摘要
通过实车路试,确定了7只严重异响件(A类)和6支无异响件(N类)。由示功试验和振动噪声试验获得有、无外连接套下的加速度信号和阻尼力信号。通过对比分析可知,有外连接套下,A类减振器加速度的峰值普遍比N类大,峰值频率均在80~250 Hz频域内;无外连接套下,A类减振器的阻尼力在压缩-复原换向0.1671×T/4 s后出现明显的异常波动,其由开阀造成。A类减振器阻尼力信号在各峰值附近的RMS值、Max值和Ave值普遍比N类大。同时,异响件的开阀状态均比正常件大。
Through road test,7 dampers with serious noise problem( Class A) and 6 dampers without noise problem( class N) are determined. The damping force signal and the acceleration signal with and without external connecting sleeve are obtained by the indicator diagram test and vibration-noise test. Firstly,comparative analysis of acceleration signal and damping force signal characteristics of 15# and 47# are carried out. Then,statistical analyses of all shock absorbers are performed in time domain and frequency domain. Time domain analysis shows that the peak accelerations of class A damper were generally higher than class N damper,and the frequency range with peak acceleration is 80 ~ 250 Hz. Without external connection sleeve,the damping force abnormal fluctuations occurred when it is 0. 1671 × T / 4 s past the compression-recovery reversing point,and the valve opening is the causation.Frequency domain analysis show that the RMS value,max value and average value of damping force signal of class A damper are general greater than that of class N damper. The valve opening status of class A damper is greater than that of class N damper.
出处
《机械科学与技术》
CSCD
北大核心
2015年第3期459-463,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(11172249)资助
关键词
减振器
波动
频域
acceleration
damping
design of eyperiments
frequency bands
frequency domain analysis
hydraulic absorber
statistical methods
time domain analysis
vibrations(mechanical)
