Modelling rolling-lobe air springs

Fox, M.N.; Roebuck, Richard; Cebon, David

doi:10.1504/ijhvs.2007.015603

Cited by 18 publications

(9 citation statements)

References 3 publications

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“…Based on the laws of thermodynamics [6], if the compression or the expansion stroke of the air spring is rapid enough, it can be regarded as an adiabatic process. Thus, the air state of the air spring can be defined as:…”

Section: Air Suspension System Dynamic Modelmentioning

confidence: 99%

Comparing the performance of suspension system of semi-trailer truck with two air suspension systems

Le¹

2017

Vib. proced.

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Abstract. In order to compare the performance of heavy truck suspension system, a 3D dynamic model with 14 degrees of freedom is developed with the dynamic models of the traditional and new air suspension systems to compare the performance of the air suspension systems for reducing the negative impacts on the road surface when vehicle moves on the different road conditions. Dynamic modes of two different types of the air suspension systems are respectively established and a dynamic load coefficient (DLC) is chosen as objective function which uses Matlab/Simulink software to simulate and determine the values of objective function. The results shown that the performance of the new air suspension system is better than the tradition air suspension for reducing the negative impact on road surface under the different operating conditions of vehicle. Especially, the DLC values of wheels at 3rd axle of vehicle with the new air suspension system are respectively reduced by 6.7 %, 7.0 %, 7.4 %, 7.7 % and 8.5 % in comparison with the traditional air suspension system when vehicle moves on the different pavement conditions a velocity of 20 m/s and fully loaded. In addition, the study results not only can provide a reference for designers but also traffic management to reduce the negative impact on road surface.

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Section: Air Suspension System Dynamic Modelmentioning

confidence: 99%

Comparing the performance of suspension system of semi-trailer truck with two air suspension systems

Le¹

2017

Vib. proced.

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“…Thus, a nonlinear spring model is used as one of original works in the modeling of the semi-active suspension system. Referring to Fox's description [35], the modeling of the rolling lobe air spring should be based on the effective volume, area, and other structural parameters. The variation of the interior air pressure and the cavity volume of air spring caused by the change of load should also be considered during the modeling process.…”

Section: Air Springmentioning

confidence: 99%

A Noise-Insensitive Semi-Active Air Suspension for Heavy-Duty Vehicles with an Integrated Fuzzy-Wheelbase Preview Control

Xie

Wong

Zhao

et al. 2013

Mathematical Problems in Engineering

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Semi-active air suspension is increasingly used on heavy-duty vehicles due to its capabilities of consuming less power and low cost and providing better ride quality. In this study, a new low cost but effective approach, fuzzy-wheelbase preview controller with wavelet denoising filter (FPW), is developed for semi-active air suspension system. A semi-active suspension system with a rolling lobe air spring is firstly modeled and a novel front axle vertical acceleration-based road prediction model is constructed. By adopting a sensor on the front axle, the road prediction model can predict more reliable road information for the rear wheel. After filtering useless signal noise, the proposed FPW can generate a noise-insensitive control damping force. Simulation results show that the ride quality, the road holding, the handling capability, the road friendliness, and the comprehensive performance of the semi-active air suspension with FPW outperform those with the traditional active suspension with PID-wheelbase preview controller (APP). It can also be seen that, with the addition of the wavelet filter, the impact of sensor noise on the suspension performance can be minimized.

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“…The vertical stiffness of air springs has been extensively researched over the past 60 years. Fox et al 1 developed a semiempirical mathematical model of an RLAS. The numerical results showed good agreement with the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Theoretical modelling and experimental analysis of the vertical stiffness of a convoluted air spring including the effect of the stiffness of the bellows

Chen

Yin

Rakheja

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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A new refined model including a model of the bellows to describe the vertical stiffness of a convoluted air spring is developed. The new model of a convoluted air spring incorporates the structural parameters including the effective area, the rate of change in the effective area, the effective volume, the rate of change in the effective volume and the stiffness of the bellows. Analytical models of the structural parameters of a convoluted air spring are established using a geometrical analysis approach. Two convoluted air springs (type 1B5002 and type 2B5281) are designed and manufactured for testing purposes. An experimental set-up is designed in order to carry out identification of the structural parameters and to test the vertical static stiffness and the vertical dynamic stiffness. The analytical models of the structural parameters are validated by experiments, which provide good design guidance and improvement in the convoluted air spring at the design stage. Tests on the vertical static stiffness and the dynamic stiffness indicate that the stiffness of the bellows should be considered; furthermore, the stiffness of the bellows exhibits amplitude-dependent chacteristics and frequency-dependent characteristics. In a different approach from the previous studies, a model of the bellows is developed in this paper and is composed of a smooth friction model and a fractional derivative Zener model in parallel to represent the viscoelastic properties of the bellows. It is concluded that the simulation results of the proposed new model are in good agreement with the experimental data. The new refined model may be an effective tool for predicting the mechanical behaviours of a convoluted air spring before a prototype is constructed. The proposed refined model can also be practically utilized as a guide for designing the parameters and for matching the air suspension of the vehicle.

show abstract

Modelling rolling-lobe air springs

Cited by 18 publications

References 3 publications

Comparing the performance of suspension system of semi-trailer truck with two air suspension systems

Comparing the performance of suspension system of semi-trailer truck with two air suspension systems

A Noise-Insensitive Semi-Active Air Suspension for Heavy-Duty Vehicles with an Integrated Fuzzy-Wheelbase Preview Control

Theoretical modelling and experimental analysis of the vertical stiffness of a convoluted air spring including the effect of the stiffness of the bellows

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