Military missions in hostile environments are often costly and unpredictable,with squadrons sometimes facing isolation and resource scarcity.In such scenarios,critical components in vehicles,drones,and energy generato...Military missions in hostile environments are often costly and unpredictable,with squadrons sometimes facing isolation and resource scarcity.In such scenarios,critical components in vehicles,drones,and energy generators may require structural reinforcement or repair due to damage.This paper proposes a portable,on-site production method for molds under challenging conditions,where material supply is limited.The method utilizes large format additive manufacturing(LFAM)with recycled composite materials,sourced from end-of-life components and waste,as feedstock.The study investigates the microstructural effects of recycling through shredding techniques,using microscopic imaging.Three potential defense-sector applications are explored,specifically in the aerospace,automotive,and energy industries.Additionally,the influence of key printing parameters,particularly nonparallel plane deposition at a 45-degree angle,on the mechanical behavior of ABS reinforced with 20%glass fiber(GF)is examined.The results demonstrate the feasibility of this manufacturing approach,highlighting reductions in waste material and production times compared to traditional methods.Shorter layer times were found to reduce thermal gradients between layers,thereby improving layer adhesion.While 45-degree deposition enhanced Young's modulus,it slightly reduced interlayer adhesion quality.Furthermore,recycling-induced fiber length reduction led to material degradation,aligning with findings from previous studies.Challenges encountered during implementation included weak part adherence to the print bed and local excess material deposition.Overall,the proposed methodology offers a cost-effective alternative to traditional CNC machining for mold production,demonstrating its potential for on-demand manufacturing in resource-constrained environments.展开更多
To maintain the stability of the inter-satellite link for gravitational wave detection,an intelligent learning monitoring and fast warning method of the inter-satellite link control system failure is proposed.Differen...To maintain the stability of the inter-satellite link for gravitational wave detection,an intelligent learning monitoring and fast warning method of the inter-satellite link control system failure is proposed.Different from the traditional fault diagnosis optimization algorithms,the fault intelligent learning method pro-posed in this paper is able to quickly identify the faults of inter-satellite link control system despite the existence of strong cou-pling nonlinearity.By constructing a two-layer learning network,the method enables efficient joint diagnosis of fault areas and fault parameters.The simulation results show that the average identification time of the system fault area and fault parameters is 0.27 s,and the fault diagnosis efficiency is improved by 99.8%compared with the traditional algorithm.展开更多
In the canonical view of lunar evolution,mare basalts are regarded as secondary partial melts of deep-seated lunar mantle formed as cumulates from a lunar magma ocean(LMO)during the early stage of lunar magmatism[1].M...In the canonical view of lunar evolution,mare basalts are regarded as secondary partial melts of deep-seated lunar mantle formed as cumulates from a lunar magma ocean(LMO)during the early stage of lunar magmatism[1].Mare basalts filled mainly near-side lunar basins and occupied approximately 17%of the lunar surface[2].Mare volcanism is a long-lived process(1.0 to 4.4 Ga)that primarily involved the emplacement of lunar basins during the era of large impact basin formation(3.5-3.8 Ga)[1].Some earlier pulses of volcanism(prior to 3.9 Ga)also existed on the moon but covered only a small area(2%)in the form of cryp-tomare basalts[3].Ancient lunar basalts are relatively enriched in Al,K,and rare earth elements(REEs).Representative rocks include high-Al,high-K,K-REE-P-rich rock(KREEP)and some cryp-tomare basalts[1],which were emplaced at the surface during a continuous episode contemporaneous with lunar crust formation[1].Younger patches of mare volcanism(as late as 1.0 Ga)have been recognized via remote sensing techniques[2].However,only the Chang’E 5(CE5)samples provided solid evidence for 2.0 Ga young volcanic activity[4,5].Mare volcanism on the lunar far side,while relatively sparse,follows a similar temporal distribution pat-tern[6].展开更多
