Autonomous landing is a fundamental aspect of drone operations which being focused upon by the industry, with ever-increasing demands on safety. As drones are likely to become indispensable vehicles in near future, they expected succeed automatically recognizing spot from nearby points, maneuvering toward it, and ultimately, performing safe landing. Accordingly, this paper investigates idea vis...

Commercial aircraft are designed to fly but also need to operate safely and efficiently as vehicles on the ground. During taxiing, take-off, and landing the landing gear must operate reliably over a wide range of forward velocities and vertical loads. Specifically, it must maintain straight rolling under a wide variety of operating conditions. It is well known, however, that under certain condi...

The Hudson River emergency landing of US Airways Flight 1549 inspired aviation enthusiasts and citizens alike. The pilot's skill and composure were exceptional, clearly contributing to one of the most successful aircraft water ditchings possible. As we prepare for transition to a next-generation air transportation system, we are developing new technologies both to increase system capacity and e...

This letter presents a strategy for control of spacecraft docking with non-maneuvering target in the presence safety constraints and bounded disturbances. The disturbances prevents convergence to unique state, so our formulation, is defined as occurring within set constructed using prescribed tolerances. Safety ensured via application Robust Control Barrier Functions render designated safe forw...

PURPOSE About 70% injury of gymnasts happened during landing - an interaction between gymnast and landing mat. The most injured joint is the ankle. The current study examined the effect of mechanical properties of landing mat on ankle loading with aims to identify means of decreasing the risk of ankle injury. METHOD Gymnastic skill - salto backward stretched with 3/2 twist was captured by two...

This paper explores the use of millimeter-wave (MMW) scanning radar for control and safeguarding during spacecraft descent and landing. The essay compares radar characteristics such as beam width, agility and range accuracy, against sensing requirements for a specific descent and landing scenario. While the study discussed here presents the advantages of agile motion-free scanning radar for map...

As part of the physical education program at the United States Military Academy, all cadets complete a movement training course designed to develop skills and improve performance in military-related physical tasks as well as obstacle navigation. The purpose of this study was to determine if completion of this course would also result in changes in jump-landing technique that reduce the risk of ...

There is considerable evidence to support a number of biomechanical risk factors associated with non-contact anterior cruciate ligament (ACL) injury. This paper aims to review these biomechanical risk factors and highlight future directions relating to them. Current perspectives investigating trunk position and relationships between strength, muscle activity and biomechanics during landing/cutt...

This study investigated how changes in the material properties of a landing mat could minimise ground reaction forces (GRF) and internal loading on a gymnast during landing. A multi-layer model of a gymnastics competition landing mat and a subject-specific seven-link wobbling mass model of a gymnast were developed to address this aim. Landing mat properties (stiffness and damping) were optimise...