Analytical Study on the Low-Frequency Vibrations Isolation System for Vehicle’s Seats Using Quasi-Zero-Stiffness Isolator

Abstract

Improving the vibration isolation for the seat of small vehicles under low excitation frequencies is important for providing good comfort for the driver and passengers. Thus, in this study, a compact, low-dynamic, and high-static stiffness vibration isolation system has been designed. A theoretical analysis of the proposed quasi-zero stiffness (QZS) isolator system for vehicle seats is presented. The isolator consists of two oblique springs and a vertical spring to support the load and to achieve quasi-zero stiffness at the equilibrium position. To support any additional load above the supported weight, a sleeve air spring is used. Furthermore, the two oblique springs are equipped with a horizontal adjustment mechanism that is aimed to reach higher frequencies with the existed stroke when a heavy load is applied. The proposed system can be fitted for small vehicles, especially for B-segment and C-segment cars. Finally, the simulation results reveal that the proposed system has a large isolation frequency range compared to that of the linear isolator.

The Development of a High-Static Low-Dynamic Cushion for a Seat Containing Large Amounts of Friction

“…Furthermore, this model does not include the presence of friction. The proposed QZS cushion has a lower transmissibility and is more robust against changes in mass compared to the QZS air spring seat suspension model [34]. However, the QZS cushion has a higher natural frequency.…”

“…The cushion described in the current paper is able to achieve a much smaller natural frequency and therefore is able to isolate lower-frequency vibrations. This work may also be compared to Abuabiah et al [34], which presents a numerical simulation of a seat suspension composed of a QZS isolator and an air spring. It should be noted that this simulation models a larger replacement seat suspension, not a cushion.…”

Measurement of a Vibration on a Robotic Vehicle

“…The last, third variant of the arrangement of the obstacle is shown in Figure 11c. This is an asymmetric arrangement of the obstacle, where only the right front wheel of the robotic vehicle passes over the obstacle [19][20][21][22][23]. Only initial measurements are presented in this article.…”

Magnetic Negative Stiffness Devices for Vibration Isolation Systems: A State-of-the-Art Review from Theoretical Models to Engineering Applications

“…Moreover, with the increasing demand for precision and ultra-precision equipment, the significance of controlling vibration environments and optimizing working conditions has escalated for vehicles, vessels, spacecraft, and other machinery. By em-ploying a diverse array of vibration isolation materials and design methodologies, including suspension systems, shock absorbers, and acoustic insulation, the propagation of vibrations from both the interior and the exterior of the vehicle is significantly mitigated, yielding enhancements in passenger comfort and providing a quieter, smoother, and safer journey, while concurrently safeguarding vital vehicle components against potential damage [7][8][9]. In alternative contexts, even the most minute vibration may impinge upon the stealth capabilities of vessels and the operational efficiency of spacecraft [10][11][12].…”