CN108827870A - A kind of friction test device and friction parameter test method of achievable vacuum microgravity environment simulation - Google Patents

A kind of friction test device and friction parameter test method of achievable vacuum microgravity environment simulation Download PDF

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Publication number
CN108827870A
CN108827870A CN201810270396.XA CN201810270396A CN108827870A CN 108827870 A CN108827870 A CN 108827870A CN 201810270396 A CN201810270396 A CN 201810270396A CN 108827870 A CN108827870 A CN 108827870A
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CN
China
Prior art keywords
friction
test specimen
friction test
stop sleeve
vacuum
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CN201810270396.XA
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Chinese (zh)
Inventor
佟瑞庭
权泽芬
刘更
万琦
韩冰
杨小辉
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西北工业大学
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Application filed by 西北工业大学 filed Critical 西北工业大学
Priority to CN201810270396.XA priority Critical patent/CN108827870A/en
Publication of CN108827870A publication Critical patent/CN108827870A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00Investigating materials by mechanical methods
    • G01N19/02Measuring coefficient of friction between materials

Abstract

The present invention relates to a kind of friction test device of achievable vacuum microgravity environment simulation, which can simulate vacuum and microgravity environment simultaneously, carry out friction test in the present context.Whole device is placed in vacuum tank 10, the gravity of friction test specimen 8 is offset by suspension method, electromechanical actuator 1 drives stop sleeve 5 to make uniform motion, so that relative motion occurs for friction test specimen 8 and friction surface 6, before measurement frictional force, first friction test specimen 8 is replaced to measure the resistance resultant force that other component generates in motion process with the box nut of equal quality, resistance resultant force is subtracted with total frictional force again and is averaged the frictional force as the pair that rubs, and the ratio of frictional force and normal load is coefficient of friction under this condition.The device can carry out the friction test under vacuum microgravity environment under differentiated friction pair, different texture surface, different speed of related movement and different loads.The present invention have the characteristics that structure it is simple, not by time restriction, alterability is strong, high reliablity and at low cost.

Description

A kind of friction test device and friction parameter of achievable vacuum microgravity environment simulation Test method

Technical field

The invention belongs to mechanical engineering technical fields, and in particular to a kind of friction of achievable vacuum microgravity environment simulation Experimental rig and friction parameter test method based on this device, the detection applied to different surfaces coefficient of friction.

Background technique

NASA's studies have shown that the failure of the space mechanism component of significant proportion is related with space friction, reduces space machine The frictional force of structure relative motion surface is of great significance to the normal operation for ensuring spacecraft and lengthening the life.Spacecraft is in space In vacuum microgravity environment, there are biggish differences for andfrictional conditions and ground environment, thus need in ground simulation vacuum Microgravity environment carries out the friction under differentiated friction pair, different surfaces situation, different speed of related movement and different loads Test, certain theoretical foundation is provided for space friction problem, to reduce due to Spacecraft malfunction caused by the friction of space.

Consulting literatures find that common space microgravity environment ground simulation method has:Fall tower method, parabolic flight method, suspention Method, water float glass process and gas floatation process, due to fall Ta Fa and parabolic flight method involve great expense and system complex, resistance of the water float glass process vulnerable to water The influence of power and turbulent flow and test specimen need to do special water-proofing treatment and the deficiencies of gas floatation process are affected to andfrictional conditions, The present invention, come stimulated microgravity, mainly balances the weight of friction test specimen using suspension method by the vertical tension of elastic lifting rope Power, this method have the advantages that structure is simple and convenient to operate and at low cost.

It finds by literature search, a kind of patent of Patent No. 201310415789.2 " space microgravity environment ground face mould Quasi- experimental rig " adjusts the tension of lifting rope in real time using motor to carry out gravity compensation, to realize that microgravity is simulated, still The device not can be carried out the friction test under the environment.In addition, there is now the simulation that many systems carry out microgravity environment, and mesh Before there is no friction test device under the environment.

Summary of the invention

It is an object of that present invention to provide a kind of friction test device of achievable vacuum microgravity environment simulation, the device energy Enough while vacuum and microgravity environment are simulated, and friction test can be carried out in the present context, is able to carry out different loads, different phases To the friction test of movement velocity, differentiated friction auxiliary material and different texture surface.

