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.…”

Research on Vibration Reduction Performance of Electromagnetic Active Seat Suspension Based on Sliding Mode Control

“…The results showed that the delayed resonator could greatly suppress the seat vibration response regardless of the road’s simple harmonic excitation or random excitation. Maciejewski et al [ 27 ] discussed an innovative active control for a horizontal seat suspension system in the context of realistic input vibrations that occurred in the cabins of agricultural tractors. Laboratory measurements on the seated human body have shown improved comfort of drivers under fore-and-aft vibrations.…”