|Table of Contents|

Effect of subsystem parameters on vibration isolation characteristics of two-stage vibration isolation system(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2018年03期
Page:
114-128
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Effect of subsystem parameters on vibration isolation characteristics of two-stage vibration isolation system
Author(s):
CHEN Jun1 DING Jie1 YAN Bing2 WANG Yong-sheng1 DONG Da-wei23 HUA Chun-rong2

1. Zhuzhou CRRC Times Electric Co., Ltd., Zhuzhou 412000, Hunan, China; 2. School of Mechanical Engineering,
Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 3. Statek-Key Laboratory of
Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
Keywords:
vehicle engineering subsystem two-stage vibration isolation system vibration isolation characteristic power pack vibration absorber
PACS:
U270.11
DOI:
-
Abstract:
To determine the effect of subsystem parameters on the vibration isolation characteristics of a two-stage vibration isolation system(TSVIS), a three degrees-of-freedom(3-DOF)dynamics model of TSVIS with a subsystem was established. The analytical expressions for the amplitude ratio of the first-and second-stage main system and the subsystem were derived. The variation rules of these three amplitude ratios with the mass, natural frequency, and damping ratio of the subsystem were analyzed. The exact analytical and numerical solutions of the optimum parameters for the subsystem as an absorber on TSVIS were presented. The first batch of diesel railcar power packs in China were selected as the research objects, and the influences of stiffness, damping, and mass of the radiator on the vibration isolation performance of the power pack TSVIS and the vibration intensities of the diesel generator set and radiator were investigated. The prototype of the power pack TSVIS with the optimum stiffness of the radiator isolator was obtained. A vibration test was carried out. Test result shows that a radiator vibration isolator stiffness greater than 1.5 times the turning point stiffness can seriously deteriorate the radiator’s vibrations. A damping loss factor of approximately 0.24 can effectively restrain the vibration intensity and force transmission ratio peak of the TSVIS. A larger mass of the radiator can effectively improve the vibration isolation performance of the TSVIS and reduce the vibration intensities of both the diesel unit and the radiator. The maximum dynamic reaction force, under the stalling condition of the second-stage vibration isolator, reduces by 50%. The maximum measured dynamic reaction force of the second-stage vibration isolator under normal condition is 296 N, which is better than the current value. The maximum measured vibration intensities of the diesel unit and radiator under normal condition are 15.45 and 4.97 mm·s-1, respectively, which represents an exceptionally satisfactory level. Therefore, by employing a larger mass and damping of the subsystem, and optimizing the TSVIS by regarding it as a vibration absorber, can improve the dynamic performances of the TSVIS under diesel engine starting, stalling and normal conditions. 43 figs, 25 refs.

References:


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Last Update: 2018-07-14