The magnetic field modeling methodology for ships based on magnetic dipole arrays demonstrates heightened sensitivity to input data. When addressing overdetermined systems characterized by numerous variables and constrained measurement points, the coefficient matrix frequently develops pathological ill-conditioning, leading to solution divergence and compromised result accuracy. This research reformulates the ship magnetic field inversion challenge as a non-convex quadratic programming problem, employing the Successive Convex Approximation (SCA) algorithm as the computational solver. Rigorous comparative validation was performed against conventional stepwise regression algorithms and experimental datasets acquired from scaled ship model measurements. Results substantiate that while the modeling precision of the SCA algorithm remains comparable to that achieved by stepwise regression methods, SCA exhibits demonstrably superior solution stability. This enhanced robustness positions SCA

Chen, Hao, Pan, Xun

Human-Machine Ergonomics Analysis of Civil Aircraft Electric Pilot Seats

2026-99-0570

7/10/2026

This paper uses a structured evaluation framework to study the ergonomics of electric pilot seats in modern civil aircraft. We have established a multi-level indicator system to examine the adjustability, pressure distribution, dynamic response and, fatigue relief effect of the seat. All experimental data were obtained from a full-scale cockpit simulator environment, where a ground-based mock-up and motion-free simulated cockpit were used to replicate real operational posture, control-reach conditions, and long-duration mission loads. This framework combines experimental measurement and fuzzy evaluation techniques to quantify the quality of human-computer interaction. Test results show that compared with ordinary seats, the prototype seat has a wider adjustment range, a more uniform pressure distribution, and a smoother dynamic response. It is particularly worth mentioning that it can delay the emergence of fatigue during long-term operation, which proves the advantages of the electric

Tian, Yanan, Pi, Zhengyang

Temperature Influence Analysis and Compensation Method of Hemisphere Resonator Gyroscope

2026-99-0514

7/10/2026

Hemisphere resonant gyroscope (HRG) is a new type of vibration gyroscope with high precision, high reliability, and long lifespan. Improving the temperature stability of a hemispherical resonant gyroscope (HRG) has profound implications for navigation and guidance systems as well as airborne sensor technology. By optimizing temperature compensation algorithms or improving material thermal properties, the angular velocity measurement error caused by temperature drift can be significantly reduced, thereby improving the long-term positioning reliability of navigation systems in extreme temperature fluctuation scenarios. This article starts with the structure of the hemispherical resonant gyroscope, studies the temperature characteristics of the hemispherical resonator through formula theory, verifies and analyzes the temperature characteristics of the hemispherical resonant gyroscope through experiments, and designs a temperature compensation scheme. Through experimental data analysis

Wang, Jiachen, Chen, Pu, Yao, Zhiqiang, Zhang, Yi, Bai, Fan

Effect of Micro-Morphology on Thermal Radiation Properties of TC4 Alloy

2026-99-0512

7/10/2026

With the development of manned spaceflight and deep space exploration, TC4 alloy has been used for the structure design of aircraft due to its excellent characteristics. Thermal radiation properties (solar absorptance and hemispheric emittance) of TC4 alloy are becoming important design indices. We investigated TC4 alloys with different surface morphologies and the effect of micro-morphology on thermal radiation properties. The results show that the solar absorptance of the alloys is sensitive to surface roughness and microstructure. As the surface roughness or crack increases, solar absorptance increases. Hemispheric emittance of the alloys increases as surface roughness is added, but it is insensitive to the micro-nanostructure of the alloys.

