CN103499489B - A kind of across yardstick, various visual angles in-situ mechanical motion capture test platform - Google Patents

A kind of across yardstick, various visual angles in-situ mechanical motion capture test platform Download PDF

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CN103499489B
CN103499489B CN201310478177.8A CN201310478177A CN103499489B CN 103499489 B CN103499489 B CN 103499489B CN 201310478177 A CN201310478177 A CN 201310478177A CN 103499489 B CN103499489 B CN 103499489B
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screw
yardstick
visual angles
imaging system
test
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CN103499489A (en
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张志辉
王书鹏
任露泉
赵宏伟
梁云虹
朱冰
李凌
余轩
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Jilin University
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Jilin University
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Abstract

A kind of across yardstick, various visual angles in-situ mechanical motion capture test platform, comprise the control system, vibration isolation experiment table, the mechanical test instrument that are made up of computing machine, the positioning screw hole that vibration isolation laboratory bench top has dot matrix to distribute, the control system that mechanical test instrument consists of data line and computing machine is connected, it is characterized in that multiple dynamic imaging device is fixed on around precision mechanics tester, each imaging device is equipped with a secondary light source and forms imaging system, and the control system that imaging device consists of data line and computing machine is connected.The assembling of this test platform flexibly, diverse in function, for the mechanical property research of the subjects such as machinery, material and detection provide science, effective measure, testing result for from the dynamic monitoring of multiple visual angles and disclose mechanical behavior under multiple dimensioned of material or test specimen and failure mechanism significant, Aero-Space, auto industry, biomedicine, the different engineering field such as micro electronmechanical can be widely used in.

Description

A kind of across yardstick, various visual angles in-situ mechanical motion capture test platform
Technical field
The present invention relates to mechanical property test and the detecting instrument of material, be specifically related to a kind of across yardstick, various visual angles in-situ mechanical multidate information seizure test platform.
Background technology
The mechanical property of material refers to that material is under varying environment (temperature, medium, humidity), bear various plus load (stretch, compression, bending, torsion, impact, alterante stress etc.) time the mechanical characteristics that shows.It weighs the Main Basis that quality of materials is good and bad, design various engineering structure reasonable material.Usually, the mechanical property of material measures mainly through tension and compression, torsion, impression, the various testing machine such as bending.Traditionally, no matter be dynamic and static load, or environmental baseline, Mechanics Performance Testing under fluctuating load, its test result all to implement the variable quantity after load as test foundation, and can not Real-Time Monitoring load implement in the micro-change of material, damage is until the dynamic process of destruction.Especially along with the development of Aeronautics and Astronautics technology and material science and military science, the material parameter that classical macroscopic material mechanical property test instrument and equipment is tested and performance oneself through can not the Complete Characterization material Performance Characteristics of being on active service in more small scale and maximum conditions, need to introduce test more directly perceived, accurate, observation and analysis means, with this, mechanical behavior of material and failure mechanism are effectively analyzed and furtherd investigate.
For explore and disclose solid-state material drawing-press-curved-to turn round etc. under load grand-microcosmic across the dynamic deformation behavior of yardstick, domestic and international minority mechanism is just being devoted to the microcosmic imaging means such as development learns a skill in conjunction with electron microscopic, Laser scanning confocal microscopy technology, X-ray diffraction technology, for close to measure under service condition solid-state material dynamically, the in-situ testing technique of Micro Mechanical Properties.This measuring technology can not only measure the various mechanics parameters of material, and can carry out in real time the microdeformation of material in experimentation and damage process, online observation, iconology qualitative analysis is combined with data quantitative analysis, disclose the process of material deformation damage under extraneous load effect with the visual field upgraded and test angle, find more novel phenomenon and rule.
But, current research work only can be observed from the mechanical test of certain single angle to test specimen, also do not consider to test specimen carry out across yardstick, various visual angles in-situ observation, special shortage is a set of can simultaneously from multiple visual angle, collection routine, high definition, the test platform that dynamically capture apparatus is integrated at a high speed, and solving Related Technical Issues, this can miss testing site useful in a large number undoubtedly, affects the multianalysis to dynamic experiments data.Therefore, design invention is a kind of to be caught across yardstick, multi-vision angle video image, high accuracy in-situ mechanical test, the test platform system that collection routine, high definition, the monitoring of high speed dynamic process are implemented with each function-stable is very necessary, this invention not only can the process that deeply discloses of accelerated material in-situ mechanical, also will fill up the blank of this aspect testing tool development.
