Evaluation of dampers using a resonance adhesion tester

Abstract

KOLÁČEK STANISLAV, DOSTÁL PETR: Evaluation of dampers using a resonance adhesion tester. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 6, pp. 1749-1753 This paper describes the diagnostics of dampers using resonant adhesion tester. This kind of test is non-invasive and evaluation is based on the EUSAMA methodology. The main goals of this method were to practically measure and evaluate technical condition of the shock absorbers. However, this method does not measure only damper properties, but the whole axle, too. During measurements, one must take into account the fact that the results can be easily infl uenced by external factors. These include e.g. wrong tire pressure, diff erent kind of shock absorbers, and tires. The actual testing revealed that the measurement results are also infl uenced by bad condition of the vehicle axles. If we eliminate all these draw-backs, dampers testing can be very accurate.

Analysis of Driving Safety Criteria Based on National Regulations for the Suspension Systems of NGVs

“…The proposed procedure to evaluate the suspension performance of NGVs considers two measurement criteria: i) A min , and ii)  min which can be recorded by a standard commercial suspension tester machine. The tester machine consists of hardware (sensors + transducers) with processing so ware, and a mobile oscillating platform in a metal frame on which are mounted casters and handle; the platform is on one side connected to electric motor with an eccentric sha and the opposite side is stored in the pivot, an oscillating circular cam li s the platform with an wheel up to a frequency of 25 Hz, under the platform, there is installed a load cell, which is sensing the wheel load on the platform (Buczaj et al, 2007;Koláček and Dostál, 2013).…”

“…The state regulations of the European Union country members, United States, Japan, Colombia, among others; establish that there must be a periodic technical review for the diff erent systems that vehicles possess (see Tab. This regulation establishes two types of periodic reviews for the suspension system: i) visual inspection, examines the state of: fi xations and suspension components, presence of fi ssures, corrosion symptoms, existence of welded repairs, and presence of damages, deformations, and oil leakage (MITC, 2006); and ii) mechanical review, identifi es the suspension condition according to the method denominated EuSAMA (EuSAMA, 1976), which has been a fundamental document about studies about the equipment for the evaluation of vehicles suspension system conditions (SAE, 1996;SAE, 2000); and national standards. The current evaluation of NGVs suspension system is done following the guidelines of the original method established by EuSAMA regulation (EuSAMA, 1976;Koláček and Dostál, 2013). While there has been a signifi cant increase in the amount of consumers' interest in the driving safety/comfort issues of privately owned vehicles.…”

Suspension Fault Diagnostics Using Vehicle Pitch and Roll Models

“…The experiment results show a high accuracy for damper fault detection. Another solution proposed in (Koláček & Dostál, 2013) employs the tire force information for damper diagnostics. The test vehicle is placed on the vibration platform with the known vibration frequency.…”