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Experiment and Simulation Study on the Crashworthiness of Markforged 3D-Printed Carbon/Kevlar Hybrid Continuous Fiber Composite Honeycomb Structures.
Materials (Basel)
January 2025
Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.
Article Synopsis
- Fiber hybridization helps address brittle fractures in composite honeycombs, but different fiber interactions create complex failure mechanisms.
- Researchers 3D-printed honeycomb composites using carbon and Kevlar fibers to study their structural failure through experiments and simulations.
- Results showed that carbon/Kevlar composites had the best energy absorption and cost-effectiveness, while CFRP had the highest load capacity; the presence of Kevlar led to ductile failure, contrasting with the brittle failure seen in Onyx honeycombs.
Screen-Printed PVDF Piezoelectric Pressure Transducer for Unsteadiness Study of Oblique Shock Wave Boundary Layer Interaction.
Micromachines (Basel)
November 2024
Department of Microsystem Technology, University of Applied Sciences Berlin, 12459 Berlin, Germany.
Shock wave boundary/layer interactions (SWBLIs) are critical in high-speed aerodynamic flows, particularly within supersonic regimes, where unsteady dynamics can induce structural fatigue and degrade vehicle performance. Conventional measurement techniques, such as pressure-sensitive paint (PSP), face limitations in frequency response, calibration complexity, and intrusive instrumentation. Similarly, MEMS-based sensors, like Kulite sensors, present challenges in terms of intrusiveness, cost, and integration complexity.
View Article and Find Full Text PDFDistributed optimal control design with the feed-forward compensator for high-speed train.
ISA Trans
January 2025
The College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning, 110819, China. Electronic address:
The distributed optimal design of high-speed train movement is systematically investigated in this article. A distributed optimal control law is proposed, addressing the train consist of cars coupled by spring buffers, and is affected by aerodynamic drag and rolling resistance. A new distributed controller is proposed to decouple the train model by fully removing the in-train force, which greatly simplifies the complexity of calculation.
View Article and Find Full Text PDFNeural fields for rapid aircraft aerodynamics simulations.
Sci Rep
October 2024
ISAE Supaero (DAEP), Toulouse, France.
This paper presents a methodology to learn surrogate models of steady state fluid dynamics simulations on meshed domains, based on Implicit Neural Representations (INRs). The proposed models can be applied directly to unstructured domains for different flow conditions, handle non-parametric 3D geometric variations, and generalize to unseen shapes at test time. The coordinate-based formulation naturally leads to robustness with respect to discretization, allowing an excellent trade-off between computational cost (memory footprint and training time) and accuracy.
View Article and Find Full Text PDFStudy on wind load characteristics of gable roof under tornado.
Sci Rep
October 2024
Hebei Construction Group Co., Ltd, Shijiazhuang, 050035, China.
This research simulates the behavior of a tornado on a double-slope roof using the Ward tornado generator and the [Formula: see text] turbulence model. The effects of different ground roughness, slope angle, and wind field position on the tornado load characteristics of gable roofs were studied. The tornado-generating device established the tornado field under various working conditions, and the simulation results were compared with the experimental data to verify the reliability of the simulation results.
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