Editorial Type:
Article Category: Research Article
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Online Publication Date: 01 Apr 2017

Motorcycle Analytical Modeling Including Tire–Wheel Nonuniformities for Ride Comfort Analysis

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Page Range: 101 – 120
DOI: 10.2346/tire.17.450202
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ABSTRACT

The transmission of vibrations in motorcycles and their perception by the passengers are fundamental in comfort analysis. Tire nonuniformities can generate self-excitations at the rotational frequency of the wheel and contribute to the ride vibration environment. In this work a multi-body motorcycle model is built to evaluate the ride comfort with respect to tire nonuniformities. The aim is to obtain a multi–degrees-of-freedom dynamic model that includes both the contributions of the motorcycle and tire–wheel assembly structures. This representation allows the tire nonuniformities to predict the vertical force variations on the motorcycle and can be used through a root mean square acceleration evaluation for ride comfort analysis. The motorcycle model proposed is a 10-degrees-of-freedom system, where each tire–wheel is a 4-degrees-of-freedom model. The tire–wheel assemblies include two types of nonuniformities: lumped mass imbalance and radial run-out. Simulations of analytical models are compared with experimental tests.

Keywords: tire–wheel model; motorcycle model; motorcycle tire nonuniformity; radial run-out; lumped mass imbalance; ride comfort
FIG. 1
FIG. 1

10 DOF motorcycle model.

FIG. 2
FIG. 2

Saddle vertical acceleration of (a) motorcycle model, (b) reference model [11].

FIG. 3
FIG. 3

Tire mass imbalance model.

FIG. 4
FIG. 4

Tire eccentricity model.

FIG. 5
FIG. 5

Tire out-of-roundness model.

FIG. 6
FIG. 6

Sprung mass time domain response for mass imbalance analysis.

FIG. 7
FIG. 7

Sprung mass time domain response for eccentricity nonuniformity.

FIG. 8
FIG. 8

Sprung mass time domain response for out-of-roundness nonuniformity.

FIG. 9
FIG. 9

ISO 2631 reduced comfort boundaries and sprung mass acceleration RMS.

FIG. 10
FIG. 10

Points of measurements for the experimental tests on the motorcycle.

FIG. 11
FIG. 11

(a) Motorcycle experimental tests. (b) Motorcycle analytical model simulations.

FIG. 12
FIG. 12

First three vertical mode shapes of the front tire.

Contributor Notes

1 Corresponding author. Faculty of Mechanical Engineering, 200 Rua Mendeleyv, Campinas, São Paulo, 13083-860, CP 6122, Brazil. Email: matheusvallim@gmail.com
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