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Magnetic confinement fusion: a brief review

Chuanjun HUANG, Laifeng LI

《能源前沿(英文)》 2018年 第12卷 第2期   页码 305-313 doi: 10.1007/s11708-018-0539-1

摘要: Fusion energy is considered to be the ultimate energy source, which does not contribute to climate change compared with conventional fossil fuel. It is massive compared with unconventional renewable energy and demonstrates fewer safety features compared with unconventional fission energy. During the past several decades, never-ceasing efforts have been made to peacefully utilize the fusion energy in various approaches, especially inertial confinement and magnetic confinement. In this paper, the main developments of magnetic confinement fusion with emphasis on confinement systems as well as challenges of materials related to superconducting magnet and plasma-facing components are reviewed. The scientific feasibility of magnetic confinement fusion has been demonstrated in JET, TFTR, JT-60, and EAST, which instigates the construction of the International Thermonuclear Experimental Reactor (ITER). A fusion roadmap to DEMO and commercial fusion power plant has been established and steady progresses have been made to achieve the ultimate energy source.

关键词: fusion energy     magnetic confinement     tokamak     structural material     superconducting magnet    

Iterative HOEO fusion strategy: a promising tool for enhancing bearing fault feature

《机械工程前沿(英文)》 2023年 第18卷 第1期 doi: 10.1007/s11465-022-0725-z

摘要: As parameter independent yet simple techniques, the energy operator (EO) and its variants have received considerable attention in the field of bearing fault feature detection. However, the performances of these improved EO techniques are subjected to the limited number of EOs, and they cannot reflect the non-linearity of the machinery dynamic systems and affect the noise reduction. As a result, the fault-related transients strengthened by these improved EO techniques are still subject to contamination of strong noises. To address these issues, this paper presents a novel EO fusion strategy for enhancing the bearing fault feature nonlinearly and effectively. Specifically, the proposed strategy is conducted through the following three steps. First, a multi-dimensional information matrix (MDIM) is constructed by performing the higher order energy operator (HOEO) on the analysis signal iteratively. MDIM is regarded as the fusion source of the proposed strategy with the properties of improving the signal-to-interference ratio and suppressing the noise in the low-frequency region. Second, an enhanced manifold learning algorithm is performed on the normalized MDIM to extract the intrinsic manifolds correlated with the fault-related impulses. Third, the intrinsic manifolds are weighted to recover the fault-related transients. Simulation studies and experimental verifications confirm that the proposed strategy is more effective for enhancing the bearing fault feature than the existing methods, including HOEOs, the weighting HOEO fusion, the fast Kurtogram, and the empirical mode decomposition.

关键词: higher order energy operator     fault diagnosis     manifold learning     rolling element bearing     information fusion    

快Z-箍缩——有前景的聚变能源新途径

彭先觉,华欣生

《中国工程科学》 2008年 第10卷 第1期   页码 47-53

摘要:

简要介绍了快Z-箍缩的基本概念;综述了快Z-箍缩等离子体研究及其作为高能密度物理与惯性约束聚变(ICF),尤其作为低成本聚变能源研究的最新进展;探讨了快Z-箍缩驱动ICF作为聚变能源可能遇到的技术问题及应用前景。

关键词: 快Z-箍缩内爆     高能密度物理     惯性约束聚变     聚变能源    

互联网与能源系统的融合形态与技术

张勇军,李立浧,陈泽兴,徐敏,刘平,蔡泽祥,韩永霞,许爱东

《中国工程科学》 2018年 第20卷 第2期   页码 79-85 doi: 10.15302/J-SSCAE-2018.02.012

摘要:

基于互联网技术和互联网思维推进能源系统与信息网络的深度融合,构建多种能源优化互补、供需互动开放共享的能源系统和生态体系,是能源系统发展的新趋势。本文基于互联网技术发展的背景,阐述了互联网与能源系统融合的驱动力,探究了互联网与能源系统融合的基本形态,提出了互联网与能源系统融合的分阶段发展形态,即智能化、透明化、智慧化;最后,提出了互联网与能源系统融合的相关关键技术。

关键词: 互联网思维     互联网技术     能源系统     融合    

聚变-裂变能源混合堆可行性及在我国核能发展中作用的分析

刘成安,师学明

《中国工程科学》 2011年 第13卷 第3期   页码 24-28

摘要:

