Have a personal or library account? Click to login
Type-Approval and Qualification Testing of Air Braking Systems of Agricultural Trailers Under Stationary Conditions Cover

Type-Approval and Qualification Testing of Air Braking Systems of Agricultural Trailers Under Stationary Conditions

Acta Mechanica et Automatica
Volume 19 (2025): Issue 1 (March 2025)
By: Zbigniew Kamiński and  Jarosław Czaban  
Open Access
|Mar 2025

Figures & Tables

Fig. 1.

Diagram of the device for diagnosing two-line air brake systems of agricultural trailers and towed machines: APS - air preparation station; BA - brake actuator; CH – control coupling head; CR1 and CR2 - calibration reservoirs with volumes of 385± 5 cm3 and 1155 ±15 cm3, respectively (including its coupling head); CU – control unit; DT - displacement transducer (cable encoder); ERV – emergency relay valve; I/O Adapter - input-output adapter; L - line from orifice O up to and including its coupling head CH (having an inner volume of 385 ±5 cm3 under a pressure of 6.5 bar); M - manometer; O - calibrated orifice; PC – computer; PRN – printer; PRV - pressure reducing valve; PTi - ith pressure transducer; R - compressed air tank with a capacity of 30 litres; SH - supply coupling head; SOV - shut-off valve; SV1, SV2, and SV3 – 2/2 electrovalves (NC); SV4 – direct-acting 3/2 electrovalve (NC); and TR - trailer reservoir
Diagram of the device for diagnosing two-line air brake systems of agricultural trailers and towed machines: APS - air preparation station; BA - brake actuator; CH – control coupling head; CR1 and CR2 - calibration reservoirs with volumes of 385± 5 cm3 and 1155 ±15 cm3, respectively (including its coupling head); CU – control unit; DT - displacement transducer (cable encoder); ERV – emergency relay valve; I/O Adapter - input-output adapter; L - line from orifice O up to and including its coupling head CH (having an inner volume of 385 ±5 cm3 under a pressure of 6.5 bar); M - manometer; O - calibrated orifice; PC – computer; PRN – printer; PRV - pressure reducing valve; PTi - ith pressure transducer; R - compressed air tank with a capacity of 30 litres; SH - supply coupling head; SOV - shut-off valve; SV1, SV2, and SV3 – 2/2 electrovalves (NC); SV4 – direct-acting 3/2 electrovalve (NC); and TR - trailer reservoir

Fig. 2.

General algorithm of a computer programme for the diagnosis of braking systems of agricultural machinery and trailers
General algorithm of a computer programme for the diagnosis of braking systems of agricultural machinery and trailers

Fig. 3.

‘Measurement’ window of the ‘Simulator’ program when checking air tank capacity (in Polish)
‘Measurement’ window of the ‘Simulator’ program when checking air tank capacity (in Polish)

Fig. 4.

Diagram and view of the dual-line trailer pneumatic system: SH - supply coupling head; CH - control coupling head; LF - line filter; ERV - emergency relay valve combined with a manual brake force regulator; TR - 20 dm3 air reservoir; BA - type 20LS brake chamber
Diagram and view of the dual-line trailer pneumatic system: SH - supply coupling head; CH - control coupling head; LF - line filter; ERV - emergency relay valve combined with a manual brake force regulator; TR - 20 dm3 air reservoir; BA - type 20LS brake chamber

Fig. 5.

The course of the pressure pt in the trailer reservoir during the tightness test of the braking system
The course of the pressure pt in the trailer reservoir during the tightness test of the braking system

Fig. 6.

The course of measured quantities during the response time test: pc - pressure of the simulator control; ps - pressure in the simulator reservoir; pt - pressure in the trailer reservoir; pa - pressure in the brake chamber; L – stroke of the actuator
The course of measured quantities during the response time test: pc - pressure of the simulator control; ps - pressure in the simulator reservoir; pt - pressure in the trailer reservoir; pa - pressure in the brake chamber; L – stroke of the actuator

Fig. 7.

The course of measured quantities during checking of the capacity of the air reservoir: pc - control pressure of the simulator; ps - pressures in the simulator reservoir; pt - pressures in the trailer reservoir; and L - stroke of the actuator
The course of measured quantities during checking of the capacity of the air reservoir: pc - control pressure of the simulator; ps - pressures in the simulator reservoir; pt - pressures in the trailer reservoir; and L - stroke of the actuator

Results of response time tr [s] of the braking system of the tested trailer

No.Bialystok University of Technology simulatorIndustrial simulator
10.2820.282
20.2810.280
30.2800.281
40.2810.280
50.2800.280
60.2790.280
70.2800.280
80.2790.280
90.2790.281
100.2820.281
110.2800.281
120.2790.280
130.2800.281
140.2800.282
150.2810.280
Mean0.2802±0.00080.2806±0.0006
Test nameNormality/p-value test results
SDAH0/0.3756H0/0.1406
DLMH0/0.5722/0.8409H0/0.0650/0.2546
DHH0/0.5855H0/0.1037
GH0/0.7342H0/0.0648
Result of the test Welch/p-valueH0/0.2278
Result of the test MWW/p-valueH0/0.2065
Response time [6]0.30.3
DOI: https://doi.org/10.2478/ama-2025-0007 | Journal eISSN: 2300-5319 | Journal ISSN: 1898-4088
Journal RSS Feed
Language: English
Page range: 54 - 60
Submitted on: Oct 10, 2023
Accepted on: Sep 10, 2024
Published on: Mar 31, 2025
Published by: Bialystok University of Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
agricultural trailer,
pneumatics,
braking system,
type-approval test,
stationary test,
simulator
Related subjects:
Engineering,
Electrical engineering,
Electronics,
Mechanical engineering,
Mechanics,
Bioengineering and biomedical engineering,
Biomechanics,
Civil engineering,
Environmental engineering

© 2025 Zbigniew Kamiński, Jarosław Czaban, published by Bialystok University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Previous articleVolume 19 (2025): Issue 1 (March 2025)Next article