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First a seven DoF full vehicle model was adopted which takes into account the MR (Magnetorhelogical) damper. A Backstepping control method was presented in this study for the control of the semi-active suspension based on MR damper. And a Smith Predictor was used to compensate time delay of the semi-active suspension system. Then, to access the performance of the controller, both time and frequency...
A new robust disturbance rejection controller scheme integrating a main controller and a compensator for reusable launch vehicle reentry attitude control is proposed. The main controller, using nonlinear dynamic inversion technique, is designed for high performance of the nominal system. The compensator, based on nonlinear extended state observer, built an additional control signal to cancel the disturbance...
Though safety of the power supply has been paid close attention to, most of the urban rail transit failures at present result from the power failure. The paper, which focuses on the global control, proposes an emergency self-traction system with the purpose of wisely utilizing the power reserved in energy saving system for rational emergency self-traction when power supply breaks down. The strategy...
A new predictive guidance algorithm was presented for the long-range reentry vehicles to improve the real-time capability of the conventional predictive guidance. The equation of constraints in reentry flight was established. The bank angle curve of the reference trajectory was generated beforehand to supply the reference states for piecewise predictive guidance. The absolute value of the bank angle...
In this paper, a novel algorithm which optimally regulates the generator voltage was proposed. With this method, terminal voltage that applied on the battery was limited and optimized to an ideal range to save the electrical energy and protect the lead-acid battery from damages such as sharp charging pulse or over charging (discharging). This generator regulation model is implemented in Matlab/Simulink...
Based on the description of dynamic vehicle routing and scheduling problem (DVRP), a vehicle-dispatching system with variable travel times was designed using advanced information systems of intelligent transportation systems in urban areas. The system consists of offline dispatching module, online dispatching module, information module, data base, forecasted module mainly. In offline dispatching module,...
This paper proposes a on-line modeling and control approach through Takagi-Sugeno (T-S) fuzzy-neural model for a class of generalized multiple input multiple output (MIMO) nonlinear dynamic systems with external disturbances. Nonlinear systems are exactly formed a linearized system via the mean value theroem, and then the T-S fuzzy-neural model can approximate the linearized system. Then on-line identificatoin...
This paper is about authenticating the accident when vehicle goes off the mountain road. Fine calculation and computer simulation for the accident reason has been done on the base of related cases and vehicle dynamics theory. The “fall-down accident analyzing and simulating reconstruct system” has been built on the platform of VC++. The result from typical cases shows that the system takes an important...
New predictive guidance (NPG) algorithm is proposed and the fuzzy techniques are adopted to improve the real-time capability of the predictive guidance. The simplified kinematical and dynamical equations of model for the entry vehicle are established. The nominal bank angel profile is established beforehand to implement numerical prediction. The predictive errors are used as input of fuzzy logic controller...
Wind tunnel testing is the effective method to research high speed train aerodynamics. It is one of the key steps to ascertain the model scale for wind tunnel testing, because scaled model is always introduced into wind tunnel testing, due to the huge body. Based on the structure of aerodynamic and aero-acoustic wind tunnel, using computational fluid dynamics (CFD), focus on middle car of three connected...
A novel method for fast design of reentry drag profile for reusable launch vehicle (RLV) is developed. A reference drag profile as a function of velocity is designed as a two-segment piecewise line subjects to given initial conditions, path constraints, and terminal conditions. The secant method is utilized to search for the turning point of the profile rapidly until the gliding range and the terminal...
This article provides a new control strategy of parallel regenerative brake system based on the requirement of new energy vehicles, and optimizes the control strategy according to ECE regulations, so that vehicles can use the maximized regenerative braking capability on the premise of ECE regulations. We verify the feasibility and braking performance of the optimized control strategy in MATLAB/Simulink-AMESim...
An electro-hydraulic parallel brake scheme based on Anti-lock Braking System (ABS) is proposed. Taking advantage of the hydraulic control unit of ABS, the regenerative brake is preferentially adopted as far as possible on the premise of braking safety. Then, a detailed brake system model including ABS unit is built using the joint simulation technology of AMEsim and Matlab, the parallel brake control...
A two-DOF dynamic equation with cubic nonlinear stiffness was established. The response of the system to the four kinds of path spectrums which are cement road, washboard road, pebble road and fishscale pits road is obtained by Runge-Kutta method and the vertical vibration serviceability is obtained by simulation calculation. The curves of vibration serviceability-damping coefficient under the four...
This paper describes the basic situation of domestic and foreign refrigerating transportation. It analyses and compares the development of refrigerated truck and railway refrigerated lorry. Meanwhile, the paper probes into the some practical measures of refrigerated transport in the following aspects like, reforming refrigerated transportation organizations with the information technology, developing...
In order to solve the problem of real-time and accuracy for collecting the traction battery evaluation parameters, including battery voltage, battery current and battery temperature, the data acquisition system based on Field Programmable Gate Array(FPGA) and Universal Serial Bus Protocol (USB2.0) is designed. In this paper, FPGA is used as the microcontroller to control analog to digital(A/D) conversion...
Due to the limit of the static strength theory that result in that it can't reflect exactly the dynamic loads suffered by gear box of tracked vehicle, so it is difficult to analysis the reliability and rest life prediction with the short time and the complex task profile. In the paper, collaborative simulation based on interfaces is used in gear box of tracked vehicle. With the running simulation...
The paper introduce structured grid division, use CFD numerical simulation and FLUNET software to conduct the simulation calculation for flow field of high-speed vehicle, which study the clamps of high-speed vehicle control helms how to affect the lift-drag characteristics of it. To better illustrate the problem, we use the canard configuration vehicle that efficiency of control is higher. This paper...
For ensuring traffic safety requirements and meeting the development of current automobile industry, the paper presents the design against rear-end accident. The design would complete the intelligent control of brake system via using single-chip microcomputer (SCM) data processing ability, and combining the fuzzy control theory. Millimetre wave (MMW) radar is selected to measure the distance between...
This paper puts forward a new shadow defects segmentation method based on YCbCr color space. First, Mean Shift smoothing method is used to smooth the image pixels, and the motion area which includes the vehicle and the shadow defect is selected by binary discrete wavelet transforms after Mean Shift smoothing, and then the original data of the shadow defect according to the characteristics of the occurrence...
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