简要论述了核能在我国能源发展战略中的地位及聚变-裂变混合堆在核能持续发展中的重要作用。对以不久将来即可实现的ITER聚变装置作驱动堆芯、天然铀水冷裂变系统作包层的混合堆做了细致的分析。这种混合堆型可以实现GWe级净电功率输出,年造钚1 656 kg,支持2.68个同功率压水堆电站对易裂变燃料的需要。初步的经济评估说明,混合堆电的成本是同功率压水堆电成本的1.67倍;而在不计燃料成本的情况下,混合堆与压水堆组合系统电的成本是同功率压水堆电成本的1.18倍。考虑到一般压水堆需消耗大量的天然铀,加上铀浓缩成本,混合堆与压水堆组合系统电的成本,与压水堆电的成本是可以相比拟的。

关键词: 混合堆     聚变堆芯     裂变包层     易裂变核     可转换核    

Turbidity-adaptive underwater image enhancement method using image fusion

《机械工程前沿(英文)》 2022年 第17卷 第3期 doi: 10.1007/s11465-021-0669-8

摘要: Clear, correct imaging is a prerequisite for underwater operations. In real freshwater environment including rivers and lakes, the water bodies are usually turbid and dynamic, which brings extra troubles to quality of imaging due to color deviation and suspended particulate. Most of the existing underwater imaging methods focus on relatively clear underwater environment, it is uncertain that if those methods can work well in turbid and dynamic underwater environments. In this paper, we propose a turbidity-adaptive underwater image enhancement method. To deal with attenuation and scattering of varying degree, the turbidity is detected by the histogram of images. Based on the detection result, different image enhancement strategies are designed to deal with the problem of color deviation and blurring. The proposed method is verified by an underwater image dataset captured in real underwater environment. The result is evaluated by image metrics including structure similarity index measure, underwater color image quality evaluation metric, and speeded-up robust features. Test results exhibit that the method can correct the color deviation and improve the quality of underwater images.

关键词: turbidity     underwater image enhancement     image fusion     underwater robots     visibility    

M-LFM: a multi-level fusion modeling method for shape−performance integrated digital twin of complex

《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0708-0

摘要: As a virtual representation of a specific physical asset, the digital twin has great potential for realizing the life cycle maintenance management of a dynamic system. Nevertheless, the dynamic stress concentration is generated since the state of the dynamic system changes over time. This generation of dynamic stress concentration has hindered the exploitation of the digital twin to reflect the dynamic behaviors of systems in practical engineering applications. In this context, this paper is interested in achieving real-time performance prediction of dynamic systems by developing a new digital twin framework that includes simulation data, measuring data, multi-level fusion modeling (M-LFM), visualization techniques, and fatigue analysis. To leverage its capacity, the M-LFM method combines the advantages of different surrogate models and integrates simulation and measured data, which can improve the prediction accuracy of dynamic stress concentration. A telescopic boom crane is used as an example to verify the proposed framework for stress prediction and fatigue analysis of the complex dynamic system. The results show that the M-LFM method has better performance in the computational efficiency and calculation accuracy of the stress prediction compared with the polynomial response surface method and the kriging method. In other words, the proposed framework can leverage the advantages of digital twins in a dynamic system: damage monitoring, safety assessment, and other aspects and then promote the development of digital twins in industrial fields.

关键词: shape−performance integrated digital twin (SPI-DT)     multi-level fusion modeling (M-LFM)     surrogate model     telescopic boom crane     data fusion    

Gradient-based compressive image fusion

Yang CHEN,Zheng QIN

《信息与电子工程前沿(英文)》 2015年 第16卷 第3期   页码 227-237 doi: 10.1631/FITEE.1400217

摘要: We present a novel image fusion scheme based on gradient and scrambled block Hadamard ensemble (SBHE) sampling for compressive sensing imaging. First, source images are compressed by compressive sensing, to facilitate the transmission of the sensor. In the fusion phase, the image gradient is calculated to reflect the abundance of its contour information. By compositing the gradient of each image, gradient-based weights are obtained, with which compressive sensing coefficients are achieved. Finally, inverse transformation is applied to the coefficients derived from fusion, and the fused image is obtained. Information entropy (IE), Xydeas’s and Piella’s metrics are applied as non-reference objective metrics to evaluate the fusion quality in line with different fusion schemes. In addition, different image fusion application scenarios are applied to explore the scenario adaptability of the proposed scheme. Simulation results demonstrate that the gradient-based scheme has the best performance, in terms of both subjective judgment and objective metrics. Furthermore, the gradient-based fusion scheme proposed in this paper can be applied in different fusion scenarios.

