# Establishing a Nonlinear Mathematical Model to Simulate the Vehicle Oscillation

Establishing a Nonlinear Mathematical Model to Simulate the Vehicle Oscillation

Duc Ngoc Nguyen* Tuan Anh Nguyen

Automotive Engineering Department, Thuyloi University, 175 Tay Son, Dong Da, Hanoi 100000, Vietnam

Corresponding Author Email:
ndn@tlu.edu.vn
Page:
289-297
|
DOI:
https://doi.org/10.18280/mmep.100134
3 December 2022
|
Accepted:
25 January 2023
|
Published:
28 February 2023
| Citation

OPEN ACCESS

Abstract:

The content done in this article is the problems with the vehicle's rollover dynamics when steering. In this article, a complex dynamics model is established, which fully includes the influence of external factors. This complex model combines the models of spatial dynamics (7 DOFs - degrees of freedom), nonlinear double-track dynamics (3 DOFs), and the Pacejka nonlinear tire model. The simulation and calculation process are done by the MATLAB-Simulink application. The input parameters of the oscillation problem include the steering angle and velocity of the vehicle. These values are adjusted based on three specific cases and three situations. The output values that can evaluate the vehicle's oscillations include the roll angle, vertical force, and a trajectory of the vehicle. The results of the article have shown the oscillation of an automobile in all investigated cases. As a consequence of these findings, the vehicle's oscillation is greatest when the speed and steering angle reach their maximum values. When the vehicle was steered in "Fishhook" mode, the vehicle rolled over at v2 = 70 (km/h) and v3 = 80 (km/h). The limited roll angle corresponding to these two situations are 9.41˚ and 9.26˚, respectively. Under the influence of the tire's nonlinear deformation, the vehicle's motion trajectory also changes greatly. This model should be used for research problems involving motion trajectories and vehicle rollover.

Keywords:

vehicle dynamic, complex model, simulation and model, oscillation

1. Introduction

Vehicle dynamics is a fairly common topic. It has been studied for many years. The level of research in this area has changed over time. This field usually involves the study of oscillations and movements of the vehicle when going straight or steering. Besides, studies of suspension system vibration can also be considered [1]. The input parameters of the problem of vehicle dynamics usually include the speed of a vehicle, the steering angle, the roughness of the road surface, etc. Output values can be mentioned as roll angle, yaw angle, vertical force, longitudinal force, lateral force, acceleration and displacement of the sprung mass, etc. [2]. Depending on the problem, there will be specific content.

An integrated dynamics model is often utilized in order to simulate the vehicle's oscillations when steering. This model will include an oscillation model of the vehicle body, a model of motion, and a tire model. There are some combinations of vehicle dynamics models. For the oscillation model of the vehicle body, researchers often use a half dynamics model [3]. This model is quite simple; it only includes 4 degrees of freedom (DOFs) [4]. If seats are included, a number of DOFs of this model can be increased [5]. The half-dynamics model usually only includes the influence of pitch angle or roll angle [6, 7]. Spatial dynamics models can include both of these influences [8]. According to Nguyen, spatial dynamics models usually have 7 degrees of freedom [9, 10]. For large vehicles, a number of DOFs can be more [11]. When the vehicle is moving, single-track or double-track dynamics models can be used [12, 13]. The linear single-track dynamics model is much simpler than the others. According to Gao et al. [14], two wheels on an axle can be combined. This model includes only 2 degrees of freedom [15]. In this model, many effects were ignored [16]. In contrast, the nonlinear double-track dynamics model will consider all influences of the wheels [17]. In this model, the steering angles of the wheels can be the same or different [18]. Unknowns in the motion model are usually lateral force Fy, longitudinal force Fx, etc. These values can be calculated according to the tire model. The linear tire model is the simplest [19]. However, its accuracy is not high. The linear tire model is only valid when an automobile is traveling at a low velocity and the steering angle is small [20]. The linear tire model can be incorporated with a linear single-track or nonlinear double-track dynamics model [21]. To be able to accurately assess the impact of the tire, several modern tire models should be used, such as Pacejka, Ammon, Burckhardt, Empirical, Dugoff, Brush, etc. [22-25]. In addition, the combination of simulation software and intelligent algorithms is also recommended to be able to determine the tire influence [26-28].

