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The testing bench was developed to test Integrative Performance of hydraulic retarder and dynamic united adjustment was used in it. Simulated loading and oil temperature stability control of the test bench were studied. In order to achieve a joint dynamic load simulation, vehicle acceleration resistance was simulated by inertial flywheels and adjustable resistance was simulated by AC electrical dynamometer...
As the near space atmospheric environment is complicated and variational, aircraft electric propulsion system parameters and load characteristics of the propeller will be changed, if the control method of electric propulsion system shall not be treated, the system stability and reliability will be affected. A novel double close loops control method with current and speed was presented in this paper,...
The paper presents a Vehicle Dynamics Control (VDC) strategy devoted to prevent vehicles from spinning and drifting out, which plans out the optimal wheel slip ratio based on Linear Quadratic Regulator (LQR) theory and liner 2-DOF dual model, and establishes the wheel slip controller by application of sliding mode control theory. Compared with conventional PID control, the optimal sliding mode control...
A 2DOF reference model of heavy single tractor was set up using the yaw rate and the lateral acceleration as control variables based on analysis of tractor instability mechanism. The reference model of tractor was simulation controlled using allocation strategy of braking moment and control strategy of slip ratio with PD algorithm for typical fishhook steering in Trucksim. The simulation results show...
The possibility of regenerative braking is one inherent advantage of hybrid electric vehicle. The motor and the hydraulic braking system are braking together while the hybrid electric vehicle is braking. But, the difference of the braking force dynamic response between the motor and the hydraulic braking system will lead the inadequate or excessive braking and will affect the braking feeling of the...
Nonlinear dynamics theory and bifurcation theory were adopted to study stability and bifurcation phenomenon of supercavitating vehicles. With least-squares method, simplified dynamics models for longitude of supercavitating vehicle were obtained. Using multiple scale perturbation techniques, the nonlinear differential equations for longitude motion of supercavitating vehicle were solved, the stability...
In this paper, a new cooperative control system is proposed for the vehicle's steering antilock braking stability fields. The cooperative control architecture is composed with the steering controller and the braking controller. Based on the yaw moment and the front wheel angle controllers, the vehicle steering controller was designed to improve the respond and stability of the vehicle. Besides, the...
This paper presents a nonsingular terminal sliding mode control using fuzzy wavelet networks for trajectory tracking and stabilization of a Mecanum wheeled omnidirectional vehicle (MWOV). A dynamic model of the vehicle including static friction is constructed; on the basis of the model, a nonsingular terminal sliding mode control is proposed to achieve trajectory tracking and stabilization. Fuzzy...
There are strong dynamic coupling effects exist between vehicles lateral and longitudinal motion, especially in lane changing process. It is difficult to get ideal control effect by lateral and longitudinal control separately. Thus, to realize a smooth and safety lane changing process the nonlinear lateral and longitudinal coupling vehicle model was established. According to sliding mode control and...
At very high speeds, the surfaces of underwater vehicle are enveloped by cavity entirely or mostly. Due to the existence of interactions between tail of body and cavity wall, supercavitating vehicle model is highly nonlinear. This paper applies dynamic inverse control as control inner-loop, and mathematical model of vehicle longitudinal motion is nonlinear decoupled through using dynamic inverse control...
The hovering control of a helicopter simulator is studied with fuzzy logic enhanced sliding mode scheme in this paper. The mathematical model of the simulator is analysed and established on aerodynamics, the perfect control is introduced to the sliding mode control and the fuzzy rule base of the designed fuzzy system is established under the principle of Lyapunov's stability theorem. The simulation...
Based on the analyzing means of Lagrange Dynamics, this thesis derived the motion equation of inverted pendulum as well as the control equation of rotary-arm. After dealing with the system through approximation, the author analyzed the data and simplified energy control rule that was easy to realize was worked out. The angle of rotation, the rate of change as well as the swing trend of inverted pendulum...
This paper presents a novel mobile vehicle navigation algorithm based on the stability analysis of the model predictive control approach. The energy-shaping technique is performed with the navigation function to obtain a new virtual vehicle model that generates candidate feasible trajectories for the motion planner. Stability of the nonlinear model predictive control system is obtained by the passivity...
This paper presents an adaptive PD control scheme for multiple autonomous underwater vehicles (AUVs). The proposed adaptive PD controller with uncertain gravitational and buoyancy forces requires only model of gravity and buoyancy regressor matrix and does not need any knowledge of inertia matrix, Coriolis and centripetal force, hydrodynamic damping and the parameters of the gravity and buoyancy forces...
This paper discusse four new Takagi-Sugeno fuzzy controllers (T-S FCs) for the longitudinal slip control of an Antilock Braking System laboratory equipment. Two discrete-time dynamic Takagi-Sugeno fuzzy models of the controlled plant are derived based on the parameters in the consequents of the rules using the domains of the input variables, and doing the local linearization of the plant model. The...
The non-standard dynamics characteristics of hypersonic vehicles, the aerodynamic effects together with the wide range of speed and altitude during operation make modeling and control of these vehicles highly challenging. Modeling and analysis of hypersonic vehicles are important for control and navigation system design. A six degrees of freedom simulation model of the wing cone generic hypersonic...
A new concept of control accelerated motion of supercavitating vehicle is present. Before reaching a constant cruising speed of 100 m/s supercavitating vehicle is process of accelerated motion. In order to explore dynamic model and control challenges associated with the longitudinal accelerated motion of supercavitating vehicles, memory effect of the cavity and its influence on shape of cavity are...
A sliding mode controller is designed for the longitudinal dynamics of a generic hypersonic vehicle. A generic nonlinear longitudinal dynamics model for wedge-shaped vehicle is used. Based on the dynamic inverse control, the sliding mode is adopted with the reaching law that contains a linear-quadratic controller. Optimal control techniques can be applied to search the parameters of linear-quadratic...
This paper addresses the design of flight control system related to neural network-based adaptive dynamic surface control for the longitudinal motion of an airbreathing hypersonic vehicle. The control objective is to provide adaptive velocity and altitude tracking in the presence of the model uncertainties and unknown nonlinearities caused by changes of flight conditions. By approximating the unknown...
An attitude regulating control for a class of satellites is proposed. The control scheme is based on the orientation description of Rodrigues or Modified Rodrigues parameters. A method for initial value calculation of the Rodrigues/Modified Rodrigues parameters is given to transmit the stabilizing control into regulation. An attitude control for SAPPHIER satellite is studied. The proposed control...
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