bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and structural analysis of high payload C1 container
Authors: Cheng K J , Lees C H , Peng C C 
Published: November 2024

Abstract
To meet the need of storing the nuclear facility dismantling wastes in Taiwan, National Atomic Research Institute (NARI) plans to develop a new type of low-level radioactive waste container based on the exterior specifications of the existing C1 container but with higher payload. Currently, the design of this container has been finished, and the associated structural analyses specified in the regulations have also been done. In this article, it summarizes what NARI has performed and what NARI plans to do for the development of this container. It includes not only the information of C1 container and its actual applications but also the design specifications and the associated numerical analyses of the container under development. Based on the analysis results, the container under development satisfies the requirements of the low-level radioactive waste storage container and the industrial package type 2. Currently, NARI has entrusted a local vendor to fabricate the prototypes of this container and perform the specified tests in the second half of 2024. The usage permit application of this container will be submitted to the authority agency in the first half of 2025. Hopefully, the usage permit could be granted in 2026.
Micro-injection molding applied to production of optical products-example of lens
Authors: Chiu C H , Lu J R , Su W Y , Chen C C 
Published: November 2024

Abstract
Injection moulding is essential for the mass production of plastic products. This study focuses on the application of micro-injection moulding to produce optical products using self-designed moulds and core structure processing techniques. The chosen material for injection is acrylic PMMA, renowned for its excellent finish, weather resistance, heat resistance, transparency, and gloss. Post-injection, the products were evaluated for their optical properties. The TRIZ analysis provided insights into problem-solving directions and cost reduction strategies. The implementation of a one-mould, four-cavity design enabled mass production, significantly enhancing production efficiency.
Assessment of aluminium alloys’ formability by elevated temperature testing
Authors: Ali M S , Chen W L , Hsuan H , Yang Y L 
Published: November 2024

Abstract
This work presents an investigation of the warm formability of AA7075-T6 aluminium alloy sheets using both experimental and numerical methods. Forming limit diagrams (FLDs) can be created by plotting the failure criteria on a graph with two axes representing major and minor strains. Sheets with a grid can be used to quantify both large and minor strains. General techniques available for the grid involve regular patterns of circles in this experiment. Experiments were conducted at various temperature levels, including room temperature, 100, 120, 140, 160, and 180 °C, as well as different strain rates. The investigation has revealed a significant impact of temperature on formability, while the effect of forming speed is quite insignificant across the whole range studied. At an ageing temperature of 140 °C, the distribution of precipitates is evenly balanced, resulting in improved mechanical strength. To offer accurate numerical models for warm-forming processes, a proposed constitutive model is introduced for aluminium alloy sheets. The present model incorporates plastic anisotropy and the effects of temperature and strain rate dependence. An investigation was conducted on the stress-strain behaviour of thin sheets composed of AA7075-T6 aluminium alloy under elevated temperatures and different strain rates. The objective was to ascertain the appropriate fitting parameters. It was associated with ABAQUS finite element modelling. The recommended material model was utilized to build finite element models, which were subsequently compared to the experimental data. The findings obtained from simulated isothermal uniaxial tensile tests were compared to the empirical measurements. The models used in the tensile test accurately predicted the material’s mechanical response. The predicted failure location, punch forces, and strain distributions for all three forming processes were found to be in close agreement with the experimental results. During deep draw operation, the warm forming limit curves were utilized to precisely predict both the pierce depth at which failure occurs and the precise location where the failure initiates.
Determination of process parameters for additive manufacturing with Inconel 718 powder
Authors: Lee J N , Chen T H , Shie M J , Ye Z L 
Published: November 2024

