CN103411551A - Soil body sample tiny deformation imaging detecting device and method - Google Patents
Soil body sample tiny deformation imaging detecting device and method Download PDFInfo
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- CN103411551A CN103411551A CN2013103801596A CN201310380159A CN103411551A CN 103411551 A CN103411551 A CN 103411551A CN 2013103801596 A CN2013103801596 A CN 2013103801596A CN 201310380159 A CN201310380159 A CN 201310380159A CN 103411551 A CN103411551 A CN 103411551A
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Abstract
The invention relates to sample tiny deformation measurement in the field of soil test, in particular to tiny deformation measurement of a soil body sample of a soil engineering centrifugal machine, and discloses a soil body sample tiny deformation imaging detecting device which comprises the soil engineering centrifugal machine. The soil engineering centrifugal machine comprises a soil engineering centrifugal machine rotating shaft. The lower end of the soil engineering centrifugal machine rotating shaft is connected with a weight box rotating arm and a model box rotating arm. One end, close to the soil engineering centrifugal machine rotating shaft, of the model box rotating arm is provided with an adjustable camera support in an erecting mode. The adjustable camera support is fixedly provided with a high-resolution camera. A model box upper support is arranged on an organic glass window of a model box. A reflection mirror support is erected on the model box upper support and is provided with a reflection mirror. The soil body sample is arranged in the model box. A fixing reference coordinate mesh is arranged on the inner side face of transparent window organic glass of the model box. The invention further discloses a method for soil body sample imaging detecting with the soil body sample tiny deformation imaging detecting device.
Description
Technical field
The micro-deformation of sample that the present invention relates to the soil test field measures, and the micro-deformation of soil body sample that relates in particular to the building hydro-extractor measures.
Background technology
Geotechnical centrifuge 1 is to cause with the on-the-spot earth stress of shop experiment simulation digging the large-scale shop test equipment be out of shape.The centrifugal force produced when the suffered acting force of the soil body that model casing is 2 li rotates from hydro-extractor.Centrifuge speed is directly proportional to centrifugal force, and hydro-extractor is adjusted rotating speed by control system and reached the pressure that the test of model clay body needs.
Large geotechnical centrifuge 1 consists of the ballast box of the model casing 2 of pivot arm, the column be connected with pivot arm, pivot arm one end and the other end and driving and control system.During operation, by supporting imaging system, the geotechnical model of model casing 2 the insides of High Rotation Speed is taken pictures, to obtain the geotechnical model dynamic change engineering under centrifugal stress.
Existing geotechnical centrifuge 1 image-forming detecting system adopts more is opened a window above Centrifuge Room, window place priming illumination light source and a photograph camera.In the time of hydro-extractor work, Centrifuge Room becomes a totally enclosed space.When the rotating speed of hydro-extractor reached testing requirements, model casing 2 forwarded in the zone of taking a picture according to camera, triggers according to camera shutter, takes an image.Often rotate a circle, can photographic images number≤1.By the observation analysis to photographic images, obtain the information of soil body sample stress and deformation.But there is defect in this method: in centrifuge test, shine
Phase system is fixed on the concrete roof of Centrifuge Room, the model casing 2 of hydro-extractor spiral arm end is in the circular motion state, the imaging system and the model casing on spiral arm 2 that are fixed on concrete roof are worked under the relative motion pattern, the image generation image motion obtained is fuzzy.The fuzzy soil sample deformation quantity that directly causes of image can not accurately measure.Centrifuge speed is higher, and image is fuzzyyer, and the soil sample deformation quantity precision recorded is lower.
In order to address the above problem, application number is 201010262816.3, name is called a kind of imaging device of large geotechnical centrifuge 1 existing imaging system has been made to improvement, and the device after improvement can be taken over against any point of model, and the relatively existing imaging system of the sharpness of image is higher.But the micro-distortion measurement effect of the soil sample of the described imaging device of this patent is poor.Because the model deformation quantity of geotechnical centrifuge 1 is 1/60 of on-the-spot actual deformation quantity, that is to say and will say that the model deformation quantity is multiplied by 60 and just can obtains on-the-spot deformation quantity, the demand of the not competent micro-deformation analysis of imaging system of the described device of this patent.Simultaneously, after the geotechnical centrifuge rotating speed improved, camera and camera lens thereof are stressed reached hundreds of kilograms, very easily causes the damage of camera and parts thereof.
