Analysis and Optimisation of Ride Vibration of a Heavy-Duty Truck Based on a Vertical-Pitch-Roll Driver-Vehicle Coupled Dynamic Model

Peng Guo,Zefeng Lin,Jinlu Li,Tao Zhang,Jiewei Lin,Chi Liu,Manuel Aenlle Lopez

doi:10.1155/2021/6695639

Abstract

The ride comfort and the cargo safety are of great importance in the vibration design of heavy-duty vehicle. Traditional ride comfort design method based on the response of components of vehicles or interaction between human and seat overlooks the most direct criterion, the response of occupants, which makes the optimisation not targeted enough. It will be better to conduct the ride comfort design with the biodynamic response of driver. To this end, a 17-degrees-of-freedom (DOFs) vertical-pitch-roll vehicle dynamic model of a three-axle heavy-duty truck coupled with a 7 DOFs human model is developed. The ride comfort of human body under the vertical, the pitch, and the roll vibrations can be evaluated with the weighted root-mean-square (r.m.s.) acceleration of the driver in multiple directions. The flexibilities of chassis and carriage are also considered to improve the accuracy of the prediction of the ride comfort and to constrain the mounting optimisation of cab and carriage. After validation, the sensitivity analysis of the mounting system, the suspensions, and arrangement of sprung masses is carried out and significant factors to ride vibration are identified. The optimal combination of design parameters is obtained with the objective of minimizing the vibration of the driver and carriage simultaneously. The optimisation result shows that the weighted driver vibration is reduced by 27.9% and the carriage vibration is reduced by 31.8% at various speeds.

Highlights

As the requirements for the ride comfort performance of vehicles increase, the human factor to the vibration design is attracting more and more attention especially for a longdistance transport [1]
Dynamic simulation is considered as an effective approach in vibration design of vehicles
It was illustrated that the loading condition had considerable effect on vibration modes of vehicle, and the ride performance could be adjusted through the design of seat suspension [5]

Summary

Introduction

As the requirements for the ride comfort performance of vehicles increase, the human factor to the vibration design is attracting more and more attention especially for a longdistance transport [1]. Dynamic simulation is considered as an effective approach in vibration design of vehicles. A driver-seat-cab model considered the interaction caused by seat suspension was developed to represent the vertical vibration of the driver. To consider the rotational vibration, the present driver-seatvehicle model needs expansion in rotational DOFs. To consider the rotational vibration, the present driver-seatvehicle model needs expansion in rotational DOFs Under this consideration, a seated human model considering vertical and pitch motions at the same time would help understanding the complex ride comfort caused by transportation vibration. A coupled driver-vehicle dynamic model in vertical-roll-pitch directions is developed to comprehensively analyse the ride comfort in translational and rotational directions. With a surrogate model of ride prediction, the driver comfort and the acceleration r.m.s. of the carriage are optimised together under various travelling speeds

Dynamic Models

Results and Discussion

Design variable

Conclusions

Disclosure