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Acoustic analysis of lightweight auto-body based on finite element method and boundary element method

LIANG Xinhua, ZHU Ping, LIN Zhongqin, ZHANG Yan

《机械工程前沿（英文）》 2007年 第2卷 第1期   页码 99-103 doi: 10.1007/s11465-007-0017-7

摘要： A lightweight automotive prototype using alternative materials and gauge thickness is studied by a numerical method. The noise, vibration, and harshness (NVH) performance is the main target of this study. In the range of 1 150 Hz, the frequency response function (FRF) of the body structure is calculated by a finite element method (FEM) to get the dynamic behavior of the auto-body structure. The pressure response of the interior acoustic domain is solved by a boundary element method (BEM). To find the most contributing panel to the inner sound pressure, the panel acoustic contribution analysis (PACA) is performed. Finally, the most contributing panel is located and the resulting structural optimization is found to be more efficient.

关键词： harshness     automotive prototype     structural optimization     vibration     efficient    

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Calibration of catalyst temperature in automotive engines over coldstart operation in the presence of

Nasser L. AZAD,Ahmad MOZAFFARI

《机械工程前沿（英文）》 2015年 第10卷 第4期   页码 405-412 doi: 10.1007/s11465-015-0354-x

摘要：

The main scope of the current study is to develop a systematic stochastic model to capture the undesired uncertainty and random noises on the key parameters affecting the catalyst temperature over the coldstart operation of automotive engine systems. In the recent years, a number of articles have been published which aim at the modeling and analysis of automotive engines’ behavior during coldstart operations by using regression modeling methods. Regarding highly nonlinear and uncertain nature of the coldstart operation, calibration of the engine system’s variables, for instance the catalyst temperature, is deemed to be an intricate task, and it is unlikely to develop an exact physics-based nonlinear model. This encourages automotive engineers to take advantage of knowledge-based modeling tools and regression approaches. However, there exist rare reports which propose an efficient tool for coping with the uncertainty associated with the collected database. Here, the authors introduce a random noise to experimentally derived data and simulate an uncertain database as a representative of the engine system’s behavior over coldstart operations. Then, by using a Gaussian process regression machine (GPRM), a reliable model is used for the sake of analysis of the engine’s behavior. The simulation results attest the efficacy of GPRM for the considered case study. The research outcomes confirm that it is possible to develop a practical calibration tool which can be reliably used for modeling the catalyst temperature.

关键词： automotive engine     calibration     coldstart operation     Gaussian process regression machine (GPRM)     uncertainty and random noises    

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Smart product design for automotive systems

A. Galip ULSOY

《机械工程前沿（英文）》 2019年 第14卷 第1期   页码 102-112 doi: 10.1007/s11465-019-0527-0

摘要： Automobiles evolved from primarily mechanical to electro-mechanical, or mechatronic, vehicles. For example, carburetors have been replaced by fuel injection and air-fuel ratio control, leading to order of magnitude improvements in fuel economy and emissions. Mechatronic systems are pervasive in modern automobiles and represent a synergistic integration of mechanics, electronics and computer science. They are smart systems, whose design is more challenging than the separate design of their mechanical, electronic and computer/control components. In this review paper, two recent methods for the design of mechatronic components are summarized and their applications to problems in automotive control are highlighted. First, the combined design, or co-design, of a smart artifact and its controller is considered. It is shown that the combined design of an artifact and its controller can lead to improved performance compared to sequential design. The coupling between the artifact and controller design problems is quantified, and methods for co-design are presented. The control proxy function method, which provides ease of design as in the sequential approach and approximates the performance of the co-design approach, is highlighted with application to the design of a passive/active automotive suspension. Second, the design for component swapping modularity (CSM) of a distributed controller for a smart product is discussed. CSM is realized by employing distributed controllers residing in networked smart components, with bidirectional communication over the network. Approaches to CSM design are presented, as well as applications of the method to a variable-cam-timing engine, and to enable battery swapping in a plug-in hybrid electric vehicle.