基金Generalitat Valenciana(GVA)and Spanish Ministry of Science and Innovation(Grant Nos.TED2021-130879 B-C21,CIACIF/2021/286,PID2023-151110OB-I00,and CIPROM/2022/3)to provide funds for conducting experiments and software licensessupported by the National Research Foundation,Prime Minister's Office,Singapore under its Campus for Research Excellence and Technological Enterprise(CREATE)programme。
文摘Military missions in hostile environments are often costly and unpredictable,with squadrons sometimes facing isolation and resource scarcity.In such scenarios,critical components in vehicles,drones,and energy generators may require structural reinforcement or repair due to damage.This paper proposes a portable,on-site production method for molds under challenging conditions,where material supply is limited.The method utilizes large format additive manufacturing(LFAM)with recycled composite materials,sourced from end-of-life components and waste,as feedstock.The study investigates the microstructural effects of recycling through shredding techniques,using microscopic imaging.Three potential defense-sector applications are explored,specifically in the aerospace,automotive,and energy industries.Additionally,the influence of key printing parameters,particularly nonparallel plane deposition at a 45-degree angle,on the mechanical behavior of ABS reinforced with 20%glass fiber(GF)is examined.The results demonstrate the feasibility of this manufacturing approach,highlighting reductions in waste material and production times compared to traditional methods.Shorter layer times were found to reduce thermal gradients between layers,thereby improving layer adhesion.While 45-degree deposition enhanced Young's modulus,it slightly reduced interlayer adhesion quality.Furthermore,recycling-induced fiber length reduction led to material degradation,aligning with findings from previous studies.Challenges encountered during implementation included weak part adherence to the print bed and local excess material deposition.Overall,the proposed methodology offers a cost-effective alternative to traditional CNC machining for mold production,demonstrating its potential for on-demand manufacturing in resource-constrained environments.
基金This work was supported by the National Key Research and Development Program Topics(2020YFC2200902)the National Natural Science Foundation of China(11872110).
文摘To maintain the stability of the inter-satellite link for gravitational wave detection,an intelligent learning monitoring and fast warning method of the inter-satellite link control system failure is proposed.Different from the traditional fault diagnosis optimization algorithms,the fault intelligent learning method pro-posed in this paper is able to quickly identify the faults of inter-satellite link control system despite the existence of strong cou-pling nonlinearity.By constructing a two-layer learning network,the method enables efficient joint diagnosis of fault areas and fault parameters.The simulation results show that the average identification time of the system fault area and fault parameters is 0.27 s,and the fault diagnosis efficiency is improved by 99.8%compared with the traditional algorithm.
基金supported by the National Key Research and Development Program of China(2021YFA0716100)the Science and Technology Development Fund,Macao SAR(002/2024/SKL)+1 种基金the National Natural Science Foundation of China(42202260)the Minor Planet Foundation of China.
文摘In the canonical view of lunar evolution,mare basalts are regarded as secondary partial melts of deep-seated lunar mantle formed as cumulates from a lunar magma ocean(LMO)during the early stage of lunar magmatism[1].Mare basalts filled mainly near-side lunar basins and occupied approximately 17%of the lunar surface[2].Mare volcanism is a long-lived process(1.0 to 4.4 Ga)that primarily involved the emplacement of lunar basins during the era of large impact basin formation(3.5-3.8 Ga)[1].Some earlier pulses of volcanism(prior to 3.9 Ga)also existed on the moon but covered only a small area(2%)in the form of cryp-tomare basalts[3].Ancient lunar basalts are relatively enriched in Al,K,and rare earth elements(REEs).Representative rocks include high-Al,high-K,K-REE-P-rich rock(KREEP)and some cryp-tomare basalts[1],which were emplaced at the surface during a continuous episode contemporaneous with lunar crust formation[1].Younger patches of mare volcanism(as late as 1.0 Ga)have been recognized via remote sensing techniques[2].However,only the Chang’E 5(CE5)samples provided solid evidence for 2.0 Ga young volcanic activity[4,5].Mare volcanism on the lunar far side,while relatively sparse,follows a similar temporal distribution pat-tern[6].
