CN203037401U - Elastohydrodynamic lubrication wire contact pressure measuring device based on photoelasticity - Google Patents
Elastohydrodynamic lubrication wire contact pressure measuring device based on photoelasticity Download PDFInfo
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- CN203037401U CN203037401U CN 201220713666 CN201220713666U CN203037401U CN 203037401 U CN203037401 U CN 203037401U CN 201220713666 CN201220713666 CN 201220713666 CN 201220713666 U CN201220713666 U CN 201220713666U CN 203037401 U CN203037401 U CN 203037401U
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Abstract
The utility model discloses an elastohydrodynamic lubrication wire contact pressure measuring device based on photoelasticity. The measuring device comprises a collimation light source, a polarizer, a friction contact area, an analyzer, a stereoscopic microscope and an image recording device in turn along an optical path. According to the utility model, a transparent photoelastic material is used to manufacture a friction specimen forming elastohydrodynamic lubrication; a polarized light is used to irradiate the friction area; the microscope is used to magnify and observe the contact area towards the light source behind the analyzer plate; photoelastic fringes appear in a friction pair of the contact area irradiated by the polarized light; after calculation and calibration, the level of the pressure of an oil film of the contact area can be displayed and measured in real time; the pressure resolution depends on the magnifying ability of the used microscope and the resolution of a camera; and the measuring device can measure the pressure distribution of the elastohydrodynamic wire contact area with high resolution in real time.
Description
Technical field
The utility model relates to elastohydrodynamic lubrication contact region oil film pressure field of measuring technique, is specifically related to based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism.
Background technology
Elastohydrodynamic lubrication appears at during gear Contact Pair, rolling bearing and cam pair etc. contact usually.In this type of contact, the relative motion on two surfaces of phase mutual friction is brought lubricant into contact region, owing to be point or line contact, and the rigidity on two surfaces is all higher, and the real contact area of contact region is less usually, so contact stress is bigger.The accurate measurement of oil film pressure is the underlying issue of elastohydrodynamic lubrication and friction field between friction pair inside, elastohydrodynamic lubrication line contact region and friction pair.
The accurate measurement of oil film pressure has great significance to research oil film carrying principle between the elastohydrodynamic lubrication friction pair.Internal stress state under the surface of friction pair has directly determined duty and the life-span of parts, and the feature of elastohydrodynamic lubrication pressure oil film is that contact region internal pressure distribution gradient is very big, the elastohydrodynamic lubrication film thickness is that micro-nano rank, contact region representative width are 300
, so the measurement of bullet stream oil film pressure is difficulty maximum in the elastohydrodynamic lubrication experiment.
The foundation of elastohydrodynamic lubrication theoretical analysis and mathematical model has reached fairly perfect level, and the oil film pressure of bullet stream contact region also can be found the solution by numerical method.The measuring method of elastohydrodynamic lubrication contact region oil film pressure mainly contains film micropressure sensor, Raman microscope and supercritical ultrasonics technology, membrane process, oil film thickness anti-inference method etc., all there is certain limitation in these methods: film micropressure sensor method is owing to the reason of manufacture craft, the size of sensor can't be done smallerly all the time, therefore spatial resolution is limited, another shortcoming of microsensor is because the temperature and pressure sensor interacts in addition, and the marked ratio of this mode is difficulty; The Raman microscope method will be obtained the influence that the scattering spectrum of measurement point is stressed by the mode of scanning, thereby calculate the variation of pressure, so the tonogram that the Raman microscope method obtains between whole measurement zone needs for a long time, and can't obtain instantaneous pressure curve; The resolution that the supercritical ultrasonics technology gaging pressure distributes is limited by the size of sonac and the frequency of used sound wave, very is not fit to the pressure survey of bullet stream contact region; Membrane process still is in the measuring phases of static contact at present; Oil film thickness anti-inference method is actual to be a kind of indirect pressure measurement method rather than direct tonometry.Comprehensive, still there is not good measurement means at present.
The utility model content
It is a great problem that secondary pressure survey is joined in elastohydrodynamic lubrication film pressure and friction, and present bullet stream contact region oil film pressure measuring method all exists certain limitation, the requirement of can't satisfy high resolving power, measuring, can measure micro-nano interval pressure in real time.The utility model proposes high resolving power, can measure in real time that bullet stream contact region oil film transient pressure distributes and friction joins that secondary internal pressure distributes based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, concrete technical scheme is as follows.
