Performance analysis of the seat suspension using different models of the optimal negative-stiffness-structures

Abstract

Three different models of the steel spring (SS), the roller-spring (RS), and the air spring (AS) in the negative-stiffness-structure (NSS) used for the driver’s seat suspension system are proposed to ameliorate the vehicle’s ride comfort. A vehicle dynamics model with the driver’s seat isolation system added by the SS, RS, and AS is built and simulated under the different operating conditions of the vehicle. The geometric dimensions and the dynamic stiffness coefficients of the SS, RS, and AS in the NSS are optimized by the genetic algorithm to further enhance the vehicle’s ride comfort. The performance of the optimal SS (OSS), the optimal RS (ORS), and the optimal AS (OAS) in the NSS is assessed through the weight Root-Mean-Square value of the deformation of the driver’s seat suspension system ( zwsb) and the driver’s seat acceleration response ([Formula: see text]). The research shows that with the NSS added into the driver’s seat suspension system, the driver’s ride comfort and the deformation of the driver’s seat suspension system are remarkably improved compared to the driver’s seat suspension system without the NSS. Additionally, the design parameters of the SS, RS, and AS in the NSS also significantly influence their isolation performance. With using the OSS, ORS, and OAS in the NSS, the stable result of the non-dimensional restoring force of the OAS at a variable range of the non-dimensional deformation z is smaller than both the OSS and ORS. Therefore, the OAS better improves the driver’s ride comfort compared to both the OSS and ORS. In particular, the zwsb and [Formula: see text] with the OAS are remarkably decreased by 40.05% and 36.28% compared to the OSS; and by 62.57% and 86.66% in comparison without the NSS, respectively. Therefore, the OAS in the NSS should be applied to the driver’s seat suspension system to further ameliorate the vehicle’s ride quality.

Enhancing the ride comfort of off-road vibratory rollers with seat suspension using optimal quasi-zero stiffness

“…To obtain the minimum dynamic stiffness and the stability of the QZS’s structure, the value of x 3 < 2x 2 and β ≤ 0.7 should be applied in the design process. 20,25 Whereby, the boundary conditions of QZS’s parameters are calculated and defined as follows:…”

“…Based on the advantage of the QZS and the HM proven in the existing research, 9,10,[21][22][23][24][25] a new design of the traditional seat suspension equipped with the QZS and the cab's rubber mounts replaced by the HM are proposed to reduce the vertical seat vibration and control the cab's pitching angle of the off-road vibratory roller. To assess the ride comfort of the vehicle using the QZS and the HM, a dynamic model of the off-road vibratory roller is built and researched under different interactions of the wheel/drum and deformable terrains.…”

“…11,15,20–23 Both the theory and experiment methods showed that the Root-Mean-Square (RMS) value of the driver’s seat displacement was strongly decreased by 97.6% the excitation of the harmonic function. 20,21 The influence of the design parameters of the QZS was then analyzed and optimized under the operating conditions based on the numerical simulation method and the GA. 16,24,25 The different structures of the QZS used by the steel springs, air springs, and rolling steel springs were developed to optimize the structure and isolation efficiently of the QZS. 25 The research results showed that the QZS not only had the simple structure but also reduced the vibration very efficiency compared to the traditional seat suspension system.…”

“…20,21 The influence of the design parameters of the QZS was then analyzed and optimized under the operating conditions based on the numerical simulation method and the GA. 16,24,25 The different structures of the QZS used by the steel springs, air springs, and rolling steel springs were developed to optimize the structure and isolation efficiently of the QZS. 25 The research results showed that the QZS not only had the simple structure but also reduced the vibration very efficiency compared to the traditional seat suspension system. However, the study and application of the QZS on the off-road vibratory roller has not been concerned in the existing research yet.…”

A comparative study of isolation performance of electric automobile seat’s suspension added by negative-stiffness structure models

“…Additionally, with the development of the NSS, the initial structure of the NSS designed by two symmetrical springs in the horizontal direction was embedded into the seat suspension of the vehicles. [16][17][18][19] Then, the different structures of the NSS using six oblique springs, X-structure, optic-electronic equipment, electromagnetic mechanisms, and magnetic negative stiffness dampers were also proposed to enhance the isolation performance of the seat's isolation system. [20][21][22][23] To further enhance the NSS's isolation performance, the magnetic damping in the above structures was also optimized and controlled by the optimal control algorithms.…”