Transient vehicle handling analysis with aerodynamic interactions

Hussain, Khalid; Rahnejat, Homer; Hegazy, S.

doi:10.1243/1464419jmbd41

Cited by 10 publications

(11 citation statements)

References 10 publications

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“…The aerodynamic interactions in real world are more complicated. A detailed analysis can be found in Hussain et al 30 To calculate the longitudinal and lateral forces of the tyres, the values of their normal forces must be determined. According to assumption 1, the required relations to calculate these forces are presented as…”

Section: Assumptionmentioning

confidence: 99%

Integrated longitudinal and lateral guidance of vehicles in critical high speed manoeuvres

Sazgar

Azadi

Kazemi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part K:

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One of the most important and conventional manoeuvres, that is not easy to even skilled drivers, is the high-speed critical lane change on the highways. The main contribution of this study is the development of an integrated longitudinal and lateral guidance algorithm for these manoeuvres. This algorithm consists of two parts: the trajectory planning and the integrated control. In the first part, taking into account the position of the target vehicle for different accelerations, several trajectories are produced. Next, considering the dynamic capabilities of the vehicle, the most appropriate trajectory is selected. Since the proposed trajectory planning approach works algebraically, its computational cost is negligible, which is very valuable for practical implementations. In the second step, using a robust-integrated longitudinal–lateral controller, the control inputs are calculated and transmitted to the brakes, throttle and steering actuators. It should be noted that the trajectory planning and the integrated controller are based on the seven degrees of freedom model of the vehicle, and the nonlinear dynamics of the tyre and the dynamics of the brakes/throttle actuators are also taken into account. To assess the efficiency of the integrated longitudinal–lateral guidance algorithm, the full vehicle model is used in the CarSim–Simulink software. In order to have conditions closer to real applications, it is assumed that the yaw rate and the longitudinal and lateral accelerations of the vehicle are noisy, and the longitudinal and lateral velocities are predicted using the same signals. Obtained results for the critical collision avoidance manoeuvres confirm the effectiveness of the proposed planned trajectory and the good performance of the combined control method. In addition, the results indicate that the integrated control is robust against the variation of friction coefficient and unmodelled dynamics while maintaining the vehicle stability.

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Section: Assumptionmentioning

confidence: 99%

Integrated longitudinal and lateral guidance of vehicles in critical high speed manoeuvres

Sazgar

Azadi

Kazemi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

show abstract

“…The complex full vehicle models with more details are presented in the literature. [22][23][24] On the other hand, to find a simple version of the complex full car model, semi-trailing and semi-leading arms to limit dive and squat that affect braking and slipping at the tyre contact patch are ignored. A more detailed model is presented in Azman et al 25 The governing equations of longitudinal, lateral and yaw motions in the 14-DOF vehicle model are derived as follows In addition, the bounce, pitch and roll motions of vehicle body as well as vertical motions of four unsprung masses are derived as follows…”

Section: Modelling Of Braking and Suspension Systems Mathematical Modmentioning

confidence: 99%

Novel constrained control of active suspension system integrated with anti-lock braking system based on 14-degree of freedom vehicle model

Aghasizade

Mirzaei

Rafatnia

2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper deals with a novel method for integration of the active suspension system and the anti-lock braking system. In the proposed method, a new nonlinear controller with state constraints is developed for the active suspension system based on the response prediction of 14-degree of freedom vehicle model. The proposed controller isolates the vehicle from road roughness in normal conditions and assists the anti-lock braking system by ensuring a good contact between the tyre and road during hard braking. In addition, the tyre deflection is limited to prevent the threat of tyre bursting. To develop the active suspension system controller, at first, a performance index consisting of a weighted combination of predicted responses of suspension system is expanded as a function of current control input. At the same time, the state constraints of tyre normal force and tyre deflection are transformed to the equivalent constraints of control input by the same prediction approach. Then, the control law is found by minimizing the expanded performance index in the presence of input constraints. The Karush-Kuhn-Tucker theorem is employed to solve the performed constrained optimization problem analytically. The performance of the proposed active suspension system controller integrated with the designed nonlinear anti-lock braking system controller is evaluated for a full vehicle model including roll and pitch motions during braking on irregular random roads. The results show that both the body acceleration and the vehicle stopping distance are decreased for the proposed integrated strategy compared with other conventional strategies.

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“…Larger detailed vehicle models are commonly used in industry as a part of vehicle development programmes. Representative literature include a series of papers by Blundell (1999), Hegazy et al (2000) and Hussain et al (2007), which include tyre forces, aerodynamic forces and complex manoeuvres (see also chapter 23, using the Newton-Euler approach). Inclusion of component flexibility became possible later with integration of finite element techniques and multi-body methods through mode reduction and selection techniques such as component mode synthesis.…”

Section: 5-engine As a Multi-body Systemmentioning

confidence: 99%

An introduction to multi-physics multi-scale approach

Rahnejat

2010

Tribology and Dynamics of Engine and Powertrain

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Transient vehicle handling analysis with aerodynamic interactions

Cited by 10 publications

References 10 publications

Integrated longitudinal and lateral guidance of vehicles in critical high speed manoeuvres

Integrated longitudinal and lateral guidance of vehicles in critical high speed manoeuvres

Novel constrained control of active suspension system integrated with anti-lock braking system based on 14-degree of freedom vehicle model

An introduction to multi-physics multi-scale approach

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