Summary of the invention
The object of the present invention is to provide imaging detection device and the method for the micro-deformation of a kind of soil body sample.This device can be taken the model any point, accurately obtains miniature variable, and cost is low, easy to implement.
The technical solution adopted for the present invention to solve the technical problems is: the imaging detection device of the micro-deformation of a kind of soil body sample, comprise geotechnical centrifuge, described geotechnical centrifuge comprises geotechnical centrifuge turning axle 1, described geotechnical centrifuge turning axle 1 lower end is connected with ballast box pivot arm 4 and model casing pivot arm 7, it is characterized in that: near geotechnical centrifuge turning axle 1 one ends, set up adjustable camera mount at model casing pivot arm 7, on adjustable camera mount, be fixed with high-resolution camera 12, on the emissive plastic glazing 18 of model casing, model casing upper bracket 14 is installed, at the added reflector bracket 17 that is provided with of model casing upper bracket 14, on described reflector bracket 17, be provided with reflective mirror 15, described adjustable camera mount, camera is electrically connected to recording controller respectively.
Further, described adjustable camera mount comprises camera base, and described high-resolution camera 12 is fixed on camera base, and camera base is comprised of x traversing guide 9 and z traversing guide 10 and angle of pitch governor motion 11.
Further, on reflector bracket 17, be provided with model lighting source 16, described reflective mirror 15 is 45 ° of angles with the glass planar of model casing emissive plastic glazing 18.
Further, described high-resolution camera 12 camera lenses are long burnt telecentric lens 13.
Further, the useful machinery of the described model casing emissive plastic glazing 18 medial surface mode of portraying or laser beam are burnt the mode direct etching of carving the fixed reference coordinate grid.
Further, the density of described fixed reference coordinate grid should guarantee the point of crossing of grid reference in every width image of camera >=4, and described fixed reference coordinate grid is orthogonal rectilinear(-al).
Further, the interior placement soil body of described model casing 5 sample, holding movable sign on soil body sample, Mobile sign are the transparent print spike.
Further, described Mobile sign figure spike head upper surface is the Mobile sign face, and the Mobile sign face is that described sign groove is cross curve with the face of sign groove, described cross curve be take the intersection point at cross spider edge in length and breadth and is positioned as gauge point, and the Mobile sign face is smeared transparent lubricant.
The invention also discloses a kind of method of utilizing imaging that technique scheme carries out the micro-deformation of soil body sample to detect, it is characterized in that, comprise the steps:
The reference frame of S1, structure soil sample micrometric displacement information, the fixed reference coordinate grid on use model casing emissive plastic glazing 18 medial surfaces is as benchmark;
S2, the fixed reference coordinate grid on model casing emissive plastic glazing 18 medial surfaces is measured obtain original state image document image each point coordinate figure under microcosmic, described fixed reference coordinate grid long measure is micron, and the ranks number of image are carried out to mark;
S3, figure spike Mobile sign is positioned on soil body sample, simultaneously each figure spike Mobile sign is carried out to coordinate sign and uniqueness sign, with a plurality of figure spike Mobile signs in once testing, has uniqueness, described figure spike Mobile sign is embedded in soil body sample, figure spike Mobile sign upper surface and soil body specimen surface are same plane, the upper surface that described figure spike Mobile sign is smeared transparent lubricant contacts with model casing emissive plastic glazing 18 medial surfaces, figure spike Mobile sign pinning enters in soil body sample to be fixed, figure spike Mobile sign moves with soil body sample in rotation test,
After S4, model casing 5 enter rotation test, obtain under the initial stressed state, specify under stress and the image of the interior soil body sample of specific location point model casing 5 of fixed time point with the imaging detection device of the micro-deformation of soil body sample;
S5, the image that S4 is obtained carry out camera distortion correction and image random distortion correction, and accurately the micrometric displacement of Mobile sign in reference frame on measurement image, comprise the steps:
S51, image that S4 is obtained are according to camera carries out in advance before test Distortion Detect, and each calibrating parameters of the camera obtained carries out the resampling of position and pixel value;
S52, the same place that the measured data of the intersect edge point of the cross spider in length and breadth of fixed reference coordinate grid in the original state image obtained in S2 and image ranks number are formed mate calculating, obtain the pattern distortion coefficient;
The coordinate figure of the reference coordinate point in S53, input picture, the pattern distortion coefficient of obtaining according to S52 carries out the geometric correction of imagery, the image after being proofreaied and correct;
S54, the Mobile sign change in location of the image after different stressed lower several corrections of the same area is calculated, obtained the micrometric displacement of Mobile sign;
S6, measure the gained micrometric displacement according to S5, calculate the deformation quantity of soil body sample in topography's two-dimensional coordinate system, deformation quantity to soil body sample carries out the coordinate mapping, obtain the deformation vector of the soil body sample Mobile sign under whole model casing 5 universe coordinate systems, namely obtain two-dimension translational and the rotation parameter of soil body sample, and can set up the correlation analysis data of stressed size and stressed duration.