The technical scheme is that:A kind of friction test device of achievable vacuum microgravity environment simulation, including one A friction test platform being placed in vacuum tank, which offsets friction test specimen gravity by suspension method, specifically, described rub Experimental provision is wiped mainly by electromechanical actuator 1, high-precision pull pressure sensor 2, line slide rail 3, guide rail slide block 4, stop sleeve 5, friction surface 6, elastic lifting rope 7, friction test specimen 8, rack 9, vacuum tank 10, gasket 11, loading spring 12 and pressure sensor 13;Package unit is placed in vacuum tank 10, and the rotary motion of motor is converted into linear motion output by electromechanical actuator 1, Output end connects high-precision tension-compression sensor 2, and high-precision tension-compression sensor 2 is connect with the pedestal of stop sleeve 5, stop sleeve 5 It is fixed on the guide rail slide block 4 of line slide rail 3, line slide rail 3 is installed in rack 9;Rack 9 is fixed in elastic 7 upper end of lifting rope, Lower end is connected with stop sleeve 5, and the gravity for offsetting friction test specimen 8 influences, equipped with loading spring 12, pad in stop sleeve 5 Piece 11 and pressure sensor 13, loading spring 12 be used for friction test specimen 8 apply load, 13 both ends of pressure sensor respectively with rub Part 8 is wiped to be connected with gasket 11, for measuring the normal load of friction test specimen 8, the one end for the test specimen 8 that rubs and stop sleeve 5 For clearance fit, the friction surface 6 contacted with friction test specimen 8 is installed in rack 9.When work, stop sleeve 5 is in electromechanical actuation It is moved under the driving of device 1 along 3 direction of line slide rail, to make friction test specimen 8 that phase occur with friction surface 6 under external load function To movement.

Based on the method that above-mentioned apparatus carries out friction parameter test, include the following steps:

Step 1:Before the frictional force of measurement friction test specimen 8 and friction surface 6, elastic lifting rope 7 and line slide rail are first measured The 3 resistance resultant forces generated, detailed process is as follows:Friction test specimen 8 is not installed, with the equal box nut of friction 8 mass of test specimen, and The external screw thread of stop sleeve 5 screws, and controls electromechanical actuator 1 with displacement model uniform motion, records one group of high-precision tension and compression and pass The registration F of sensor 21, the as resistance resultant force that generates of elastic string 6 and line slide rail 3;

Step 2:Box nut is unloaded, the installation friction test specimen 8 in stop sleeve 5, using control mould identical with step 1 Formula obtains the registration F of one group of high-precision tension-compression sensor 22

Step 3:The registration value F that step 2 obtains2Subtract the corresponding resulting resistance resultant force F of step 11And ask it average It is worth to get the frictional force of friction test specimen 8 and friction surface 6 is arrived;The registration of pressure sensor 13 is the big of normal load simultaneously Small, the ratio of frictional force and normal load is coefficient of friction under this condition.

Further, it is also possible to change normal load by replacement loading spring 12, by adjusting the operation of electromechanical actuator 1 Speed changes different friction pair materials or different friction texture surfaces to study normal load, speed of related movement, friction The influence of auxiliary material and friction surface situation to coefficient of friction.

The present invention have the characteristics that structure it is simple, not by time restriction, alterability is strong, high reliablity and at low cost.

Detailed description of the invention

Fig. 1 is the axonometric drawing of the friction test device of achievable vacuum microgravity environment simulation of the present invention

Fig. 2 is the axonometric drawing of other components of the present invention in addition to vacuum tank

Fig. 3 is the axonometric drawing of other components of the present invention in addition to vacuum tank and rack

Fig. 4 is the sectional view of friction test specimen, stop sleeve and stop sleeve inner body

Wherein:1- electromechanical actuator;2- high-precision pull pressure sensor;3- line slide rail;4- guide rail slide block;5- support sleeve Cylinder;6- friction surface;7- elasticity lifting rope;8- friction test specimen;9- rack;10- vacuum tank;11- gasket;12- loading spring;13- Pressure sensor.

