Results 31 to 40 of about 165,973 (305)

Dynamics models of flexible aircraft [PDF]

, 2019
Recent trends in aircraft design owing to requirements of high performance and weight reduction have resulted in aircraft possessing significant structural flexibility. Under these conditions, flight vehicles become vulnerable to unfavourable interactions between the structural dynamics of flexible components, aerodynamics and the overall motion of the
openaire   +2 more sources

Multi-Objective ADRC-Based Aircraft Gust Load Control

Applied Sciences
In this paper, we propose a dual-loop Active Disturbance Rejection Control (ADRC) strategy for gust load alleviation in flexible aircraft. By decoupling the control of modal and normal accelerations and spatially allocating control surfaces, the method ...
Chengxiang Li, Zheng Gong, Yalei Bai, Sikai Guo, Longbin Zhang   +4 more
doaj   +1 more source

Experimental and Numerical Study on the Performance of Double Membrane Wing for Long-Endurance Low-Speed Aircraft

Applied Sciences, 2022
Flexible membrane structure is generally used as wing skin for long-endurance low-speed aircraft, such as solar aircraft, to control the structure weight within the allowable range. Predictably, the elastic deformation of the membrane under complex loads
Liang Zhang, Dongli Ma, Muqing Yang, Yuan Yao, Yayun Yu, Xiaopeng Yang   +5 more
doaj   +1 more source

Automation tools for flexible aircraft maintenance. [PDF]

, 2003
This report summarizes the accomplishments of the Laboratory Directed Research and Development (LDRD) project 26546 at Sandia, during the period FY01 through FY03. The project team visited four DoD depots that support extensive aircraft maintenance in order to understand critical needs for automation, and to identify maintenance processes for potential
Prentice, William J., Drotning, William D., Watterberg, Peter A., Loucks, Clifford S., Kozlowski, David M.   +4 more
openaire   +2 more sources

A Comparative Study on Early‐Stage Icing Evaluation Techniques for Passive Ice Protection Systems

Advanced Materials Interfaces, EarlyView.
This study addresses the lack of standardized methodologies for evaluating the early‐stage icing performance of passive ice protection systems. A unified experimental protocol is proposed and applied to representative hydrophilic and hydrophobic surfaces under controlled conditions.
Lorenzo Facco, Elena Colusso, Marco Tancon, Alessandro Martucci, Riccardo Parin   +4 more
wiley   +1 more source

Output Feedback Fuzzy Gain Scheduling for MIMO Systems Applied to Flexible Aircraft Control

Aerospace
Previous works by our group evidenced stability problems associated with flight control law design for flexible aircraft regarding gain scheduling.
Guilherme C. Barbosa, Flávio J. Silvestre   +1 more
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, EarlyView.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source

Flexible Manufacturing of Aircraft Engine Parts [PDF]

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, 1992
GE Aircraft Engines, a major supplier of jet engines for commercial and military aircraft, has developed a fully integrated manufacturing facility to produce aircraft engine components in flexible manufacturing cells. This paper discusses many aspects of the implementation including process technologies, material handling, software control system ...
Dssama M. Hassan, Douglas M. Jenkins
openaire   +1 more source

Study of Free‐Space Optical Quantum Network: Review and Prospectives

Advanced Science, EarlyView.
Free from the constraints of fiber connections, free‐space quantum network enables longer and more flexible quantum network connections. This review summarizes and comparatively analyzes free‐space quantum network experiments based on ground stations, satellites, and mobile platforms.
Hua‐Ying Liu, Zhenda Xie, Shining Zhu
wiley   +1 more source

Flexible aircraft flying and ride qualities [PDF]

, 1984
A brief analytic exposition is presented to illustrate a central principle in flexible mode control, some of the pertinent pilot centered requirements are listed and discussed.
Ashkenas, I. L., Magdaleno, R. E., Mcruer, D. T.   +2 more
core   +1 more source