摘要
为进行柴油机在线故障诊断、结构设计和优化,试验研究了噪声产生的机理、噪声随转速和负荷的变化。在4100QBZL增压中冷柴油机上,用费托(Fischer-Tropsch,F—T)合成柴油和0群柴油进行试验,测量了柴油机燃烧产生的表面振动信号。利用A计权网络,分析测量信号,进行柴油机故障诊断。结果表明:在0.5N2kHz测试工况条件下,这两种油品的声压级均到达峰值;噪声级为86.7~99dB。得到了在一个工作循环周期中的柴油机缸盖振动加速度的变化规律。相比于0群柴油,F-T柴油燃烧柔和、放热慢、压力升高缓慢、振动和噪声较小。这可为相关的故障诊断提供依据。
The noise/variation generate-mechanism and its variation law changing with engine speed and load were investigated by tests to realize diesel-engine on-line fault-diagnosis, and design and optimize engine- structure. The experiments were conducted in a turbocharged inter-cooled diesel engine fueled on Fischer- Tropsch (F-T) diesel or 0# diesel, in which measured were the surface vibration signals of engine combustion. The signals were analyzed by an A-Weighted network for diesel engine fault diagnosis. The results show that the sound pressure reach the peak for the two fuels with the noises in 86.7--99 dB at the frequencies of 0.5--2.0 kHz. The vibration acceleration variation law is obtained in a whole working cycle of cylinder head. The diesel engine fueled on F-T diesel has softer combustion, slower heat release rate, slower pressure rise rate, and smaller vibration / noise compared with the 0# diesel.
出处
《汽车安全与节能学报》
CAS
CSCD
2014年第1期91-96,共6页
Journal of Automotive Safety and Energy
基金
山西省自然科学基金项目资助(2013011041-3)
关键词
柴油机
燃烧
费托(F—T)合成柴油
振动
噪声
在线故障诊断
diesel engines
combustion
Fischer-Tropsch (F-T) diesel
vibration
noise
on-line fault diagnosis