关键词： mechatronics     automotive control     co-design     component swapping modularity     active suspensions     variable camshaft timing engine     plug-in hybrid electric vehicle    

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Life cycle analysis and choice of natural gas-based automotive alternative fuels in Chongqing Municipality

WU Rui, LI Guangyi, ZHANG Zongyi, REN Yulong, HAN Weijian

《环境科学与工程前沿（英文）》 2007年 第1卷 第3期   页码 292-298 doi: 10.1007/s11783-007-0049-6

摘要： Road transport produces significant amounts of emissions by using crude oil as the primary energy source. A reduction of emissions can be achieved by implementing alternative fuel chains. The objective of this study is to carry out an economic, environmental and energy (EEE) life cycle study on natural gas-based automotive fuels with conventional gasoline in an abundant region of China. A set of indices of four fuels/vehicle systems on the basis of life cycle are assessed in terms of impact of EEE, in which natural gas produces compressed natural gas (CNG), methanol, dimethylether (DME) and Fischer Tropsch diesel (FTD). The study included fuel production, vehicle production, vehicle operation, infrastructure and vehicle end of life as a system for each fuel/vehicle system. A generic gasoline fueled car is used as a baseline. Data have been reviewed and modified based on the best knowledge available to Chongqing local sources. Results indicated that when we could not change electric and hydrogen fuel cell vehicles into commercial vehicles on a large scale, direct use of CNG in a dedicated or bi-fuel vehicle is an economical choice for the region which is most energy efficient and more environmental friendly. The study can be used to support decisions on how natural gas resources can best be utilized as a fuel/energy resource for automobiles, and what issues need to be resolved in Chongqing. The models and approaches for this study can be applied to other regions of China as long as all the assumptions are well defined and modified to find a substitute automotive energy source and establish an energy policy in a specific region.

关键词： dedicated     primary     economic     alternative     abundant    

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升沉补偿装置虚拟样机协同设计及仿真分析

吕东,何将三,刘少军,黄锴

《中国工程科学》 2004年 第6卷 第3期   页码 36-40

摘要：

采用参数并行集成化方法设计深海采矿升沉补偿装置的虚拟样机，并进行了虚拟试验仿真研究，探讨协同设计在复杂机电系统中的具体应用，为深海开采系统总体设计提供设计理论参考。

关键词： 升沉补偿     虚拟样机     协同设计     仿真    

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三峡船闸完建期156 m蓄水位4级运行方式原型调试研究

胡亚安,张瑞凯,李云

《中国工程科学》 2009年 第11卷 第9期   页码 52-58

摘要：

从水力学条件论证了船闸采用4级运行方案的可行性。通过原型调试，采取中间及阐首优化后的输水方式运行，基本消除了闸室第一分流口空化，船闸在超过设计的45.2 m水头下工作条件较好，在三峡船闸完建期156 m蓄水位船闸采用4级运行方式具优越性。

关键词： 三峡船闸     运行方式     原型调试    

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综论大坝原型反分析及其应用

顾冲时,吴中如

《中国工程科学》 2001年 第3卷 第8期   页码 76-81

摘要：

在研究大坝原型反分析及其应用研究现状的基础上，提出了反分析中急待解决的热点问题，并对这些热点问题进行了探讨，介绍了一些新的分析理论和方法。

关键词： 大坝     原型反分析     应用    

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On the Innovation, Design, Construction, and Experiments of OMEGA-Based SSPS Prototype: The Sun Chasing Article

Baoyan Duan, Yiqun Zhang, Guangda Chen, Ze Zhao, Jianwei Mi, Xun Li, Lin Yang, Xi Li

《工程（英文）》 doi: 10.1016/j.eng.2023.11.007

摘要：

 