Liu, Yang, Zhu, Xiaoxi, Ren, Chaolong, Li, Dasong, Wan, Lei, Huang, Feiyu

Study on Mechanical Performances and Fatigue Life of the Compensation Ropes in High-Speed Railway Contact Network

2026-99-0515

7/10/2026

The compensation rope is a special steel wire rope used as a driving component in the ratchet device. The compensation rope will endure severe random cycling loading during service time, which will lead to fatigue failures and catastrophic disasters. Experimental studies are hard to mimic the practical working conditions and time consuming, therefore, this study establishes a finite element model of the compensation rope and simulates the stress distribution under axial tensile and bending loads. Fatigue life is analysed based on both stress and strain fatigue theories under alternating tensile and bending loads. The results indicate that under axial tensile loads, the stress in the outermost wires of the core strands of the compensation rope is the largest, with the minimum fatigue life. As the stress ratio of the alternating tensile load increases, the fatigue life also improves due to smaller stress amplitudes. Under the conditions of bending loads, the outermost wires of the

Du, Fei, Cong, Jiajia, Bian, Haoxiang, Zhu, Junchen, Zhao, Aiguo

Analysis of the Influence of Space Environmental on the Thermal Radiation Performance and Surplus of a Multilayer Insulation

2026-99-0575

7/10/2026

Thermal shock, space combined irradiation test, and humidity test were carried out on one type of multilayer insulation. We summarized and analyzed the change in solar absorptance and hemispheric emittance before and after the environmental test. At the same time, the thermal stability and vacuum pollution characteristics were investigated by thermal weightlessness test and thermal vacuum outgassing test. The results show that the change in thermal radiation performance before and after the environmental test is no more than 0.02, the heat resistance is 350 °C, TML is 0.50%, and CVCM is 0.05% at 135 °C. It is observed that the thermal radiation performance of the material is hardly degraded by thermal shock, and humidity and space combined irradiation. The multi-layer insulation shows good thermal radiation characteristics, thermal stability, and low space pollution characteristics.

Li, Weiyu, Liu, Yang, Li, Xiujie, Sun, Shu, Huang, Feiyu, Yang, Yaodong

Steel, Bars, Forgings, Mechanical Tubing, and Forging Stock, 0.50Cr - 0.12Mo (0.89 - 1.01C)

AMS6476G (Current)

7/8/2026

This specification covers a low-alloy steel in the form of bars, forgings, mechanical tubing, and forging or tubing stock.

AMS E Carbon and Low Alloy Steels Committee

Biofuel Effect on Regeneration Capability and Soot Reactivity in SCRoF Systems

2026-01-0750

7/1/2026

Biodiesel blends (B7, B20, B100) were evaluated in a Stage V-compliant SCR on Filter (SCRoF) system for heavy-duty applications to quantify soot reactivity and filter regeneration capability. Compared to conventional diesel (B7), B20 showed slightly faster regeneration performance under real-driving conditions, while B100 resulted in reduced particulate formation and higher soot reactivity, with more intense exothermic events requiring careful management. These differences are attributed to the distinct physical-chemical properties of the fuels (oxygen content, lower heating value) and their interaction with Diesel Oxidation Catalyst (DOC)/SCRoF. All tests were conducted on an engine dynamometer with a Cursor 9 FPT (Fiat Powertrain). Findings are discussed in the context of EU Stage V limits and practical control strategies for heavy-duty applications.

Costa, Simone

Passive Thermal Management of Battery Disconnect Units for Fast-Charging Electric Vehicles: A Comparative Study of Phase Change Material Heat Transfer Configurations

2026-01-0759

7/1/2026

The widespread adoption of electric vehicles is currently hindered by long charging durations and limited infrastructure. While fast-charging technologies address these issues, they impose significant thermal loads on high-voltage components. Within this architecture, the Battery Disconnect Unit plays a critical role as it monitors and controls the connection between the battery, powertrain, and charging system. However, the high currents required for fast-charging often drive these units' temperatures beyond safe operating limits, necessitating advanced thermal solutions that do not require extensive redesigns of the vehicle's electrical layout. To address this challenge, this study proposes a passive thermal management solution using Phase Change Material heat transfer devices to enhance the thermal robustness of the component. The methodology employs a dual approach involving initial experimental testing to pinpoint specific thermal hotspots under high-power conditions, followed by

Salameh, Georges, Goumy, Guillaume, Frecinaux, Anthony, Ratajczack, Christelle, Palluel, Marlène, Noiseau, Pascal, Lardeux, Sébastien

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