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Catalytic cracking of endothermic fuels in coated tube reactor

LI Jia, ZOU Jijun, ZHANG Xiangwen, GUO Wei, MI Zhentao

《化学科学与工程前沿（英文）》 2008年 第2卷 第2期   页码 181-185 doi: 10.1007/s11705-008-0032-1

摘要： Suspensoid of HZSM-5 or HY zeolites mixed with a self-made ceramic-like binder was coated on the inner wall of a tubular reactor by gas-aided fluid displacement technology. The coated zeolites were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The coating thickness is 10–20 ?m and the particle size of the zeolites is in the range of 1–5 ?m. In the coated reactor, cracking of endothermic fuels including -dodecane and aviation fuel RP-3 was carried out separately under supercritical conditions at 600°C and 625°C to investigate their heat sinks and conversion of catalytic reactions. For the reaction catalyzed by HY(25% mass fraction) coating, the heat sink capacity of -dodecane are 815.7 and 901.9 kJ/kg higher than that of the bare tube at 600°C and at 625°C, respectively. Conversion of -dodecane also increases from 42% to 60% at 600°C and from 66% to 80% at 625°C. The coated zeolite can significantly inhibit the carbon deposition during supercritical cracking reactions.

关键词： HZSM-5     self-made ceramic-like     gas-aided     Conversion     Suspensoid    

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Review of research and development of computer-aided Kansei Engineering

Li LIN, Chengqi XUE

《机械工程前沿（英文）》 2009年 第4卷 第2期   页码 125-128 doi: 10.1007/s11465-009-0023-z

摘要： Kansei Engineering is an important research approach and has become the hotspot of research in design fields. The concept of Kansei Engineering is introduced based on the investigation of related literatures. The working process and the key technology of computer-aided Kansei Engineering systems are discussed. Finally, the development trend of Kansei Engineering is outlined according to the development of computer and networking technology.

关键词： Kansei words     design elements     system     database    

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Design of bio-oil additives via molecular signature descriptors using a multi-stage computer-aided molecular

《化学科学与工程前沿（英文）》 2022年 第16卷 第2期   页码 168-182 doi: 10.1007/s11705-021-2056-8

摘要： Direct application of bio-oil from fast pyrolysis as a fuel has remained a challenge due to its undesirable attributes such as low heating value, high viscosity, high corrosiveness and storage instability. Solvent addition is a simple method for circumventing these disadvantages to allow further processing and storage. In this work, computer-aided molecular design tools were developed to design optimal solvents to upgrade bio-oil whilst having low environmental impact. Firstly, target solvent requirements were translated into measurable physical properties. As different property prediction models consist different levels of structural information, molecular signature descriptor was used as a common platform to formulate the design problem. Because of the differences in the required structural information of different property prediction models, signatures of different heights were needed in formulating the design problem. Due to the combinatorial nature of higher-order signatures, the complexity of a computer-aided molecular design problem increases with the height of signatures. Thus, a multi-stage framework was developed by developing consistency rules that restrict the number of higher-order signatures. Finally, phase stability analysis was conducted to evaluate the stability of the solvent-oil blend. As a result, optimal solvents that improve the solvent-oil blend properties while displaying low environmental impact were identified.

关键词： computer-aided molecular design     bio-oil additives     molecular signature descriptor    

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从计算机辅助设计到人辅助设计——一种等几何拓扑优化方法

王英俊, 肖蜜, 夏兆辉, 李培根, 高亮

《工程（英文）》 2023年 第22卷 第3期   页码 94-105 doi: 10.1016/j.eng.2022.07.013

摘要：

本文提出了一种新的设计模式——人辅助设计，以取代传统的计算机辅助设计。在人辅助设计中，计算机可以通过一种新的等几何拓扑优化自动完成整个产品设计，而人类仅需协助轻微修改设计以满足要求。文中提出了一种嵌入域等几何拓扑优化用于设计具有不规则设计域的复杂模型，并且可以基于分层等几何拓扑优化结果自动生成优化结果的可编辑几何模型。测试了三个算例以验证所提出的等几何拓扑优化模式，包括一个具有规则设计域的3D悬臂梁，一个具有不规则设计域的汽车零件和一个具有多尺度结构的MBB梁。结果表明，所提出的等几何拓扑优化模式可以自动生成高质量的优化模型。因此，该技术具有成为革命性技术的巨大潜力，可以将当前设计模式由计算机辅助设计转变为人辅助设计。

关键词： 人辅助设计     CAD/CAE一体化     等几何分析     结构优化     等几何拓扑优化    

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Dimethicone-aided laser cutting of solar rolled glass

