An investigation of a bus’s ride comfort by using the quarter car model with linear asymmetric damper

Le, Dinh Duy; Tran, Huu Nhan

doi:10.21595/jve.2022.22811

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…As for the cases of asymmetric shock absorbers, the obtained 𝐺 and 𝐺 are calculated by the Eqs. (8)(9), in the frequency domain, Fig. 6.…”

Section: Gain Response Of Sddmentioning

confidence: 99%

“…The influence of LA shock absorber under the effect of the harmonic excitation was studied to improve the vehicle's ride comfort, by the 2 DOF quarter car model [8]. Recently, an investigation of a bus's ride comfort with the two types of LS and LA shock absorbers was carried out, in which the quarter car model was employed, subjected under transient and random road excitations [9].…”

Section: Introductionmentioning

confidence: 99%

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Influence of a nonlinear asymmetric shock absorber on vibration of a bus subjected to harmonic excitation

Tran,

E. Gunawan,

Pham

2023

J. vibroeng.

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The main focus of paper is to get full understanding of four different types of shock absorbers characteristics and their effects on the vertical evaluation indexes of a bus subjected to harmonic excitation. The quarter car with two degree of freedom (2DOF) model was employed to calculate the vertical evaluation indexes. The bus is assumed to travel at a constant velocity on a road surface with a profile following a sinusoidal function. The four types of the shock absorber are Linear Symmetric (LS), Nonlinear Symmetric (NS), Linear Asymmetric (LA), and Nonlinear Asymmetric (NA). As for the LS type, the damping force is a linear function of the relative velocity, and the damping force is symmetric for the conditions of the positive and negative relative velocities. Same as for the LA type, it means that the damping force is linear, however it is asymmetric and differentiated according to the suspension state of stroke (compression or extension). As for the NS type, the damping force function is symmetric, nonlinear, differentiated according to the magnitude of the relative velocity. As for the last NA type, the damping force function is also nonlinear and differentiated according to the magnitude of the relative velocity, but it is also asymmetric. The obtained evaluation indexes of the relative displacement of the bus suspension, acceleration of the bus body, and the dynamic tire load within the frequency range of 0 and 25 (Hz), the common frequency range of the bus in operations. The results suggest that the NA shock absorber type is more effective in reducing the suspension dynamic deflection stroke, improving the road holding and maintaining the ride comfort. The systematic assessments of the shock absorber characteristics should guide interested readers in selecting the most appropriate damping coefficient.

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“…As for the cases of asymmetric shock absorbers, the obtained 𝐺 and 𝐺 are calculated by the Eqs. (8)(9), in the frequency domain, Fig. 6.…”

Section: Gain Response Of Sddmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of a nonlinear asymmetric shock absorber on vibration of a bus subjected to harmonic excitation

Tran,

E. Gunawan,

Pham

2023

J. vibroeng.

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Determination and Characterization of Optimum Non-Linear Damping in Vehicle Suspension System

Soong,

Goh,

Phang

2024

J. Phys.: Conf. Ser.

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Vehicle suspension system plays a crucial role in ensuring ride comfort, stability and safety of vehicle and passengers. Damping, a critical component of suspension system, attenuates vehicle vibrations and impacts onto the vehicle structure and passengers, thereby enhancing the overall vehicle performance, namely ride comfort and road holding. Traditionally, linear damping model has been employed, however the dynamic nature of real-world driving conditions often requires a more detailed understanding of damping behaviour, particularly in non-linear regime. This paper focuses on the determination and characterization of the optimum non-linear damping profile in vehicle suspension considering vehicle ride performance criteria using a 2 degree-of-freedom quarter vehicle model and then comparing them between linear and non-linear damping regimes. A comprehensive computational mathematical model is developed in MATLAB® environment to simulate the complex interactions between the vehicle, suspension components and road input. Multi-objective genetic algorithm optimization technique is then implemented to determine the optimum non-linear damping in the form of Pareto front using MATLAB® Global Optimization Toolbox by minimizing the two conflicting objectives which are vehicle body acceleration and dynamic tire load, which represents the ride comfort and road holding ability. Through computational simulation studies, the effects of non-linear damping on ride comfort and road holding ability can be evaluated and compared with linear damping model. In non-linear damping, the damping force does not increase linearly with the velocity of the suspension movement as in linear damping. Instead, the damping force changes at different rates depending on the velocity or displacement change. However, its non-linear profile remains unknown and need to be determined. Hence, the characteristic of non-linear damping is then determined through curve-fitting method, selecting a mathematical representation which best-fits the non-linear profile. As a result, the non-linear damping profile obtained is discovered to have low damping at the early velocity range, proceeding with an overall increasing trend, and then saturated towards the end of the velocity range, is a 5th order polynomial damping model.

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Analysis of a bus vertical dynamic performances – a comparison between linear and nonlinear suspension systems

Tran,

Pham

2024

J. vibroeng.

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This paper mainly focuses on the numerical calculation to determine the vertical evaluation indexes with all three types of typical harmonic, transient and random road excitations. The effects of linear and nonlinear suspension characteristics on the vertical evaluation indexes are fully understood systematically. The ride comfort, suspension working space, and road holding are analyzed for both two cases of linear and nonlinear suspension systems. The improvement of the vertical stability and road holding in the case of nonlinear suspension subjected under three different excitations could be characterized most meaningfully. The obtained results help to systematically get full understanding of the investigated problem nature. It also should guide interested readers in suspension design to improve the stability, safety, and ride comfort of buses.

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An investigation of a bus’s ride comfort by using the quarter car model with linear asymmetric damper

Cited by 3 publications

References 15 publications

Influence of a nonlinear asymmetric shock absorber on vibration of a bus subjected to harmonic excitation

Influence of a nonlinear asymmetric shock absorber on vibration of a bus subjected to harmonic excitation

Determination and Characterization of Optimum Non-Linear Damping in Vehicle Suspension System

Analysis of a bus vertical dynamic performances – a comparison between linear and nonlinear suspension systems

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