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Heat exchanger is widely used in the vehicle cooling system and its performance influences the vehicle dynamic performance significantly. In present paper, an object-oriented louver fin-and-tube heat exchanger model was developed to simulate the dynamic outlet temperature of air and coolant. A two-dimensional discrete strategy, which divided the heat exchanger into macro control volumes on both air...
Lateral control of autonomous vehicle is investigated. The vehicle lateral dynamics is described with the previously researched state space model in terms of position and orientation error with respect to the road, and approximated by a Tanagi-Sugeno (T-S) fuzzy model with time-varying parameters. The system is stabilized by an optimal fuzzy state feedback compensator based on the parallel distributed...
Tire model for vehicle braking performance simulation analysis has been built in this paper. Through theoritical analysis, the expression of longitudinal force, side-force and self-aligning torque of the tire in joint working conditions was obtained. By means of neural network module in MATLAB, BP neural network model of the tire in joint working conditions was built. Vertical load, slipping ratio,...
To design reliably the products transportation simulation experiment system based on multi-body dynamics theory, vibration theory and virtual prototyping, the transportation vehicle subsystem simulation models such as fore and rear suspension, tire, vehicle body and steering are built and the whole vehicle virtual model is assembled, through the application of multi-body dynamics software (ADAMS)...
Montmorillonite (MMT) is a typical layered silicate. It has been widely used to modify polymers. In recent years, layered silicate has been receiving more attention from researchers in the civil engineering field, especially the organic nano-montmorillonite (OMMT). Flexible pavement plays an important role in structures of the primary highway at present. With the development of road traffic, asphalt...
In this article, Sanjiang Bridge was taken as a researched object of forced vibration test which includes running vehicle test, brake test and jumping vehicle test for its main bridge and approach bridge to obtain the time history curves and amplitudes. Through the analysis on the measured data, it's acquired that the forced vibration influences on the whole bridge structure in order to provide the...
The vehicle-bridge coupled equations of multiple vehicles parallel are established by combining the equations of motion of both the bridge and the vehicle using the displacement relationship and the interaction force relationship at the contact point. The equation can be solved by the Runge-Kutta method in time domain, and a MATLAB program of bridge dynamic analysis is developed to assemble the motion...
On the basis of relation between driver's decision when vehicle-cross action is done in the unsignalized intersection, the driver's decision on minor time and space scale is analyzed, and the expression for safety factors and speed factors for traffic conflict vehicles in the unsignalized intersection is put up, then the utility function for vehicle-cross action is put up too. With these work, the...
Road accident hotspots Identification is important in road safety improvement project, especially in aspect of effective funds allotment. This paper presents a simple methodology called dynamic step filtration method to study the spatial patterns of accidents in a highway or a highway network. The dynamic step filtration analysis is improved from average and steady step filtration method, basing on...
The sound absorption materials are more and more widely used in vehicles. An novel optimal design method is proposed in this paper, which mainly includes two steps: (i) the determination of expected absorbing curve based on noise reduction goal and noise rating curve; (ii) choice of absorption materials and optimization of the material thickness based on the sound absorption model. The method has...
This paper investigates the longitudinal vibration behavior of the deck of a floating-type cable-stayed bridge that is subjected to train braking and axle-loads of moving trains. A dynamic model for train braking and axle-loads of moving trains has been established based on the vehicle dynamics. The longitudinal forces induced by train braking and axle-loads of moving trains have been obtained. Meanwhile...
Bridge ambient vibration test has an advantage of being simple, fast and cheap. In this paper, we take the example of Linjiangmen Bridge which is located in Jilin City, Jilin province. The dynamic test research on the characteristics of the natural vibration for the bridge is discussed. The authors calculate the characteristics of the natural vibration for the bridge with the structure analysis software-ANSYS,...
The data processing in Weigh-In-Motion(WIM) is much more complicated, especially in data calibration of the system, because of complicated external environment. In this paper, we proposed a novel calibration approach for vehicle weigh-in motion system, based on a recurrent network, Elman network. Aiming at this complexity, a recurrent network-Elman network was applied to implement data fusion of the...
The special passenger railway from Wuhan to Guangzhou is the longest special passenger railway in China, and also with the features of the highest technical standards and the largest investment scales. The station adopted the structural form of combination of bridge and building, which is difficult to analyze its dynamic behavior and structural stability. Numerical calculation model for moving loads...
The bench tests of damping force controllability, response characteristic in time and frequency domain have been done for a special magneto-rheological (MR) damper. A dynamic model of quarter vehicle semi-active suspension system has been established. For improving the performance of traditional fuzzy controller (TFC) on the MR suspension, a grey predictive-fuzzy controller (GPFC) is proposed based...
The paper showed a design project of integrated testing equipment of Electro-hydraulic Proportional Direction Valve, the project aims to test the steady state and dynamic state performance of the electro-hydraulic proportional directional valve and the valve's position control accuracy and its dynamic response.
The New-style monitor for vehicle acceleration performance with P89C61X2BN single chip computer as core control and accelerometer ADXL202 as main detector is introduced. This instrument has no mechanical and electrical connection with motor vehicle, using collection and operation of acceleration data to realize the detecting function. Meanwhile, these data can wirelessly be transmitted to the host...
The objective of the study is to find out a kind of suitable way of establishing load spectrum on durability test of the car hub bearing. On the basis of establishing the car dynamic model, the paper analyzed the load situation of the Hub bearing. According to the ordinary transport status of the actual car, the driving cycle of the car was set up. In the end, the steps of establishing load spectrum...
During the process of simulating to the parameterized dynamic model built by using the ADAMS/Engine, the method of script simulating is used to control the shifting process by compiling the script document. The script simulating method is explored. By analyzing the simulating result of the system's transmission and shifting process the VP model is validated. Making good use of the feature of ADAMS...
A new automotive active steering actuator is introduced in this paper. The new actuator with the mechanical link between the steering wheel and the front steering gear is primarily comprised of a double planetary gear and an electric actuator motor and a worm transmission. The advantages of small volume and high supporting capacity were shown in the study. Compared with the BMW's actuator, the volume...
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