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The control equipment for the integrated use of cold energy in LNG vessels LNG船冷能综合利用控制设备
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012012
Xin Liang, Liyuan Zheng, Xingzhi Lin
Abstract The design of control equipment for the cold energy recovery and utilization of LNG ships is the focus of ship technology and a prerequisite for equipment manufacture. By analyzing the design background and design status of LNG ship cold energy recycling control equipment, the study forms design ideas and prepares equipment materials. It optimizes design methods and compares and evaluates them with traditional control equipment. After a series of evaluation tests, it is found that the LNG ship cold energy comprehensive utilization control equipment can effectively achieve the purpose of energy saving and emission reduction and solve the problems of high operating costs and environmental pollution of traditional LNG ships.
LNG船舶冷能回收利用控制设备的设计是船舶技术的重点,也是设备制造的前提。通过分析LNG船冷能回收控制设备的设计背景和设计现状,形成设计思路,准备设备材料。对设计方法进行了优化,并与传统控制设备进行了比较和评价。经过一系列的评价试验,发现LNG船舶冷能综合利用控制设备能够有效地达到节能减排的目的,解决传统LNG船舶运行成本高、环境污染等问题。
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引用次数: 0
Mixed Horizontal Well Pattern and Fracturing Parameter Optimization of Low Permeability Reservoir 低渗透油藏混合水平井网布及压裂参数优化
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012007
Qi-hao Hu, Fa-jun Guo, Hong-qiang Cao, Xiu-wei Wang, Ya-zhou Wang, Xia Wang, Hong-tao Wang, Jie-feng Cao
Abstract Horizontal well fracturing development is significant in improving the development effect of low permeability reservoirs and is widely applied in many low permeability reservoirs of China. In this study, the reservoir numerical simulation is used to establish different mixed horizontal well networks of the target reservoir. The result shows that the best waterflood development effect is achieved when horizontal segment orientation and crack orientation are at an angle of 45°. The horizontal segment length and fracturing parameters of mixed horizontal well networks are optimized. It is considered that the rational horizontal segment length of the horizontal well is 400 m, the rational number of cracks is 3, and the optimal crack conductivity is between 180-200 mD.m. Through the study of mixed horizontal well network and fracturing parameter optimization, the low permeability reservoir efficient horizontal well fracturing development is well guided.
水平井压裂开发对提高低渗透油藏开发效果具有重要意义,在中国许多低渗透油藏中得到了广泛应用。本研究采用储层数值模拟的方法,建立了目标储层的不同混合水平井网。结果表明,水平段向与裂缝向夹角为45°时,注水开发效果最佳。对混合水平井网水平井段长度和压裂参数进行了优化。认为水平井合理水平段长度为400 m,裂缝有理数为3条,裂缝导流能力在180 ~ 200 mD.m之间。通过混合水平井网研究和压裂参数优化,为低渗透油藏高效水平井压裂开发提供指导。
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引用次数: 0
Numerical analysis of flow and heat transfer characteristics of supercritical endothermic hydrocarbon fuel in taper tube 超临界吸热碳氢燃料在锥形管内流动和传热特性的数值分析
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012011
Jiajun Zhao, Hui Gao, Chen Zhang, Dongsheng Wen
Abstract To enhance the cooling performance of the scramjet regenerative cooling system, a novel taper tube is proposed. Under supercritical pressure, the flow characteristics and heat transfer characteristics of endothermic hydrocarbon fuel (EHF) in taper tube, narrow cylindrical tube, and wide cylindrical tube are numerical investigated and compared. The results of the investigation of flow and heat transfer processes in the above three tubes indicate that the taper tube effectively facilitates the pyrolysis of n -decane and the n -decane conversion is increased by 3.94%, compared with narrow cylindrical tube. Compared with wide cylindrical tube, the taper tube enhances cooling effect and the wall temperature near the outlet is reduced by 50.16 K. The taper tube contributes to the cooling structure optimization and promotion of regenerative cooling system performance.
