| Summary: | 碩士 === 國立屏東技術學院 === 機械工程技術研究所 === 84 === This thesis presents an analytical model for the evaluation
of ride quality of tractor and trailer moving on an irregular
road surface. The tractor and trailer bodies are assumed to be
rigid and subjected to the vertical and pitch response only.
The suspension systems are considered to be linear viscouslly-
damped spring elements. The tires are assumed to be linear
viscouslly-damped and vL elastic models respectively. The
vehicle is assumed to be symmetric along the moving direction.
The wheel axle is modeled as an unsprung mass unit. Two full
tractor and trailer riding models are developed and assumed to
have the same displacement inputs of stationary ergodic Gaussian
random road profile. The frequency response functions of the
two systems are derived so as to determine the power spectral
density functions of the system response. A conventional
tractor and trailer is then used to simulate the vehicle
response, and so forth the ride quality can be studied. The
ride comfort of the driver is evaluated in comparison to the
ISO 2631. The suspension travel, road holding, dynamic tire
force and the tractor and trailer body accelerations that can
affect the ride quality of parts and cargo are also studied for
the two vehicle models. The effects of the vehicle speeds, road
roughness and laden conditions on ride quality are
systematically evaluated. The analysis of means (ANOM) is also
applied to the system parameter analysis to study their inter-
reactions and select the sub-optimum values.
keywords: Full Tractor and Trailer, Vehicle Model, Viscoelastic
Tire, Random Vibration, Suspension Travel.
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