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Sheet 5

The document outlines tasks related to vehicle dynamics for engineering students at Minia University. It includes calculations for stability diagrams and natural frequencies for different truck configurations, as well as vibration analysis for a car based on road wave lengths. The tasks are intended for 4th-year students in the Automotive and Tractor Department.

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30 views1 page

Sheet 5

The document outlines tasks related to vehicle dynamics for engineering students at Minia University. It includes calculations for stability diagrams and natural frequencies for different truck configurations, as well as vibration analysis for a car based on road wave lengths. The tasks are intended for 4th-year students in the Automotive and Tractor Department.

Uploaded by

youssefkamalabdelrazik
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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1

Automotive and Tractor Dept. Vehicle Dynamics.


Faculty of Engineering. 4th Year.
Minia University. Sheet No.5 Code: AT 415

1. A 3.5 tons unladen 2-axles truck, pay load 2.5 ton, 2700 mm wheelbase
has the following suspension data:
Front Rear
Unladen 40% 60%
Laden 50% 50%
Unsprung mass, kg 190 310
Suspension
1170 1860
Stiffness/spring, N/cm
Tire Stiffness/spring, 3200
3200
N/cm Double tire

Plot the stability diagram showing the body and axle resonance
frequencies for both laden and un laden conditions.

2. 3-axles 13 tons laden weight truck, 3310 mm wheelbase, weight


distribution 40% & 60% front and rear respectively, un-sprung masses 750
& 1375 kg for front and rear respectively, front spring stiffness 590 N/cm
and each rear spring stiffness 1570 N/cm (tandem suspension for rear axle
i.e. common spring for both rear axle) radial stiffness of any tire 6500
N/cm. Determine
I. Partial natural frequency of equivalent front and rear sprung masses,
front and rear un-sprung masses
II. Illustrate on a road wave profile length versus speed diagram the
stable zone as limited by low and high resonance frequency and
minimum, maximum speed (5-80) Km/hr. for this truck.

3. Determine the type of vibration for 2000 kg car, with wheelbase 2700
mm, wheel truck 1350 front if the road waves length are (1350, 1500,
1800, 2700, 4500, 5400 mm).

With my best wishes


Prof.Dr. Ali. M. Abd-El-Tawwb.
1
Eng. Ebram Fayez

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