摘要为了提高超燃冲压发动机再生冷却系统的冷却性能,提出了一种新型的锥管冷却方法。对超临界压力下吸热烃类燃料在锥形管、窄圆柱管和宽圆柱管中的流动特性和换热特性进行了数值研究和比较。对三种管内流动和传热过程的研究结果表明,锥形管有效地促进了正癸烷的热解,与窄圆柱管相比,正癸烷转化率提高了3.94%。与宽圆柱管相比,锥形管的冷却效果更好,出口附近壁面温度降低了50.16 K。锥形管有助于优化冷却结构,提高蓄热冷却系统的性能。
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引用次数: 0
Performance optimization design of wide-body aircraft pressure refueling system 宽体飞机压力加油系统性能优化设计
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2633/1/012002
Hao Gong
Abstract In order to reduce the wide body aircraft refueling process time-cost and improve the airport operation efficiency, pressure refueling system design strategy was innovated. The shutoff valves’ operation sequence in refueling process was optimized. The diameter of the orifices on the pressure refueling system fuel line was designed. Pressure refueling performance was simulated and analyzed at different scenarios. The results show that it can improve the pressure refueling system performance at different scenarios by optimizing the pressure refueling process strategy design including optimizing the fuel line orifice design and optimizing the wing tank inner side shut-off valve operation sequence.
摘要为了降低宽体飞机加油过程的时间成本,提高机场运行效率,对压力加油系统的设计策略进行了创新。优化了换料过程中关闭阀的操作顺序。设计了压力加油系统燃油管路上的通孔直径。对不同工况下的压力加注性能进行了仿真分析。结果表明,通过优化燃油管路孔板设计和优化翼舱内侧截止阀操作顺序等压力加油工艺策略设计,可以提高不同工况下压力加油系统的性能。
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引用次数: 0
Experimental Study on Condensation Heat Transfer Performance of Hydrophilic/Hydrophobic Microstructured 亲/疏水微结构的冷凝换热性能实验研究
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012048
Zhiwei He, Enlong Wen, Tao Wang, Chao Huang, Shujie Li, Ruhua Cai
Abstract In order to study the condensation and heat transfer characteristics of similar microstructure surfaces, two similar microstructure surfaces, cylindrical and circular, were fabricated by femtosecond laser technology on a 0.5 mm silicon wafer. The cylindrical surface is superhydrophobic when the contact angle is more than 150°, and the circular surface is hydrophilic when the contact angle is less than 90°. The difference in condensation heat transfer characteristics between superhydrophobic and hydrophilic microstructures was analyzed, and a visual condensation experimental platform was built. Experimental research showed that: At the same flow rate, the heat transfer coefficient of the superhydrophobic surface and the hydrophilic surface decreases significantly with the increase of the surface subcooling degree, but the heat transfer coefficient of the cylindrical surface is still much larger than that of the circular surface. In addition, the heat transfer performance of the hydrophobic microstructure surface is better than that of the hydrophilic surface at medium and high-speed cooling water flow rates. Although the surface microstructures are similar in shape, the heat transfer performance of cylindrical microstructures is much better than that of circular microstructures under the same conditions, and the heat flux of cylindrical microstructures is 2.2 times that of circular microstructures.