Specific embodiment

The present invention is explained in detail with reference to the accompanying drawing:

A kind of friction test device of achievable vacuum microgravity environment simulation, the friction test platform are placed in vacuum tank 10 In, and friction test specimen gravity is offset by suspension method.It is characterized in that:Testing stand mainly includes electromechanical actuator 1, high-precision Spend pull pressure sensor 2, line slide rail 3, guide rail slide block 4, stop sleeve 5, friction surface 6, elastic lifting rope 7, friction test specimen 8, Rack 9, vacuum tank 10, gasket 11, loading spring 12 and pressure sensor 13 are constituted.Package unit is placed in vacuum tank 10, Electromechanical actuator 1 is connect with high-precision tension-compression sensor 2, and high-precision tension-compression sensor 2 is connect with the pedestal of stop sleeve 5, branch Support set cylinder 5 is fixed on the guide rail slide block 4 of line slide rail 3, and elastic 7 upper end of lifting rope is fixed in rack 9, lower end and stop sleeve 5 connections, are equipped with loading spring 12, gasket 11 and pressure sensor 13 in stop sleeve 5,13 both ends of pressure sensor respectively with rub It wipes part 8 to be connected with gasket 11, the one end for the test specimen 8 that rubs and stop sleeve 5 are clearance fit, friction surface 6 and line slide rail 3 It is mounted in rack 9, the end that furthermore stop sleeve 5 and friction test specimen 8 cooperate is machined with external screw thread.

The rotary motion of motor is converted into moving along a straight line by the electromechanical actuator 1, and stop sleeve 5 is in electromechanical actuator It is moved under 1 driving, makes friction test specimen 8 that relative motion occur with friction surface 6 under external load function.

The high-precision tension-compression sensor 2 is used to measure the tangential friction force of direction of relative movement.

The elastic lifting rope 7 is connected to stop sleeve 5, for balanced support sleeve 5 and its inside loading spring 12, The gravity of gasket 11, pressure sensor 13 and the friction of stop sleeve end test specimen 8, with stimulated microgravity.

The pressure sensor 13 is used to measure the normal force that loading spring 12 is applied to friction test specimen 8.

The course of work of the invention is as follows:Test measurement rubs test specimen 8 with before the frictional force of friction surface 6, first measures bullet Property lifting rope 7 and line slide rail 3 generate resistance resultant force.Friction test specimen 8 is not installed, using the lid equal with friction 8 mass of test specimen Nut and 5 external screw thread of stop sleeve screw, and control electromechanical actuator 1 with displacement model uniform motion, high-precision tension-compression sensor 2 Registration be resistance resultant force that elastic lifting rope 6 is generated with line slide rail 3.Box nut is unloaded, installation rubs in 5 end of stop sleeve Part 8 is wiped, the registration of high-precision tension-compression sensor 2 is obtained using identical control model, the registration obtained at this time subtracts front Resulting resistance resultant force, the frictional force of as rub test specimen 8 and friction surface 6.Although electromechanical actuator 1 is at the uniform velocity mode fortune It is dynamic, but the meeting of spring lifting rope 7 run-off the straight in motion process, thus the test specimen 8 that rubs is covered with 6 relative motion of friction surface and installation The sensor registration for each resistance resultant force that nut obtains all is that real-time change, the two are subtracted each other and be averaged at any time Obtain the secondary frictional force of friction.The registration of pressure sensor 13 is the normal load of friction test specimen 8, frictional force and normal load Ratio be the coefficient of friction of the friction pair in vacuum microgravity environment.

Further, it is also possible to change normal load by replacement loading spring 12, by adjusting the operation of electromechanical actuator 1 Speed changes the modes such as different friction pair materials or different grain surfaces to study normal load, speed of related movement, rub Wipe the influence of auxiliary material and grain surface, various different factors to coefficient of friction.

Claims (2)