Further, according to the requirement of sample to the micro-deformation size measurement of soil sample, camera image elemental size a, the camera lens focal distance f, camera imaging meets L/d=a/f apart from the smallest dimension L of d and the micro-deformation detection of soil sample.
Further, after the described model casing 5 of S4 enters rotation test, the perpendicular attitude of model casing emissive plastic glazing 18 during by static state becomes horizontal attitude, high-resolution camera 12 is realized the imaging of the interior soil body sample of model casing 5 by the reflected light path that reflective mirror 15 forms, wherein, the accurate translation that 10 pairs of high-resolution cameras of x traversing guide 9 and z traversing guide 12 carry out on x direction and z direction is controlled, 11 pairs of high-resolution cameras of angle of pitch governor motion, the 12 primary optical axis angles of pitch are adjusted, make x direction and the plane of z direction composition and the mirror surface-shaped angle at 45 ° of reflective mirror 15, namely, the mirror surface-shaped angle at 45 ° of high-resolution camera 12 primary optical axis and reflective mirror 15.
The invention has the beneficial effects as follows:
A, according to the parameter difference of using imaging system components, the soil sample particle two-dimension translational that can obtain and rotation parameter are accurate to 1 CCD picture dot～1/5 picture dot size class, for the Functional Analysis between the stressed duration variation of the micro-deformation of soil body sample, the stressed size variation of soil body sample and soil body sample provides raw data more accurately.
The model casing pivot arm that B, camera are arranged on geotechnical centrifuge is near geotechnical centrifuge turning axle one side, while having avoided the geotechnical centrifuge rotating speed to improve to the damage of camera and camera component.
The accompanying drawing explanation
Fig. 1 is camera seat structure schematic diagram of the present invention.
Fig. 2 is model casing link part schematic diagram of the present invention.
Fig. 3 is imaging system of the present invention and geotechnical centrifuge assembled state skeleton view.
Fig. 4 is the working state schematic representation of imaging system of the present invention and geotechnical centrifuge combination.
Fig. 5 is fixed reference coordinate grid of the present invention.
Fig. 6 is the fixed reference coordinate grid of the present invention micro image of cross spider edge joining in length and breadth.
Fig. 7 is Mobile sign of the present invention.
Fig. 8 is the micro image of Mobile sign of the present invention " ten " word cross spider edge intersection point.
Fig. 9 is the image of Mobile sign of the present invention under initial stressed state in the fixed reference coordinate grid.
Figure 10 is the image of Mobile sign of the present invention after stressed movement in the fixed reference coordinate grid.
In figure: 1, geotechnical centrifuge turning axle, 2, ballast box, 3, the rotating shaft that is connected with cantilever of ballast box, 4, ballast box pivot arm, 5, model casing, 6, the rotating shaft that is connected with cantilever of model casing, 7, model casing pivot arm, 8, geotechnical centrifuge chamber body of wall, 9, the x traversing guide, 10, the z traversing guide, 11, angle of pitch governor motion, 12, high-resolution camera, 13, long burnt telecentric lens, 14, model casing upper bracket, 15, reflective mirror, 16, model lighting source, 17, reflector bracket, 18, emissive plastic glazing, 19, bolt.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described:
The fixed reference coordinate grid density of model casing emissive plastic glazing 18 medial surfaces is according to 135 silent frame camera design.Fixed reference coordinate grid horizontal direction correspondence image CCD face array length limit, namely length is the limit of 26mm, the horizontal direction mesh spacing is 12mm, is denoted as row, means with X; Fixed reference coordinate grid vertical direction correspondence image CCD face battle array minor face, namely length is the limit of 24mm, the vertical direction mesh spacing is 8mm, is denoted as row, means with Y.The fixed reference coordinate grid mask method of cross spider edge intersection point in length and breadth adopts interlacing and marks according to sequence number every row, and as shown in Figure 3,13 mean the 1st row, the 3rd row, and namely coordinate is 1,3.The intersect edge point of selecting to be in same quadrant with the seat label, as gauge point, is measured with image measurer, draws the fixed reference coordinate grid X of cross spider edge intersection point in length and breadth, the Y coordinate.The identification number of Mobile sign is used natural number, the gauge point while selecting the intersection point at edge that is in same quadrant with identification number as post-processed.
