간행물
한국기계항공기술학회지(구 한국기계기술학회지) KCI 등재 Journal of the Korean Society of Mechanical and Aviation Technology
- 발행기관 한국기계항공기술학회(구 한국기계기술학회)
- 자료유형 학술지
- 간기 격월간
- ISSN 1229-604X (Print)2092-0385 (Online)
- 수록기간 1999 ~ 2026
- 주제분류 공학 > 기계공학 공학 분류의 다른 간행물
- 십진분류KDC 550DDC 620
권호리스트/논문검색
제28권 제3호 (2026년 6월) 33건
21.
2026.06
구독 인증기관 무료, 개인회원 유료
김재웅, 김영현, 이송은, 지영훈, 유동현, 하을용, 안기주, 정유일
Driven by stringent global CO2 emission regulations, the demand for offshore wind energy is rapidly expanding, necessitating structural materials with higher durability and strength for larger installations. Following our previous evaluation of S355ML steel welds (Part I), this study investigates the mechanical performance of Flux-Cored Arc Welding (FCAW) on S420ML steel. This higher-strength TMCP steel is increasingly preferred for large-scale offshore substructures to achieve enhanced structural efficiency and significant weight reduction. In this research, we evaluated the weldability and mechanical integrity of S420ML joints under optimized FCAW conditions. The experimental results demonstrated that the welded joints achieved a tensile strength of 598 MPa, exceeding the minimum requirements of the S420ML base metal and ensuring a joint efficiency of over 102%. Notably, Charpy V-notch impact tests at -50°C exhibited an average absorbed energy of 112.9 J, which significantly surpasses the standard requirement for offshore structures and demonstrates excellent low-temperature toughness. These findings provide critical technical validation for the application of S420ML steel in the next generation of offshore wind foundations.
4,000원
22.
2026.06
구독 인증기관 무료, 개인회원 유료
김재웅, 김영현, 이송은, 지영훈, 유동현, 하을용, 안기주, 정유일
As the capacity of offshore wind turbines continues to scale up, their massive substructures increasingly require thick TMCP steel plates exceeding 60 mm. While submerged arc welding (SAW) is preferred for its high deposition rate, ensuring root pass quality and low-temperature toughness in the heat-affected zone (HAZ) remains challenging. Following previous studies on S355ML (Part I) and 40 mm S420ML (Part II), this study (Part III) investigated a process using Flux-Cored Arc Welding (FCAW) for the root pass and SAW for the fill and cap passes. This approach aims to ensure root soundness while maximizing productivity for 60 mm thick S420ML steel. The welded joints demonstrated excellent mechanical integrity. Despite SAW’s high heat input, the joints achieved an average tensile strength of 548.5 MPa, meeting design requirements. Charpy V-notch tests at 50 °C revealed superior toughness in the SAW fill (70 J) and stable toughness in the FCAW root (57 J), both significantly exceeding the 27 J standard. These results confirm that the combined FCAW/SAW process effectively overcomes the thickness effect, providing an optimal balance between productivity and fracture toughness for offshore substructures.
4,000원
23.
2026.06
구독 인증기관 무료, 개인회원 유료
장일도, 이명군
As the domestic 1-ton truck market shifts from diesel vehicles to LPG and electrified vehicles, securing hydraulic power for aerial work platforms based on 1-ton LPG automatic-transmission trucks has become an important technical issue because conventional PTO systems are difficult to apply. In this study, the boom motion driving characteristics of a PTO-driven hydraulic system previously developed for a 1-ton LPG automatic-transmission truck were experimentally evaluated. The tests were conducted for representative boom motions, including swing, lifting/lowering, and extension/retraction. The motion ranges were set to ± 25° for swing, 0°~20° for lifting/lowering, and 5.5~10 m for boom extension/retraction. The load conditions were set to no load, 68 kg, and 200 kg, and hydraulic pressure, flow rate at the hydraulic valve inlet, and engine speed were measured under low-speed and high-speed operation conditions. The results showed that the developed PTO-driven hydraulic system successfully performed the main boom motions, confirming its applicability as an alternative PTO system for boom operation in an automatic-transmission aerial work platform. In the lifting motion, the hydraulic pressure response increased with load, while high-speed operation resulted in increased flow rate and engine speed. Therefore, the developed PTO-driven hydraulic system is considered applicable to boom operation in a 1-ton LPG automatic-transmission truck-based aerial work platform. However, because hydraulic pressure, flow rate, and engine speed responses vary depending on load and speed conditions, further improvement of flow control and engine speed control is required for stable operation.
4,000원
24.