摘要为了研究相似微结构表面的凝结和传热特性,利用飞秒激光技术在0.5 mm硅片上制备了圆柱形和圆形两个相似微结构表面。当接触角大于150°时,圆柱形表面是超疏水的,当接触角小于90°时,圆形表面是亲水的。分析了超疏水与亲水微观结构的冷凝换热特性差异,搭建了可视化冷凝实验平台。实验研究表明:在相同流量下,超疏水表面和亲水表面的换热系数随着表面过冷度的增加而显著降低,但圆柱形表面的换热系数仍然远大于圆形表面。此外,在中高速冷却水流量下,疏水微观结构表面的换热性能优于亲水性表面。尽管表面微结构形状相似,但在相同条件下,圆柱形微结构的传热性能远优于圆形微结构,其热流密度是圆形微结构的2.2倍。
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引用次数: 0
RGB and LiDAR Fusion-based 3D Semantic Segmentation for Autonomous Driving 基于RGB和LiDAR融合的自动驾驶3D语义分割
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012034
Jianguo Liu, Zhiling Jia, Gongbo Li, Fuwu Yan, Youhua Wu, Yunfei Sun
Abstract Projection-based multimodal 3D semantic segmentation methods suffer from information loss during the point cloud projection process. This issue becomes more prominent for small objects. Moreover, the alignment of sparse target features with the corresponding object features in the camera image during the fusion process is inaccurate, leading to low segmentation accuracy for small objects. Therefore, we propose an attention-based multimodal feature alignment and fusion network module. This module aggregates features in spatial directions and generates attention matrices. Through this transformation, the module could capture remote dependencies of features in one spatial direction. This helps our network precisely locate objects and establish relationships between similar features. It enables the adaptive alignment of sparse target features with the corresponding object features in the camera image, resulting in a better fusion of the two modalities. We validate our method on the nuScenes-lidar seg dataset. Our CAFNet achieves an improvement in segmentation accuracy for small objects with fewer points compared to the baseline network, such as bicycles (6% improvement), pedestrians (2.1% improvement), and traffic cones (0.9% improvement).
基于投影的多模态三维语义分割方法在点云投影过程中存在信息丢失的问题。这个问题对于小对象来说更加突出。此外,在融合过程中,稀疏目标特征与相机图像中相应目标特征的对齐不准确,导致小目标的分割精度较低。因此,我们提出了一个基于注意力的多模态特征对齐与融合网络模块。该模块聚合空间方向上的特征,生成注意力矩阵。通过这种转换,该模块可以在一个空间方向上捕获特征的远程依赖关系。这有助于我们的网络精确定位对象,并在相似特征之间建立关系。它可以使稀疏目标特征与相机图像中相应的目标特征自适应对齐,从而更好地融合两种模态。我们在nuScenes-lidar seg数据集上验证了我们的方法。与基线网络相比,我们的CAFNet在点较少的小物体上实现了分割精度的提高,例如自行车(提高6%),行人(提高2.1%)和交通锥(提高0.9%)。
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引用次数: 0
Power Equalization Strategy Based on Adaptive Virtual Impedance 基于自适应虚拟阻抗的功率均衡策略
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012018
Xiong Lv, Baoge Zhang, Hao Tian, Yongquan Ren, Fuhong Cui
Abstract Due to the differences in the line resistance of each distributed generation unit, conventional sag control does not allow for precise distribution of power, which also reduces the problem of system reactive power accuracy. To address this problem, this paper analyzes the power equalization and distribution conditions. A method for adaptive adjustment of virtual resistance by system output power feedback is submitted. Reducing the variance among the original line resistances aims to solve the problem of power not being evenly divided and improve the equalization of reactive power. By building a Simulink parallel simulation model of the inverter, it is verified that the power feedback-based fetching and the improved droop control is effective.
摘要由于各分布式发电机组的线路电阻存在差异,常规的暂降控制无法实现功率的精确分配,也降低了系统无功功率精度的问题。针对这一问题,本文分析了电力均衡和分配条件。提出了一种利用系统输出功率反馈自适应调整虚电阻的方法。减小原始线路电阻之间的方差是为了解决功率分配不均匀的问题,提高无功功率的均衡性。通过建立逆变器的Simulink并行仿真模型,验证了基于功率反馈的抓取和改进的下垂控制的有效性。
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引用次数: 0
Simulation Analysis Based on COMSOL Helicopter Time-domain Aeromagnetic Method 基于COMSOL直升机时域航磁法的仿真分析
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012033
Rui Su, Yiming Zhang, Dong Zhang, Junxia Gao
Abstract This paper takes the time-domain aeromagnetic system as the research object and uses the finite element software COMSOL Multiphysics 6.0 to establish the three-dimensional system model. By comparing the COMSOL Multiphysics forward simulation solution with the one-dimensional numerical solution, it verifies that the COMSOL software meets the simulation accuracy requirements of the three-dimensional time-domain aeromagnetic method, and focuses on the analysis of the transient response at different flight altitudes is also analyzed. Based on the analysis of this paper, a set of aeromagnetic parameters with high detection capability is determined for engineering practice, and a test of the system is completed.
