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The current vehicle dynamic stability control system is mostly concentrated on yaw stability and can not provide the adequate roll stability for vehicles with elevated center of gravity (CG). During critical steering, the variant vertical force of tire due to the roll motion may not only cause rollover accidents, but also affects yaw stability. This paper focuses on integrated control for vehicle...
In order to eliminate the static error, PI compensator was introduced to the classic two-loop autopilot and the contribution of PI was analyzed while the equivalent time constant estimates of two-loop autopilot with PI was discussed. Four different objective functions were introduced to the design procedures. It is concluded that it is the large gain at low frequency of PI solved the problem of static...
Morphing concepts for missiles have been a topic of current research interest in aerospace engineering. For the morphing wings technology of missile, a kind of autopilot design method is proposed by H∞ control theory. In order to have the better flight performance in the different regimes, the missile can automatically change the wings area symmetrically. The nonlinear dynamic model is established,...
In order to meet the requirements of lateral velocity (vy) and longitudinal velocity (vx) in vehicle active safety control systems, and to modify the impact of noise change on the estimation accuracy, a novel method based on Adaptive Kalman Filter (AKF) is proposed for estimation of vy and vx in this paper by updating the mean and covariance of noise online. This method is evaluated under a variety...
A new optimal guidance algorithm for aeroassisted orbital transfer of reentry vehicle is presented. The complex aeroassisted orbital transfer guidance problem is translated into a trajectory optimization problem which is solved with optimal control theory. Based on the simplified dynamic equations, the Hamilton function and adjoint state equation for optimization is built. Sequentially, the problem...
Semantic video analysis and retrieval is an important way to deal with massive video data. To solve the shortcomings of video analysis directly based on low-level features, this paper presents a video analysis framework based on human subjective affections, the framework according to the impact on object human subjective affection. First, object-oriented model is established, based on object-oriented...
High speed forklift not only has the engineering working ability as an ordinary forklift, but also comes up to the running speed of 80km/h on highroad with the preferable cross-country performance, so it has received more and more attention in the field of mechanical engineering recently. In this paper, based on the test of vehicle's ride comfort, moment of inertia of body for high speed forklift...
As a basic function of Vehicle Navigation System, the shortest route algorithm has been a research hotspot in vehicle navigation field. Because of real time requirement of the practical system, it is necessary to optimize Dijkstra algorithm - a typical single-source shortest route algorithm. Based on the analysis of the temporal complicacy and spatial complicacy of Dijkstra algorithm, this paper presents...
A hardware in loop simulation(HILS) for vehicle controller used in hybrid electric vehicle(HEV) has done. The simulation results shown the HIL real-time simulation can exactly monitor the performance of vehicle and greatly decrease the development cycle and the cost of vehicle controller.
Considering the nonlinear effects of tyre on the vehicle model, Pacejka tyre model was adopted to set up the 3-D nonlinear dynamic model of four-wheel steering vehicle. Simulations were carried out on the 3-D nonlinear dynamic model for a step input. The simulation results show the advantages of four-wheel steering vehicle. Compared with front wheel steering vehicle, the four-wheel steering vehicle...
The swarm intelligence is attracted by scholars in many fields by its special advantages, and its theories and applications have been developed greatly. As a representative method of swarm intelligence, ant colony optimization (ACO) is used widely because of its realization simply, positive feedback and distribution. The review of the new applications for ACO and its prospect are given in this paper.
The three-dimensional finite element (FE) model of the radial tire was built in the software of MARC. In the FE model of tire, the complexities of material and structure, the friction between the tire and the ground, are fully taken into account. Different rolling conditions were simulated under the standard pressure and rated load. The friction stress distribution characteristics of the tire surface...
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