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Fatigue Experiment and Failure Mechanism Analysis of Aircraft Titanium Alloy Wing-Body Connection Joint.
Sensors (Basel)
December 2024
Department of Industrial Engineering and Management, Shanghai Jiao Tong University, Shanghai 200240, China.
Taking the titanium alloy wing-body connection joint at the rear beam of a certain type of aircraft as the research object, this study analyzed the failure mechanism and verified the structural safety of the wing-body connection joint under actual flight loads. Firstly, this study verified the validity of the loading system and the measuring system in the test system through the pre-test, and the repeatability of the test was analyzed for error to ensure the accuracy of the experimental data. Then, the test piece was subjected to 400,000 random load tests of flight takeoffs and landings, 100,000 Class A load tests, and ground-air-ground load tests, and the test piece fractured under the ground-air-ground load tests.
View Article and Find Full Text PDFInfluence of phase and dominance on ground reaction forces and upper extremity muscle activity during the modified-Closed Kinetic Chain Upper Extremity Stability Test.
BMC Sports Sci Med Rehabil
January 2025
Universite Lyon 1, Laboratoire Interuniversitaire de Biologie de la Motricité - UR 7424, UFRSTAPS, Villeurbanne, France.
Background: The Closed Kinetic Chain Upper Extremity Stability Test (CKCUEST) is a physical performance test designed to assess the upper extremity (UE) stability. However, only one outcome measure is provided for both UEs, limiting its application if the UEs are not similarly involved. Moreover, the changes in loads sustained by the support UE throughout the movement may influence the support UE stability.
View Article and Find Full Text PDFAerodynamic analysis of complex flapping motions based on free-flight biological data.
Bioinspir Biomim
January 2025
School of Mechatronical Engineering, Beijing Institute of Technology, 5 South Zhonghuancun, Haidian District, Beijing 100081, Beijing, 100081, CHINA.
The wings of birds contain complex morphing mechanisms that enable them to perform remarkable aerial maneuvers. Wing morphing is often described using five wingbeat motion parameters: flapping, bending, folding, sweeping, and twisting. However, owing to a lack of real bird flight data, in-depth studies on the aerodynamic properties of these coupled motions remain scarce.
View Article and Find Full Text PDFDevelopment and challenges of autonomous electric vertical take-off and landing aircraft.
Heliyon
January 2025
Swansea University, Swansea, Wales, SA2 8PP, UK.
Urban Air Transportation (UAT) encompasses private aircraft, air taxis, and specialized missions. These missions include aerial sightseeing, logistics transportation, emergency response, and anti-terrorism operations. They impose stringent requirements on advanced air mobility (AAM) aircraft.
View Article and Find Full Text PDFComparison of Vertical Jump Force-Time Metrics Between ACL-Injured and Healthy Semi-Professional Male and Female Soccer Players.
Sports (Basel)
December 2024
Research Center for Sport and Health Sciences, University of Iceland, 102 Reykjavik, Iceland.
Given the increasing use of innovative force plate systems in applied sports settings and the impact that anterior cruciate ligament (ACL) injuries have on team success, the purpose of the present study was to compare the lower-body neuromuscular performance characteristics of athletes who underwent ACL reconstruction (ACLR) and their non-injured counterparts (i.e., healthy controls).
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