A novel manner of one-legged bipedal locomotion (i.e., ballistic flip) is proposed in this paper. A flip is composed of three sequential stages: stance phase, flight phase and touchdown. During the stance phase, the two objectives of control, constant locomotive speed and taking off at the end of stance phase, are achieved via a control algorithm based on nonlinear feedback linearization. The f...

Interface dynamics of post contact states in regularized models of electrostatic-elastic interactions are analyzed. A canonical setting for our investigations is the field of MicroElectromechanical Systems (MEMS) in which flexible elastic structures may come into physical contact due to applied Coulomb forces. We study the dynamic features of a recently derived regularized model (A.E. Lindsay e...

This paper analyzes the effects of helicopter dynamics on pilots’ learning process and transfer learned skills during autorotation training. A quasi-transfer-of-training experiment was performed with 14 experienced pilots in a moving-base flight simulator. Two types dynamics, characterized by different autorotative index, were considered: “hard,” high pilot compensation required, “easy,” low re...

Abstract The runway and landing gear speed difference causes non-negligible friction at touchdown, generating vital heat to raise the tyre tread temperature. resulting material decomposition reduces thickness significantly impacts flight safety environment. Airline operators also need pay cost of frequent replacement. pre-rotation strategy has been proposed prevent high-speed touchdown. Therefo...

Abstract This research considers the descent path of a space vehicle, from periselenium its operational orbit to lunar surface. The trajectory is split in two arcs: (a) approach, up specified altitude, and (b) terminal soft touchdown. For phase (a), new locally flat near-optimal guidance used, which based on iterative projection spacecraft position velocity, availability closed-form expressions...

This paper proposes the creative idea that an unmanned fixed-wing aircraft should automatically adjust its 3D landing trajectory online to land on a given touchdown point, instead of following pre-designed fixed glide slope angle or path composed two waypoints. A is typical under-actuated and nonholonomic constrained system, procedure—which involves complex kinematic dynamic constraints—is chal...

Perhaps the most widely known nonlinear phenomena in nanoand microelectromechanical systems is the “pull-in” or “jump-to-contact” instability. In this instability, when applied voltages are increased beyond a certain critical voltage there is no longer a steady-state configuration of the device where mechanical members remain separate. This instability affects the design of many devices. It may...

Abstract Approach/Landing is the phase of most accidents occur to endanger civil aircraft safety. CAT III autoland operation can improve safety and reliability when approach landing in bad weather conditions, reduce pilot’s working loads, so control law design an important task advanced flight system research. However, related researches are requirement based rather scenario based. Firstly, art...

Idealized mathematical models of animals, with point-mass bodies and spring-like legs, have been used by researchers to study various aspects of terrestrial legged locomotion. Here, we fit a bipedal spring-mass model to the ground reaction forces of human running, a horse trotting, and a cockroach running. We find that, in all three cases, while the model captures center-of-mass motions and ver...