This article aims to establish a model of complex dynamics to simulate vehicle oscillations. This model includes external influences when an automobile is travelling on the road. This combines a spatial dynamics model (7 DOFs) and a nonlinear double-track model (3 DOFs). The 7 DOFs spatial dynamics model provides a complete description of vehicle oscillations, which include vertical, roll, and pitch displacements. Meanwhile, the 3 DOFs nonlinear double-track dynamics model describes the influence of all four wheels on the car's motion (including longitudinal, lateral, and yaw movements). In addition, the nonlinear motion model describes the influence of other external factors, such as lateral and longitudinal wind forces (if applicable). Besides, the interaction between the wheel and the road surface is determined by the Pacejka nonlinear tire model. This tire model considers the tire's elastic deformation during steering, which involves varying the tire lateral force values. Compared with conventional linear models (such as the half model, which is combined with the linear single-track model and the linear tire model), the model of the complex dynamics that is designed in this study helps to describe the oscillations more wholly and accurately. This model is rarely used because of its computational complexity. The process of numerical simulation and calculation is done by MATLAB software with specific cases. The main content of this article includes of four sections, including introduction section, complex dynamics model section, simulation and discussions section, and conclusion section.

2. A Complex Dynamics Model

The complex dynamics model consists of three components: the fully dynamics model, the nonlinear double-track model, and the nonlinear tire model. The fully dynamics model with 7 DOFs is shown in Figure 1. In this model, a vehicle body is called a sprung mass. Components below a suspension system are known as "unsprung mass". Using the separation method, the sprung mass performs three movements corresponding to three DOFs, including vertical displacement, roll, and pitch. Meanwhile, the four unsprung masses only perform four vertical displacements, corresponding to four DOFs. The tire's damping component is ignored because its damping capacity is much smaller than the suspension dampers. The equations describing vehicle's oscillations when steering is pointed as below:

## figure_1.png

Figure 1. Model of the fully dynamics with 7 DOFs

${{F}_{ims}}=\sum\limits_{i,j=1}^{2}{\left( {{F}_{Kij}}+{{F}_{Cij}} \right)}$    (1)

\begin{aligned} & M_\phi=\sum_{i, j=1}^2\left[(-1)^{j-1}\left(F_{K i j}+F_{C i j}\right) t_{w i}\right] \\ & +\left\{g \sin \phi+\left[\dot{v}_y+(\dot{\beta}+\dot{\psi}) v_x\right] \cos \phi\right\} m_s h_\phi\end{aligned}    (2)

${{M}_{\theta }}=\sum\limits_{i,j=1}^{2}{{{\left( -1 \right)}^{i-1}}\left( {{F}_{Kij}}+{{F}_{Cij}} \right){{b}_{i}}}$    (3)

${{F}_{imuij}}={{F}_{KTij}}-{{F}_{Kij}}-{{F}_{Cij}}$    (4)

where:

${{F}_{ims}}={{m}_{s}}{{\ddot{z}}_{s}}$    (5)

${{F}_{imuij}}={{m}_{uij}}{{\ddot{z}}_{uij}}$    (6)

${{F}_{Kij}}={{K}_{ij}}\left[ {{z}_{s}}-{{z}_{uij}}+{{\left( -1 \right)}^{j+1}}{{t}_{wi}}\phi +{{\left( -1 \right)}^{i+1}}{{b}_{i}}\theta \right]$    (7)

${{F}_{Cij}}={{C}_{ij}}\left[ {{{\dot{z}}}_{s}}-{{{\dot{z}}}_{uij}}+{{\left( -1 \right)}^{j+1}}{{t}_{wi}}\dot{\phi }+{{\left( -1 \right)}^{i+1}}{{b}_{i}}\dot{\theta } \right]$    (8)

${{F}_{KTij}}={{K}_{Tij}}\left( {{z}_{rij}}-{{z}_{uij}} \right)$    (9)

${{M}_{\phi }}=\left( {{J}_{\phi }}+{{m}_{s}}h_{\phi }^{2} \right)\ddot{\phi }$    (10)

${{M}_{\theta }}=\left( {{J}_{\theta }}+{{m}_{s}}h_{\theta }^{2} \right)\ddot{\theta }$    (11)

The components of the longitudinal velocity vx, lateral velocity vy, and yaw angle $\psi$ are determined by a nonlinear double-track dynamics model (Figure 2). This model performs three movements, including longitudinal x, lateral y, and yaw $\psi$, corresponding to three degrees of freedom.

