摘要
超声波液相厚度测量技术已经在柴油机气缸油膜测量领域中得以验证,并得到了一定的应用.然而,当油膜厚度变化尺度较大时,常规谐振模型与弹簧模型之间存在较大的测量盲区,使超声波测量技术的应用受到较大程度的限制.基于超声波反射系数相移的油膜厚度测量方法可突破两种模型在大尺度油膜厚度测量方面的局限性,拓展超声波油膜厚度测量范围.通过开展超声波反射系数相移机理研究,首次建立油膜两侧介质声阻抗相同时的直接求解方法;搭建油膜厚度超声波反射系数相移测量系统,利用单一中心频率对10~90μm的油膜厚度展开测量,测量厚度与设置厚度具有很好的一致性,从理论和实验角度证明基于超声波反射系数相移的油膜厚度测量方法在大尺度油膜厚度测量方面的适用性.
Ultrasound has been applied to measure the lubricant film thickness between the piston assembly and cylinder wall in recent years. However, when the lubricant film thicknesses vary in a wide range, there is a blind zone between the resonant model method and spring model method, which greatly limits the application of ultrasound. In this paper,the lubricant film thickness measurement method based on the ultrasonic reflection coefficient phase shift was studied to overcome the limitation of two conventional methods. The principle of the ultrasonic reflection coefficient phase shift method was analyzed, then an accurate method to solve lubricant film thicknesses directly was proposed for the first time, with the condition that the acoustic impedance of media on both sides of the lubricant film were equal. A lubricant film thickness measurement system was used to measure the film thicknesses from 10 to 90 μm by single center frequency. The measured results were in good agreement with the set thicknesses, which demonstrated that the lubricant film thickness measurement method based on the ultrasonic reflection coefficient phase shift can measure the lubricant film thicknesses in a wide range.
作者
贺彦博
高天雯
郭奥
乔天旭
何晨晞
王国水
刘晓楠
杨晓涛
HE Yanbo;GAO Tianwen;GUO Ao;QIAO Tianxu;HE Chenxi;WANG Guoshui;LIU Xiaonan;YANG Xiaotao(College of Power and Energy Engineering,Harbin Engineering University,Heilongjiang Harbin 150001,China;College of Physics and Optoelectronic Engineering,Harbin Engineering University,Heilongjiang Harbin 150001,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2021年第1期1-8,共8页
Tribology
基金
船用低速机工程项目(MC-201501-D01-03)资助。
关键词
油膜厚度
超声波测量
反射系数相移
大尺度
直接求解
lubricant film thickness
ultrasonic measurement
reflection coefficient phase shift
wide range
direct solution
作者简介
Corresponding author:杨晓涛,E-mail:yangxiaotao1985@163.com,Tel:+86-13674675869.