This study systematically introduces the development of the world's first full-link and full-system ground demonstration and verification system for the OMEGA space solar power satellite (SSPS). First, the OMEGA 2.0 innovation design was proposed. Second, field-coupling theoretical models of sunlight concentration, photoelectric conversion, and transmitting antennas were established, and a systematic optimization design method was proposed. Third, a beam waveform optimization methodology considering both a high beam collection efficiency and a circular stepped beam shape was proposed. Fourth, a control strategy was developed to control the condenser pointing toward the sun while maintaining the transmitting antenna toward the rectenna. Fifth, a high-efficiency heat radiator design method based on bionics and topology optimization was proposed. Sixth, a method for improving the rectenna array’s reception, rectification, and direct current (DC) power synthesis efficiencies is presented. Seventh, high-precision measurement technology for high-accuracy beam-pointing control was developed. Eighth, a smart mechanical structure was designed and developed. Finally, the developed SSPS ground demonstration and verification system has the capacity for sun tracking, a high concentration ratio, photoelectric conversion, microwave conversion and emission, microwave reception, and rectification, and thus satisfactory results were obtained.

关键词： OMEGA-SSPS     Full-link and full-system Beam collection efficiency     Circular stepped beam shape     Smart structure     Field coupling theoretical model     Beam pointing control    

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Automotive revolution and carbon neutrality

《能源前沿（英文）》   页码 693-703 doi: 10.1007/s11708-023-0890-8

摘要： The automotive industry is in the midst of a groundbreaking revolution, driven by the imperative to achieve intelligent driving and carbon neutrality. A crucial aspect of this transformation is the transition to electric vehicles (EVs), which necessitates widespread changes throughout the entire automotive ecosystem. This paper examines the challenges and opportunities of this transition, including automotive electrification, intelligence-connected transportation system, and the potential for new technologies such as hydrogen fuel cells. Meanwhile, it discusses the key technologies and progress of the hydrogen energy industry chain in the upstream hydrogen production, midstream hydrogen storage and transportation, downstream hydrogen station construction and hydrogen fuel cells in turn. Finally, it proposes the directions for future layout, providing guidance for future development.

关键词： automotive revolution     electric vehicles (EVs)     hydrogen energy     fuel cell    

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Biological chip technology to quickly batch select optimum cryopreservation procedure

YU Lina, LIU Jing, ZHOU Yixin, HUA Zezhao

《能源前沿（英文）》 2007年 第1卷 第3期   页码 316-321 doi: 10.1007/s11708-007-0046-2

摘要： In the practices of cryobiology, selection of an optimum freeze/thawing program and an idealistic cryoprotective agent often requires rather tedious, time consuming and repetitive tests. Integrating the functions of sample preparation and viability detection, the concept of biochip technology was introduced to the field of cryopreservation, aiming at quickly finding an optimum freezing and thawing program. Prototype devices were fabricated and corresponding experimental tests were performed. It was shown that microflow-channel chip could not offer a high quality solution distribution. As an alternative, the spot-dropping chip proved to be an excellent way to load the sample quickly and reliably. Infrared thermal mapping on such a chip showed that it had a rather uniform heat transfer boundary. Applying the spot-dropping chip combined with the thermoelectric cooling device, the final output of cryopreservation of multiple samples was tested, and the optimal freeze/thawing program as well as the potentially best concentration of the cryoprotective agent was found by analyzing the results. Further, application of this technique to measure the thermo-physical properties of the cryo-protective agent was also investigated. The study demonstrated that a biochip with integrated automatic loading and inspection units opens the possibility of a massive optimization of the complex cryopreservation program in a quicker and more economical way.

