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During the launching of the AUV especially in air-launching, the water entry problem is inevitable. The AUV will stir the flow field of surrounding fluid during the moving into water, while the fluid will act a strong force on the AUV in return, which may cause trajectory deflection problems or damage to their structure and inner components in severe cases. The water entry experiment of full-size...
This paper develops a linear parameter varying(LPV) based robust model predictive control(MPC) method for a multi-vectored airship, the speed of the forward flight channel is considered. The nonlinear model of the airship is introduced with kinematics and dynamics. Then, in order to obtain the LPV models, the small perturbation linearization method is used. After that, the higher order singular value...
As the air bearing flying height (a few nanometer levels) and the deformation of suspensions (micro-or millimeter level) run at two different scales, a dual-scale model for head disk interface (HDIs) has been proposed to analyze the unloading behavior of a subambient pressure slider. With the scheme developed, the unloading process can be simulated efficiently. The nonlinear vibrations of the air...
In this paper we propose an approach for the determination of static force characteristic of a plunger-type AC electromagnet using 2D numerical model developed in QuickField software. The attraction electromagnetic force is calculated using Maxwell stress tensor method. The numerical model is an AC magnetics problem coupled with the coil electric circuit. The numerical model has been experimentally...
This article is concerned with parameters identification problems and computer modeling of thrust generation subsystem for small unmanned aerial vehicles (UAV) quadrotor type. In this paper approach for computer model generation of dynamic process of thrust generation subsystem that consists of fixed pitch propeller, EC motor and power amplifier, is considered. Due to the fact that obtainment of aerodynamic...
Considering the Insect-like flapping-wing micro aerial vehicle, this paper has analyzed the composite of quasi-steady aerodynamics. That process has associated with the affection due to addition quality produced by wake capture. With introducing rotate circulation. This paper has calculated the lift, drag force, and pitch torque which take part on the wings' surfaces. Ignoring the wings' quality,...
This article shows development of a fixed wing Unmanned Aerial Vechicle (UAV) prototype with multi rotor control system. This model pretends increase flight time of multi rotor system using aerodynamic characteristics. The lift force generated by a wing reduce the required power of the motors to raise up the structure during horizontal forward flight. For airfoil selection and sizing of the wing,...
The in-wheel motor electric vehicle (IWM-EV) is an overwhelming tendency in modern automobile due to its unmatched advantages. However, the new structure of IWM-EV which packets driving motor in wheel will induce the new problems, e.g. motor unbalanced radial force and airgap deformation of driving motor, etc. For the IWM-EV performance, these new problem is one of the major concerns. Taken switched...
This paper proposes a new method for tracking the whole trajectory of a ballistic missile from launch to impact on the ground. Multiple state models are applied for the ballistic missile movement descriptions during different phases, while the transition probabilities are modelled in a state-dependent way. A radar sensor is applied to obtain the missile range, azimuth angle and elevation angle measurements...
This paper deals with the electromagnetic, mechanical, and cooling solutions for an innovative direct-drive suited for steering gears on board ships. The work is comprised in a research project funded by the Italian Navy. The research aims to realize a full-electric and oil-free drive for actuation of hydraulic loads in the perspective of “more green ships”. The electrical drive proposed is based...
This paper investigates methods of magnet mass reduction in linear flux switching permanent magnet (LFSPM) machines by introducing tapered consequent poles. Based on the finite element analysis (FEA) three different models are designed, investigated and compared. The obtained results indicate that by adopting the proposed tapered ferromagnetic poles a considerable saving of material cost and weight...
The vibrational characteristics of the mid-infrared solid-state laser is an important factor which affects the laser output characteristic and the system integrated performance. Starting with the dynamic equilibrium equation, The simulation models of the vibrating effect of the solid-state laser and the key components are established, and the natural characteristics and dynamic response of the solid-state...
A reconfiguration method using model-based control allocation scheme is proposed in this paper. A reconfigurable closed-loop control system is established for control of a UAV (unmanned aerial vehicle) fixed wing aircraft in autonomous flight in case of single and multiple control surfaces failures. The control allocation is determined by using of a nonlinear dynamic model of a UAV aircraft. The model...
In this work we propose a framework for data-driven crowd simulation starting from a small set of trajectories. To model the macroscopic behavior, our method extracts pedestrian trajectories from real videos, clusters all trajectories of pedestrians who intend to reach the same goal, and computes the velocity field associated with each exit region in the scene to guide virtual agents toward their...
In this paper, a nonlinear control approach is presented for an electro-pneumatic clutch actuator for heavy trucks. A clutch is required at start-up or during gear shifts to disconnect the combustion engine from the gear box. This automated actuator provides the necessary actuation force according to the large torque transmitted through the power train. Based on a control-oriented system representation,...
Electromagnetic catapult launch tends to be equipped on future carrier deck gradually. This paper aims to establish the mathematical representation of the system of electromagnetic aircraft launch considering aspects of carrier, aircraft and electromagnetic catapult. The proposed catapult system is evaluated by conducted simulation considering disturbance of deck wind and ground effect during stroke...
In this paper, we present the application of radial basis function (RBF) neural network for aerodynamic parameter estimation. The Two-Stage RBF neural network (NN) architecture is proposed for complete aerodynamic modelling. The RBF NN is trained by hybrid learning using K-means clustering and recursive least squares (RLS) methods. The proposed architecture yields the significant improvements for...
Half-Rotating Wing (HRW) is a new type of analogous flapping wing system with rotating flapping used as a substitute for oscillating flapping. Estimating method of flight lift generated by HRW was one of the significant theoretical basis to design air vehicle. The working principle of HRW based on Half-Rotating Mechanism (HRM) together with the spanwise airflow and chordwise airflow generated during...
The establishment of flight control system parameters modeling and fault simulation is the basis of fault diagnosis. In this paper, the flight control system simulation model is established by MATLAB / SIMULINK. We describe the modules and implementation methods of the flight control system parameters modeling in detail. In addition, the simulation of the failure mode and realization is introduced...
Single engine failure is a typical asymmetric problem for twin-engine carrier-based aircraft, which induces rolling and yawing divergence and aggravates takeoff performance during catapult launch. Multi-agents dynamics model integrated with aircraft, carrier and sea level atmosphere is established for the analysis of departure characteristics. Numerical simulation results reveal that lateral-directional...
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