Assessing the reliability of testing methods used for fluid telescopic shock absorbers in cars

• Autorzy: Gardulski J.
• Języki publikacji: EN

Abstrakty

EN

Shock absorbers in modern cars have asymmetric damping characteristics corrected by overflow valves. Their indicator diagrams are far from being elliptical. Defective shock absorbers may lead to excessive amplitudes in vibration accelerations, excessive car body rolls, both lateral and longitudinal, excessive braking distance and destruction of the car components or road surface. The paper discusses methods of testing shock absorbers mounted or removed from the car. Advantages and disadvantages of the methods are used as bas is for the assessment. It is pointed out that the methods should not assume linear characteristics of springs and damping elements. Testing methods can be divided as follows: - those referring to shock absorbers removed from the car, - those referring to shock absorbers mounted in the car. Methods used for testing shock absorbers removed from the car are those performed on indicator test rigs provided with mechanical-electric or electrohydraulic extortion system. Such test rigs have measuring devices to enable recording of indicator diagrams relative to the absorber damping force in function of piston stroke with deflection and reflection. Among a variety of testing methods, those requiring no removal are by far preferred by Vehicle Control Stations or diagnostic lines. The methods can be divided asfollows: -free vibration type, -forced vibration type.

Słowa kluczowe

EN

transport; road transport; safety of transport; testing methods; shock absorbers

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2008
• Tom: Vol. 15, No. 1
• Strony: 79--85
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Gardulski J.

• Silesian University of Technology, Faculty of Transport Department of Automotive Vehicle Construction Krasińskiego St. 8, 40-019 Katowice, Poland

Bibliografia

• [1] Bocheński, C., Lozia, Z., Mikołajczuk, J., An attempt to objectively assess the testing methods for shock absorbers mounted in vehicles as recommended by EUSAMA association, Tenth Conference on Diagnostics for Work Machines and Vehicles, Bydgoszcz-Borówno 1999.
• [2] Gardulski, J., A method for assessing technical state of car suspensions using no test rigs, Published by Institute of Service Technology, Radom 2003.
• [3] Gardulski, J., Warczek, J., Diagnostics for shock absorber analysis of nonlinear effects, Silesian University of Technology Scientific Journals, no.48, ser.transport, Gliwice 2003.
• [4] Gardulski, J., Warczek, J., Technical state of a fluid telescopic shock absorber as identified on the basis of its characteristics analysis, 30-th Jubilee Polish Symposium on Diagnostics for Machines, Węgierska Górka, 2003.
• [5] Gardulski, J., Warczek, J., Damping power as a diagnostic factor for shock absorbers in cars, DIAGNOSTYKA, vol.29, Warsaw 2003.
• [6] Lozia, Z., Mikołajczuk, J., Assessment of usefulness of the diagnostic test on vehicle-mounted shock absorber condition using kinematic extortion for wheel-ground contact, Automotive Archives 2, 1997.
• [7] Ringus, G., A neural network based diagnostic test system for armored vehicle shock absorbers. Expert Systems with Applications, vol. 11. No. 2, pp. 237-244, 1996.