Modelling Magnetorheological Dampers in Preyield and Postyield Regions

Palomares, E.; Morales, A.L.; Nieto, A.J.; Chicharro, J.M.; Pintado, P.

doi:10.1155/2019/5636053

Cited by 9 publications

(6 citation statements)

References 58 publications

(64 reference statements)

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“…These results indicate that the effect of slip sinkage should be considered when assessing the tractive performance of off-road tracked vehicles and that tractive performance can be overestimated when compaction resistance is calculated considering only static sinkage. When excessive slip sinkage is expected with a large i, it is necessary to apply a proper method to suppress the effect of slip sinkage such as unconventional track suspension systems [35][36][37][38]. The larger n and l, the larger Rc/Rc0.…”

Section: Evaluation Of Compaction Resistance Considering Slip Sinkagementioning

confidence: 99%

Evaluation of the Slip Sinkage and its Effect on the Compaction Resistance of an Off-Road Tracked Vehicle

et al. 2020

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When an off-road tracked vehicle travels, shearing action and ground sinkage occur on the soil–track interface, severely affecting the tractive performance of the vehicle. Notably, ground sinkage, which is induced by the vehicle’s weight (static sinkage) and longitudinal forces in the direction of travel producing slip (slip sinkage), develops motion resistance, directly restricting the tracked vehicle’s performance. Thus, it is critical to consider both static sinkage and slip sinkage to assess the tractive performance of a tracked vehicle. In this research, model track experiments were conducted to investigate slip sinkage. The experimental results showed that the slip sinkage increased as the slip ratio increased, but the rate of increase decreased. The slip sinkage was found to increase as the density of the ground decreased and imposed vertical load increased. The experimental results were used to calculate normalized slip sinkage, and an empirical equation for slip sinkage in terms of slip ratio was developed. This equation will allow vehicle operators to predict the slip sinkage and associated motion resistance for given soil and vehicle conditions.

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Section: Evaluation Of Compaction Resistance Considering Slip Sinkagementioning

confidence: 99%

Evaluation of the Slip Sinkage and its Effect on the Compaction Resistance of an Off-Road Tracked Vehicle

et al. 2020

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“…Recall the road vertical displacement for one wheel in time domain can be calculated with Equation (12); firstly, two road vertical displacements q1 0(t) and q2 0(t) in the time domain are generated separately, then the road excitations for four wheels can be generated with q1 0(t), q2 0(t), and the coherence transfer function above, as Figure 2a shows the generated random C-class road excitations at a 20 m/s vehicle speed. The PSD of roads for the front left and front right wheels are illustrated in log-log scale in Figure 2b, which also contains the roughness indexes information classified by ISO.…”

Section: Generation Of Road Excitationsmentioning

confidence: 99%

“…Vehicle suspensions can be classified into three types: active [3][4][5][6], semi-active [7][8][9][10][11][12], and passive [13][14][15][16]. Active suspension systems with appropriate control strategies can greatly improve both the comfort and handling, but they are expensive and consume large amounts of energy.…”

Section: Introductionmentioning

confidence: 99%

Sliding Mode Control of Laterally Interconnected Air Suspensions

Guowei

et al. 2020

Applied Sciences

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This paper presents a control method based the lateral interconnected air suspension system, in order to improve the road handling of vehicles. A seven-DOF (Degree of freedom) full-vehicle model has been developed, which considers the features of the interconnected air suspension system, for example, the modeling of the interconnected pipelines and valves by considering the throttling and hysteresis effects. On the basis of the well-developed model, a sliding mode controller has been designed, with a focus on constraining and minimizing the roll motion of the sprung mass caused by the road excitations or lateral acceleration of the vehicle. Moreover, reasonable road excitations have been generated for the simulation based on the coherence of right and left parts of the road. Afterwards, different simulations have been done by applying both bumpy and random road excitations with different levels of roughness and varying vehicle lateral accelerations. The simulation results indicate that the interconnected air suspension without control can improve the ride comfort, but worsen the road handling performance in many cases. However, by applying the proposed sliding mode controller, the road handling of the sprung mass can be improved by 20% to 85% compared with the interconnected or non-interconnected mode at a little cost of comfort.

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“…In the current design stage of MRD, a quasi-static mechanical model is typically used in conjunction with finite element simulations to predict their output damping force. Among them, significant research progress has been made in the independent simulation of single physical fields such as magnetic and fluid fields [19][20][21][22][23]. However, the mechanical characteristics of MRD are influenced by multiple physical fields.…”

Section: Introductionmentioning

confidence: 99%

Multi-Physics Simulation and Experimental Verification of Magnetorheological Damper with Additional Stiffness

Liang

Wang

et al. 2023

Actuators

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Single-rod magneto-rheological dampers (MRD) have the advantages of a simple mechanism, high reliability, and broad application range. They are widely used in various semi-active vibration control fields. However, their working mode requires a compensating mechanism to perform volume compensation on the rod, leading to additional stiffness for the system. Ignoring this point makes it tough to establish an accurate mechanical model to describe its performance in the design stage, affecting its application. To address this issue, this study proposes a multi-physics simulation model based on gas compensation for single-rod MRD to characterize their mechanical performance accurately. Firstly, the mechanism and mechanical model of the single-rod gas compensation MRD are introduced. Secondly, considering that its performance is affected by the coupling effect of multiple physical fields, including magnetic, flow, and solid mechanics fields, the control equations and boundary conditions of each field are analyzed separately, and a multi-physics coupling simulation model is established by COMSOL. In particular, the gas compensation unit is considered in the multi-physics simulation model. The effect of the compensating mechanism on the mechanical performance of the damper under different excitation speeds, currents, and initial pressures is analyzed. Finally, the accuracy of the proposed method is verified through the demonstration power test. The results show that the simulation can describe the additional stiffness in the damper. The average error between experimental value and simulation value is 7%. This demonstrates the degree of agreement between the experiment and simulation.

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Modelling Magnetorheological Dampers in Preyield and Postyield Regions

Cited by 9 publications

References 58 publications

Evaluation of the Slip Sinkage and its Effect on the Compaction Resistance of an Off-Road Tracked Vehicle

Evaluation of the Slip Sinkage and its Effect on the Compaction Resistance of an Off-Road Tracked Vehicle

Sliding Mode Control of Laterally Interconnected Air Suspensions

Multi-Physics Simulation and Experimental Verification of Magnetorheological Damper with Additional Stiffness

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