Design Optimization of Quarter-car Models with Passive and Semi-active Suspensions under Random Road Excitation

Verros, George D.; Natsiavas, S.; Papadimitriou, Costas

doi:10.1177/1077546305052315

Cited by 200 publications

(155 citation statements)

References 18 publications

(9 reference statements)

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“…For simplicity, the excitation to the system was predefined as a sinusoidal wave, and as such this can be considered as the fundamental element of a more complex and realistic road profile excitation, although the primary motion of a vehicle suspension system often closely resembles such a simple form [30]. The velocity v(t) of this input can be represented:…”

Section: Vibration Excitationmentioning

confidence: 99%

A novel fault diagnosis method for rotating machinery based on S transform and morphological pattern spectrum

Gao

Wang

Zhang

et al. 2015

J Braz. Soc. Mech. Sci. Eng.

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Abstract:To improve vehicle fuel economy whilst enhancing road handling and ride comfort, power generating suspension systems have recently attracted increased attention in automotive engineering. This paper presents our study of a regenerative hydraulic shock absorber system which converts the oscillatory motion of a vehicle suspension into unidirectional rotary motion of a generator. Firstly a model which takes into account the influences of the dynamics of hydraulic flow, rotational motion and power regeneration is developed. Thereafter the model parameters of fluid bulk modulus, motor efficiencies, viscous friction torque, and voltage and torque constant coefficients are determined based on modelling and experimental studies of a prototype system. The model is then validated under different input excitations and load resistances, obtaining results which show good agreement between prediction and measurement. In particular, the system using piston-rod dimensions of 50-30 mm achieves recoverable power of 260 W with an efficiency of around 40% under sinusoidal excitation of 1 Hz frequency and 25 mm amplitude when the accumulator capacity is set to 0.32 L with the load resistance 20 Ω. It is then shown that the appropriate damping characteristics required from a shock absorber in a heavy-haulage vehicle can be met by using variable load resistances and accumulator capacities in a device akin to the prototype. The validated model paves the way for further system optimisation towards maximising the performance of regeneration, ride comfort and handling.

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Section: Vibration Excitationmentioning

confidence: 99%

A novel fault diagnosis method for rotating machinery based on S transform and morphological pattern spectrum

Gao

Wang

Zhang

et al. 2015

J Braz. Soc. Mech. Sci. Eng.

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“…Samples of the random road profile are generated using the spectral representation method (Verros et al 2005). For brevity, only the comparison on acceleration response under random road with roughness of E Grade (Very Poor) according to ISO 2631 standards and vehicle speed 60 km/h is shown in Figure 9, where static output feedback controller uses seat suspension displacement and velocity as feedback signals.…”

Section: Vibration Control Of Vehicle Seat Integrating With Chassis Smentioning

confidence: 99%

Vibration Control of Vehicle Seat Integrating with Chassis Suspension and Driver Body Model

Zhang

2013

Advances in Structural Engineering

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Vehicle seat suspension is one of very important components to provide ride comfort, in particular, commercial vehicles, to reduce driver fatigue due to long hours driving. This paper presents a study on active control of seat suspension to reduce vertical vibration transmitted from uneven road profile to driver body. The control problem will be firstly studied by proposing an integrated seat suspension model which includes vehicle chassis suspension, seat suspension, and driver body model. This is a new concept in the field of study because most of the current active and semi-active seat suspension studies only consider seat suspension or seat suspension with human body model, and road disturbance is generally assumed to be applied to the cabin floor directly. Controller design based an integrated model will enable the seat suspension to perform in a scenario where vibration caused by road disturbance is transmitted from wheel to seat frame and ride comfort performance is evaluated in terms of human body instead of seat frame acceleration. A static output feedback controller is then designed for the seat suspension with using measurement available signals. Driver mass variation and actuator saturation are also considered in the controller design process. The conditions for designing such a controller are derived in terms of linear matrix inequalities (LMIs). Finally, numerical simulations are used to validate the effectiveness of the proposed control strategy. It is shown from the driver body acceleration responses under both bump and random road disturbances that the newly designed seat suspension can improve vehicle ride comfort regardless of driver body mass variation.

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“…A methodology for optimizing the suspension parameters for quarter car models was presented by Verros et al (2005). Rao et al (2010) have analyzed the passive and active controlled suspension systems in an omnibus passing over a speed bump.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis using state space method for vibration control of car seat by employing passive and semi active dampers

Kotagi¹,

Raju²,

Patil³

et al. 2016

Int. J. Eng. Sci. Tech

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In passenger cars the vibrations developed at the ground are transmitted to the passengers through seats. Due to vibrations discomfort is experienced by the passengers. Dampers are being successfully utilized to reduce the vibrations in civil engineering structures. Few dampers are used in passenger cars as well. In the present study viscous dampers and semi-active variable friction dampers are used in passenger cars. The car and car seat are modeled together as two degrees of freedom system. The study is carried out for two cases namely car moving on sagged bridges and car moving on road humps. The paper also presents the comparison of performance of both the dampers for the two cases. State space method has been employed for the numerical analysis of the study. It is found that the amplitude of displacements is reduced considerably by the employment of dampers and resonance is avoided. Performance wise viscous damper is found to be slightly better than semi-active variable friction damper.

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Design Optimization of Quarter-car Models with Passive and Semi-active Suspensions under Random Road Excitation

Cited by 200 publications

References 18 publications

A novel fault diagnosis method for rotating machinery based on S transform and morphological pattern spectrum

A novel fault diagnosis method for rotating machinery based on S transform and morphological pattern spectrum

Vibration Control of Vehicle Seat Integrating with Chassis Suspension and Driver Body Model

Numerical analysis using state space method for vibration control of car seat by employing passive and semi active dampers

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