Abstract
In this study, the additive manufacturing (AM) of Inconel 718 was investigated, and the processing parameters can affect the mechanical properties of the product. The five-axis laser cladding composite processing machine Tongtai AMH-630 is used, and the laser power is set to 800W based on the thermal impact of the laser on the base plate. However, the laser scanning speed (600-1200mm/min) and powder feed rate (3~15g/min) are not arbitrary combinations. It is recommended to present the feed per unit length in g/mm, which seems to be more clearly expressed. Regardless of changes in laser scanning speed and wheel speed, it is a reasonable decision to control the combination of the two at about 0.01-0.013g/mm. Through single-pass cladding experiments, we select different combinations of laser scanning speed and powder feed rate with a cladding aspect ratio in the range of 3:1 to 4:1. In the multi-pass cladding experiment, an overlap rate of 30% was used as the plane cladding spacing; a spacing of 80% of the cladding height was used as the stacking height. This study uses scanning speeds of 600, 700, 800, 1000 and 1200mm/min to clad a rectangular body. Tensile test specimens were processed using a CNC lathe, and tensile tests were conducted to obtain variations in tensile strength and elongation at different scanning speeds. The mechanical properties of both will decrease as the scanning speed increases. At a scanning speed of 600mm/min, its tensile strength is comparable to that of Inconel 718 standard materials; but its elongation is 61% of that of standard materials. If Hot Isostatic Pressing (HIP) is applied after cladding, it seems that a higher scanning speed can achieve a performance closer to that of standard materials.
Integrating machine vision in the development of automatic mounting system for massive electroplating components
Authors: Lee C H , Huang P H , Ye J W 
Published: November 2024

Abstract
The traditional industrial electroplating parts manufacturing process typically relies on manual labour to suspend them in the electroplating tank, requiring a significant amount of manual work. However, due to a shortage of manpower and frequent staff turnover, this has posed challenges to production efficiency. Therefore, this research proposes an automated mounting system by integrating machine vision technology and the development of robotic arms to replace the conventional manual suspension method. The automated mounting system initially separates individual ring-shaped electroplating components using a disk vibratory feeder. Subsequently, it utilizes a unidirectional reciprocating mechanism and infrared detection to position these electroplating components onto a backlit panel. Then, the IDS uEye XS2 autofocus camera captures images, and in conjunction with machine vision technology, rapidly determines the position, characteristics, and orientation of these ring components. Finally, through TCP communication protocol, commands for gripping points are transmitted to the robotic arm, which uses electromagnetic valves on the arm to pick up the components and suspend them onto the hanger using an optimized path. The final test results demonstrate that the automated installation system can complete 14 installation operations per minute, effectively reducing the time and cost associated with manual labour, significantly enhancing the production output of the assembly line. Therefore, this study combines machine vision technology to propose a solution for the automated installation system of large-scale electroplating components.
Effect of sodium tungstate concentration on surface morphology and hardness variation of 6063 aluminium alloy using by plasma electrolytic oxidation
Authors: Chen H L , Lu T H , Lin W C , Chiu S X 
Published: November 2024

Abstract
The coatings were prepared on the surface of 6063 aluminium alloy using by plasma electrolytic oxidation in a sodium tungstate (Na2WO4) electrolyte solution with concentration varying from 0.017 to 0.068 mol/L. The power of plasma electrolytic oxidation is about 600 W, electrolysis time is 20 and 30 minutes, respectively. In this study using sodium tungstate as the main component of the electrolyte without any additives. The effects of Na2WO4 concentrations on the surface morphology and hardness variation of the 6063 aluminium alloys are investigated. These oxide films on aluminium were characterized by laser scanning confocal microscope, scanning electron microscopy (SEM) and Vickers microhardness indenter (Hv), respectively. The results reveal Na2WO4 electrolyte solution with concentration varying from 0.017, 0.034, 0.051 to 0.068 mol/L. When the electrolyte concentration is 0.034 mol/L, the maximum hardness value is 104 Hv after plasma electrolytic oxidation for 20 minutes. When the electrolyte concentration is 0.051 mol/L, the minimum surface roughness value obtained by plasma electrolytic oxidation for 30 minutes is Sa 0.324 μm.
Lateral-directional stability and control augmentation system design for civil aircraft simulator
Authors: Chen Lei , Xie Gangtao 
Published: November 2024

