Sensitivity Analysis of a Driver’s Lumped Parameter Model in the Evaluation of Ride Comfort

Abstract

The ride comfort provided by a vehicle to the driver and the passengers is an important feature, directly correlated to the technical characteristics of the suspension system of the vehicle. In the literature, several lumped-parameter models simulating the vehicle and the driver are proposed for the computational evaluation of ride comfort. In order to quantify ride comfort, other than the values of acceleration, metrics such as seat effective amplitude transmissibility (SEAT) and seat-to-head transmissibility (STHT) are utilized. In this paper, a quarter car model is coupled with a six-degree-of-freedom lumped-parameter model, consisting of the driver’s seat and the driver. A sensitivity analysis is performed on the values of the lumped parameters of the seated human body with regard to ride comfort in order to evaluate the effect of their accuracy relative to the ride comfort evaluation. The results of the sensitivity analysis revealed that the values of the mass, the stiffness and the damping parameters of the seated human model influence the ride-comfort metrics to a different extent. Furthermore, it was depicted that ride-comfort metrics were affected in different manners depending on the characteristics of the excitation of the vehicle, yet less than 10% Finally, the importance of the consideration of single-disturbance excitations in such sensitivity studies emerged.

Review on Semi Active Suspension System for Ride Comfort

“…The section examines objective and subjective measurements of ride comfort that will explore many approaches used to evaluate the quality of a vehicle's ride experience. Objective metrics refer to quantitative measures, including frequency response analysis, displacement, acceleration, and velocity assessments [21], [22]. These data provide technical insights into the physical functioning of the suspension system.…”

Modelling a Loop Heat Pipe as Heat Switch for Transient Application in Space Systems

“…This functionality is achieved by enabling the control of the temperature differential between the evaporator and the compensation chamber, as described in [20,21]. To implement it, a 1D thermo-hydraulic lumped parameter model mathematical model, as in [22][23][24][25][26][27][28][29][30], capable of predicting design and thermal performance, is necessary. This model should account for transient responses, complex interactions involving two-phase fluid flow, heat transfer, flow through porous structures, dry-out and priming phenomena, as well as condensation and evaporation within the loop heat pipe.…”

“…This paper, which aims to develop a 1D thermo-hydraulic lumped parameter model [22][23][24][25][26][27][28][29][30] for a loop heat pipe working as a heat switch, is organized as follows: Section 2 presents the mathematical model of the loop heat pipe working as a heat switch, Section 3 focuses on the dimensioning parameters, such as geometry and fluid properties, which are used in the simulations, and the corresponding results are presented in Section 4. Section 5 involves a discussion on the challenges and achievements from the proposed model.…”

The Analysis of Stiffness and Driving Stability in Cross-Member Reinforcements Based on the Curvature of a Small SUV Rear Torsion Beam Suspension System

“…Donghui et al [17] analyzed ride comfort according to age group and reported that at speeds of 30-70 km/h, child seats encounter greater acceleration, resulting in reduced comfort. Kobayashi et al [18] analyzed ride comfort according to posture; anthropometric accuracy was studied using a sitting human model through lumped parameters with 4 degrees of freedom. Jung et al [19] conducted research on improving regenerative braking efficiency in electric vehicles.…”