Measuring method and measuring device of elastohydrodynamic lubrication line contact pressure based on photoelasticity

Abstract

The utility model discloses a measuring method and a measuring device of elastohydrodynamic lubrication line contact pressure based on photoelasticity. According to the measuring method of the elastohydrodynamic lubrication line contact pressure based on the photoelasticity, a friction test sample of elastohydrodynamic lubrication is made of transparent photoelasticity materials, a friction area is irradiated by polarized light, the friction area is observed in an amplified mode through a microscope in the direction of a light source after a polarizing film is detected, photoelasticity strips appear in a friction pair in the contact area irradiated by the polarized light, oil film pressure in the contact area can be displayed and measured in real time after calculating and marking, and resolution ratio of the pressure is determined by the amplification ability of the microscope which is used and the resolution ratio of a camera. The measuring device of the elastohydrodynamic lubrication line contact pressure based on the photoelasticity comprises a collimation light source, a polarizer, the friction contact area, an analyzer, a stereoscopic microscope and an imaging recording device in sequence in the light path direction. According to the measuring method and the measuring device of the elastohydrodynamic lubrication line contact pressure based on the photoelasticity, distribution of pressure in the elastohydrodynamic lubrication line contact area can be measured with high resolution ratio and in real time.

Description

technical field [0001] The invention relates to the technical field of oil film pressure measurement in an elastohydrodynamic lubrication contact area, in particular to a photoelastic-based elastohydrodynamic lubrication line contact pressure measurement method and device. Background technique [0002] Elastohydrodynamic lubrication usually occurs in contacts such as gear contact pairs, rolling bearings and cam pairs. In this type of contact, the relative motion of the two surfaces rubbing against each other brings the lubricant into the contact area. Since it is a point or line contact, and the stiffness of the two surfaces is high, the actual contact area of ​​the contact area is usually small, so the contact Stress is greater. Accurate measurement of oil film pressure inside and between friction pairs in the contact area of ​​elastohydrodynamic lubrication line is a basic problem in the field of elastohydrodynamic lubrication and friction. [0003] Accurate measuremen...

AI Technical Summary

Problems solved by technology

The measurement methods of oil film pressure in the contact area of ​​elastohydrodynamic lubrication mainly include thin film micro pressure sensor, Raman microscope and ultrasonic method, thin film method, oil film thickness inverse method, etc. These methods all have certain limitations: the thin film micro pressure sensor method is due to the Due to the process, the size of the sensor cannot be made smaller, so the spatial resolution is limited. In addition, another disadvantage of the microsensor is that due to the mutual influence of the temperature and pressure sensors, it is difficult to calibrate in this way; Raman microscopy requires scanning The way to obtain the scattering spectrum of the measurement point is affected by the pressure, so as to calculate the pressure change, so the Raman microscope method takes a long time to obtain the pressure map of the entire measurement interval, and cannot obtain the instantaneous pressure curve; the ultrasonic method measures the pressure The resolution of the distribution is limited by the size of the ultrasonic sensor and the frequency of the sound waves used, and is not suitable for pressure measurement in the elastohydrodynamic contact area; the thin film method is still in the measurement stage of static contact; the oil film thickness inverse method is actually an indirect method. pressure measurement method instead of direct pressure measurement method

In general, there is currently no good measure

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