Abstract
In this paper, we first introduce the necessity, history, and classification of stability and control augmentation systems. The structure of the lateral-directional stability and control augmentation control system in the normal mode is studied, and a comparison of advantages and disadvantages of several design schemes including yawing rate feedback, rolling rate feedback, and sideslip angle feedback is given. Lateral-directional stability and control augmentation control law for a certain type of civil aircraft simulator is designed. Finally, the stability and control augmentation system is simulated and the simulation results are analyzed, which shows that the handling qualities of the aircraft with stability and control augmentation system are better than those without it.
Optimization of Composite Wheel Fender for Manned Lunar Vehicle
Authors: Shen Zhenghui , Yin Yulei , Zhang Chongfeng , Li Tao , Fu Hongwen 
Published: November 2024

Abstract
Weight reduction is the eternal theme of aerospace optimization. In the process of weight reduction, the main ways are material change, structural change, and processing method change. In the process of aerospace structure design, the boundary and load conditions are more complicated, which restricts the development of optimization technology in the aerospace field to some extent. At present, the research object of optimization technology in the aerospace field is mainly the large parts of the aerospace craft, and the structural optimization of small aerospace parts is rarely involved. Therefore, the research of structural optimization design method has important theoretical and engineering significance. A complete optimization design process is proposed, the structural performance of aviation products is simulated by finite element software, and the feasibility of the optimization theory is verified. This article mainly compares several schemes for weight reduction design of composite material wheel fenders in the process of design.
Research on machining technology of stepped boring for intersecting holes in aircraft
Authors: Chen Xuezhen , Liu Chun , Song Jinhui , Cheng Cheng , Kang Zhiwen , He Yufan , Tian Changle , Yu Long , Hao Long , Guo Wei , Luo Jiang 
Published: November 2024

Abstract
During the assembly process of a large-scale aircraft fuselage, critical bearing areas require the drilling of intersecting holes, which are commonly processed using traditional single-edged reamers by most domestic manufacturers. To improve the efficiency and accuracy of the finishing process for these holes, enhance the quality of the assembly, and further shorten the construction cycle for precision processing, improvements need to be made to traditional single-edge reamer machining methods. This paper proposes a new approach that uses stepped reamers to machine intersecting holes. By setting up an experimental platform to simulate actual processing conditions and optimize processing parameters, the study analyzes and compares the quality and efficiency of traditional reaming and stepped reaming modes. The results show that stepped reaming can improve processing efficiency by 50.6% compared to traditional machining while also reducing human intervention and minimizing quality risks. The findings from this research project can be extended to various aircraft fuselages or wings for precise drilling of intersecting holes, providing significant guidance for efficient and high-quality delivery of aircraft.
Study on the influence of expansion waves on the reflection type of shock wave in double-wedge configurations
Authors: Wang Liyao , Yang Li , Yue Lianjie 
Published: November 2024

Abstract
This paper investigates how variations in the relative positioning between the expansion fan emitted from the triple point in the shock/shock interference on double-wedge geometries in confined spaces and the incidence point of oblique shocks influence the transition of oblique shock reflection types, and understands the roles of expansion waves in inhibiting MR. Predictive analysis through the shock polar line provides critical values for the transition of oblique shock reflection types under the influence of expansion fan effects. The position where the shock/expansion fan undergoes post-oblique reflection on the opposite sidewall can be controlled by adjusting the model’s contraction ratio (H
1/H
2). This study uses the density-based solver blastFOAM in openFOAM to numerically solve the Euler equations, conducting inviscid calculations of shock/shock interactions induced by double wedges in confined spaces with ideal gases. This study compares pressure values in different regions obtained from numerical simulations and examines the reflection types of oblique shocks on opposite sidewalls, confirming the feasibility of shock polar analysis and the accuracy of theoretical predictions.
Longitudinal SCAS design and simulation for civil aircraft simulator
Authors: Xie Gangtao , Qu Xiaoyu , Chen Lei 
Published: November 2024