## figure_2.png

Figure 2. Model of the nonlinear double-track dynamics

${{F}_{ix}}=\sum\limits_{i,j=1}^{2}{\left( {{F}_{xij}}cos{{\delta }_{ij}}-{{F}_{yij}}sin{{\delta }_{ij}} \right)}-{{F}_{1}}+{{F}_{cex}}$    (12)

${{F}_{iy}}=\sum\limits_{i,j=1}^{2}{\left( {{F}_{xij}}sin{{\delta }_{ij}}+{{F}_{yij}}cos{{\delta }_{ij}} \right)}-{{F}_{2}}-{{F}_{cey}}$    (13)

$M_\psi=\sum_{i, j=1}^2\left[\begin{array}{l}(-1)^j\left(F_{x i j} \cos \delta_{i j}-F_{y i j} \sin \delta_{i j}\right) t_{\mathrm{w} i} \\ +(-1)^{i+1}\left(F_{x i j} \sin \delta_{i j}+F_{y i j} \cos \delta_{i j}\right) b_i \\ +F_i c_i-M_{z i j}\end{array}\right]$    (14)

where:

${{F}_{ix}}=\left( {{m}_{s}}+\sum\limits_{i,j=1}^{2}{{{m}_{ij}}} \right){{\dot{v}}_{x}}$    (15)

${{F}_{iy}}=\left( {{m}_{s}}+\sum\limits_{i,j=1}^{2}{{{m}_{ij}}} \right){{\dot{v}}_{y}}$    (16)

${{F}_{cex}}=\left( {{m}_{s}}+\sum\limits_{i,j=1}^{2}{{{m}_{ij}}} \right)\left( \dot{\beta }+\dot{\psi } \right){{v}_{y}}$    (17)

${{F}_{cey}}=\left( {{m}_{s}}+\sum\limits_{i,j=1}^{2}{{{m}_{ij}}} \right)\left( \dot{\beta }+\dot{\psi } \right){{v}_{x}}$    (18)

${{M}_{\psi }}={{J}_{\psi }}\ddot{\psi }$    (19)

$\beta =arctan\frac{{{v}_{y}}}{{{v}_{x}}}$    (20)

The forces and moments at the wheel, including longitudinal force Fx, moment Mz, and lateral force Fy are calculated by a tire model. In this article, the Pacejka tire model is utilized.

Longitudinal force Fx:

${{F}_{x}}={{D}_{x}}sin\left[ {{C}_{x}}artan\left( {{B}_{x}}{{\kappa }_{x}} \right) \right]$    (21)

where:

${{\kappa }_{x}}=\left( 1-{{E}_{x}} \right)\lambda +\frac{{{E}_{x}}}{{{B}_{x}}}arctan\left( {{B}_{x}}\lambda \right)$    (22)

${{C}_{x}}=1.65$    (23)

${{D}_{x}}={{a}_{1}}F_{z}^{2}+{{a}_{2}}{{F}_{z}}$    (24)

$BC{{D}_{x}}=\frac{{{a}_{3}}F_{z}^{2}+{{a}_{4}}{{F}_{z}}}{{{e}^{{{a}_{5}}{{F}_{z}}}}}$    (25)

${{B}_{x}}=\frac{BC{{D}_{x}}}{{{C}_{x}}{{D}_{x}}}$    (26)

${{E}_{x}}={{a}_{6}}F_{z}^{2}+{{a}_{7}}{{F}_{z}}+{{a}_{8}}$    (27)

Lateral force Fy:

${{F}_{y}}={{D}_{y}}sin\left[ {{C}_{y}}artan\left( {{B}_{y}}{{\kappa }_{y}} \right) \right]+{{S}_{vy}}$    (28)

where:

${{\kappa }_{y}}=\left( 1-{{E}_{y}} \right)\left( \alpha +{{S}_{hy}} \right)+\frac{{{E}_{y}}}{{{B}_{y}}}arctan\left[ {{B}_{y}}\left( \alpha +{{S}_{hy}} \right) \right]$    (29)

${{C}_{y}}=1.30$    (30)

${{D}_{y}}={{a}_{1}}F_{z}^{2}+{{a}_{2}}{{F}_{z}}$    (31)

$BC{{D}_{y}}={{a}_{3}}sin\left[ {{a}_{4}}artan\left( {{a}_{5}}{{F}_{z}} \right) \right]$    (32)

${{B}_{y}}=\frac{BC{{D}_{y}}}{{{C}_{y}}{{D}_{y}}}$    (33)

${{E}_{y}}={{a}_{6}}F_{z}^{2}+{{a}_{7}}{{F}_{z}}+{{a}_{8}}$    (34)

${{S}_{hy}}={{a}_{9}}\gamma$    (35)

${{S}_{vy}}=\left( {{a}_{10}}F_{z}^{2}+{{a}_{11}}{{F}_{z}} \right)\gamma$    (36)

