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HDVs rollovers cost hundreds of million dollars every year, the risk of having dead people in accidents involving HDVs is multiplied by 2.4 in comparison to the same risk computed for accidents involving light vehicles. Wind has been shown to be an important factor that must be considered when investigating HDVs rollover. In order to address these concerns, this research built an aerodynamic and vehicle...
Estimation of tire-road friction forces has an important role in anti-lock brake systems (ABS), as well as for vehicle stability control systems, and road condition monitoring systems. We investigate the use of a moving horizon observer for estimation of multiple friction model parameters as well as the longitudinal wheel slip state under typical ABS braking scenarios, using wheel speed measurement...
In Steer Release condition, due to the ability of actual vehicle to resist external small perturbations and self-Adaptive coordination can't be described in the previous vehicle model, the stability of vehicle is described insufficiently. A fine steering system model was established, including Stick-slip friction model and a complete dynamic system consist of wheels, axles, steering tie rod and rack...
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,...
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...
Vehicle is a complex uncertain system with parameter perturbations and external disturbances; these uncertainties will easily result in the loss of vehicle driving stability. Tire cornering stiffness is a key influencing factor on maneuverability of vehicle. In order to maintain driving stability in vehicle cornering, through regarding tire cornering stiffness and outer disturbances as bounded uncertain...
The BTT flight control system design is researched and established for flight vehicle control mathematical model, control gain solution and mathematical simulation. Firstly, the design of BTT flight control system is put forward, and then a linear controller is designed with fuzzy control theory. Secondly, the flight vehicle's characteristic is analyzed, and the disturbance model is set up. The Frequency-domain...
Electric Power Steering (EPS) systems have many merits over traditional hydraulic power steering systems in fuel economy, variable assist capabilities and favorable road feeling by virtue of adjustment assist characteristic with adopting assist motor in replacement of hydraulic pump. This paper aims at modeling the mechanical parts, the assist motor and electronic control unit by bond graph technique...
This paper is about modeling and control of Miniature Aerial Vehicles -MAVs for indoor scenarios, specially using, micro coaxial and quadrotor systems. Mathematical models for simulation and control are introduced and subsequently applied to the commercial aircraft: the DraganFlyer quadrotor and the Micro-Mosquito coaxial flying vehicle. The MAVs have been hardware-modified in order to perform experimental...
To increase control precision and improve dynamic characteristic of continuously variable transmission control system, a method of processing data called optimal test that usually adopted in chemical experiment is applied. After parameters are ensured, the critical gain KV of the open-loop system is determined by the stability, then the factors are determined and the orthogonal table is constituted...
Based on the dynamics and kinematics of the relative motion between missile and target for missile guidance, under the assumptions that the target is stationary, and the velocity of missile is a constant, and according to the error between the real impact angle and the designated impact angle, the desired kinematics of LOS (line of sight) is analyzed and designed. Then, a three-dimensional guidance...
Based on the analysis of the steering performance, the objective of this paper is to present evidence for the tractor adopted the four-wheel steering (4WS) which can improve the handling and stability of tractor semi-trailer. The simplified single track model with 3 DOF for 4WS tractor semi-trailer has been constructed for dynamic simulation through time-domain response on the two states of small...
Automatic steering control has a direct impact on satisfaction of various vehicle performance requirements including obstacle avoidance, lane tracking accuracy, and passenger comfort. The presence of unknown vehicle dynamics in steering applications requires a robust control design potentially reducing the unexpected effects of uncertain driving conditions and minimizing vehicle path deviations in...
This study proposes an essential issue to construct a driver model for a railway in order to keep a safe and integral society throughout the world. As of now, no study has been made on the transfer function of train drivers and brake systems as to safety of a railway. This paper describes the stability and safety of railway vehicles controlled by train drivers. The driver model used the model as proposed...
Using multi-body dynamics technique, a full vehicle multi-body model for a SUV type is set up with ADAMS. A full vehicle handling stability is simulated and analyzed. A back suspension model which is able to describe its elastic deformation is established by the BEAM principle. According to three estimation methods of the open-loop model handling stability, a handling stability simulation is carried...
Research focusing on the vehicle stability control system has resulted in many strategies for active yaw control based on the anti-lock brake system and traction control system. The controller prototype is brought forward to control the vehicle under extreme steer maneuvers and with uncertain road. The linear models, including the linear four-wheel vehicle model, and the simplified tire model, the...
The structure of an autonomous underwater vehicle is introduced, its dynamic model is established and simulation result is presented. Its stable and reliable control system design is discussed in detail from main control unit, communication unit to motor driving unit. A double-server, warm-cold backup scheme is used to design the control system of the AUV in order to make it more tolerant and reliable,...
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