Abstract
In this paper, the principle and benefits of stability and control augmentation system (SCAS) are introduced. Four schemes of the longitudinal SCAS for civil aircraft in normal mode are analyzed and compared. One of them, i.e., C * response type, is selected. Its architecture is determined. Then, based on a typical civil aircraft, the flight control law of the longitudinal SCAS is designed. A simulation model of the longitudinal SCAS is established through MATLAB software. Finally, the simulation and verification of the longitudinal SCAS model is carried out. The simulation results show that the designed longitudinal SCAS is feasible and can be applied to engineering practice. Compared with either normal load or pitch rate command response type, with proportional and integral feedback for mixed control signals of pitch rate and normal load, C * not only improves the short period characteristics but also effectively separates phugoid and short period frequencies, thus achieving high control accuracy.
Experiment study on the influence of component separation on civil aircraft ditching
Authors: Luo Wenli , Chen Shuyong , Fang Wei , Chang Liang 
Published: November 2024

Abstract
In order to meet the requirements of airworthiness regulations, research focusing on the influence of component separation on water impact loads during civil aircraft ditching was carried out through a series of scaled aircraft experiments. The engines, flaps and landing gear doors, which may affect impact force and airtightness, were sufficiently considered. The time history of pitch angle, acceleration and pressure distribution were measured and fully compared with the intact aircraft. The results show that different with the separation of flaps and landing gear doors, the breaking of engines will lead to severe impact response due to the increased suction force. The airtightness can be ensured even if the landing gear doors fall off since the impact load on the internal structure is relatively low, but the load on the wing body fairing will increase. Finally, the influence on the total ditching overload is discussed, which indicates that the overload of aircraft with an open engine inlet is the highest of an 8.7% increase.
Flight experimental analysis of largemulti-propeller airtanker dropping capability
Authors: Wang Shifei , Li Zhuopeng , Cheng Zhihang , Zhang Ling 
Published: November 2024

Abstract
In the absence of a dropping capability experiment of domestic airtankers, it is necessary to know the actual dropping capability of fixed-wing airtankers for data support to wildfire-fighting, improving fire-fighting efficiency, and reducing the loss of forest and grassland resources. According to the design characteristics of large multi-launch propeller airtankers in China, this experiment shall collect retardant samplesof the filled flame retardant with collection equipment on the flat ground after being dropped by the airtanker in the air. Then, the sample coverage was counted and contour maps of the ground patterns were plotted to compare the dropping coefficients, dropping heights, and dropping speeds of the different dropping modes. At the last, according to the comparison result, the best dropping strategy shall be shown in different requirements. The result shows that when the coverage level is required to be GPC-6, the maximum coverage shall be obtained by all compartments released simultaneously, with a maximum coverage coefficient of 0.16. When the coverage level is required to be GPC-1, it is better to release the retardant from the tank independently with a suitable interval for larger coverage, and the maximum coverage coefficient is 4.49.
Wind turbine blade health state assessment based on fuzzy evaluation
Authors: Zhang Lixin , Zhou Bo , Wang Suisui , Sun Ning , Zheng Haocheng 
Published: November 2024

Abstract
Due to the health state of wind turbine blade being affected by many factors and the mechanism being unclear, a fuzzy evaluation method using SCADA information is proposed. Firstly, the index structure of blade health state assessment is determined by correlation analysis of SCADA data. Secondly, entropy weight is used to allocate weights to all levels of parameters, and then the index data degradation function is optimized by the 3σ criterion. Thirdly, the ridge distribution function is utilized to establish the membership function of the health indexs. Finally, a mathematical model is created for the fuzzy comprehensive assessment of the blade health status. The described techniques is employed to assess the blade health state in the Qingdao wind farm. The “healthy” and “dangerous” states of the blade can be distinguished. The assessment result aligns with reality, verifying that the method in this paper is applicable to the blade health state assessment of wind farms.
Study on solid powder fuel transport characteristics and mixing degree in scramjet combustor
Authors: Liu Tianwei , Fang Shuzhou 
Published: November 2024