Aligning moment Mz:

${{M}_{z}}={{D}_{z}}sin\left[ {{C}_{z}}artan\left( {{B}_{z}}{{\kappa }_{z}} \right) \right]+{{S}_{vz}}$    (37)

where:

${{\kappa }_{z}}=\left( 1-{{E}_{z}} \right)\left( \alpha +{{S}_{hz}} \right)+\frac{{{E}_{z}}}{{{B}_{z}}}arctan\left[ {{B}_{z}}\left( \alpha +{{S}_{hz}} \right) \right]$    (38)

${{C}_{z}}=2.40$    (39)

${{D}_{z}}={{a}_{1}}F_{z}^{2}+{{a}_{2}}{{F}_{z}}$    (40)

$BC{{D}_{z}}=\frac{{{a}_{3}}F_{z}^{2}+{{a}_{4}}{{F}_{z}}}{{{e}^{{{a}_{5}}{{F}_{z}}}}}$    (41)

${{B}_{z}}=\frac{BC{{D}_{z}}}{{{C}_{z}}{{D}_{z}}}$    (42)

${{E}_{z}}={{a}_{6}}F_{z}^{2}+{{a}_{7}}{{F}_{z}}+{{a}_{8}}$    (43)

${{S}_{hz}}={{a}_{9}}\gamma$    (44)

${{S}_{vz}}=\left( {{a}_{10}}F_{z}^{2}+{{a}_{11}}{{F}_{z}} \right)\gamma$    (45)

## figure_3.png

Figure 3. Slip ratio and longitudinal force

## figure_4.png

Figure 4. Slip angle and lateral force

Based on the established tire model, the dependence between slip ratio and longitudinal force; the slip angle and lateral force is shown in Figure 3 and Figure 4.

3. Simulation and Discussions

3.1 Simulation

To simulate vehicle dynamics when steering, some vehicle motion conditions should be defined in advance. There are three steering angles used (Figure 5), including single-lane change, J-turn, and fishhook, corresponding to three cases. These three typical types of steering often occur when drivers use cars. Besides, these types of steering are also often used in simulation problems related to vehicle rollover oscillations. In each case, the speed of the vehicle will change to the following values: v1 = 60 (km/h), v2 = 70 (km/h), and v3 = 80 (km/h). The simulation and calculation are done by MATLAB application. The outputs of this problem include the vertical force, roll angle, and the trajectory of a vehicle.

The automobile's parameters are referred to in Table 1.

## figure_5.png

Figure 5. Steering angle (a – single lane change; b – J-turn; c – fishhook)

Table 1. The vehicle parameters

 Symbol Description Value Unit ms Sprung mass 1850 kg mu Unsprung mass 40 kg bi Distance from the center of gravity to axle 1.25/1.64 m twi Half of the track width 0.730/0.725 m $\mathrm{J}_\phi$ The moment of inertia of the roll-axis 710 kgm2 $\mathrm{J}_\theta$ The moment of inertia of the pitch-axis 2795 kgm2 $\mathrm{J}_\psi$ The moment of inertia of the yaw-axis 2710 kgm2 $\mathrm{h}_\theta$ Distance from the center of gravity to roll-axis 0.53 M g Gravitational acceleration 9.81 m/s2 Ci Damping coefficient 3150/3080 Ns/m Ki Spring coefficient 38500/37300 N/m KTi Tire coefficient 17500/17500 N/m

3.2 Results

Case 1: Single-lane change

Automobiles often utilize the "single-lane change" steering angle when changing lanes. Because the distance between the two lanes is small, a steering angle used is also very small. A change of the roll angle with simulation time is illustrated in Figure 6. These values are very small and do not affect the stability of an automobile. Because the vehicle oscillation is small, the change in dynamics force at wheels is also not large (Figure 7). If the velocity is smaller, the change will be smaller. When the steering wheel returns to its original position, the change in these values is also gone.

## figure_6.png

Figure 6. Roll angle – Case 1

## figure_7.png

Figure 7. Vertical force – Case 1

The vehicle’s trajectory in motion is shown in Figure 8. When the speed is greater, the trajectory of the vehicle's motion will also be larger (both longitudinally and laterally). In this case, the results obtained from the simulation of the nonlinear model are similar to those obtained from conventional linear models. Larger steering angles are needed to show the difference.