To the in-built body sample that bankets of model casing 5, at the position artwork spike Mobile sign of design appointment.Figure spike Mobile sign pinning enters in soil body sample to be fixed, and figure spike Mobile sign upper surface and soil body specimen surface are same plane.Figure spike Mobile sign upper surface is smeared transparent lubricant and is contacted with model casing emissive plastic glazing 18 medial surfaces.Contact position is smeared lubricant with the power of reducing friction.After the soil body sample filling topography of model casing emissive plastic glazing 18 as shown in Figure 9, that is, and the image of Mobile sign of the present invention under initial stressed state in grid reference.
According to formula L/d=a/f, wherein, L is the smallest dimension that the micro-deformation of soil body sample detects, and a is the digital camera grid cell size, and f is lens focus, and d is image-forming range.We know, the in a single day selected camera model of digital camera, and the pixel a of digital camera is just fixed value.In formula, d is image-forming range, and namely object distance, because the camera lens of various focal lengths and the limit of object distance have been considered in the imaging system gantry space in design, therefore, needn't consider the space constraint of lens length and image-forming range, that is, regard as L and a known.
Imaging detection device to the micro-deformation of soil body sample carries out following method operation:
The reference frame of S1, structure soil sample micrometric displacement information, the graticule mesh on use model casing emissive plastic glazing 18 medial surfaces is as benchmark;
S2, the graticule mesh on model casing emissive plastic glazing 18 medial surfaces is measured obtain original state image document image each point coordinate figure under microcosmic, described fixed reference coordinate grid long measure is micron, and the ranks number of image C CD face battle array are carried out to mark;
S3, figure spike Mobile sign is positioned on soil body sample, simultaneously each figure spike Mobile sign is carried out that coordinate indicates and uniqueness indicates, have uniqueness with a plurality of figure spike Mobile signs in once testing;
After S4, model casing 5 enter rotation test, obtain under the initial stressed state, specify under stress and the image of the interior soil body sample of specific location point model casing 5 of fixed time point with the imaging detection device of the micro-deformation of soil body sample;
S5, the image that S4 is obtained carry out camera distortion correction and image random distortion correction, and accurately the micrometric displacement of Mobile sign in reference frame on measurement image, comprise the steps:
S51, image that S4 is obtained are according to camera carries out in advance before test Distortion Detect, and each calibrating parameters of the camera obtained carries out the resampling of position and pixel value;
S52, the same place that the measured data of the intersect edge point of the cross spider in length and breadth of fixed reference coordinate grid in the original state image obtained in S2 and image ranks number are formed mate calculating, obtain the pattern distortion coefficient;
The coordinate figure of the reference coordinate point in S53, input picture, the pattern distortion coefficient of obtaining according to S52 carries out the geometric correction of imagery, the image after being proofreaied and correct;
S54, the Mobile sign change in location of the image after different stressed lower several corrections of the same area is calculated, obtained the micrometric displacement of Mobile sign;
S6, measure the gained micrometric displacement according to S5, calculate the deformation quantity of soil body sample in topography's two-dimensional coordinate system, deformation quantity to soil body sample carries out the coordinate mapping, obtain the deformation vector of the soil body sample Mobile sign under whole model casing 5 universe coordinate systems, namely obtain two-dimension translational and the rotation parameter of soil body sample, and can set up the correlation analysis data of stressed size and stressed duration.
Further, according to the requirement of sample to the micro-deformation size measurement of soil sample, camera image elemental size a, the camera lens focal distance f, camera imaging meets L/d=a/f apart from the smallest dimension L of d and the micro-deformation detection of soil sample.
Further, in the described reference frame of S1, coordinate points is the coordinate points that the measurement of fixed reference coordinate grid under microcosmic on the inboard organic glass of model casing 5 obtains.