Abstract
The powder scramjet engine is considered the best engine for hypersonic weapons because of its advantages of easy adjustment, flame stability, and high efficiency. However, due to the extremely short residence time of particle fuel in the combustion chamber under high Mach conditions, there is a risk of fuel mixing. Based on the existing combustion chamber models of scramjet engines, this paper proposes a new solid fuel blending enhancement structure by combining shock generator structure and transverse jet and compares the performance and mass transfer characteristics of different shock generators. The CFD method is used to solve the RANS formula to simulate the particle transfer process, and the SST k-ω model is used to calculate the complex turbulence. It was found that when the reverse shock generator was used, the mixing degree of solid particles was higher.
Pressure control and support technology for spacecraft space exploration
Authors: Liu Huahua , Xuan Jianqiang , Meng Yao , Han Yan , Wang Donghui 
Published: November 2024

Abstract
As a top-level requirement for ensuring the exploration work inside and outside the spacecraft, the cabin pressure control technology of the spacecraft ensures the safety of astronauts and is one of the core systems for maintaining astronaut space exploration. This article introduces the pressure control and support technology for space environment exploration and constructs a cabin pressure control model. Through simulation verification, the constructed model meets the requirements of spacecraft cabin pressure control, and can effectively save the extravehicular activity air source. This technology can provide a reference for pressure support systems for manned space stations, Mars, and lunar exploration spacecraft.
Vibration optimization methods of dredger engine room
Authors: Zhang Yong , Li Chengjun , Qiao Guorui , Sun Xuerong , Chen Shumei 
Published: November 2024

Abstract
Due to the large number and heavy weight of equipment, as well as the high center of gravity in the cabin area of dredgers, the concentrated arrangement of equipment is prone to local vibration problems in the cabin area. Additionally, there are many devices that need to be placed under the deck in the cabin area, which imposes significant constraints on the placement of supports. Using the finite element method to analyze the vibration problem of a certain dredger, we studied the influence of different equipment arrangements and structural reinforcement methods on vibration. This allowed us to summarize the characteristics of vibration under different improvement methods, providing feasible solutions for improving the vibration problem in the cabin area of dredgers. After adjusting the equipment layout and reinforcing local structures, the vibration in the dredger’s cabin area ultimately meets the design requirements satisfactorily.
Study on the energy absorption characteristics of multi-spherical point-contact cushioning components
Authors: Sun Xiaoting , Wang Yi , Zhu Xiujie , Che Jinli , Wang Wei 
Published: November 2024

Abstract
Under the impact load, the weak parts in the structure are prone to damage, leading to the failure of the whole equipment to work properly. Selecting appropriate cushioning materials to resist impact is a commonly used technical method. Generally, the cushioning efficiency of cushioning materials is proportional to their thickness. For structures with unlimited space, the impact resistance can be improved by increasing the thickness of cushioning materials. However, for structures with limited space, ductile metals are generally selected as cushioning materials to absorb energy through plastic deformation. In this paper, a cushioning component with a multi-spherical point contact structure is designed and processed with ductile metal. Energy absorption properties of the structure under the same impact load with different spherical diameters and numbers are studied based on the Split Hopkinson Pressure Bar (SHPB) test. The test results show that under the same impact load, the larger the spherical diameter is, the smaller the impact deformation is. Energy absorption efficiency is proportional to the number and diameter of the spheres. The maximum energy absorption of the 4×Sϕ6 spherical structure is 26.6J, with an energy absorption rate of 37.3%. The research results provide guidance for the design of cushioning components under impact load.