Numerical Analysis of Oscillation of Servo-Hydraulic Systems for High Strain Rate Steel Test
Oscillation is common in high speed steel test.In such tests,the signal of experimental force is greatly perturbed by multiple passages of stress waves reflected within the testing system.This paper presents the efforts of tests and simulation in order to get deep insight into the principles of the force signal oscillation in high strain rate test.The mechanical components along the loading path of the hydraulic-servo high speed test machine are simulated using finite element method.Numerical study of the sensitivity of the geometrical parameters,stiffness and mass of different parts of the loading system on the ringing effect is addressed.The result of the simulation indicates that,using steel grip in replace of the original Titanium alloys grip on the loading part of the test machine is almost no influence on the natural frequency and oscillation amplitude at cross section,but maintain acceptable strain rate levels.Another approach is to shorten the force measurement device by using the material with higher specific stiffness,so as to reduce the period needed to reach dynamic equilibrium within the force measurement device and realizing its higher natural frequency.
high strain rate test oscillation servo-hydraulic system
YIN Bin LAI Xinghua XIA Yong
Suzhou Automobile Research Institute(Xiangcheng), Tsinghua University, Suzhou 215000, Jiangsu, China China State Key Lab of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
国际会议
成都
英文
647-651
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）