Wenyuan LI, Guojun ZHANG, Long CHEN, Yu HUANG, Youmin RONG, Zhangrui GAO

《机械工程前沿（英文）》 2021年 第16卷 第1期   页码 111-121 doi: 10.1007/s11465-020-0615-1

摘要： Solar rolled glass, with one micro-structure surface and another roughness surface, can cause diffuse refraction of the focused laser spot, and this phenomenon restricts the application of laser manufacturing. In this study, laser cutting of solar rolled glass with a thickness of 2.5 mm was successfully achieved with the help of dimethicone to ensure laser focusing. Dimethicone was coated on the top surface of the rolled glass processing zone, and a bottom–up multilayer increment with the spiral line was applied to control the cutting path. Different viscosity values of dimethicone were considered. Results showed that surface quality increased as the viscosity increased until a certain threshold was reached; afterward, the surface quality decreased or directly caused the cutting to fail. The minimum surface roughness (3.26 µm) of the processed surface (chipping: Width≤113.64 µm, area 215199 µm ) was obtained when the dimethicone viscosity and laser pulse frequency were 1000 mm /s and 43 kHz (power 25.4 W), respectively. The micro-defects on the processed surface were few, and the edge chipping width and depth of the laser processed surface were small.

关键词： laser cutting     solar rolled glass     dimethicone     viscosity     surface quality    

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Computer aided process planning system based on workflow technology and integrated bill of material tree

LU Chun-guang, MENG Li-li

《机械工程前沿（英文）》 2006年 第1卷 第3期   页码 305-312 doi: 10.1007/s11465-006-0039-6

摘要： It is extremely important for procedure of process design and management of process data for product life cycle in Computer Aided Process Planning (CAPP) system, but there are many shortcomings with traditional CAPP system in these respects. To solve these questions, application of workflow technology in CAPP system based on web-integrated Bill of Material (BOM) tree is discussed, and a concept of integrated BOM tree was brought forward. Taking integrated BOM as the thread, CAPP systematic technological process is analyzed. The function, system architecture, and implementation mechanism of CAPP system based on Browser/Server and Customer/Server model are expatiated. Based on it, the key technologies of workflow management device were analyzed. Eventually, the implementation mechanism of integrated BOM tree was analyzed from viewpoints of material information encoding, organization node design of integrated BOM tree, transformation from Engineering BOM (EBOM) to Process BOM(PBOM), and the programming implementation technology.

关键词： PBOM     systematic technological     implementation technology     management     workflow technology    

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Computer-Aided Design System for CP Single-Screw Compressor

SHEN Jing-feng, YAO Fu-sheng

《机械工程前沿（英文）》 2006年 第1卷 第1期   页码 21-25 doi: 10.1007/s11465-005-0018-3

摘要：

To design various optimum parameters and simulate the working process of CP single-screw compressor, the Computer-Aided Design (CAD) system for the CP single-screw compressor has been established. A new method based on computer graphics technology, database technology, object-oriented programming technology, and visual simulation technology has been adopted in this CAD system. The system has integrated solid modeling function with parameterization design function and animator simulation function based on analyzing the working principle of the CP single-screw compressor. The experimental results show that the CAD system for the CP single-screw compressor is practical and feasible.

关键词： CP single-screw     database technology     simulation technology     programming technology     animator simulation    

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Review of materials used in laser-aided additive manufacturing processes to produce metallic products

Xiaodong NIU, Surinder SINGH, Akhil GARG, Harpreet SINGH, Biranchi PANDA, Xiongbin PENG, Qiujuan ZHANG

《机械工程前沿（英文）》 2019年 第14卷 第3期   页码 282-298 doi: 10.1007/s11465-019-0526-1

摘要： Rapid prototyping (RP) or layered manufacturing (LM) technologies have been extensively used to manufacture prototypes composed mainly of plastics, polymers, paper, and wax due to the short product development time and low costs of these technologies. However, such technologies, with the exception of selective laser melting and sintering, are not used to fabricate metallic products because of the resulting poor life, short cycle, poor surface finish, and low structural integrity of the fabricated parts. The properties endowed by these parts do not match those of functional parts. Therefore, extensive research has been conducted to develop new additive manufacturing (AM) technologies by extending existing RP technologies. Several AM technologies have been developed for the fabrication of metallic objects. These technologies utilize materials, such as Ni-, Al-, and Ti-based alloys and stainless steel powders, to fabricate high-quality functional components. The present work reviews the type of materials used in laser-based AM processes for the manufacture of metallic products. The advantages and disadvantages of processes and different materials are summarized, and future research directions are discussed in the final section. This review can help experts select the ideal type of process or technology for the manufacturing of elements composed of a given alloy or material (Ni, Ti, Al, Pb, and stainless steel).