2026.06
구독 인증기관 무료, 개인회원 유료
남궁장, 최승근, 조대환
In the steam turbine for combined cycle power generation operated for a long time, thermal and mechanical deformation is accumulated in the High-Intermediate Pressure (HIP) casing due to repeated start-up and stop under high temperature and high pressure conditions. This study attempted to quantitatively evaluate the deformation characteristics based on the measured data and analyze the effect of casing deformation on casing alignment and inner gap. To this end, the level of the horizontal split flange surface was precisely measured and analyzed for the two decomposed steam turbine high-pressure casing of the combined thermal power plants. As a result, Hogging deformation occurred throughout the casing, and a maximum strain deviation of 0.83 mm between the upper and lower casings was confirmed, and an asymmetric deformation tendency was confirmed in which the upper part was more than twice as large as the lower part. Based on this phenomenon, by estimating the amount of centerline movement and the change in the inner gap that can occur during assembly due to the upper and lower deviation of the casing Hogging deformation, it was confirmed that Hogging deformation is a major influencing factor on casing alignment.
4,000원
25.
2026.06
구독 인증기관 무료, 개인회원 유료
이우람
Advanced Air Mobility (AAM) systems rely on high-frequency operations of electric vertical take-off and landing (eVTOL) aircraft, making the performance of ground energy infrastructure a critical factor for overall system efficiency and reliability. In particular, battery swapping stations function as service systems in which multiple aircraft arrivals share limited resources, inevitably leading to processing delays under stochastic demand conditions. Previous studies have primarily focused on optimization-based scheduling and simulation-driven performance evaluation. However, the probabilistic mechanisms governing delay generation and operational stability in battery swapping systems have not been sufficiently explored. This study presents a probabilistic operational analysis of battery swapping stations in AAM using queueing theory. The system is modeled as a multi-server queueing system with stochastic arrival and service processes, and key performance metrics—including system utilization, average waiting time, and delay probability are analytically derived. Furthermore, delay behavior is examined not only in terms of average values but also through probabilistic distributions and service-level-based performance criteria. To validate the proposed analytical framework, MATLAB-based discrete-event simulations are conducted under various operational scenarios, including different arrival rates and service time variability conditions. The results indicate that stochastic characteristics significantly influence delay behavior and system stability, particularly under peak demand conditions. The proposed approach provides a theoretical foundation for understanding delay dynamics in AAM battery swapping operations and offers practical insights for designing stable and efficient ground infrastructure systems.
4,000원
26.
2026.06
구독 인증기관 무료, 개인회원 유료
이우람
Advanced Air Mobility (AAM) systems require efficient ground infrastructures to support high-frequency operations, where battery swapping stations play a critical role. In such environments, energy supply stability significantly affects system performance, particularly under time-varying demand. This study analyzes the impact of different energy supply configurations on battery swapping station performance using a simulation-based approach. Three configurations are considered: external power grid, distributed energy resources (DER), and integrated DER with energy storage systems (ESS). Key performance metrics include average waiting time, system staying time, task completion rate, and battery availability. The results show that grid-based systems experience increased delays under peak demand, while DER-only configurations improve some performance indicators, but their effectiveness remains limited under highly time varying demand due to supply variability. In contrast, the integration of DER and ESS achieves the most stable performance by mitigating energy fluctuations. These findings indicate that the temporal adaptability of energy supply is a critical factor in determining operational performance, highlighting the importance of integrating energy storage systems in AAM infrastructure design.
4,000원
27.
2026.06
구독 인증기관 무료, 개인회원 유료
이동식, 이중봉
This study investigated how task conflict and relationship conflict, which may occur during crewed operations among naval aviation pilots, affect their job performance, and sought to determine how individual pilots' cultural values influence the relationships between these conflicts. The results showed that task conflict has a statistically significant positive effect on relationship conflict. Regarding the moderating effect of individual cultural values on the relationship between task conflict and relationship conflict, power distance did not show a statistically significant moderating effect, while collectivism showed a statistically significant moderating effect on the relationship between task conflict and relationship conflict. The practical implications and additional tasks of this study are as follows: First, this study examined the relationship between task conflict-cognitive conflict among members—and relational conflict—emotional conflict at the individual level of military pilots-by applying this concept to the field of military aviation. Second, it implies the need for further follow-up research regarding the fact that an increase in cognitive conflict experienced by military pilots during flight duties leads to an increase in emotional conflict, suggesting that personal cultural values may have an influence. Third, this study applied only some sub-variables of personal cultural values to the relationship between task conflict and relational conflict. However, subsequent research should examine the relationships involving various moderating variables as well.
4,000원
28.
2026.06
구독 인증기관 무료, 개인회원 유료
이태근, 송규정
In this study, the noise reduction effect was investigated by predicting the transmission loss by changing the structure of the soundproof wall to maximize the noise reduction effect. Through the combination of commercially available sound insulation plate materials, it was possible to derive a combination with a high transmission loss for each frequency band. In order to effectively reduce soundproof walls for road traffic noise with various sound sources, it is judged that a method of improving transmission loss by investigating the frequency band of interest and changing the structure of the soundproof wall accordingly is necessary.
