Abstract
In this study, to improve the vibration isolation performance of a cab seat and the ride comfort of the driver, we propose a mathematical model for a seat suspension system of a construction machinery cab based on a negative stiffness structure (NSS). First, a static analysis of a seat suspension system is conducted and the different parameters and their influences on the dynamic stiffness are discussed. Thereby, the ideal configuration parameter range of the suspension system is obtained. Moreover, the nonlinear dynamic model of the designed seat suspension system is established. The frequency response and the stability are analyzed by using the HBM method and numerical simulation. The vibration transmissibility characteristics and vibration suppression effects of the seat suspension system are presented in detail. The results show that, as compared with a quasi-zero-stiffness system, the QZS-IE system has higher vibration suppression advantages under large excitation and small damping, as well as lower transmissibility and a wider vibration isolation frequency range. In addition, an inerter element with a larger mass ratio and relatively shorter distance ratio is better for vibration isolation performance of the QZS-IE system in a practical engineering application. The results of this study provide a scientific basis for the design and improvement of a seat suspension system.
Highlights
In recent years, with road traffic continuously improving, more and more attention has been given to ride comfort and human-centered design of vehicle seats, especially, construction machinery such as modern construction transport vehicles, in which cab seats vibrate with various degrees during vehicle operation [1]
The vibration isolation mechanism of a parallel spring with a negative stiffness structure is a new type of nonlinear vibration isolation device which can significantly improve the vibration isolation effect, especially the low-frequency vibration isolation effect
The static analysis and dynamic analysis of a cab seat suspension system based on a negative stiffness structure are presented
Summary
With road traffic continuously improving, more and more attention has been given to ride comfort and human-centered design of vehicle seats, especially, construction machinery such as modern construction transport vehicles, in which cab seats vibrate with various degrees during vehicle operation [1]. Advocating for the development of a people-oriented vehicle seat suspension system that fully considers drivers’ physical feelings and strengthens the protection of drivers would improve the working environment. The vibration isolation mechanism of a parallel spring with a negative stiffness structure is a new type of nonlinear vibration isolation device which can significantly improve the vibration isolation effect, especially the low-frequency vibration isolation effect. The natural frequency could be reduced by adjusting the magnitude of force at both ends of the negative stiffness mechanism and the vibration isolation effect was improved significantly. There are few in-depth studies in the literature on the negative stiffness structure for cab seats of construction machinery vehicles. The static analysis and dynamic analysis of a cab seat suspension system based on a negative stiffness structure are presented. The results should accelerate the application of the QZS-IE system in construction machinery cab seats and improve the ride comfort of drivers
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