A sliding mode control strategy for active horizontal seat suspension under realistic input vibration

Abstract

In the paper, an innovative active control of a horizontal seat suspension system is discussed in context of realistic input vibration that occurs in the cabins of agricultural tractors. The vibration reduction system is represented by the state-space model and its numerical parameters are determined experimentally. For such a reliable mathematical representation of the system dynamics, the finite-time sliding mode controller is successfully designed for different spectral classes of the random excitation signal. A multi-objective control strategy is implemented in order to satisfy opposite requirements, that is, at the limited value of active force, a horizontal vibration of the seated human body is considerably reduced, but the suspension travel does not exceed unacceptable stroke of the system. Laboratory measurements of the seated human body have shown improved comfort of drivers under fore-and-aft vibrations.

Study of a horizontal seat suspension with a model of the seated human body and energy recovery braking subsystem

“…4b). Its task was, on the one hand, to generate an active vibration damping force in accordance with the selected algorithm in the control strategy (one of the control algorithms developed by the authors was presented in the work (Maciejewski et al, 2022a), and, on the other hand, to obtain seat vibration energy and convert it into electrical energy, in accordance with the energy acquisition strategy. On the test stand, the energy of the seat movement (longitudinal vibrations) was transferred to the motor through a system of rigid rods and an eccentric system (centrifugal transfer of motion from the seat to the BLDC motor -Fig.…”

Nonlinear controller supported by artificial intelligence of the rheological damper system reducing vibrations of a marine engine

“…PID controllers are commonly used in industry because they rely solely on the evaluated variables of a dynamical system. 16,17 On the other hand, fuzzy controllers provide a flexible method to account for the impact of the interaction of the various system inputs by applying rule sets based on the occurrences of different events in the system. Given the benefits of PID and rule-based controllers, two ways have been developed for implementing Fuzzy-PID hybrids in a suspension system: (1) Utilizing fuzzy controllers to tune the PID parameters or (2) using the control techniques separately in the system to provide better vibration reduction.…”

Three-dimensional modelling and parameter identification of the seated human body exposed to random vibration

“…Two-dimensional models Qin, 2020, 2021), with up to several degrees of freedom are additionally employed for investigating kinematics of the human physique. They are used in various sport disciplines to study specific movements (Maciejewski et al, 2022), for which only individual parts of the human body are modelled. They are also used to carry out analyses covering the entire human body.…”

“…Experimental study of the biodynamic responses of the human physique can aid in comprehending the impacts of vibrations on drivers and as a result to enhance the suspension control strategy. For this purpose, many control methods are employed for enhancement of the operator comfort through semi-active (Maciejewski et al, 2019) and active seat suspension systems (Maciejewski et al, 2022). The aim of this paper is to put forth a bio-mechanical representation of the human physique while seated, which can be used for simulation studies of the effects of vibration on the drivers and to determine vibration isolation characteristics of automotive seat suspension systems.…”