Improvement of Comfort in Suspension Seats with a Pneumatic Negative Stiffness System

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

doi:10.3390/act9040126

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…According to the analytical and experimental results, the resonance frequency of this structure was reduced by up to 58%, and the transmissibility modulus was increased by up to 78%. Later, when this structure was used as a vibration isolator in vehicle seats, comfort improvements ranging from 10% to 35% were observed [32]. Hence, the pneumatic vibration isolation system based on NSS achieved vibration isolation with different masses of the isolated objects.…”

Section: Introductionmentioning

confidence: 99%

An Air Spring Vibration Isolator Based on a Negative-Stiffness Structure for Vehicle Seat

Nguyen

Ahn

2021

Applied Sciences

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This research introduces an air spring vibration isolator system (ASVIS) based on a negative-stiffness structure (NSS) to improve the vehicle seat’s vibration isolation performance at low excitation frequencies. The main feature of the ASVIS consists of two symmetric bellows-type air springs which were designed on the basis of a negative stiffness mechanism. In addition, a crisscross structure with two straight bars was also used as the supporting legs to provide the nonlinear characteristics with NSS. Moreover, instead of using a vertical mechanical spring, a sleeve-type air spring was employed to provide positive stiffness. As a result, as the weight of the driver varies, the dynamic stiffness of the ASVIS can be easily adjusted and controlled. Next, the effects of the dimension parameters on the nonlinear force and nonlinear stiffness of ASVIS were analyzed. A design process for the ASVIS is provided based on the analytical results in order to achieve high static–low dynamic stiffness. Finally, numerical simulations were performed to evaluate the effectiveness of the ASVIS. The results obtained in this paper show that the values of the seat displacement of the ASVIS with NSS were reduced by 77.16% in comparison with those obtained with the traditional air spring isolator without NSS, which indicates that the design of the ASVIS isolator with NSS allows the effective isolation of vibrations in the low-frequency region.

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Section: Introductionmentioning

confidence: 99%

An Air Spring Vibration Isolator Based on a Negative-Stiffness Structure for Vehicle Seat

Nguyen

Ahn

2021

Applied Sciences

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“…In recent years, many scholars have conducted research on innovative suspensions, such as mechatronic [ 3 , 4 ], pneumatic [ 5 ], hydraulic [ 6 ], and mixed [ 7 ] suspensions. To achieve a balance between comfort and maneuverability, a nonlinear control law based on nonlinear hydraulic actuator-regulating hydraulic valves is used to provide active control force.…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Control of a Semi-Active Vehicle-Mounted Vibration Isolation Platform

Wu,

Zhang,

Yuan

et al. 2023

Sensors

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When conventional delivery vehicles are driven over complex terrain, large vibrations can seriously affect vehicle-loaded equipment and cargo. Semi-active vehicle-mounted vibration isolation control based on road preview can improve the stability of loaded cargo and instruments by enabling them to have lower vertical acceleration. A combined dynamic model including a vehicle and platform is developed first. In order to obtain a non-linear relationship between damping force and input current, a continuous damping control damper model is developed, and the corresponding external characteristic tests are carried out. Because some conventional control algorithms cannot handle complex constraints and preview information, a model predictive control algorithm based on forward road preview and input constraints is designed. Finally, simulations and real tests of the whole vehicle vibration environment are carried out. The results show that the proposed model predictive control based on road preview can effectively improve vibration isolation performance of the vehicle-mounted platform.

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Load adaptivity of the mem-spring and its performance benefits in vehicle suspensions

Nie,

Liu,

Huang

et al. 2024

Nonlinear Dyn

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Improvement of Comfort in Suspension Seats with a Pneumatic Negative Stiffness System

Cited by 7 publications

References 28 publications

An Air Spring Vibration Isolator Based on a Negative-Stiffness Structure for Vehicle Seat

An Air Spring Vibration Isolator Based on a Negative-Stiffness Structure for Vehicle Seat

Model Predictive Control of a Semi-Active Vehicle-Mounted Vibration Isolation Platform

Load adaptivity of the mem-spring and its performance benefits in vehicle suspensions

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