本文以时域航磁系统为研究对象,利用有限元软件COMSOL Multiphysics 6.0建立系统三维模型。通过COMSOL多物理场正演仿真解与一维数值解的比较,验证了COMSOL软件满足三维时域航磁法的仿真精度要求,并重点分析了不同飞行高度下的瞬态响应。在分析的基础上,确定了一套具有较高检测能力的航磁参数,用于工程实践,并对系统进行了测试。
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引用次数: 0
A Novel Temperature Compensation Method for Surface Strain of Cylindrical Lithium-ion Batteries 圆柱形锂离子电池表面应变的温度补偿方法
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2636/1/012002
Rong Yao Sun, Lei Mao
Abstract In order to ensure the safe operation of lithium-ion batteries, real-time monitoring of battery status is necessary. The surface strain signal of lithium-ion batteries has the potential to evaluate the battery’s state, but it is significantly affected by temperature. Generally, measuring the battery surface temperature and the thermal expansion coefficient can be performed to quantify and eliminate the influence of temperature on strain, but this increases the cost and complexity of strain measurement. This article proposes a method that eliminates the need to measure the battery temperature and material parameters. By simultaneously measuring the circumferential and axial strains on the battery surface and calculating their difference, the influence of temperature on strain can be minimized. Furthermore, the effectiveness of the proposed method is experimentally tested. Results demonstrate that after applying temperature compensation to commercial lithium-ion batteries, the influence of temperature on strain can be reduced from 16.4 ppm/°C to 1.7 ppm/°C. The strain no longer exhibits sensitivity to current, making it more suitable for evaluating the state of lithium-ion batteries.
摘要为了保证锂离子电池的安全运行,需要对电池状态进行实时监控。锂离子电池的表面应变信号具有评估电池状态的潜力,但受温度影响较大。通常可以通过测量电池表面温度和热膨胀系数来量化和消除温度对应变的影响,但这增加了应变测量的成本和复杂性。本文提出了一种无需测量电池温度和材料参数的方法。通过同时测量电池表面的周向应变和轴向应变并计算其差值,可以最小化温度对应变的影响。最后,通过实验验证了该方法的有效性。结果表明,对商用锂离子电池进行温度补偿后,温度对应变的影响可以从16.4 ppm/°C降低到1.7 ppm/°C。该应变不再表现出对电流的敏感性,使其更适合评估锂离子电池的状态。
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引用次数: 0
Digitization of production line equipment of rail transit vehicles based on index and model 基于指标和模型的轨道交通车辆生产线设备数字化研究
Q1 OPTICS Pub Date : 2023-11-01 DOI: 10.1088/1742-6596/2632/1/012031
Hongyue Zhang, Jie Chang
Abstract In the process of digital transformation of rail transit vehicles, the digitalization of production line equipment is an important content. Starting from the whole life cycle business of production line equipment, this paper improves the existing production line equipment index system, proposes the production line equipment data acquisition model, describes the equipment portrait, proposes the comprehensive evaluation system based on the equipment index model, and further explores the digital twin architecture of production line equipment based on the integration of multiple models. Improve the digital level of rail transit vehicle manufacturing production line equipment.
在轨道交通车辆数字化改造过程中,生产线设备的数字化是一项重要内容。本文从生产线设备全生命周期业务出发,对现有生产线设备指标体系进行改进,提出了生产线设备数据采集模型,描述了设备画像,提出了基于设备指标模型的综合评价体系,并进一步探索了基于多模型集成的生产线设备数字孪生体系结构。提高轨道交通车辆制造生产线设备数字化水平。
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引用次数: 0
期刊
Journal of Physics-Photonics
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