safety performance are achieved and well balanced.

关键词： plastic fender lightweight safety simulation analysis

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Simulation about hot stamping of ultra-high strength steel on the basis of lightweight technology

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Engineering Sciences 2012年第6期10卷 67-70页

作者： Liu Qiang Ma Fangwu Wang Xiaona Yao Zaiqi Song Wei Zhao Fuquan Ma Mingtu Song Leifeng geely Automobile Research institute China automotive Engineering Research institute Co.Ltd.

With the development of automobile lightweight,it is very necessary to apply the ultra-high strength steel parts manufactured by hot stamping,which offers the possibility to reduce the weight of automobiles and maintain the safety *** order to complete hot stamping,it is important to design the structure of parts reasonably,which is related with reasonable matching of *** objective of this paper is to guide the design of parts manufactured by hot stamping and find the forming technical requirements of vehicle *** experiments,the paper obtains the stress and strain curves at different deformation temperatures and strain *** on experimental data, the constitutive relationship model is established which can reflect the deformation capacity of ultra-high strength steel during the process of hot *** with finite element simulation results of hot stamping by commercial software AUTOFORM,transfer path of load and matching law of strength,the paper determines the design criteria and forming technical requirements of parts manufactured by hot *** the same time,the impact performance of front cross member internal plate is taken into consideration.

关键词： ultra-high strength steel hot stamping finite element simulation lightweight technology

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Research on application of plastic materials in cars

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Engineering Sciences 2012年第6期10卷 92-96页

作者： Jin Jianwei Ma Fangwu Liu Qiang Wu Tiannan Dong Ningning Zhao Fuguan Ma Mingtu Guo Yihui geely Automobile Research institute China automotive Engineering Research institute Co.Ltd.

This paper gives analysis of application status and prospect of plastic materials from the aspects of applied material amount comparison,development of new materials & new technologies,lightweight,design conception of new components,recyclability,simplification and diversity of materials,standardization of material specification and presents corresponding conclusions and suggestions.

关键词： plastic material lightweight application analysis environment protection

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Analysis and Engineering Optimization of the Exhaust Manifold Flow-induced Noise Under the Vehicle Acceleration Condition

Analysis and Engineering Optimization of the Exhaust Manifol...

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2022中国汽车工程学会年会暨展览会

作者： Zhang Jun Xu Yongjiang Song Hao geely automotive Research institute (Ningbo) Co. Ltd.

The exhaust manifold is an important engine *** meet the increasingly rigorous emission limitation regulations,the choice of stainless steel exhaust manifold is made in the automobile engine development,but the design and verification of exhaust manifold NVH performance are generally *** this paper,considering the abnormal noise of a vehicle under the condition of full acceleration,the investigation and analysis process of noise problems are described in *** mechanism of exhaust manifold flow-induced noise and the corresponding engineering countermeasures are proposed,and the effectiveness of the optimization schemes are verified by comparing measurement results and the vehicle subjective *** paper is potential reference valuable for improving the exhaust manifold NVH performance development.

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The Improvement of Relay Selection Schemes in Two-Hop Cellular Networks

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International Journal of Communications, Network and System Sciences 2017年第8期10卷 98-107页

作者： Hua Wu School of automotive Engineering Beijing Geely University Beijing China

In wireless networks, cooperative relaying could improve throughput by exploiting diversity. In order to reduce the amount of feedback for the channel gain, a semi-distributed scheme based on the relay feasible condition is proposed. Each relay node can measure its backward and forward channel gains. If both the channel gains are larger than a pre-defined threshold, this relay node is feasible. The final decision on the best relay selection is still given by the base station. Besides, the switch-and-examine relay selection scheme, which selects the first feasible relay node, is also investigated. Simulation results are presented to illustrate the advantage of two proposed schemes.

关键词： Relay Selection Cooperative Relaying Amplify-and-Forward Cellular Networks

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