Dynamics Modeling and Simulation for Moving-mass Reentry Vehicle
With respect to hypersonic re-entry vehicle, by applying the Newton-Euler's method, the six-degrees of freedom(6-DOF) dynamical equations of moving mass for a re-entry vehicle are derived and the control mechanism is analyzed according to the dynamical equations. Under the environment of Matlab, the 6-DOF trajectory simulation is presented based on the dynamical equations considering the earth's rotation and non-spherosomes factors, the cross-range and down-range of the impact point cause by lateral movement of the moving masses are computed by simulation and the results validate the feasibility of moving mass control.
Modeling of Mars Entry Vehicles with an Internal Sole-moving-mass Actuator
This paper investigates the deployment of an internal sole-moving-mass actuator in Mars entry vehicles. Given the extreme environment of Mars atmosphere, moving mass control has gained plenty of advantages in efficiency, cost and reliability over aerodynamic flap and thruster-based control. First, a model of moving-mass dynamics is derived using Kane’s Method based on the proposed moving mass configuration. In such a multi-body system, the interactions between the moving mass and the vehicle are focused on during the modeling procedure. Then, several key parameters of the moving mass configuration are determined through analysis. Finally, the manipulation characteristics are verified to ensure the capability of mission accomplishment. Simulation results indicate the applicability and effectiveness of the proposed sole-moving-mass actuator.
Accurate measurements of output characteristics and detonations of motorbike high-speed racing engine and their optimization at actual atmospheric conditions and combusted mixture composition
Abstract At a motorbike high speed racing engine there is very important an output engine characteristics which depends significantly on a detonation combustion rate, atmospheric conditions and a combusted mixture composition. The combustion process has got a relevant influence on a wear degree of main engine parts or on their damage eventually. The detonation combustion rate is very important because this kind of burning can be not only destructive but a useful phenomenon, as well. If the process of detonation burning is kept on a certain level, it can help significantly to the next increasing of an engine power output. In this article there is described the measurements of output characteristics of a high-speed racing engine which were performed by means of a data-recording system and the detonation combustion was evaluated using a quantitative method. The actual values of atmospheric conditions and the mixture composition were added to the measured values. Then the obtained values are compared visually with a damage degree of an engine piston caused by the detonation burning. The result is a limit value expressed in a number of detonation units related to a run distance interval of the vehicle driven by the high-speed racing engine. In framework of this run distance interval there is the process of detonation burning profitable. As well as it increases an engine power output and together it is not destructive with regard to engine design parts.