关键词: Compressive sensing (CS)     Image fusion     Gradient-based image fusion     CS-based image fusion    

Information fusion in aquaculture: a state-of the art review

Shahbaz Gul HASSAN,Murtaza HASAN,Daoliang LI

《农业科学与工程前沿(英文)》 2016年 第3卷 第3期   页码 206-221 doi: 10.15302/J-FASE-2016111

摘要: Efficient fish feeding is currently one of biggest challenges in aquaculture to enhance the production of fish quality and quantity. In this review, an information fusion approach was used to integrate multi-sensor and computer vision techniques to make fish feeding more efficient and accurate. Information fusion is a well-known technology that has been used in different fields of artificial intelligence, robotics, image processing, computer vision, sensors and wireless sensor networks. Information fusion in aquaculture is a growing field of research that is used to enhance the performance of an “industrialized” ecosystem. This review study surveys different fish feeding systems using multi-sensor data fusion, computer vision technology, and different food intake models. In addition, different fish behavior monitoring techniques are discussed, and the parameters of water, pH, dissolved oxygen, turbidity, temperature etc., necessary for the fish feeding process, are examined. Moreover, the different waste management and fish disease diagnosis techniques using different technologies, expert systems and modeling are also reviewed.

关键词: aquaculture     computer vision     information fusion     modeling     sensor    

Contact detection with multi-information fusion for quadruped robot locomotion under unstructured terrain

《机械工程前沿(英文)》 2023年 第18卷 第3期 doi: 10.1007/s11465-023-0760-4

摘要: Reliable foot-to-ground contact state detection is crucial for the locomotion control of quadruped robots in unstructured environments. To improve the reliability and accuracy of contact detection for quadruped robots, a detection approach based on the probabilistic contact model with multi-information fusion is presented to detect the actual contact states of robotic feet with the ground. Moreover, a relevant control strategy to address unexpected early and delayed contacts is planned. The approach combines the internal state information of the robot with the measurements from external sensors mounted on the legs and feet of the prototype. The overall contact states are obtained by the classification of the model-based predicted probabilities. The control strategy for unexpected foot-to-ground contacts can correct the control actions of each leg of the robot to traverse cluttered environments by changing the contact state. The probabilistic model parameters are determined by testing on the single-leg experimental platform. The experiments are conducted on the experimental prototype, and results validate the contact detection and control strategy for unexpected contacts in unstructured terrains during walking and trotting. Compared with the body orientation under the time-based control method regardless of terrain, the root mean square errors of roll, pitch, and yaw respectively decreased by 60.07%, 54.73%, and 64.50% during walking and 73.40%, 61.49%, and 61.48% during trotting.

关键词: multi-information fusion     contact detection     quadruped robot     probabilistic contact model     unstructured terrain    

Analysis of spinal lumbar interbody fusion cage subsidence using Taguchi method, finite element analysis

Christopher John NASSAU, N. Scott LITOFSKY, Yuyi LIN

《机械工程前沿(英文)》 2012年 第7卷 第3期   页码 247-255 doi: 10.1007/s11465-012-0335-2

摘要:

Subsidence, when implant penetration induces failure of the vertebral body, occurs commonly after spinal reconstruction. Anterior lumbar interbody fusion (ALIF) cages may subside into the vertebral body and lead to kyphotic deformity. No previous studies have utilized an artificial neural network (ANN) for the design of a spinal interbody fusion cage. In this study, the neural network was applied after initiation from a Taguchi L18 orthogonal design array. Three-dimensional finite element analysis (FEA) was performed to address the resistance to subsidence based on the design changes of the material and cage contact region, including design of the ridges and size of the graft area. The calculated subsidence is derived from the ANN objective function which is defined as the resulting maximum von Mises stress (VMS) on the surface of a simulated bone body after axial compressive loading. The ANN was found to have minimized the bone surface VMS, thereby optimizing the ALIF cage given the design space. Therefore, the Taguchi-FEA-ANN approach can serve as an effective procedure for designing a spinal fusion cage and improving the biomechanical properties.

关键词: anterior lumbar interbody fusion (ALIF)     artificial neural network (ANN)     finite element     interbody cage     lumbar interbody fusion     subsidence     taguchi method    

ARC welding method for bonding steel with aluminum

Zhenyang LU, Pengfei HUANG, Wenning GAO, Yan LI, Hanpeng ZHANG, Shuyan YIN

《机械工程前沿(英文)》 2009年 第4卷 第2期   页码 134-146 doi: 10.1007/s11465-009-0033-x

摘要: When welding steel with aluminum, the appearance of intermetallic compounds of Fe and Al will decrease tenacity and increase rigidity, which leads to bad joint performance. A new type of low energy input (LEI) welding technology is introduced which can be used to weld steel with aluminum. Using the technology, brazing was located on the steel side and arc fusion welding on the aluminum side. The less heat input reduces the thickness of intermetallic compounds to 3-4 μm. Tensile strength tests prove that the joint breaks at the heat-affected zone and the strength is higher than 70% of the aluminum’s. Thus, the method can lead to a good performance joint.