## figure_8.png

Figure 8. The trajectory of the vehicle – Case 1

Case 2: J-turn

A "J-turn" steering angle is often utilized when an automobile enters the roundabout. The value of the steering angle will be increased by a certain amount. After that, this value will be kept for a period of time. Figure 9 illustrates a change in the roll angle corresponding to three velocity values. According to these results, a maximum roll angle value is 8.21˚ at a velocity of v3 = 80 (km/h). After the maximum value is reached, the magnitude of the roll angle will decrease with time. Although the steering angle remains the same, the roll angle still changes. This is caused by the nonlinear deformation of a tire. The tire's slip angle will gradually decline with time, so the value of the lateral force will also decline gradually. This results in a decreasing a vehicle roll angle. However, it is only zero once the steering angle is zero.

## figure_9.png

Figure 9. Roll angle – Case 2

## figure_10.png

Figure 10. Vertical force – Case 2

## figure11.png

Figure 11. The trajectory of the vehicle – Case 2

The change in the dynamics force at wheels will follow the change in a roll angle (Figure 10). This difference is greatest when an automobile is travelling at its highest speed. Then, this difference will decrease over time. In the third situation (the vehicle moves at v3), the minimum value of the dynamics force at a wheel is only 730.4 (N). This is a small value. Once this value approaches zero, the wheel can be detached from the road. At that time, a phenomenon of the rollover may occur.

If the vehicle only uses a simple dynamics model, which includes a combination of a linear single-track dynamics model, a half-dynamics model, and a linear tire model, the vehicle's trajectory will take the form of a circle with a constant radius. In this article, a model of complex dynamics that takes into account nonlinear tire deformation is used, so the vehicle's trajectory changes nonlinearly. This trajectory has the form of a spiral curve with a decreasing radius. At the same time, the vehicle's trajectory will be longer if its velocity is greater (Figure 11).

## figure_12.png

Figure 12. Roll angle – Case 3

## figure_13.png

Figure 13. Vertical force – Case 3

Case 3: Fishhook

When evaluating the rollover phenomenon, the "fishhook" steering angle is often used. This type of a steering angle can cause the rollover phenomenon at high speeds. This steering angle has two phases. In the second phase, the steering acceleration and steering angle are also larger. At a velocity of v1 = 60 (km/h), the vehicle has not rolled over. The maximum roll angle value is only 8.19˚, corresponding to the minimum dynamics force value at the wheel of 751.9 (N). Once the speed is increased to v2 = 70 (km/h), the rollover occurs at time t = 3.78 (s), and the limited roll angle can achieve 9.41˚. If the speed continues to increase, v3 = 80 (km/h), the vehicle may roll over sooner. Therefore, the limited roll angle is only 9.26˚ (Figure 12).

Once the vehicle rolls over, the vertical force at the wheel is reduced to zero. This is a warning sign of the rollover phenomenon (Figure 13). In this case, the vehicle's trajectory has a rather complicated form. Because of the effect of high speed and large steering angle, the nonlinear deformation of the tire will also be larger (Figure 14).

## figure_14.png

Figure 14. The trajectory of the vehicle – Case 3

4. Conclusion

This article focuses on simulating the vehicle's rollover oscillations when steering. A complex rollover dynamics model is established in this study. This combines the fully dynamics model, the nonlinear double-track dynamics model, and the nonlinear tire model. Factors affecting vehicle oscillation are fully included in this model. The simulation process is done by MATLAB software with three cases. In each case, three velocity values are used. The output values of the simulation include the roll angle, vertical force, and a trajectory of the vehicle.

Simulation results have shown the change in these values over time. Once the steering angle is larger, or the travel speed is greater, the change in value will also be larger. In the third case, the vehicle rolled over at v2 and v3. The values obtained from the simulation are completely consistent with reality. This model of complex dynamics can be used for complex antiroll and oscillation control problems. However, this study still has some disadvantages that cannot be resolved entirely, such as the parameters of the nonlinear tire model cannot be absolutely accurate, the influencing factors of the road surface and the wind have not been fully mentioned, etc. In the future, these problems should be fixed. In addition, conducting some tests on automotive dynamics is necessary to help substantiate the results of this research.

Nomenclature
 $\theta$ Pitch angle, rad $\psi$ Yaw angle, rad $\phi$ Roll angle, rad $\delta$ Steering angle, rad zs Displacement of the sprung mass, m zu Displacement of the unsprung mass, m zr Roughness on the road, m FC Damping force, N FK Spring force, N FKT Tire force, N Fx Longitudinal force, N Fy Lateral force, N Fz Vertical force, N Mz Aligning moment, Nm vx Longitudinal velocity, m/s vy Lateral velocity, m/s
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