4,000원
29.
2026.06
구독 인증기관 무료, 개인회원 유료
우수성, 신원종, 김지선
In material extrusion additive manufacturing, extrusion throughput and bead shape are key factors affecting deposition quality and productivity. This study investigated the effects of melt index (MI) and glass fiber (GF) reinforcement on the extrusion behavior of HDPE-based materials. Three neat HDPE materials and two HDPE+GF composites with different MI values were extruded under identical conditions, and their extrusion throughput, bead thickness, and shape stability were evaluated. The results showed that the average extrusion throughput increased with increasing MI, whereas bead thickness decreased. The HDPE+GF composites exhibited better shape stability than neat HDPE; however, brittle fracture behavior was observed under bending deformation. These findings suggest that the extrusion throughput, bead shape, and shape stability of HDPE-based materials should be evaluated in advance according to MI and GF reinforcement before applying them to material extrusion additive manufacturing.
4,000원
30.
2026.06
구독 인증기관 무료, 개인회원 유료
김세준
This study develops a real-time ground coordinate acquisition system using a Laser Range Finder (LRF) mounted on an Unmanned Aerial Vehicle (UAV). To meet the requirements for precision and rapid response in surveillance, search and rescue, and disaster management, we implemented an integrated system comprising UAV hardware, coordinate calculation software, and a Ground Control Station (GCS) user interface. The system computes target locations in real-time by fusing sensor data from the LRF and UAV telemetry. Experimental results demonstrate that the proposed system maintains consistent coordinate accuracy within approximately 1.6m (mean) under static target conditions, across flight altitude variations of 10–50m and horizontal distance variations of 5–15m. This technology is expected to expand the operational scope of UAVs in both civilian and military sectors and enhance the technical competitiveness of domestic UAV-based positioning systems.
4,000원
31.
2026.06
구독 인증기관 무료, 개인회원 유료
이정익
The chain conveyor system is a product for the environment and productivity, allowing users to work efficiently. The existing chain conveyor system is operated by a single drive motor, so all processes are driven at the same time, so if the working hours are different, they are not time-efficient. Due to the nature of the chain conveyor system, a lubricant is used to prevent noise and dust caused by chain driving, and even if only one section of the chain conveyor breaks down, the entire line must be stopped in order to repair it. This study was conducted with a focus on localizing the flexible drive system, securing the reliability of the drive wheel that operates smoothly even in fatigue situations, prototyping and performance evaluation of the flexible drive system.
3,000원
32.
2026.06
구독 인증기관 무료, 개인회원 유료
민경재, 송준혁
The viscosity-temperature behavior of epoxy resins directly affects mold filling, fiber impregnation, and process stability in composite manufacturing. In this study, five commercial epoxy resin systems were evaluated using viscosity-temperature data measured in the range of 16 to 50 ℃, and two statistical sensitivity indices, S_T and S_RA, were defined and compared. The S_T index was defined as the logarithmic viscosity change rate in the range of 20 to 40 ℃, while S_RA was defined as the relative viscosity change between 3 wt.% and 6 wt.% internal release agent conditions at the same temperature. The results showed that high-viscosity resin systems were more sensitive to temperature than low-viscosity systems, and the influence of release-agent content varied among resin systems, especially in the processing temperature range. These findings provide useful baseline data for resin selection, temperature setting, and internal release-agent optimization in composite molding processes.
3,000원
33.
2026.06
구독 인증기관 무료, 개인회원 유료
장일도, 이명군, 이지윤
The domestic 1-ton truck market in Korea is rapidly shifting from diesel vehicles to LPG and electrified vehicles. However, hydraulic special-purpose vehicles, such as aerial work platforms, still require a reliable power take-off system to drive hydraulic equipment. In particular, conventional transmission-mounted PTO systems are difficult to apply to 1-ton LPG automatic-transmission trucks, despite the high market demand for automatic-transmission vehicles. In this study, a PTO system was developed for an aerial work platform based on a 1-ton LPG automatic-transmission truck. The developed system indirectly extracts engine power and transmits it to a hydraulic pump through a magnetic clutch. The hydraulic system was designed based on a flow rate of 20 L/min and a maximum pressure of 200 bar. The generated hydraulic power and required transmission torque were calculated using measured flow rate, pressure, and engine speed. The calculated pump input torque was confirmed to be within the allowable torque capacity of the 15 kgf·m magnetic clutch. The developed PTO-driven hydraulic system was applied to an actual aerial work platform, and the main working motions were confirmed to operate normally.
4,000원
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