1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards DAMPING FORCE CHARACTERISTICS TEST OF HYDRAULIC SHOCK ABSORBER AT HIGH TEMPERATURE Do Not Use on New Programs. Being Replaced by GMW14540 EDS-T-2506 ISSUED DATE: 1988. 01. 29 REVISED DATE: 2008. 10. 23 VERSION: 4 (Sup
2、erceded) EDS-T-2506DAMPING FORCE CHARACTERISTICS TEST OF HYDRAULIC SHOCK ABSORBER AT HIGH TEMPERATURE PAGE: 1/2 ISSUED DATE: 1988. 01. 29 REVISED DATE: 2008. 10. 23 VERSION: 4 GM DAEWOO Auto & Technology Note: This standard may be applied only for current project (incl. T255 Program). It is Superced
3、ed for all future projects and replaced by GMW14540. 1. PURPOSE The purpose of this standard is to examine the damping force characteristics of hydraulic shock absorber at high temperature. 2. EQUIPMENT 2.1. Vibrator: The device which vibrates, fixing the upper end part of shock absorber and varying
4、 the speed of the lower end part according to testing conditions. 2.2. Force measuring device: The device outfitted with the meters for stroke and speed (pistion speed) and capable of measuring and recording the damping force at the stroke and the speed. 2.3. Temperature measuring device 2.4. X-Y re
5、corder 3. TEST CONDITIONS 3.1. Test according to EDS-T-2502. Test speeds shall be 50, 100, 200 rpm. 3.2. Test temperature t1 = 222K t2 = see chart 5 3.3. Heat the test sample from t1 to t2 by vibrating it at a test stroke of 100mm and a test speed of 200 rpm. 3.4. temperature measuring points shall
6、be the bottom of shock absorber in case of twin tube type and the center of outer tube in case of single tube type. 3.5. Prepare at least four test samples. 4. TEST PERFORMANCE 4.1. Test the test sample according to 3.1 at t = t1. 4.2. Heat the test sample according to 3.3. EDS-T-2506DAMPING FORCE C
7、HARACTERISTICS TEST OF HYDRAULIC SHOCK ABSORBER AT HIGH TEMPERATURE PAGE: 2/2 ISSUED DATE: 1988. 01. 29 REVISED DATE: 2008. 10. 23 VERSION: 4 GM DAEWOO Auto & Technology 4.3. Test the test sample according to 3.1 at t = t2. 4.4. Compare the measured damping forces. 4.5. Determine the lag of damping
8、forces. 4.6. Draw damping force-displacement curve and determine the damping efficiency loss by comparing the areas of diagram. 5. LIMITING VALUES AND CALCULATION 5.1. Limiting value Temperature t22K Damping force decrease % max. Damping force lag % max. Damping force loss % max. 80 25 25 25 5.2. Li
9、miting value calculation Damping force decrease(%) = U UU9Damping force efficiency loss(%) = “U “U“U9Where, F means damping force and A means the area within damping force-displacement curve. 5.3. The others, see the DWG. 6. RELATED STANDARDS KS R 4019 Telescopic Shock Absorbers GME L-0-16 High Temperature Test