关键词： idealistic cryoprotective     concentration     Prototype     technology     alternative    

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钛在汽车工业中的应用及降低钛材成本的工艺

杨遇春

《中国工程科学》 2005年 第7卷 第8期   页码 9-17

摘要：

叙述了钛在减轻汽车自重、节约燃油、保护环境、降低噪声、提高汽车性能方面的优势和应用领域及趋势。介绍并评价了几种降低海绵钛与钛材成本的工艺技术。

关键词： 钛     汽车用钛材     钛冶金新工艺    

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新时代汽车强国战略研究综述（一）

钟志华,乔英俊,王建强,杨沿平,杨波,王东升,赵世佳,邓慧

《中国工程科学》 2018年 第20卷 第1期   页码 1-10 doi: 10.15302/J-SSCAE-2018.01.001

摘要：

本文为中国工程院“汽车强国战略研究”综述的第一部分（共两部分），对汽车发展总体情况进行了梳理，分析了我国汽车发展面临的新形势和新动态，总结出我国迎来建设汽车强国新一轮重大机遇。在此基础上，阐明了新时代“汽车强国”的内涵，提出了汽车产业提质增效和汽车社会协调发展是新时代“汽车强国”的两个主要特征。最后从十个方面论述了新时代建设汽车强国的重要意义。

关键词： 汽车强国     汽车产业     汽车社会    

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A prototype online database-enabled design framework for wind analysis/design of low-rise buildings

Dae Kun KWON,Ahsan KAREEM,Deepak KUMAR,Yukio TAMURA

《结构与土木工程前沿（英文）》 2016年 第10卷 第1期   页码 121-130 doi: 10.1007/s11709-015-0329-3

摘要： This study presents a development of an advanced cyberbased database-enabled design module for low-rise buildings (DEDM-LR) which provides estimation of the wind-induced responses for main wind force resisting frames by making direct use of pressure time histories measured at a large number of pressure taps over a suite of building models. These responses may be considered in lieu of code-specified load effects in which the overall accuracy may be influenced by the inherent simplifications in codes. In addition, this new automated approach is particularly attractive and advantageous as it allows a web-based online analysis/design via intuitive user-friendly interfaces for both the input and output in terms of familiar web-style forms that are nowadays very common in most of web-based services. Presently, the DEDM-LR hosts an aerodynamic database developed by the Tokyo Polytechnic University (TPU), Japan for a variety of building configurations like flat, gable, and hip roofs under suburban terrain flow condition with immediate application to other databases. The paper shows the efficacy and validity of the DEDM-LR by walking through its details and examples on selected gable-roofed buildings. The architecture of DEDM-LR platform offers the ability to pool resources by hosting other databases that may become available in the near future.

关键词： wind loads     low-rise building     pressure measurement     aerodynamics     building design     structural response     building codes     information technology (IT)    

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水下盾构法铁路隧道管片衬砌结构的原型加载试验研究

何川,封坤,晏启祥,齐春

《中国工程科学》 2012年 第14卷 第10期   页码 65-72

摘要：

针对我国第一条水下铁路盾构法隧道——狮子洋隧道，采用“多功能盾构隧道结构体试验系统”装置原型管片衬砌结构，在通缝和错缝不同的拼装方式下进行了原型结构加载试验，对其结构力学性能进行深入探讨。试验结果表明，不同水压条件下管片衬砌结构力学特征不同，尤其是当结构开裂后，高水压对于结构内力与形变的发展有明显的减缓作用。狮子洋隧道采用的榫式接头管片结构在通缝与错缝拼装下的破坏特征不同，通缝拼装时结构在高水压条件下纵缝附近区域易发生局部剪切破坏，该研究成果可为同类工程的设计提供有价值的参考。

关键词： 水下盾构法铁路隧道     管片衬砌结构     原型试验     榫式接头     破坏特征    

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Recycling polymeric waste from electronic and automotive sectors into value added products

Abhishek Kumar, Veena Choudhary, Rita Khanna, Romina Cayumil, Muhammad Ikram-ul-Haq, Veena Sahajwalla, Shiva Kumar I. Angadi, Ganapathy E. Paruthy, Partha S. Mukherjee, Miles Park