Based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, comprise collimated light source successively along optical path direction, polarizer, the rubbing contact zone, analyzer, stereomicroscope and record by imaging device, the record by imaging device also is connected with the computing machine that is used for according to photoelasticity fringe calculating rubbing contact district pressure, described rubbing contact zone comprises sample and following sample, last sample is for to be made by the transparent optical resilient material, following sample is that elastooptic mateiral or metal material are made, the rotation of last sample is by first motor-driven, the rotation of following sample is by second motor-driven, last sample 1 and first motor are installed on vertical slide unit by support, and slide unit is installed on the frame and can finely tunes movement up and down along frame; The lower part of following sample is arranged in the roller box that lubricating oil or railway grease are housed, and brings described lubricating oil or railway grease into the rubbing contact district when following sample rotates, and therefore forms various elastohydrodynamic lubrication line contact conditions by controlling the rotating speed of going up sample and following sample respectively.
Further optimize, also be provided with quarter wave plate between described polarizer and the rubbing contact zone, also be provided with another quarter wave plate between rubbing contact zone and the analyzer 4, the monochromatic light that collimated light source produces passes polarizer, quarter wave plate, last sample 1, described another quarter wave plate, analyzer, stereomicroscope arrives the record by imaging device, the rubbing contact zone is in the middle of the visual field of stereomicroscope, make imaging clear by the eyepiece of control agent stereomicroscope and the distance in rubbing contact zone, the record by imaging device photograph after the amplification bullet stream contact region and on the photoelastic pattern picture, the fringe order of photoelastic pattern picture has reflected the variation of internal stress under contact region oil film pressure and the friction surface, carries out calculation of pressure and the demonstration of bullet stream contact region by computing machine.
Further optimize, describedly also comprise load maintainer based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, load maintainer comprises the loading lever, the roller box is installed in loading lever one end and rotates up and down with loading lever, and the loading lever other end is provided with for regulating and goes up sample contacts pressure with following sample load.
Further optimize, described collimated light source, polarizer, quarter wave plate, photoelastic material disk, another quarter wave plate, analyzer, stereomicroscope and record by imaging device are installed on the X-Y platform by support, and X-Y platform can carry out the adjusting of position along rectangular axes X-Y direction.
Further optimize, the described thin disk of sample for being made by the transparent optical resilient material of going up, the ladder rotating shaft of following sample for being made by elastooptic mateiral or metal material, following sample is bearing in the roller box by rolling bearing, and the maximum gauge raised profile on the following sample is immersed in described lubricating oil or the railway grease.
Further optimize, described upward sample 1 drives rotation by first motor by synchronous band, and following sample is driven by synchronous band by second motor.
Further optimize, last sample and following sample do that two parallel cylinders of similar axis contact mutually to rolling.
The utility model adopts transparent elastooptic mateiral to make the friction sample that forms elastohydrodynamic lubrication, use polarizing light irradiation rubbing contact zone in a side of friction sample, behind the opposite side analyzer of friction sample, amplify observation rubbing contact zone towards light source with microscope, the characteristic of elastooptic mateiral makes in friction pair inside, the contact region of polarizing light irradiation and photoelasticity fringe occurs, through striped is calculated and demarcates, measure the size of contact region oil film pressure.The size variation that shows rubbing contact district oil film pressure by photoelastic striped in real time.
Compared with prior art, the utlity model has following advantage and technique effect: elastohydrodynamic lubrication appears at during gear Contact Pair, rolling bearing and cam pair etc. contact usually, feature is that contact region internal pressure distribution gradient is very big, film thickness is that micro-nano rank, contact region representative width are hundreds of microns, and elastohydrodynamic lubrication pressure does not still have desirable measurement means at present.The utility model is based on the photoelasticity principle, adopt the transparent optical resilient material to make the friction sample that forms elastohydrodynamic lubrication, and use the polarizing light irradiation friction area, behind analyser plate, amplify the observation contact region towards light source with microscope, photoelasticity fringe appears in friction pair inside, the contact region of polarizing light irradiation, through calculating and demarcating, can show in real time, measure contact region oil film pressure size, pressure resolution depends on the resolution of used microscopical amplifying power and video camera, so the utility model can high resolving power, measure the pressure distribution that plays the streamline contact region in real time.
Description of drawings
Fig. 1 is based on the structural representation of stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism in the embodiment.
Embodiment
Be described further below in conjunction with the enforcement to this law of accompanying drawing and example, but concrete enforcement of the present utility model and protection domain are not limited thereto.
