Topic
Vehicle dynamics
About: Vehicle dynamics is a research topic. Over the lifetime, 12909 publications have been published within this topic receiving 204091 citations.
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TL;DR: In this article, the authors introduce the concept of a linearly increasing variable power to the basic vehicle dynamics model that has been proposed in the literature and calibrates the model to typical truck classifications 8-10 that travel along interstate highways in the United States.
Abstract: This paper introduces the concept of a linearly increasing variable power to the basic vehicle dynamics model that has been proposed in the literature. The paper also calibrates the model to typical truck classifications 8–10 that travel along interstate highways in the United States. The proposed enhancement is demonstrated to result in significant improvements in vehicle performance curves, especially at low speeds when vehicles are engaged in gearshifts.
87 citations
TL;DR: In this article, a fault tolerant control strategy for dynamic positioning of unmanned marine vehicles using the quantized feedback sliding mode control technique is proposed, which is based on switching mechanism to compensate for thruster faults effects.
Abstract: This paper proposes a novel fault tolerant control strategy for dynamic positioning of unmanned marine vehicles using the quantized feedback sliding mode control technique. Due to the complex ocean environment, the unmanned marine vehicles are modeled as the Takagi-Sugeno fuzzy system with unknown membership functions. When the membership functions are not available, traditional sliding mode control technique becomes infeasible. To tackle this difficulty, a novel quantized sliding mode control strategy based on switching mechanism is designed to compensate for thruster faults effects. In addition, the phenomenon of time-varying delay leads to conservativeness of the existing dynamic quantization parameter adjustment strategy. Then a larger quantization parameter adjustment range, by taking time delay and fault factor into account, is given. Combining the novel sliding mode controller design and the improved dynamic quantization parameter adjustment strategy, the dynamic positioning of unmanned marine vehicles with thruster faults and quantization can be maintained. Finally, the effectiveness of the proposed method is verified through the simulation comparison results.
87 citations
TL;DR: In this article, a hydraulic interconnected suspension based on the energy regenerative shock absorbers (HIS-HESA) is proposed to improve ride comfort, road holding ability and energy recovery ability simultaneously.
87 citations
TL;DR: Experimental data confirm that the developed algorithms perform reliably in a number of different maneuvers that include constant steering, ramp steering, double lane change, and sine with dwell steering tests.
Abstract: In active rollover prevention systems, a real-time rollover index, which indicates the likelihood of the vehicle to roll over, is used. This paper focuses on state and parameter estimation for reliable computation of the rollover index. Two key variables that are difficult to measure and play a critical role in the rollover index are found to be the roll angle and the height of the center of gravity of the vehicle. Algorithms are developed for real-time estimation of these variables. The algorithms investigated include a sensor fusion algorithm and a nonlinear dynamic observer. The sensor fusion algorithm requires a low-frequency tilt-angle sensor, whereas the dynamic observer utilizes only a lateral accelerometer and a gyroscope. The stability of the nonlinear observer is shown using Lyapunov's indirect method. The performance of the developed algorithms is investigated using simulations and experimental tests. Experimental data confirm that the developed algorithms perform reliably in a number of different maneuvers that include constant steering, ramp steering, double lane change, and sine with dwell steering tests.
87 citations
07 Sep 2004
TL;DR: In this article, the authors developed a simulation model that can represent the dynamic response of a tire when rolling over uneven road surfaces, which is used as input for the rigid ring model.
Abstract: Nowadays virtual prototyping tools play an important part in the development of vehicles. For studying the dynamics of a vehicle, complex vehicle models are required that are composed of several accurately modelled components. As the tyre constitutes the only contact between the vehicle and the road surface, it is one of the most important components of a vehicle model. For performing ride comfort and durability analyses, there is a need for accurate tyre models that can predict the loads that are transmitted from the tyre to the wheel axle when driving over road irregularities. In this study, such a tyre simulation model is developed that can represent the dynamic response of a tyre when rolling over uneven road surfaces. The approach followed is the combination of the well-known rigid ring dynamic tyre model and a suitable enveloping model that generates a three-dimensional effective road surface, which is used as input for the rigid ring model. The thesis deals with the development of the enveloping models and with the extension of the rigid ring tyre model so that this model is capable of handling the effective road surface. It is shown that the combination of the rigid ring model and the enveloping model can be used successfully to describe the tyre dynamic response to uneven road surfaces. In this research project, numerous experiments have been carried out for model development, parameter identification and model validation. The results of many of these experiments are presented in the thesis.
87 citations