《环境科学与工程前沿（英文）》 2017年 第11卷 第5期 doi: 10.1007/s11783-017-0991-x

摘要： The environmentally sustainable disposal and recycling of ever increasing volumes of electronic waste has become global waste management issue. The addition of up to 25% polymeric waste PCBs (printed circuit boards) as fillers in polypropylene (PP) composites was partially successful: while the tensile modulus, flexural strength and flexural modulus of composites were enhanced, the tensile and impact strengths were found to decrease. As a lowering of impact strength can significantly limit the application of PP based composites, it is necessary to incorporate impact modifying polymers such as rubbery particles in the mix. We report on a novel investigation on the simultaneous utilization of electronic and automotive rubber waste as fillers in PP composites. These composites were prepared by using 25 wt.% polymeric PCB powder, up to 9% of ethylene propylene rubber (EPR), and PP: balance. The influence of EPR on the structural, thermal, mechanical and rheological properties of PP/PCB/EPR composites was investigated. While the addition of EPR caused the nucleation of the β crystalline phase of PP, the onset temperature for thermal degradation was found to decrease by 8%. The tensile modulus and strength decreased by 16% and 19%, respectively; and the elongation at break increased by ~71%. The impact strength showed a maximum increase of ~18% at 7 wt.%–9 wt.% EPR content. Various rheological properties were found to be well within the range of processing limits. This novel eco-friendly approach could help utilize significant amounts of polymeric electronic and automotive waste for fabricating valuable polymer composites.

关键词： E-waste     Polymer composites     Recycling     Rubber     Waste PCBs     Filler    

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标题 作者 时间 类型 操作

Acoustic analysis of lightweight auto-body based on finite element method and boundary element method

LIANG Xinhua, ZHU Ping, LIN Zhongqin, ZHANG Yan

期刊论文

Calibration of catalyst temperature in automotive engines over coldstart operation in the presence of

Nasser L. AZAD,Ahmad MOZAFFARI

期刊论文

Smart product design for automotive systems

A. Galip ULSOY

期刊论文

Life cycle analysis and choice of natural gas-based automotive alternative fuels in Chongqing Municipality

WU Rui, LI Guangyi, ZHANG Zongyi, REN Yulong, HAN Weijian

期刊论文

升沉补偿装置虚拟样机协同设计及仿真分析

吕东,何将三,刘少军,黄锴

期刊论文

三峡船闸完建期156 m蓄水位4级运行方式原型调试研究

胡亚安,张瑞凯,李云

期刊论文

综论大坝原型反分析及其应用

顾冲时,吴中如

期刊论文

On the Innovation, Design, Construction, and Experiments of OMEGA-Based SSPS Prototype: The Sun Chasing

Baoyan Duan, Yiqun Zhang, Guangda Chen, Ze Zhao, Jianwei Mi, Xun Li, Lin Yang, Xi Li

期刊论文

Automotive revolution and carbon neutrality

期刊论文

Biological chip technology to quickly batch select optimum cryopreservation procedure

YU Lina, LIU Jing, ZHOU Yixin, HUA Zezhao

期刊论文

钛在汽车工业中的应用及降低钛材成本的工艺

杨遇春

期刊论文

新时代汽车强国战略研究综述（一）

钟志华,乔英俊,王建强,杨沿平,杨波,王东升,赵世佳,邓慧

期刊论文

A prototype online database-enabled design framework for wind analysis/design of low-rise buildings

Dae Kun KWON,Ahsan KAREEM,Deepak KUMAR,Yukio TAMURA

期刊论文

水下盾构法铁路隧道管片衬砌结构的原型加载试验研究

何川,封坤,晏启祥,齐春

期刊论文

Recycling polymeric waste from electronic and automotive sectors into value added products

Abhishek Kumar, Veena Choudhary, Rita Khanna, Romina Cayumil, Muhammad Ikram-ul-Haq, Veena Sahajwalla, Shiva Kumar I. Angadi, Ganapathy E. Paruthy, Partha S. Mukherjee, Miles Park

期刊论文