As Fig. 1, photoelasticity elastohydrodynamic lubrication line contact pressure measurement mechanism is by stereomicroscope 5, record by imaging device 6(such as video camera), polarizer 19, analyzer 4, quarter wave plate 3, collimated light source 18, go up sample 1, down sample 2, load maintainer 17, vertically slide unit 10, X-Y direction slide unit 8, stand 9 etc. are formed.The thin disk of last sample 1 for being made by the transparent optical resilient material, the ladder rotating shaft of following sample 2 for being made by elastooptic mateiral or metal material.Last sample 1 can be driven by band synchronously by first motor 11 and rotate, and last sample 1 and motor 11 are installed on vertical slide unit 10 by support, and last sample 1 and first motor 11 can be along frame trim locations about in the of 9.Following sample 2 is driven by being with synchronously by second motor 15.Following sample 2 is bearing in the roller box 16 by 2 rolling bearings, be contained with lubricating oil or railway grease in the roller box 16, the maximum gauge raised profile of following sample 2 is immersed in lubricating oil or the railway grease, following sample 2 rotates brings lubricating oil or railway grease into contact region, since two samples be the parallel contact of similar two cylinder axis mutually to rolling, therefore can form various elastohydrodynamic lubrication line contact conditions by the rotating speed of controlling sample 1 and 2 respectively.Roller box 16 is installed in loading lever one end of load maintainer, can rotate up and down with loading lever, and the load 13 that loads the lever other end makes down sample 2 upwards contact and provide different contact pressure with sample 1.The monochromatic light that is produced by collimated light source 18 passes polarizer 19, quarter wave plate 3(can omit), photoelastic material disk (sample 1), quarter wave plate 3(can omit), analyzer 4, stereomicroscope 5 arrive record by imaging devices 6.Collimated light source 18, polarizer 19, quarter wave plate 3(can omit), photoelastic material disk, quarter wave plate 3(can omit), analyzer 4, stereomicroscope 5 and record by imaging device 6 be installed on the X-Y platform 8 by support, can carry out the adjusting of position along the X-Y direction, the contact region is in the middle of the visual field of stereomicroscope, and accurately the eyepiece of control agent stereomicroscope and the distance of contact region make imaging clear.
This method adopts transparent elastooptic mateiral to make the friction sample that forms elastohydrodynamic lubrication, and use the polarizing light irradiation friction area, behind analyser plate, amplify the observation contact region towards light source with microscope, the characteristic of elastooptic mateiral makes in friction pair inside, the contact region of polarizing light irradiation and photoelasticity fringe occurs, through striped is calculated and demarcates, can measure the size of contact region oil film pressure, elastooptic mateiral can show the size variation of pressure in real time by photoelastic striped, the pressure resolution of bullet stream contact region depends on the resolution of used microscopical amplifying power and video camera, therefore can high resolving power, measure the pressure distribution of bullet stream contact region in real time.
Be installed in record by imaging device 6 on the stereomicroscope 5 can photograph after the amplification bullet stream contact region and on the photoelastic pattern picture, the fringe order of photoelastic image has reflected the variation of internal stress under contact region oil film pressure and the friction surface, can carry out calculation of pressure and the diagram of bullet stream contact region by computing machine 7.Computing method can adopt phase-shift method of the prior art, color domain phase-shift method and load method etc. progressively.In detail also can list of references: [1] Lei Zhenkun, high billows, cloud Dazhen. determine the integration phase-shift method [J] of photoelasticity parameter in real time. optical technology, 2004,30 (2): 280-284; [2] Han Yongsheng, Zhang Dongsheng, Cui Yang, Liang Qiusheng. photoelastic stress is analyzed [J] automatically. Shanghai University's journal (natural science edition), 2009,15(2): 147-152.
Operational instances: at first with sample under sample and the optical axis type on the photoelastic material making dish-type, and install down sample.Following sample is with the rolling bearing supporting and be immersed in lubricating oil or the railway grease following sample motor-driven.Adjust that center of lens points such as stereomicroscope 5, record by imaging device 6, polarizer 19, analyzer 4, quarter wave plate 3, collimated light source 18 overlap and minute surface is parallel, unlatching collimated light source power supply.The load 13 of adjusting load maintainer 17 makes sample contact up and down.Adjustment X-Y platform 8, vertical slide unit 10 are positioned in the middle of the light path sample contact region, and adjust microscopical focal length, and the clear picture of contact region is shown.Utilize computer acquisition and separate photoelastic figure line, calculate bullet stream contact region pressure.
Claims (6)
1. based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, it is characterized in that comprising collimated light source successively along optical path direction, polarizer, the rubbing contact zone, analyzer, stereomicroscope and record by imaging device, the record by imaging device also is connected with the computing machine that is used for according to photoelasticity fringe calculating rubbing contact district pressure, described rubbing contact zone comprises sample and following sample, last sample is for to be made by the transparent optical resilient material, following sample is that elastooptic mateiral or metal material are made, the rotation of last sample is by first motor-driven, the rotation of following sample is by second motor-driven, last sample (1) and first motor are installed on vertical slide unit by support, and slide unit is installed on the frame and can finely tunes movement up and down along frame; The lower part of following sample is arranged in the roller box that lubricating oil or railway grease are housed, and brings described lubricating oil or railway grease into the rubbing contact district when following sample rotates, and forms various elastohydrodynamic lubrication line contact conditions by controlling the rotating speed of going up sample and following sample respectively.