Summary of the invention
The object of the present invention is to provide a kind of across yardstick, various visual angles in-situ mechanical motion capture test platform, can across yardstick, from various visual angles, multi-frequency dynamic image capture, and can effectively avoid test vibration to cause between device the in-situ mechanical test platform of interference mutually.By multiple image devices of dynamic imaging system, various visual angles visual field on-line monitoring simultaneously can be realized; By free adjustment dynamic imaging system, the captured in real-time of different enlargement ratio and different motion speed dynamic image can be realized; Changing mechanical testing instrument by freely selecting, can realize comprising the in-situ test of the multiple mechanical properties such as stretching/compressing, torsion, impression, bending and various fatigues; Meanwhile, each device is independent on vibration isolation experiment table respectively to be installed, and available buffer also reduces the impact shock because test piece deformation, fracture etc. cause, thus improves picture catching quality and data testing accuracy.In test platform, each device coordinating and unifying, solves in existing mechanical test and only can obtain test data and result, can not the problem of omnidistance dynamically various visual angles monitoring and test process.
Above-mentioned purpose of the present invention is achieved through the following technical solutions, and accompanying drawings is as follows:
A kind of across yardstick, various visual angles in-situ mechanical motion capture test platform, primarily of control system 1, vibration isolation experiment table 7, be fixedly mounted on precision mechanics tester 2 on vibration isolation experiment table 7 and dynamic imaging system 3 forms,
Described dynamic imaging system 3 is made up of multiple image device and secondary light source 4, each image device and secondary light source 4 are fixedly mounted on vibration isolation experiment table 7 respectively by dynamic imaging system mounting bracket 6 and flexible support 5, and become different angles, height is stragglyly distributed in precision mechanics tester 2 around, the dynamic image capture effect that it is target that all image devices all have with test specimen 23, the control system that described dynamic imaging system 3 consists of data line and computing machine is connected.
Described dynamic imaging system 3 needs by test, choosing fills conventional picture pick-up device, high-definition monitoring device or high-speed camera device, the technical parameter of described conventional picture pick-up device is: resolution 640 × 480-1920 × 1080 pixel, zoom 1 times-80 times, shooting frame per second 30 hardwood-50 hardwood/second;
The technical parameter of described high-definition monitoring device is: resolution 1280 × 720-1920 × 1080 pixel, zoom 1 times-30 times, shooting frame per second 30 hardwood-50 hardwood/second;
The technical parameter of described high-speed camera device is: resolution 384 × 288-1280 × 960 pixel, filming frequency 30 hardwood-10000 hardwood/seconds, zoom 1 times-50 times.
Described precision mechanics tester 2 is vertical structure, primarily of motor 29, turbine and worm mechanism, leading screw 28, feed rod 22, fixture and pull pressure sensor 21 form, described motor 29 is installed on base 13 by flange holder, upright two leading screws be arranged symmetrically with 28 in motor 29 both sides, leading screw 28 is fixed on upper lower clamp mount pad 26 by upper and lower feed screw nut seat 24, and be separately fixed on footstock 25 and base 13 by upper and lower lead screw shaft bearing 19, two upright and the feed rod 22 be arranged symmetrically with is fixed on upper lower clamp mount pad 26 by upper and lower 2 linear bearings 20, upper lower clamp 27 is separately fixed on lower clamp mount pad 26, pull pressure sensor 21 is connected on lower clamp mount pad 26, two rhizoid thick sticks 28 drive rotation to make upper lower clamp 27 along the oppositely relative movement of two feed rod 22 by motor 29 by double lead-screw turbine and worm pair, test specimen 23 is stretched or compresses.
Described dynamic imaging system mounting bracket 6 by connected vertically move up and down frame 11 and move left and right frame 12 form, the described frame 11 that moves up and down is fixed on bracket base 10, its position is adjustable, described move up and down frame 11 and move left and right frame 12 be respectively socket, and carry out position and angular adjustment by adjusting bolt 9 respectively, described dynamic imaging system 3 is arranged on and moves left and right on frame 12.
Described vibration isolation experiment table 7 natural frequency is not more than 6Hz, amplitude≤5um, surface smoothness≤1.6um, flatness≤0.1mm/m 2.
