卡车驾驶室悬置的论文.pdf

Effects of Frame Design and Cab Suspension on the
Ride Quality of Heavy Trucks

Paul Stephen Patricio

Thesis submitted to the Faculty of the
Virginia Polytechnic Institute and State University
in partial fulfillment of the requirements for the degree of
Master of Science
in
Mechanical Engineering


Approved:


________________
Mehdi Ahmadian
Chairman

______________ _____________
Daniel J. Inman Donald J. Leo


July 3, 2002
Blacksburg, Virginia


Keywords: Cab Suspension, Heavy Truck, Frame, Test Analysis, Ride
Effects of Frame Design and Cab Suspension on the
Ride Quality of Heavy Trucks
by
Paul Stephen Patricio
Mehdi Ahmadian, Chairman
Mechanical Engineering
Frame and cab suspension designs of Class 8 heavy trucks were investigated to see their
effects on fort. Four trucks were used in this study, each with a different frame: a
factory low frame, a lightweight low frame, a factory high frame, and a lightweight high frame.
There were two different frame heights and three thicknesses. Two different rear cab suspensions
were also tried out on each truck. Both suspensions used two airsprings and two dampers
mounted vertically to control the vertical motion. The first suspension used two horizontally
mounted dampers to control the lateral motion, while the second used a panhard rod connected to
a torsion spring. In addition, two different sets of airsprings and two sets of vertical shocks were
tried with each suspension, giving eight binations.
The trucks were shaken through the forward drive (second) axle using two 5500 lb
hydraulic actuators with displacement control. The steering (first) axle was left in contact with
the ground (through the tires) and the rear drive (third) axle was strapped to the truck’s frame
and acted solely as dead weight. The actuators were given various inputs including single
frequency sinusoidal signals, step signals, and