Evaluation of the influence of friction in a multi-leaf spring on the working conditions of a truck driver

Abstract

This article presents a simulation study of the suspension system in a vehicle that weighs approximately 12 tons (class N2). The authors have tested the influence of experimentally determined values of friction coefficients on the energy dissipated in the multi-leaf spring. The study was carried out using finite element analysis with LS-DYNA software. A nonlinear vibration model of the complete spring was developed, including the variable friction forces between the leafs. The model takes into account the sprung and unsprung mass of the chassis. Numerical tests were carried out using three different coefficients of friction (determined experimentally) for a selected speed of the car. Random realizations of the road micro-profile (type A, B, C) recommended by ISO 8608 were used. The results of the tests were presented in the form of acceleration curves in the vertical direction, comparative plots of daily vibration exposure A(8) and vibration transmission coefficient (T), and the distributions of RMS acceleration in frequency of one-third octave bands. This data was used to assess the quality of the vibration isolation system between the front suspension of the vehicle and the driver’s seat.

Assessment of the effect of passenger car wheel unbalance on driving comfort

“…To assess local vibration exposure (on the steering wheel), the vector sum of frequencyweighted root-mean-square (r.m.s) acceleration (vibration total value) a hvi and 8-hour vibration exposure is calculated according to [7,8,13]. For each measurement, the value of a hvi is calculated according to the relation (1): Perception and annoyance of vibrations generated by means of transport are subjective in nature [5].…”

Analysis of the end-of-life the front suspension beam of a vehicle

“…Engineers of automotive industry components of suspension systems by using, modern engineering materials (…) [27], new components (…) [2,[22][23] or manufacturing technology (…) [3]. They efforts are also focused on of vibrations in the suspension system on the driver's working conditions [7]. In [6], the authors analysed the possibility of using electric motors in vehicle wheels.…”

Quasi-static research of cornering stiffness for selected tires of UTV/ATV vehicles

“…Its construction and the materials used affect, among others, traction and controllability of the vehicle, especially in critical conditions of its motion [1,2]). It is also an important, next to the suspension [3], an elastic-damping element that codecides on the driving comfort and car movement of the car in various road conditions [4]. The pneumatic tire is the most common type of tire today.…”