Described secondary light source 4 is determined depending on on-the-spot light conditions, and it exposes to the reference color temperature that surface of test piece can reach need reach 5000-6000K.
Described double lead-screw 28 is installed on instrument respectively by bearing by lead screw shaft bearing 19, in vertical parallel distribution; Double lead-screw 28 by four feed screw nuts up and down fixture mount pad dynamic force and motion is provided; A low speed worm gear 16 is installed in each leading screw lower end, whole instrument is driven by single motor 29, power is exported by the output shaft of drive motor 29 with motion, after being slowed down by first-stage worm gear worm gear pair, power is separated by the axial left and right sides of high-speed worm gear with motion, a low speed worm screw 18 is respectively installed at two ends, high-speed worm gear axle left and right, and low speed worm screw 18 and low speed worm gear 16 form second-stage worm gear worm gear pair, transmit power and motion respectively to double lead-screw 28.
Beneficial effect of the present invention is: for the different demands of high precision mechanical test, while realization obtains subsized specimen conventional mechanical property data, can also under macroscopic view or micro-scale, carry out precise monitoring from multiple visual angle to the Mechanics Performance Testing process of test specimen simultaneously, the high-quality dynamic video signal of real-time acquisition, solve in existing mechanical test and only can obtain test data and result, can not the problem of omnidistance dynamically various visual angles monitoring and test process, and by taking the reasonable selection of device and mechanical testing instrument in test platform, support the Reasonable Orientation with fastening structure, avoid because test vibration is on the impact of testing result, thus improve the accuracy of data, comprehensive, reliability.This test platform aims at mechanics study forward position, monitoring comprehensively, diverse in function, strong innovation, for the mechanical property research of the subjects such as machinery, material and detection provide science, effective measure, testing result for disclose mechanical behavior under multiple dimensioned of material or test specimen and failure mechanism significant.Meanwhile, this test platform also can be widely used in Aero-Space, auto industry, biomedicine, numerous engineering field such as micro electronmechanical, has higher scientific research value and good Commercial Prospect.
Accompanying drawing explanation
Fig. 1 is overall appearance structural representation of the present invention;
Fig. 2 is the structural representation of dynamic imaging system of the present invention;
Fig. 3 is the structural representation of vertical in-situ mechanical testing tool of the present invention.
In figure: 1, control system; 2, precision mechanics testing tool; 3, dynamic imaging system; 4, secondary light source; 5, flexible support; 6, dynamic imaging system mounting bracket; 7, vibration isolation experiment table; 8, translucent cover; 9, adjusting bolt; 10, bracket base; 11, frame is moved up and down; 12, frame is moved left and right; 13, base; 14, high speed worm screw; 15, high-speed worm gear; 16, low speed worm gear; 17, fixed bolt hole; 18, low speed worm screw; 19, lead screw shaft bearing; 20, linear bearing; 21, pull pressure sensor; 22, feed rod; 23, test specimen; 24, feed screw nut seat; 25, footstock; 26, fixture mount pad; 27, upper and lower fixture; 28, leading screw; 29, motor.
Embodiment
Particular content of the present invention and embodiment thereof is further illustrated below in conjunction with accompanying drawing illustrated embodiment.
One of the present invention across yardstick, various visual angles in-situ mechanical motion capture test platform, can across yardstick, from various visual angles, multi-frequency dynamic image capture, and can effectively avoid test vibration to cause the in-situ mechanical test platform of interference mutually between device.
One, the positioning screw hole that vibration isolation experiment table 7 table top has dot matrix to distribute, precision mechanics tester 2 is installed on the suitable positioning screw hole place of vibration isolation experiment table 7 table top by set bolt, the control system that mechanical test instrument consists of data line and computing machine is connected, multiple dynamic imaging device is fixed on around precision mechanics tester, each imaging device is equipped with a secondary light source 4 and forms imaging system, the control system that imaging device consists of data line and computing machine is connected, respectively there is an elongate holes that base fixed position can be made to change frame bottom both sides, bracket base is fixed on vibration isolation experiment table positioning screw hole by fastening bolt, the pillar moving up and down frame 11 inserts perpendicular in cylinder type hollow sleeve pipe fixing on bracket base center, the top of sleeve pipe side has one for regulating the adjusting bolt 9 moving up and down frame high and low position, Image-forming instrument is fixed on the one end moving left and right frame 12, the pillar moving left and right frame is perpendicular to moving up and down frame and through being arranged in the cylinder type hollow trepanning moving up and down frame top, the middle part of trepanning side has one for regulating the adjusting bolt moving left and right frame right position, frame bottom one end is fixed with for supporting secondary light source 4 and regulating the flexible support 5 of light source position, cantilever tip is provided with flexible light source.