1. a kind of friction test device of achievable vacuum microgravity environment simulation, is tried including a friction being placed in vacuum tank Platform is tested, which offsets friction test specimen gravity by suspension method, specifically, the frictional experiment device is mainly made by electromechanics Dynamic device 1, high-precision pull pressure sensor 2, line slide rail 3, guide rail slide block 4, stop sleeve 5, friction surface 6, elastic lifting rope 7, Rub test specimen 8, rack 9, vacuum tank 10, gasket 11, loading spring 12 and pressure sensor 13;Package unit is placed on vacuum tank In 10, the rotary motion of motor is converted into linear motion output by electromechanical actuator 1, and output end connects high-precision tension and compression sensing Device 2, high-precision tension-compression sensor 2 are connect with the pedestal of stop sleeve 5, and stop sleeve 5 is fixed on the guide rail slide block of line slide rail 3 On 4, line slide rail 3 is installed in rack 9;Rack 9 is fixed in elastic 7 upper end of lifting rope, and lower end is connected with stop sleeve 5, is used for The gravity for offsetting friction test specimen 8 influences, and loading spring 12, gasket 11 and pressure sensor 13 are housed in stop sleeve 5, loads bullet Spring 12 is used to apply load to friction test specimen 8, and 13 both ends of pressure sensor are connected with friction test specimen 8 and gasket 11 respectively, uses In the normal load of measurement friction test specimen 8, the one end for the test specimen 8 that rubs and stop sleeve 5 are clearance fit, are connect with friction test specimen 8 The friction surface 6 of touching is installed in rack 9;When work, stop sleeve 5 is under the driving of electromechanical actuator 1 along 3 side of line slide rail To movement, to make friction test specimen 8 that relative motion occur with friction surface 6 under external load function.
2. being included the following steps based on the method that device as described in claim 1 carries out friction parameter test:
Step 1:Before the frictional force of measurement friction test specimen 8 and friction surface 6, first measures elastic lifting rope 7 and produced with line slide rail 3 Raw resistance resultant force, detailed process is as follows:Friction test specimen 8 is not installed, with the box nut equal with friction 8 mass of test specimen, and branch The external screw thread of support set cylinder 5 screws, and controls electromechanical actuator 1 with displacement model uniform motion, records one group of high-precision tension and compression sensing The registration F of device 21, the as resistance resultant force that generates of elastic string 6 and line slide rail 3;
Step 2:Box nut is unloaded, the installation friction test specimen 8 in stop sleeve 5, using control model identical with step 1, Obtain the registration F of one group of high-precision tension-compression sensor 22
Step 3:The registration value F that step 2 obtains2Subtract the corresponding resulting resistance resultant force F of step 11And be averaged, i.e., Obtain the frictional force of friction test specimen 8 and friction surface 6;The registration of pressure sensor 13 is the size of normal load simultaneously, is rubbed The ratio of wiping power and normal load is coefficient of friction under this condition.
CN201810270396.XA 2018-03-29 2018-03-29 A kind of friction test device and friction parameter test method of achievable vacuum microgravity environment simulation CN108827870A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010117233A (en) * 2008-11-13 2010-05-27 Kinugawa Rubber Ind Co Ltd Friction testing device
CN103466109A (en) * 2013-09-05 2013-12-25 哈尔滨工业大学 Space microgravity environment ground simulation experiment device
CN105954017A (en) * 2016-05-10 2016-09-21 西北工业大学 Planetary roller screw pair friction torque measurement device
CN106404579A (en) * 2016-10-17 2017-02-15 华南理工大学 Friction-wear testing machine capable of realizing variable gravity orientation and testing method
CN107101901A (en) * 2016-02-19 2017-08-29 中国石油化工股份有限公司 A kind of reciprocating friction abrasion test device and method
CN107356524A (en) * 2017-06-20 2017-11-17 西安理工大学 The frictional wear test device of wear extent on-line measurement under a kind of vacuum environment
CN107817185A (en) * 2017-11-22 2018-03-20 华南理工大学 One kind falls tower frictional wear test device and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010117233A (en) * 2008-11-13 2010-05-27 Kinugawa Rubber Ind Co Ltd Friction testing device
CN103466109A (en) * 2013-09-05 2013-12-25 哈尔滨工业大学 Space microgravity environment ground simulation experiment device
CN107101901A (en) * 2016-02-19 2017-08-29 中国石油化工股份有限公司 A kind of reciprocating friction abrasion test device and method
CN105954017A (en) * 2016-05-10 2016-09-21 西北工业大学 Planetary roller screw pair friction torque measurement device
CN106404579A (en) * 2016-10-17 2017-02-15 华南理工大学 Friction-wear testing machine capable of realizing variable gravity orientation and testing method
CN107356524A (en) * 2017-06-20 2017-11-17 西安理工大学 The frictional wear test device of wear extent on-line measurement under a kind of vacuum environment
CN107817185A (en) * 2017-11-22 2018-03-20 华南理工大学 One kind falls tower frictional wear test device and method

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