Further, the upper surface that the described figure spike of S3 Mobile sign is smeared transparent lubricant contacts with model casing emissive plastic glazing 18 medial surfaces, figure spike Mobile sign pinning enters in soil body sample to be fixed, and figure spike Mobile sign moves with soil body sample in rotation test.
Further, the described figure spike of S3 Mobile sign upper surface has been portrayed cross curve, and described cross curve be take the intersection point at cross spider edge in length and breadth and positioned as gauge point.
Further, the described figure spike of S3 Mobile sign is embedded in soil body sample, and figure spike Mobile sign upper surface and soil body specimen surface are same plane.
Further, after the described model casing 5 of S4 enters rotation test, the perpendicular attitude of model casing emissive plastic glazing 18 during by static state becomes horizontal attitude, high-resolution camera 12 is realized the imaging of the interior soil body sample of model casing 5 by the reflected light path that reflective mirror 15 forms, wherein, the accurate translation that 10 pairs of high-resolution cameras of x traversing guide 9 and z traversing guide 12 carry out on x direction and z direction is controlled, 11 pairs of high-resolution cameras of angle of pitch governor motion, the 12 primary optical axis angles of pitch are adjusted, make x direction and the plane of z direction composition and the mirror surface-shaped angle at 45 ° of reflective mirror 15, namely, the mirror surface-shaped angle at 45 ° of high-resolution camera 12 primary optical axis and reflective mirror 15.High-resolution camera 12, in the movement of x direction and z direction, makes the soil body Sample Image in model casing 5 enter long burnt telecentric lens 13 with reflected light path.
Claims (11)
1. the imaging detection device of the micro-deformation of a soil body sample, comprise geotechnical centrifuge, described geotechnical centrifuge comprises geotechnical centrifuge turning axle (1), described geotechnical centrifuge turning axle (1) lower end is connected with ballast box pivot arm (4) and model casing pivot arm (7), it is characterized in that: near geotechnical centrifuge turning axle (1) one end, set up adjustable camera mount at model casing pivot arm (7), on adjustable camera mount, be fixed with high-resolution camera (12), on the emissive plastic glazing (18) of model casing, model casing upper bracket (14) is installed, at the added reflector bracket (17) that is provided with of model casing upper bracket (14), on described reflector bracket (17), be provided with reflective mirror (15), described adjustable camera mount, camera is electrically connected to recording controller respectively.
2. the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 1, it is characterized in that: described adjustable camera mount comprises camera base, described high-resolution camera (12) is fixed on camera base, and camera base is comprised of x traversing guide (9) and z traversing guide (10) and angle of pitch governor motion (11).
3. the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 1, it is characterized in that: on reflector bracket (17), be provided with model lighting source (16), described reflective mirror (15) is 45 ° of angles with the glass planar of model casing emissive plastic glazing (18).
4. the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 1 is characterized in that: described high-resolution camera (12) camera lens is long burnt telecentric lens (13).
5. the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 1 is characterized in that: the mode that the useful machinery of described model casing emissive plastic glazing (18) medial surface is portrayed or laser beam are burnt the mode direct etching of carving the fixed reference coordinate grid.
6. the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 1 or 5, it is characterized in that: the density of described fixed reference coordinate grid should guarantee the point of crossing of grid reference in every width image of camera >=4, and described fixed reference coordinate grid is orthogonal rectilinear(-al).
7. the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 1 is characterized in that: in described model casing (5), place soil body sample, holding movable sign on soil body sample, Mobile sign are the transparent print spike.
8. the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 7, it is characterized in that: described Mobile sign figure spike head upper surface is the Mobile sign face, the Mobile sign face is the face with the sign groove, described sign groove is cross curve, described cross curve be take the intersection point at cross spider edge in length and breadth and is positioned as gauge point, and the Mobile sign face is smeared transparent lubricant.