Two, precision mechanics tester is vertical structure, the corner of base 13 has fixed bolt hole 17 respectively, motor 29 is installed on base by flange holder, both sides respectively have one to be fixedly connected with low speed turbine 16 perpendicular to bottom the leading screw 28 of motor rectilinear direction, and respectively with the high speed worm screw 14 of both sides, high speed turbine 15, it is secondary that low speed worm screw 18 forms double lead-screw turbine and worm, leading screw passes the feed screw nut seat 24 of lead screw shaft bearing 19 and lower removable platform, both sides respectively have a feed rod being parallel to motor rectilinear direction pass the linear bearing 20 of lower removable platform and be fixed in the circular hole of lead screw shaft bearing both sides, lower removable platform top center place is fixed with pull pressure sensor 21, transducer tip is fixed with lower clamp 27, upper fixture 27 top is fixed on bottom the fixture mount pad 26 of top movable platform center, two feed screw nut seats 24 on top movable platform and two linear bearings 20 are each passed through two rhizoid thick sticks and two feed rods, two lead screw shaft bearings 19 on footstock 25 are socketed in two rhizoid thick stick tops, two feed rod tops are fixed by two circular holes on footstock.Other are with embodiment one.
Consult Fig. 1 to Fig. 3, of the present invention across yardstick, various visual angles in-situ mechanical motion capture test platform, comprise the parts such as control system 1, precision mechanics tester 2, dynamic imaging system 3, secondary light source 4, flexible support 5, dynamic imaging system mounting bracket 6, vibration isolation experiment table 7, translucent cover 8 and accessory structure.
Described control system 1 is connected with precision mechanics tester 2 and dynamic imaging system 3 through data line, by the control of software simulating to above-mentioned two kinds of devices, and Real-time Obtaining thus two devices function formed signal or data.
Described precision mechanics tester 2 can be vertical structure, is made up of parts such as base 13, high speed worm screw 14, high-speed worm gear 15, low speed worm gear 16, fixed bolt hole 17, low speed worm screw 18, lead screw shaft bearing 19, linear bearing 20, pull pressure sensor 21, feed rod 22, test specimen 23, feed screw nut seat 24, footstock 25, fixture mount pad 26, upper and lower fixture 27, leading screw 28, motor 29.Wherein base 13 there is fixed bolt hole 17, motor 29 is installed on base 13 by flange holder, leading screw 28 is two, be fixed on base 13 by bearing and lead screw shaft bearing 19, feed rod 22 is two, can base for supporting 13 and footstock 25, can serve as again the effect of line slideway, pull pressure sensor 21 connects lower Mobile base and lower clamp, and upper fixture is connected with upper fixture mount pad 26.By the effect of double lead-screw pair of nut, upper and lower clamp body 27 can be made along the oppositely relative movement of two polished rod 22, to realize stretching to test specimen 23 or compression.Vertical in-situ mechanical tester can from the different angle of surrounding equipment to the in-situ observation of test specimen 23 mechanical test, to guarantee to obtain useful testing site.
Described dynamic imaging system 3 can according to test needs, and choosing fills conventional picture pick-up device, high-definition monitoring device and high-speed camera device.The technical parameter of conventional picture pick-up device is: resolution 640 × 480-1920 × 1080 pixel; Zoom 1 times-80 times; Shooting frame per second 30 hardwood-50 hardwood/second.The technical parameter of high-definition monitoring device is: resolution 1280 × 720-1920 × 1080 pixel; Zoom 1 times-30 times; Shooting frame per second 30 hardwood-50 hardwood/second.The technical parameter of high-speed camera device is: resolution 384 × 288-1280 × 960 pixel; Filming frequency 30 hardwood-10000 hardwood/seconds; Zoom 1 times-50 times.Realize, captured in real-time dynamic to the various visual angles of the test specimen 23 on precision mechanics tester 2.
