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SAE International Journal of Vehicle Dynamics Stability and NVH
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Brake Squeal Prevention through Suspension Design and Adaptive Suspension

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Indian Institute of Technology Delhi, India-Shashank Saxena, Jayanta Kumar Dutt
  • Journal Article
  • 10-03-03-0011
Published 2019-09-03 by SAE International in United States
The brake squeal phenomenon has bothered automobile manufacturers for a long time. Although having no ill effects on the braking performance, the squeaky noise is often a nuisance and one of the major complaints of many customers. In order to design quality and noise-free automobiles, the brake squeal issue has to be permanently tackled. Many researchers have suggested shape optimization and additional damping of the disk as brake squeal control measures. Other methods proposed in the literature include the use of a different brake pad material or an anti-squeal paste. However, the effect of the type of brake pad suspension on brake squeal has not been studied. In this article, we demonstrate that the use of a 4-element viscoelastic support can prevent brake squeal for a vehicle speed of 5-200 kmph, which is the practical vehicle speed range. For a 2-element support, we have identified a suitable control parameter and proposed an efficient active control for squeal prevention based on that. A nondimensional analysis has been carried out so as to ensure that the results…
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Application of Optimal Control Method to Path Tracking Problem of Vehicle

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Weifang University, China-Yingjie Liu, Dawei Cui
  • Journal Article
  • 10-03-03-0014
Published 2019-08-26 by SAE International in United States
Path tracking is an essential stage for vehicle safety control. It is more newsworthy than ever in the automotive context and especially for autonomous vehicle. The study proposes an optimal control method for path tracking problem in inverse vehicle handling dynamics. The proposed method generates an expected trajectory which guarantees minimum clearance to the prescribed path by identifying the optimal steering torque input. Based on this purpose, the path tracking problem, which is treated as an optimal control problem, is then solved by local collocation method and mesh refinement. Finally, a real vehicle test is executed to verify the rationality of the proposed model and methodology. The results show that using control variables as a mesh refinement function can capture the dramatic changes in state variables, and the efficiency improvement is more significant as the number of the grid points increases. The study can help drivers easily identify safe lane-keeping trajectories and area.
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An Optical-Based Technique to Obtain Vibration Characteristics of Rotating Tires

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Kettering University, USA-Aakash Mange, Theresa Atkinson, Jennifer Bastiaan, Javad Baqersad
  • Journal Article
  • 10-03-03-0013
Published 2019-08-21 by SAE International in United States
The dynamic characteristics of tires are critical in the overall vibrations of vehicles because the tire-road interface is the only medium of energy transfer between the vehicle and the road surface. Obtaining the natural frequencies and mode shapes of the tire helps in improving the comfort of the passengers. The vibrational characteristics of structures are usually obtained by performing conventional impact hammer modal testing, in which the structure is excited with an impact hammer and the response of the structure under excitation is captured using accelerometers. However, this approach only provides the response of the structure at a few discrete locations, and it is challenging to use this procedure for rotating structures. Digital Image Correlation (DIC) helps in overcoming these challenges by providing the full-field response of the structure. Although there have been many experiments on tires, there are few published papers that investigate the full-field dynamics of rotating tires at high rotating speeds. In the current work, the Kettering University Formula SAE (FSAE) vehicle is loaded on a chassis dynamometer for the purpose of…
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A Heavy Tractor Semi-Trailer Stability Control Strategy Based on Electronic Pneumatic Braking System HIL Test

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Aptiv PLC, USA-Bin Li
State Key Laboratory of Automotive Simulation and Control, Jilin University, China-Hongyu Zheng, Yangyang Miao
  • Journal Article
  • 10-03-03-0016
Published 2019-10-15 by SAE International in United States
Aiming to improve the handling performance of heavy tractor semi-trailer during turning or changing lanes at high speed, a hierarchical structure controller is proposed and a hardware-in-the-loop (HIL) test bench of the electronic pneumatic braking system is developed to validate the proposed controller. In the upper controller, a Kalman filter observer based on the heavy tractor semi-trailer dynamic model is used to estimate the yaw rates and sideslip angles of the tractor and trailer. Simultaneously, a sliding mode direct yaw moment controller is developed, which takes the estimated yaw rates and sideslip angles and the reference values calculated by the three-degrees-of-freedom dynamic model of the heavy tractor semi-trailer as the control inputs. In the lower controller, the additional yaw moments of tractor and trailer are transformed into corresponding wheel braking forces according to the current steering characteristics. The HIL test bench of the electronic pneumatic braking system is built to verify the effectiveness of the strategy. Double lane-change maneuver, sinusoidal maneuver, and J-turn maneuver are selected as handling and stability test conditions. The LabView real-time…
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Nonlinear Iterative Optimization Process for Multichannel Remote Parameter Control

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Meng Li, Yong Zhang
  • Journal Article
  • 10-03-03-0015
Published 2019-10-14 by SAE International in United States
In this article, compared with traditional Remote Parameter Control (RPC), the iterative process is improved based on linear transfer function (TF) estimation of the nonlinear dynamic system. In the improved RPC, the iteration coefficient is designed according to the convergence condition of the nonlinear iterative process, so that the convergence level, convergence speed, and iteration stability could be improved. The difference between the traditional and the improved RPC iterative process is discussed, the RPC iterative process of the nonlinear system is analyzed, and channel decoupling for Multi-Input Multi-Output (MIMO) system based on eigen-decomposition of the system TF and linear TF estimation is introduced. It assumes that the eigenvector matrix of the system TF remains the same, and the linear TF in the iterative process is estimated and updated, which is used for iterative calculation. The method for iteration coefficient is designed according to the nonlinear system convergence condition of the iterative process. The whole theory is verified on a two-channel electrohydraulic servo system and a lightweight motorcycle. The optimization strategy can be used not only…
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Evaluation of Dynamic Wheel Alignment Audit System Performance

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Hunter Engineering Company, USA-Mark E. Stirnemann, Aaron C. Hall, Mark E. Books
  • Journal Article
  • 10-03-03-0012
Published 2019-09-03 by SAE International in United States
Wheel alignment audit systems are used in vehicle service environments to identify vehicles which may benefit from a comprehensive evaluation on a precision static alignment measurement system. Non-contact dynamic wheel alignment audit systems acquire measurement data from vehicles in motion passing between sensors in an inspection lane. The dynamic nature of the moving vehicles introduces variables which are not present when auditing wheel alignment on a static vehicle. Measurement results are affected by changes in vehicle velocity, steering movement, suspension movement, floor surface conditions, tire sidewall profiles, and driver presence, as well as other variables. Examining the effects on acquired measurements introduced to a non-contact dynamic wheel alignment audit system by these variables shows that utilization of multiple points of measurement and statistical averaging techniques allows for meaningful measurement results, enabling a non-contact dynamic wheel alignment audit system to reliably distinguish between moving vehicles which are in need of further inspection for alignment issues and moving vehicles which are aligned within manufacturer tolerances.
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