9. the method that the imaging detection device that utilizes the micro-deformation of the described soil body sample of claim 1 carries out the imaging detection, is characterized in that, comprises the steps:
The reference frame of S1, structure soil sample micrometric displacement information, the fixed reference coordinate grid on use model casing emissive plastic glazing (18) medial surface is as benchmark;
S2, the fixed reference coordinate grid on model casing emissive plastic glazing (18) medial surface is measured and obtains original state image document image each point coordinate figure under microcosmic, described fixed reference coordinate grid long measure is micron, and the ranks number of image are carried out to mark;
S3, figure spike Mobile sign is positioned on soil body sample, simultaneously each figure spike Mobile sign is carried out to coordinate sign and uniqueness sign, with a plurality of figure spike Mobile signs in once testing, has uniqueness, described figure spike Mobile sign is embedded in soil body sample, figure spike Mobile sign upper surface and soil body specimen surface are same plane, the upper surface that described figure spike Mobile sign is smeared transparent lubricant contacts with model casing emissive plastic glazing (18) medial surface, figure spike Mobile sign pinning enters in soil body sample to be fixed, figure spike Mobile sign moves with soil body sample in rotation test,
After S4, model casing (5) enter rotation test, obtain under the initial stressed state, specify under stress and the image of the interior soil body sample of specific location point model casing (5) of fixed time point with the imaging detection device of the micro-deformation of soil body sample;
S5, the image that S4 is obtained carry out camera distortion correction and image random distortion correction, and accurately the micrometric displacement of Mobile sign in reference frame on measurement image, comprise the steps:
S51, image that S4 is obtained are according to camera carries out in advance before test Distortion Detect, and each calibrating parameters of the camera obtained carries out the resampling of position and pixel value;
S52, the same place that the measured data of the intersect edge point of the cross spider in length and breadth of fixed reference coordinate grid in the original state image obtained in S2 and image ranks number are formed mate calculating, obtain the pattern distortion coefficient;
The coordinate figure of the reference coordinate point in S53, input picture, the pattern distortion coefficient of obtaining according to S52 carries out the geometric correction of imagery, the image after being proofreaied and correct;
S54, the Mobile sign change in location of the image after different stressed lower several corrections of the same area is calculated, obtained the micrometric displacement of Mobile sign;
S6, measure the gained micrometric displacement according to S5, calculate the deformation quantity of soil body sample in topography's two-dimensional coordinate system, deformation quantity to soil body sample carries out the coordinate mapping, obtain the deformation vector of the soil body sample Mobile sign under whole model casing (5) universe coordinate system, namely obtain two-dimension translational and the rotation parameter of soil body sample, and can set up the correlation analysis data of stressed size and stressed duration.
10. the detection method of the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 9, it is characterized in that: according to the requirement of sample to the micro-deformation size measurement of soil sample, camera image elemental size a, the camera lens focal distance f, camera imaging meets L/d=a/f apart from the smallest dimension L of d and the micro-deformation detection of soil sample.
11. the detection method of the imaging detection device of the micro-deformation of a kind of soil body sample according to claim 9, it is characterized in that: after the described model casing of S4 (5) enters rotation test, the perpendicular attitude of model casing emissive plastic glazing (18) during by static state becomes horizontal attitude, high-resolution camera (12) is realized the imaging of the interior soil body sample of model casing (5) by the reflected light path that reflective mirror (15) forms, wherein, x traversing guide (9) and z traversing guide (10) are controlled the accurate translation that high-resolution camera (12) carries out on x direction and z direction, angle of pitch governor motion (11) is adjusted high-resolution camera (12) the primary optical axis angle of pitch, make x direction and the plane of z direction composition and the mirror surface-shaped angle at 45 ° of reflective mirror (15), namely, the mirror surface-shaped angle at 45 ° of high-resolution camera 12 primary optical axis and reflective mirror 15.
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| CN105154716A (en) * | 2015-09-29 | 2015-12-16 | 攀枝花学院 | Preparation method and preparation device of titanium-aluminum alloy |
| CN105259038A (en) * | 2015-11-10 | 2016-01-20 | 浙江大学 | Pipeline heave resistance performance testing device on super-gravity condition |
| CN105259038B (en) * | 2015-11-10 | 2018-02-06 | 浙江大学 | Pipeline Resistant heave performance testing device under the conditions of hypergravity |
| CN106706411A (en) * | 2016-11-18 | 2017-05-24 | 天津大学 | Minitype centrifuge experimental apparatus oriented to three-dimensional printed geotechnical model and research method thereof |
| CN106706411B (en) * | 2016-11-18 | 2019-07-16 | 天津大学 | Micro centrifuge experimental provision and research method towards 3 D-printing geotechnical model |
| CN107941811A (en) * | 2017-12-01 | 2018-04-20 | 西南交通大学 | A kind of full-automatic accurate rivet detects screening plant |
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