关键词: joining of steel and aluminum     low energy input welding     arc welding     fusion welding – brazing    

核爆聚变电站──人类未来能源的希望

彭先觉,刘成安,陈银亮,郭 勤,尹文华,白云,陈小伟,屈明

《中国工程科学》 2008年 第10卷 第1期   页码 39-46

摘要:

详细介绍了核爆聚变电站的基本概念、组成、发展简史;提出了解决核爆炸实施安全、烧氘型核装置设计、核燃料生产回收等一系列问题的技术途径;对电站的技术可行性进行了分析论证,并比较了各种作为人类未来能源核能方案的前景。

关键词: 核爆聚变电站     爆洞     喷钠     烧氘型核装置     核燃料循环    

Development and testing of a wireless smart toolholder with multi-sensor fusion

《机械工程前沿(英文)》 2023年 第18卷 第4期 doi: 10.1007/s11465-023-0774-y

摘要: The smart toolholder is the core component in the development of intelligent and precise manufacturing. It enables in situ monitoring of cutting data and machining accuracy evolution and has become a focal point in academic research and industrial applications. However, current table and rotational dynamometers for milling force, vibration, and temperature testing suffer from cumbersome installation and provide only a single acquisition signal, which limits their use in laboratory settings. In this study, we propose a wireless smart toolholder with multi-sensor fusion for simultaneous sensing of milling force, vibration, and temperature signals. We select force, vibration, and temperature sensors suitable for smart toolholder fusion to adapt to the cutting environment. Thereafter, structural design, circular runout, dynamic balancing, static stiffness, and dynamic inherent frequency tests are conducted to assess its dynamic and static performance. Finally, the smart toolholder is tested for accuracy and repeatability in terms of force, vibration, and temperature. Experimental results demonstrate that the smart toolholder accurately captures machining data with a relative deviation of less than 1.5% compared with existing force gauges and provides high repeatability of milling temperature and vibration signals. Therefore, it is a smart solution for machining condition monitoring.

关键词: wireless smart toolholder     multi-sensor fusion     circular runout     dynamic balancing     static stiffness     dynamic inherent frequency    

一种基于粗糙集的模糊信息融合方法及应用

陈双叶,张微敬

《中国工程科学》 2006年 第8卷 第12期   页码 75-79

摘要:

将粗糙集理论和模糊逻辑技术结合起来,提出了一种基于粗糙集数据处理的模糊信息融合方法。运用粗糙集的基本理论和简约计算方法,从大量原始数据中发现精简的、概略化的规则,结合模糊逻辑推理建立一致粗糙模糊模型,并提出了对模型进行扩充与完备化的概念。脉动真空灭菌温度控制过程的仿真试验研究结果表明了所提方法的有效性和可行性。

关键词: 信息融合     粗糙集     模糊逻辑     粗糙模糊模型    

标题 作者 时间 类型 操作

Magnetic confinement fusion: a brief review

Chuanjun HUANG, Laifeng LI

期刊论文

Iterative HOEO fusion strategy: a promising tool for enhancing bearing fault feature

期刊论文

快Z-箍缩——有前景的聚变能源新途径

彭先觉,华欣生

期刊论文

互联网与能源系统的融合形态与技术

张勇军,李立浧,陈泽兴,徐敏,刘平,蔡泽祥,韩永霞,许爱东

期刊论文

聚变-裂变能源混合堆可行性及在我国核能发展中作用的分析

刘成安,师学明

期刊论文

Turbidity-adaptive underwater image enhancement method using image fusion

期刊论文

M-LFM: a multi-level fusion modeling method for shape−performance integrated digital twin of complex

期刊论文

Gradient-based compressive image fusion

Yang CHEN,Zheng QIN

期刊论文

Information fusion in aquaculture: a state-of the art review

Shahbaz Gul HASSAN,Murtaza HASAN,Daoliang LI

期刊论文

Contact detection with multi-information fusion for quadruped robot locomotion under unstructured terrain

期刊论文

Analysis of spinal lumbar interbody fusion cage subsidence using Taguchi method, finite element analysis

Christopher John NASSAU, N. Scott LITOFSKY, Yuyi LIN

期刊论文

ARC welding method for bonding steel with aluminum

Zhenyang LU, Pengfei HUANG, Wenning GAO, Yan LI, Hanpeng ZHANG, Shuyan YIN

期刊论文

核爆聚变电站──人类未来能源的希望

彭先觉,刘成安,陈银亮,郭 勤,尹文华,白云,陈小伟,屈明

期刊论文

Development and testing of a wireless smart toolholder with multi-sensor fusion

期刊论文

一种基于粗糙集的模糊信息融合方法及应用

陈双叶,张微敬

期刊论文