Semiactive Suspension: A Field Testing Case Study

Saxon, Nancy L.; Meldrum, William R.; Bonte, Tyrone K.

doi:10.4271/981119

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Giliomee and Els [2] analyzed the rigidity and damping characteristics and the random input responses of a hydropneumatic suspension with a double-gas-chamber spring unit for heavy off-road vehicles and the effects of the damping and rigidity on the overall performance of the hydropneumatic suspension, thereby improving the ride quality and maneuverability of heavy off-road vehicles. Regarding the kinetic characteristics of a semi-active hydropneumatic suspension, Saxon et al [3] investigated the Bradley Fighting Vehicle of the US Army, established a test system for the hydropneumatic suspension and associated piping, computer controller, and dynamic track tensioner, and proposed a method for the continuous adjustment of the damping of caterpillar vehicles. Theron and Els [4] established a damping model for a semi-active hydropneumatic spring suspension with a two-stage damping system by employing linear fluid mechanics theory, calculating the pressure in the accumulators through the integral calculations of the flow rates to the hydraulic cylinder, and using the damping force of the hydropneumatic suspension unit as the output of the model.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulation and Optimization of Hydropneumatic Spring Damper Valves for Heavy Vehicle Applications

Nie

Sha

et al. 2023

Machines

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To satisfy the design requirements for a hydropneumatic spring damper valve, the inlet–outlet pressure drop (ΔP) and the axial force on the spool (FZ) of a valve were investigated using fluid–solid coupling simulations and multi-objective optimization, along with the effects of the diameters of three internal holes (DA, DB, and DC) in the valve on the ΔP and the FZ. First, a meshed computational fluid dynamics model of a damper valve was established based on its geometric structure. Next, the effects of the flow rate (Q) and the diameter of the damping hole in the internal structure on the ΔP and the FZ of the damper valve were investigated. The results showed that the ΔP and the FZ varied nonlinearly with Q. For a given Q, the ΔP decreased as DA, DB, and DC increased. For a given Q, the FZ was not related to DA and DC, but it decreased as DB increased. Finally, the structure of the damper valve was optimized by defining the ΔP and the FZ as the response variables and DA, DB, and DC as the explanatory variables. The results showed that the best configuration of the hole diameters was DA = 8.8 mm, DB = 5.55 mm, and DC = 6 mm. In this configuration, ΔP = 0.704 MPa and FZ = 110.005 N. The ΔP of the optimized valve was closer to the middle value of the target range than that of the initial valve design. The difference between the simulated and target values of the FZ decreased from 0.28% to 0.0045%, satisfying application requirements.

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Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulation and Optimization of Hydropneumatic Spring Damper Valves for Heavy Vehicle Applications

Nie

Sha

et al. 2023

Machines

View full text Add to dashboard Cite

show abstract

“…vehicles based on their ability to improve ride comfort. The authors examined several control strategies and Saxon et al [10] con rmed through eld testing that ride quality and stability are the greatest advantages concluded (on the basis of simulation results) that the semiactive systems are able to improve ride comfort of using a semiactive suspension. Giua et al [11] presented a two-phase design tech-without sacri cing driving safety.…”

Section: Introductionmentioning

confidence: 99%

An alternative semiactive control method for sport utility vehicles

Simon

Ahmadian

2002

Proceedings of the Institution of Mechanical Engineers, Part D:

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Many investigators have predicted that the performance gains attainable with a semiactive suspension are comparable with those possible with a fully active suspension. To achieve this, one of the crucial factors is the method by which the damper is controlled. This study is an investigation, through simulation, into the effectiveness of a number of basic control strategies in controlling vehicle dynamics, particularly roll. In addition, this study examines the effect of changing the vehicle mass on the effectiveness of selected semiactive control policies. The model represents a sport utility vehicle (SUV), a class of vehicles that regularly sees widely varying vehicle weight and exhibits undesirable levels of vehicle roll. In this study, a four-degree-of-freedom vehicle roll plane model is subjected to a variety of road- and driver-induced inputs, and the vehicle response with different semiactive control policies is characterized. The semiactive control policies investigated are tuned and modified such that the best possible performance with each is attained, and then they are compared. In addition, the effect of variations in vehicle weight on the performance of each semiactive control method is investigated. In this investigation, two basic skyhook control strategies are investigated, and two modified strategies are proposed. It is found that the performance achievable with each of the different control strategies is heavily dependent on the properties of the controllable damper. The properties that were particularly important were the upper and lower levels of force that the controllable damper was able to apply. The controllable dampers were tuned for each control system, and the results indicate that a velocity-based skyhook control policy, in conjunction with force control, is most effective at controlling both road-induced vibration and driver-induced roll. Furthermore, the results show that such a control policy is relatively insensitive to variations in vehicle weight.

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Magneto-Rheological Fluid Semiactive Suspension System Performance Testing on a Stryker Vehicle

Wray¹,

Jimenez²,

Anderfaas³

et al. 2006

SAE Technical Paper Series

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Semiactive Suspension: A Field Testing Case Study

Cited by 3 publications

References 3 publications

Computational Fluid Dynamics Simulation and Optimization of Hydropneumatic Spring Damper Valves for Heavy Vehicle Applications

Computational Fluid Dynamics Simulation and Optimization of Hydropneumatic Spring Damper Valves for Heavy Vehicle Applications

An alternative semiactive control method for sport utility vehicles

Magneto-Rheological Fluid Semiactive Suspension System Performance Testing on a Stryker Vehicle

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