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2 Journal of Theoretical and Applied Mechanics

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

Maciejewski Igor, Pecolt Sebastian, Błazejewski Andrzej, Jereczek Bartosz, Krzyzynski Tomasz

Journal of Theoretical and Applied Mechanics

2024

Vol. 62 nr 2

321--335

This article explains the mechanics, control strategies and main applications of a new concept which achieves a balance between energy saving and driver comfort. A physical and mathematical model of a suspension system with energy recovery is presented. It shows practical implementation of the BLDC braking system with energy recovery in a horizontal seat suspension and a detailed simulation analysis of their features and performance. The research involves a specific solution, with a specific BLDC motor, and experimental tests on a laboratory stand. The results of the simulation study using a simplified biomechanical model and experimental studies with human participation are presented.

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

Maciejewski Igor, Błażejewski Andrzej, Pecolt Sebastian, Krzyzynski Tomasz, Zaporski Piotr

Journal of Theoretical and Applied Mechanics

2023

Vol. 61 nr 4

833--845

The paper deals with the modelling and parameter identification of the human body in a sitting posture. The advantage of this paper is to announce a simplified, but also a reliable three-mass model representing dynamic behaviour of the main human body parts, i.e. pelvis, torso and head. Their equivalent masses are interconnected by classical mechanical constraints in the form of springs and dampers. The stiffness and damping coefficients are identified by means of an original optimisation procedure that is used to minimise the error between measurement and simulation results. The model is proposed to be used for simulation studies of vibration-induced effects on the human body as well as for defining a specific vibration-isolation properties of automotive seat suspension systems with minimal computing cost and time.