Described secondary light source 4 can be selected to install according to on-the-spot light conditions, and secondary light source exposes to the reference color temperature that surface of test piece can reach need reach 5000-6000K.Secondary light source 4 is fixed on bracket base 10 by flexible support 5 by clamp nut, by the flexural deformation of flexible support 5, can regulate arbitrarily the irradiation position of secondary light source 4, for dynamic imaging system 3 provides best light source.
Described dynamic imaging system mounting bracket 6 by adjusting bolt 9, bracket base 10, move up and down frame 11, move left and right the part such as frame 12 and form.Wherein base 10 is fixed on the suitable positioning screw hole place of vibration isolation experiment table 7 by fastening bolt, position can before and after step-less adjustment; Move up and down frame 11 to be mutually socketed with bracket base 10, fastening by adjusting bolt 9, position can step-less adjustment up and down, also vertically can carry out angle step-less adjustment by movable stand 11 axis; Move left and right frame 12 and move up and down frame 11 and be mutually socketed, fastening by adjusting bolt 9, position can left and right step-less adjustment, also can carry out angle step-less adjustment along moving left and right frame 12 axis; Dynamic imaging system imaging device with move left and right frame and be connected by bolt.By above structure, five degree of freedom position adjustments of dynamic imaging system imaging device can be realized.
Described vibration isolation experiment table 7 natural frequency is not more than 6Hz, and amplitude is not more than 5um, and surface smoothness is not more than 1.6um, and flatness is not more than 0.1mm/m 2, stabilized structure is reliable, plays support, loads each test component and vibration isolation effect.
Described translucent cover 8 is installed on vibration isolation experiment table 7 by hinge, effectively can alleviate the interference of extraneous factor to test experiments, can be started by the handle of translucent cover 8 side the side being put into vibration isolation experiment table 7.
The present invention is in concrete test process, first, will according to test experiments need choose dissimilar precision mechanics tester 2, open translucent cover 8, with special set bolt, selected in-situ mechanical tester be arranged on the appropriate location of vibration isolation experiment table 7, secondly, by the requirement of selected precision mechanics tester 2, the materials processing that will test is become standard-sized test exemplar, and utilize small-sized buffing machine to carry out to test specimen the better surface smoothness that polishing obtains can be used for the monitoring of high resolving power micro-imaging, then, be installed on the fixture of precision mechanics tester 2 by the experiment exemplar processed, location clamping is to be measured, again, regulating system, opening control 1 and dynamic imaging system 3 respectively, each image device of dynamic imaging system 3 is made with suitable angle and distance just to the appropriate location of test specimen by adjusting each dynamic imaging system mounting bracket 6, secondary light source 4 is made to be in suitable position by regulating flexible support 5, open secondary light source 4, again regulate the position of each image device of dynamic imaging system 3 and the position of the focal length of camera lens and aperture size and secondary light source 4, test specimen is enable to present the image of complete display, close secondary light source 4, close translucent cover 8, setup test, finally, start test, again open secondary light source 4, open distortion or the load control mode of specified load test, beginning test process is driven in the mode that pulse exports, namely by testing algorithm program setting test condition and parameter, under the effect of time sequential pulse control signal, precision DC servomotor exports precise angular displacement, final realization is to the Ultra-Low Speed semi-static load of standard specimen, sophisticated sensor in test process on precision mechanics tester 2 detects load F, and makes necessary correcting process by algorithm routine, simultaneously the deflection h of test specimen is synchronously picked up by the precise displacement sensor on precision mechanics tester 2, and two paths of signals is by analog to digital conversion and send into computing machine after carrying out necessary signal condition.In the whole process of test, the deformation damage situation of tested standard specimen material under load effect carries out various visual angles dynamic monitoring simultaneously by dynamic imaging system 3, and carry out this recording a video and preserving, also can stress-strain curves, elastic modulus, yield strength, the important mechanics parameter such as shear modulus and breakdown strength of Real-time Obtaining exosyndrome material mechanical property by host computer debugging software.By the analysis to the microdeformation of material structure and destruction thereof, damage status video, coordinate the data of exosyndrome material mechanical property, just can further investigate the deformation damage of material under load effect mechanism and mechanics military service behavior, thus the performance of more thorough Knowing material.

