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Contribution of using Vibration Diagnostic Tools in Assessing the Condition of Gear Elements in Off-Road Vehicle Gearboxes Cover

Contribution of using Vibration Diagnostic Tools in Assessing the Condition of Gear Elements in Off-Road Vehicle Gearboxes

Measurement Science Review
Volume 25 (2025): Issue 2 (April 2025)
By: Aleksandar Djuric,  Sreten Peric,  Momir Drakulic,  Aleksandar Bukvic and  Snezana Jovanovic  
Open Access
|May 2025

Figures & Tables

Fig. 1.

Conversion of analog to digital signal.
Conversion of analog to digital signal.

Fig. 2.

Block diagram of the vibration diagnostic method.
Block diagram of the vibration diagnostic method.

Fig. 3.

Gearbox type 6MS 80: 1 – gearbox housing, 2 – input shaft, 3 – exit shaft, 4 – intermediate shaft, 5 – shaft for gear engagement, 6 – side cover, 7 – back cover, 8 – oil filler cap, 9 – forks, 10 – longitudinal fork support, 11 – pusher, 12 – carrier, 13 – flange.
Gearbox type 6MS 80: 1 – gearbox housing, 2 – input shaft, 3 – exit shaft, 4 – intermediate shaft, 5 – shaft for gear engagement, 6 – side cover, 7 – back cover, 8 – oil filler cap, 9 – forks, 10 – longitudinal fork support, 11 – pusher, 12 – carrier, 13 – flange.

Fig. 4.

Measurement device and vehicle FAP 1118, 4×4.
Measurement device and vehicle FAP 1118, 4×4.

Fig. 5.

Measurement chain diagram for vibration measurement on a vehicle gearbox.
Measurement chain diagram for vibration measurement on a vehicle gearbox.

Fig. 6.

The acceleration signal over time, for third gear ratio, accelerometer 1.
The acceleration signal over time, for third gear ratio, accelerometer 1.

Fig. 7.

Frequency spectrum, sensors 1 and 4.
Frequency spectrum, sensors 1 and 4.

Fig. 8.

Logarithm of frequency spectrum, sensors 1 and 4.
Logarithm of frequency spectrum, sensors 1 and 4.

Fig. 9.

Logarithm of the harmonics from gear mesh frequencies.
Logarithm of the harmonics from gear mesh frequencies.

Fig. 10.

Intermediate shaft speed harmonics.
Intermediate shaft speed harmonics.

Fig. 11.

Input shaft speed harmonics.
Input shaft speed harmonics.

Fig. 12.

Harmonics of the gear mesh frequency of permanent gears.
Harmonics of the gear mesh frequency of permanent gears.

Fig. 13.

Sidebands around the third gear mesh frequency.
Sidebands around the third gear mesh frequency.

Fig. 14.

Waterfall diagram of the signal from sensor 4.
Waterfall diagram of the signal from sensor 4.

Fig. 15.

The acceleration signal over time, third gear ratio, sensor 1, test 1.
The acceleration signal over time, third gear ratio, sensor 1, test 1.

Fig. 16.

Comparative logarithmic representation of the frequency spectrum, sensors 1 and 4.
Comparative logarithmic representation of the frequency spectrum, sensors 1 and 4.

Fig. 17.

Gear coupling frequency harmonics in constant coupling on the intermediate shaft.
Gear coupling frequency harmonics in constant coupling on the intermediate shaft.

Fig. 18.

Sidebands around the gear mesh frequency.
Sidebands around the gear mesh frequency.

Fig. 19.

Waterfall diagram, sensor 1, test 1.
Waterfall diagram, sensor 1, test 1.

Fig. 20.

Acceleration signal in time, sensors 1.
Acceleration signal in time, sensors 1.

Fig. 21.

The logarithm of the frequency spectrum, sensors 1 and 4, test 2.
The logarithm of the frequency spectrum, sensors 1 and 4, test 2.

Fig. 22.

Comparative frequency spectrum, test 1 and test 2, sensor 4.
Comparative frequency spectrum, test 1 and test 2, sensor 4.

Fig. 23.

The gear in third gear ratio of the gearbox on the output shaft.
The gear in third gear ratio of the gearbox on the output shaft.

Fig. 24.

The gear in third gear ratio of the gearbox after tests.
The gear in third gear ratio of the gearbox after tests.

6MS 80_P28 gearbox main characteristics_

GearIIIIIIIVVVI
Couple50/1236/1532/2226/2724/3619/41
Gear ratio95.183.142.081.441
ωout [rpm]22238663796213892000
fout [Hz]3.76.410.61623.1533.3
Gm [rpm/Hz]11100/18513896/23020381/34025000/41733336/55638000/634

Third gear harmonics of conjunction frequency values_

HarmonicFrequency [Hz]Level [m/s2]
1318.8110.1
2637.596.9
3956.387.0
41275.090.5
51593.888.6
61912.590.2
72231.388.0
82550.093.0
92868.897.9
103187.595.1
113506.397.0
123825.095.5
134143.893.1
144462.585.3
154781.385.2

Sideband level around the gear mesh frequency of the third gear ratio_

HarmonicFrequency [Hz]Level [m/s2]
−4318.8110.1
−3637.596.9
−2956.387.0
−11275.090.5
01593.888.6
11912.590.2
22231.388.0
32550.093.0
42868.897.9
DOI: https://doi.org/10.2478/msr-2025-0008 | Journal eISSN: 1335-8871
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Language: English
Page range: 53 - 63
Submitted on: Aug 8, 2024
|
Accepted on: Mar 21, 2025
|
Published on: May 1, 2025
Published by: Slovak Academy of Sciences, Institute of Measurement Science
In partnership with: Paradigm Publishing Services
Publication frequency: Volume open
Keywords:
vibrations,
vibration diagnostic,
gears,
signal,
vehicle
Related subjects:
Engineering,
Electrical engineering,
Control engineering, metrology and testing

© 2025 Aleksandar Djuric, Sreten Peric, Momir Drakulic, Aleksandar Bukvic, Snezana Jovanovic, published by Slovak Academy of Sciences, Institute of Measurement Science
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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