关键词： direct metal deposition     laser-based manufacturing     rapid manufacturing     selective laser melting     additive manufacturing    

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Selecting and prioritizing key factors for CAD/CAM software in small- and medium-sized enterprises using AHP

Ghulam ZAKRIA, Zailin GUAN, Yasser RIAZ, Mirza JAHANZAIB, Anwar KHAN,

《机械工程前沿（英文）》 2010年 第5卷 第2期   页码 157-164 doi: 10.1007/s11465-010-0017-x

摘要： In today’s fast-paced world, computer-aided design/computer-aided manufacturing (CAD/CAM) systems have become a necessary element in manufacturing industries. Prior to investment in a CAD/CAM system, it is essential for investor to know how to maximize their benefits from buying a new or by changing an existing CAD/CAM system. The purpose of this study is to provide a methodology to assist small- and medium-sized manufacturing companies of Pakistan in selecting a CAD/CAM system. It will also facilitate the software providers in recognizing the current state of affairs as well as preceding problems regarding the application of CAD/CAM in manufacturing firms when assisting them in choosing the direction for future development simultaneously. To accomplish this purpose, data have been collected about current CAD/CAM systems. Important criteria for system selection and parameters for evaluation have also been identified and prioritized. Analytic hierarchy process (AHP) is used as a decision-making technique for identifying and prioritizing important factors for CAD/CAM software selection. Expert Choice (AHP-based software) has been used to validate the results.

关键词： computer-aided design (CAD)     computer-aided manufacturing(CAM)     SMEs     analytical hierarchal approach     Expert Choice    

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Secure analysis on artificial-noise-aided simultaneous wireless information and power transfer systems

Wei-min Hou, Qing-shan Tang,cstqs001@126.com

《信息与电子工程前沿（英文）》 2020年 第21卷 第11期   页码 1535-1670 doi: 10.1631/FITEE.2000083

摘要： In this paper, we investigate the secrecy outage performance in (SWIPT) systems taking assistance into account. Multiple antennas in the source and a single antenna in both the legitimate receiver and the eavesdropper are assumed. Specifically, the transmitted signal at the source is composed of two parts, where the first part is the information symbols and the other is the noise for the eavesdropper. To avoid making noise in the legitimate receiver, these two parts in the transmitted signals are modulated into two orthogonal dimensions according to the instantaneous channel state between the source and the legitimate receiver. We derive an approximate closed-form expression for the (SOP) by adopting the Gauss-Laguerre quadrature (GLQ) method, where the gap between the exact SOP and our approximate SOP converges with increase of the summation terms in the GLQ. To obtain the secrecy diversity order and secrecy array gain for the considered SWIPT system, the asymptotic result of the SOP is also derived. This is tight in the high signal-to-noise ratio region. A novel and robust SOP approximation is also analyzed given a small variance of the signal-to-interference-plus-noise ratio at the eavesdropper. Some selected Monte-Carlo numerical results are presented to validate the correctness of the derived closed-form expressions.

关键词： 人工噪声；多天线系统；保密中断概率；无线携能    

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基于图像测量技术的高速铁路有砟道床道砟颗粒运动分析 Article

边学成, 蔡文清, 罗政, 赵闯, 陈云敏​​​​​​​

《工程（英文）》 2023年 第27卷 第8期   页码 161-177 doi: 10.1016/j.eng.2022.08.006

摘要：

有砟轨道是国内外高速铁路主要轨道形式之一，由级配碎石组成的道砟层在高速列车荷载下会产生比普通铁路更明显的道砟颗粒运动，易于引发过大的道床沉降，对列车安全运行产生不利影响。但由于缺乏有效测量手段和分析方法，道砟颗粒的运动行为研究仍不多见。本课题基于数码相机和图形识别方法，在全比尺模型试验中开发了道砟颗粒运动追踪技术，将1274个道床层表层道砟染色并设定为追踪目标；在试验中以垂直向下的角度陆续拍摄道砟层照片，通过追踪目标显示的像素变化特征，对表层道砟颗粒运动进行追踪，定量地分析了不同列车速度和轴重工况下道砟颗粒的运动行为。试验结果表明：表层道砟颗粒运动在低速列车荷载作用下较微弱且主要集中于轨枕附近，但当列车时速提升至360 km时，道砟运动明显加剧并扩展至整个道床层；此外，经统计发现道砟颗粒位移和旋转的发展规律类似；轨道振动会诱发道砟颗粒运动，竖向加速度和水平加速度分别是轨道中心和轨道边缘附近道砟颗粒运动产生的主要原因。道砟颗粒运动和轨道沉降在长期加载中的发展趋势相似，两者同时达到稳定状态；轨道服役性能（如振动特性、累积沉降与轨枕支承刚度）在高速列车荷载的长期作用下会部分劣化，其与道砟颗粒流动的方向和分布密切相关。