2. according to claim 1 based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, it is characterized in that also being provided with quarter wave plate between polarizer and the rubbing contact zone, also be provided with another quarter wave plate between rubbing contact zone and the analyzer 4, the monochromatic light that collimated light source produces passes polarizer, quarter wave plate, last sample (1), described another quarter wave plate, analyzer, stereomicroscope arrives the record by imaging device, the rubbing contact zone is in the middle of the visual field of stereomicroscope, make imaging clear by the eyepiece of control agent stereomicroscope and the distance in rubbing contact zone, the record by imaging device photograph after the amplification bullet stream contact region and on the photoelastic pattern picture, the fringe order of photoelastic pattern picture has reflected the variation of internal stress under contact region oil film pressure and the friction surface, carries out calculation of pressure and the demonstration of bullet stream contact region by computing machine.
3. according to claim 1 based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, it is characterized in that also comprising load maintainer, load maintainer comprises the loading lever, the roller box is installed in loading lever one end and rotates up and down with loading lever, and the loading lever other end is provided with for regulating and goes up sample contacts pressure with following sample load.
4. according to claim 1 based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, it is characterized in that described collimated light source, polarizer, quarter wave plate, photoelastic material disk, another quarter wave plate, analyzer, stereomicroscope and record by imaging device are installed on the X-Y platform by support, X-Y platform can carry out the adjusting of position along rectangular axes X-Y direction.
5. each is described based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism according to claim 1～4, it is characterized in that the described thin disk of sample for being made by the transparent optical resilient material of going up, the ladder rotating shaft of following sample for being made by elastooptic mateiral or metal material, following sample is bearing in the roller box by rolling bearing, and the maximum gauge raised profile on the following sample is immersed in described lubricating oil or the railway grease.
6. according to claim 5 based on stress optic elastohydrodynamic lubrication line contact pressure measurement mechanism, it is characterized in that sample (1) is rotated by being with synchronously to drive by first motor, following sample is driven by being with synchronously by second motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220713666 CN203037401U (en) | 2012-12-21 | 2012-12-21 | Elastohydrodynamic lubrication wire contact pressure measuring device based on photoelasticity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220713666 CN203037401U (en) | 2012-12-21 | 2012-12-21 | Elastohydrodynamic lubrication wire contact pressure measuring device based on photoelasticity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063355A (en) * | 2012-12-21 | 2013-04-24 | 华南理工大学 | Measuring method and measuring device of elastohydrodynamic lubrication line contact pressure based on photoelasticity |
| CN105181459A (en) * | 2015-09-22 | 2015-12-23 | 天津城建大学 | Pressure measurement system with photo-elasticity pressure sensor |
| CN105606294A (en) * | 2015-12-17 | 2016-05-25 | 华中科技大学 | Gas pressure intensity distribution measuring device and method of gas film surface of static pressure gas thrust bearing |
| CN114295541A (en) * | 2021-12-20 | 2022-04-08 | 北京魏桥国科新能源技术研究院有限公司 | Hot extrusion lubrication effect detection device and method |
-
2012
- 2012-12-21 CN CN 201220713666 patent/CN203037401U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063355A (en) * | 2012-12-21 | 2013-04-24 | 华南理工大学 | Measuring method and measuring device of elastohydrodynamic lubrication line contact pressure based on photoelasticity |
| CN105181459A (en) * | 2015-09-22 | 2015-12-23 | 天津城建大学 | Pressure measurement system with photo-elasticity pressure sensor |
| CN105181459B (en) * | 2015-09-22 | 2018-06-12 | 天津城建大学 | A kind of pressure-measuring system using photoelastic pressure sensor |
| CN105606294A (en) * | 2015-12-17 | 2016-05-25 | 华中科技大学 | Gas pressure intensity distribution measuring device and method of gas film surface of static pressure gas thrust bearing |
| CN105606294B (en) * | 2015-12-17 | 2018-04-24 | 华中科技大学 | The gas pressure intensity apparatus for measuring distribution and method in pressurized air thrust bearing air film face |
| CN114295541A (en) * | 2021-12-20 | 2022-04-08 | 北京魏桥国科新能源技术研究院有限公司 | Hot extrusion lubrication effect detection device and method |
| CN114295541B (en) * | 2021-12-20 | 2023-11-17 | 北京魏桥国科新能源技术研究院有限公司 | Hot extrusion lubrication effect detection device and method |
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Granted publication date: 20130703 Effective date of abandoning: 20141203 |
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