Research on dynamic characteristics and fatigue robust optimization of integrated vehicle model

Abstract

This paper investigates the dynamic characteristics and fatigue robust optimization of heavy-duty tractor. First, this paper presents a vehicle model with sub-structure method. Based on the theory of base motion, the structure dynamic characteristics are analyzed. Second, the accuracy of the method is verified by comparing the experimental results with the simulation results. Also, the dynamic response and the transfer function of vehicle are obtained using the above methods. Combined with the experimental data, the methods of random multiple frequency components and multi-axial fatigue life are adopted to analyze the fatigue damage of the heavy-duty tractor under different road conditions. Finally, the Design for Six Sigma is used to optimize the vehicle’s structure. The results show that by using the proposed method, the dynamic characteristics of the vehicle can be analyzed accurately and effectively, robustness of the vehicle can be improved, and mass of the vehicle can be reduced.

Fatigue life prediction for automobile stabilizer bar

“…At present, it is reasonable and perfect to deal with the fatigue test results as shown in Equation (18). It takes into account the influence of reliability, confidence and test times on the dispersion coefficient (Li, Yuan, Zhao and Wang, 2018; Li, Ye and Zhang, 2018; Li, Liu, Wang and Wang, 2018). It also assumes that the life distribution obeys lognormal distribution and the parent standard deviation is known: where u γ is the standard normal percentile under confidence γ ; u p is the standard normal percentile under given reliability p ; n is the sub-sample number; and σ N is the parent standard deviation.…”

“…A good mesh should have a good mesh quality. Therefore, the mesh quality should be checked to ensure the accuracy of the static analysis results (Li, Yuan, Zhao and Wang, 2018; Li, Ye and Zhang, 2018; Li, Liu, Wang and Wang, 2018).…”

“…When the deformation of the left and right suspensions is not the same, the torsion of bar produces a roll moment opposite to the roll direction of the vehicle body, which reduces the roll angle of the vehicle and achieves the purpose of stabilizer the body. Research shows that many rollover accidents are caused by poor dynamic performance of vehicles (Anubi and Crane Iii, 2013; Li, Yuan, Zhao and Wang, 2018; Li, Ye and Zhang, 2018; Li, Liu, Wang and Wang, 2018). Because of the complexity of driving conditions, the stabilizer bar will often be under the cyclic impact of pavement loads, and even be severely impacted by larger loads.…”

“…Therefore, the service life of customers can be simulated under controlled conditions in the laboratory. Because of the high efficiency and good economy of laboratory test, evaluating fatigue life based on laboratory test can significantly reduce the cost of product design and development (Li, Yuan, Zhao and Wang, 2018; Li, Ye and Zhang, 2018; Li, Liu, Wang and Wang, 2018). Shi et al (2018) performed LCF-creep experiments of full-scale turbine blades under a trapezoidal loading spectrum to investigate the durability life of turbine blades.…”

Determining optimal suspension system parameters for spring fatigue life using design of experiment

“…Saoudi et al [12] extracted force loading from a quarter car model to optimize the design of an automobile lower arm in terms of fatigue using a strain energy model. Fatigue life predictions of automotive components, such as knuckle [13], lower arm [14], and chassis [15], have also been performed using vehicle dynamic model simulations. Fatigue life prediction of automotive components is widely assisted by simulations because of increased convenience and efficiency.…”