关键词： 高速铁路     全比尺模型试验     图像测量技术     道砟颗粒运动     轨道振动     累积沉降    

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Low-Cost Federated Broad Learning for Privacy-Preserved Knowledge Sharing in the RIS-Aided Internet of

Xiaoming Yuan,Jiahui Chen,Ning Zhang,Qiang Ye,Changle Li,Chunsheng Zhu,Xuemin Sherman Shen,

《工程（英文）》 doi: 10.1016/j.eng.2023.04.015

摘要： High-efficiency and low-cost knowledge sharing can improve the decision-making ability of autonomous vehicles by mining knowledge from the Internet of Vehicles (IoVs). However, it is challenging to ensure high efficiency of local data learning models while preventing privacy leakage in a high mobility environment. In order to protect data privacy and improve data learning efficiency in knowledge sharing, we propose an asynchronous federated broad learning (FBL) framework that integrates broad learning (BL) into federated learning (FL). In FBL, we design a broad fully connected model (BFCM) as a local model for training client data. To enhance the wireless channel quality for knowledge sharing and reduce the communication and computation cost of participating clients, we construct a joint resource allocation and reconfigurable intelligent surface (RIS) configuration optimization framework for FBL. The problem is decoupled into two convex subproblems. Aiming to improve the resource scheduling efficiency in FBL, a double Davidon–Fletcher–Powell (DDFP) algorithm is presented to solve the time slot allocation and RIS configuration problem. Based on the results of resource scheduling, we design a reward-allocation algorithm based on federated incentive learning (FIL) in FBL to compensate clients for their costs. The simulation results show that the proposed FBL framework achieves better performance than the comparison models in terms of efficiency, accuracy, and cost for knowledge sharing in the IoV.

关键词： Knowledge sharing     Internet of Vehicles     Federated learning     Broad learning     Reconfigurable intelligent surfaces     Resource allocation    

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基于对称多项式辅助的中国余数定理的脉冲多普勒雷达多目标距离估计算法 Research Articles

曹成虎1,赵永波1,2

《信息与电子工程前沿（英文）》 2022年 第23卷 第2期   页码 304-316 doi: 10.1631/FITEE.2000418

摘要： 工作在高脉冲重复频率的脉冲多普勒雷达能避免多普勒模糊，但是高脉冲重复频率在许多场合导致距离模糊。目前，解决距离模糊的有效方案是基于波形设计，但是增加了雷达系统的复杂性。由于目标距离和量测距离的对应关系未知，传统的基于多脉冲重复频率方案，特别是中国余数定理，很难应用于多目标距离解模糊。本文旨在研究量测距离含有误差的基于中国余数定理多目标距离估计方法。提出基于对称多项式辅助的中国余数定理，能有效从含有误差的量测距离中重建多目标距离。封闭式鲁棒中国余数定理和基于Aitken加速算法的多项式方程求解方法能有效降低所提算法的计算复杂度。

关键词： 距离模糊；误差距离；多目标；对称多项式辅助的中国余数定理    

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CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage

《能源前沿（英文）》 2023年 第17卷 第3期   页码 428-445 doi: 10.1007/s11708-023-0865-9

摘要： In this work, using fractured shale cores, isothermal adsorption experiments and core flooding tests were conducted to investigate the performance of injecting different gases to enhance shale gas recovery and CO2 geological storage efficiency under real reservoir conditions. The adsorption process of shale to different gases was in agreement with the extended-Langmuir model, and the adsorption capacity of CO2 was the largest, followed by CH4, and that of N2 was the smallest of the three pure gases. In addition, when the CO2 concentration in the mixed gas exceeded 50%, the adsorption capacity of the mixed gas was greater than that of CH4, and had a strong competitive adsorption effect. For the core flooding tests, pure gas injection showed that the breakthrough time of CO2 was longer than that of N2, and the CH4 recovery factor at the breakthrough time (RCH4) was also higher than that of N2. The RCH4 of CO2 gas injection was approximately 44.09%, while the RCH4 of N2 was only 31.63%. For CO2/N2 mixed gas injection, with the increase of CO2 concentration, the RCH4 increased, and the RCH4 for mixed gas CO2/N2 = 8:2 was close to that of pure CO2, about 40.24%. Moreover, the breakthrough time of N2 in mixed gas was not much different from that when pure N2 was injected, while the breakthrough time of CO2 was prolonged, which indicated that with the increase of N2 concentration in the mixed gas, the breakthrough time of CO2 could be extended. Furthermore, an abnormal surge of N2 concentration in the produced gas was observed after N2 breakthrough. In regards to CO2 storage efficiency (Sstorage-CO2), as the CO2 concentration increased, Sstorage-CO2 also increased. The Sstorage-CO2 of the pure CO2 gas injection was about 35.96%, while for mixed gas CO2/N2 = 8:2, Sstorage-CO2 was about 32.28%.