Claims (6)

1. one kind across yardstick, various visual angles in-situ mechanical motion capture test platform, primarily of control system (1), vibration isolation experiment table (7), be fixedly mounted on precision mechanics tester (2) on vibration isolation experiment table (7) and dynamic imaging system (3) composition, it is characterized in that:
Described dynamic imaging system (3) is made up of multiple image device and secondary light source (4), each image device and secondary light source (4) are fixedly mounted on vibration isolation experiment table (7) respectively by dynamic imaging system mounting bracket (6) and flexible support (5), and become different angles, height is straggly is distributed in precision mechanics tester (2) around, the dynamic image capture effect that it is target that all image devices all have with test specimen (23), the control system that described dynamic imaging system (3) consists of data line and computing machine is connected,
Described precision mechanics tester (2) is vertical structure, primarily of motor (29), turbine and worm mechanism, leading screw (28), feed rod (22), fixture and pull pressure sensor (21) composition, described motor (29) is installed on base (13) by flange holder, upright two leading screws be arranged symmetrically with (28) in motor (29) both sides, leading screw (28) is fixed on upper lower clamp mount pad (26) by upper and lower feed screw nut seat (24), and be separately fixed on footstock (25) and base (13) by upper and lower lead screw shaft bearing (19), two upright and the feed rod be arranged symmetrically with (22) is fixed on upper lower clamp mount pad (26) by upper and lower 2 linear bearings (20), upper lower clamp (27) is separately fixed on lower clamp mount pad (26), pull pressure sensor (21) is connected on lower clamp mount pad (26), two rhizoid thick sticks (28) drive rotation to make upper lower clamp (27) along the oppositely relative movement of two feed rods (22) by motor (29) by double lead-screw turbine and worm pair, test specimen (23) is stretched or compression.
2. according to claim 1 across yardstick, various visual angles in-situ mechanical motion capture test platform, it is characterized in that:
Described dynamic imaging system (3) needs by test, choosing fills conventional picture pick-up device, high-definition monitoring device or high-speed camera device, the technical parameter of described conventional picture pick-up device is: resolution 640 × 480-1920 × 1080 pixel, zoom 1 times-80 times, shooting frame per second 30 hardwood-50 hardwood/second;
The technical parameter of described high-definition monitoring device is: resolution 1280 × 720-1920 × 1080 pixel, zoom 1 times-30 times, shooting frame per second 30 hardwood-50 hardwood/second;
The technical parameter of described high-speed camera device is: resolution 384 × 288-1280 × 960 pixel, filming frequency 30 hardwood-10000 hardwood/seconds, zoom 1 times-50 times.
3. according to claim 1 across yardstick, various visual angles in-situ mechanical motion capture test platform, it is characterized in that:
Described dynamic imaging system mounting bracket (6) by connected vertically move up and down frame (11) and move left and right frame (12) form, the described frame (11) that moves up and down is fixed on bracket base (10), its position is adjustable, described move up and down frame (11) and move left and right frame (12) be respectively socket, and carry out position and angular adjustment by adjusting bolt (9) respectively, described dynamic imaging system (3) is arranged on and moves left and right on frame (12).
4. according to claim 1 across yardstick, various visual angles in-situ mechanical motion capture test platform, it is characterized in that:
Described vibration isolation experiment table (7) natural frequency is not more than 6Hz, amplitude≤5um, surface smoothness≤1.6um, flatness≤0.1mm/m 2.
5. according to claim 1 across yardstick, various visual angles in-situ mechanical motion capture test platform, it is characterized in that:
Described secondary light source (4) is determined depending on on-the-spot light conditions, and it exposes to the reference color temperature that surface of test piece can reach need reach 5000-6000K.
6. according to claim 1 across yardstick, various visual angles in-situ mechanical motion capture test platform, it is characterized in that:
Described double lead-screw (28) is installed on instrument respectively by bearing by lead screw shaft bearing (19), in vertical parallel distribution; Double lead-screw (28) by four feed screw nuts up and down fixture mount pad dynamic force and motion is provided; A low speed worm gear (16) is installed in each leading screw lower end, whole instrument is driven by single motor (29), power is exported by the output shaft of drive motor (29) with motion, after being slowed down by first-stage worm gear worm gear pair, power is separated by the axial left and right sides of high-speed worm gear with motion, a low speed worm screw (18) is respectively installed at two ends, high-speed worm gear axle left and right, low speed worm screw (18) and low speed worm gear (16) form second-stage worm gear worm gear pair, transmit power and motion respectively to double lead-screw (28).
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