关键词： shale gas     gas injection     competitive adsorption     enhanced shale gas recovery     CO2 geological storage    

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A novel methodology for forecasting gas supply reliability of natural gas pipeline systems

Feng CHEN, Changchun WU

《能源前沿（英文）》 2020年 第14卷 第2期   页码 213-223 doi: 10.1007/s11708-020-0672-5

摘要： In this paper, a novel systematic and integrated methodology to assess gas supply reliability is proposed based on the Monte Carlo method, statistical analysis, mathematical-probabilistic analysis, and hydraulic simulation. The method proposed has two stages. In the first stage, typical scenarios are determined. In the second stage, hydraulic simulation is conducted to calculate the flow rate in each typical scenario. The result of the gas pipeline system calculated is the average gas supply reliability in each typical scenario. To verify the feasibility, the method proposed is applied for a real natural gas pipelines network system. The comparison of the results calculated and the actual gas supply reliability based on the filed data in the evaluation period suggests the assessment results of the method proposed agree well with the filed data. Besides, the effect of different components on gas supply reliability is investigated, and the most critical component is identified. For example, the 48th unit is the most critical component for the SH terminal station, while the 119th typical scenario results in the most severe consequence which causes the loss of 175.61×10 m gas when the 119th scenario happens. This paper provides a set of scientific and reasonable gas supply reliability indexes which can evaluate the gas supply reliability from two dimensions of quantity and time.

关键词： natural gas pipeline system     gas supply reliability     evaluation index     Monte Carlo method     hydraulic simulation    

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标题 作者 时间 类型 操作

Catalytic cracking of endothermic fuels in coated tube reactor

LI Jia, ZOU Jijun, ZHANG Xiangwen, GUO Wei, MI Zhentao

期刊论文

Review of research and development of computer-aided Kansei Engineering

Li LIN, Chengqi XUE

期刊论文

Design of bio-oil additives via molecular signature descriptors using a multi-stage computer-aided molecular

期刊论文

从计算机辅助设计到人辅助设计——一种等几何拓扑优化方法

王英俊, 肖蜜, 夏兆辉, 李培根, 高亮

期刊论文

Dimethicone-aided laser cutting of solar rolled glass

Wenyuan LI, Guojun ZHANG, Long CHEN, Yu HUANG, Youmin RONG, Zhangrui GAO

期刊论文

Computer aided process planning system based on workflow technology and integrated bill of material tree

LU Chun-guang, MENG Li-li

期刊论文

Computer-Aided Design System for CP Single-Screw Compressor

SHEN Jing-feng, YAO Fu-sheng

期刊论文

Review of materials used in laser-aided additive manufacturing processes to produce metallic products

Xiaodong NIU, Surinder SINGH, Akhil GARG, Harpreet SINGH, Biranchi PANDA, Xiongbin PENG, Qiujuan ZHANG

期刊论文

Selecting and prioritizing key factors for CAD/CAM software in small- and medium-sized enterprises using AHP

Ghulam ZAKRIA, Zailin GUAN, Yasser RIAZ, Mirza JAHANZAIB, Anwar KHAN,

期刊论文

Secure analysis on artificial-noise-aided simultaneous wireless information and power transfer systems

Wei-min Hou, Qing-shan Tang,cstqs001@126.com

期刊论文

基于图像测量技术的高速铁路有砟道床道砟颗粒运动分析

边学成, 蔡文清, 罗政, 赵闯, 陈云敏​​​​​​​

期刊论文

Low-Cost Federated Broad Learning for Privacy-Preserved Knowledge Sharing in the RIS-Aided Internet of

Xiaoming Yuan,Jiahui Chen,Ning Zhang,Qiang Ye,Changle Li,Chunsheng Zhu,Xuemin Sherman Shen,

期刊论文

基于对称多项式辅助的中国余数定理的脉冲多普勒雷达多目标距离估计算法

曹成虎1,赵永波1,2

期刊论文

CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage

期刊论文

A novel methodology for forecasting gas supply reliability of natural gas pipeline systems

Feng CHEN, Changchun WU

期刊论文