AU2014274555B2 - Applying Photogrammetry for Metrology in Mechanics Teaching Apparatus - Google Patents
Applying Photogrammetry for Metrology in Mechanics Teaching Apparatus Download PDFInfo
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- AU2014274555B2 AU2014274555B2 AU2014274555A AU2014274555A AU2014274555B2 AU 2014274555 B2 AU2014274555 B2 AU 2014274555B2 AU 2014274555 A AU2014274555 A AU 2014274555A AU 2014274555 A AU2014274555 A AU 2014274555A AU 2014274555 B2 AU2014274555 B2 AU 2014274555B2
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Abstract
Using photogrammetry to perform deflection, deformation or buckling measurements in test models
(beams, columns, trusses, frames, other model structures) in Mechanics style experiments. One or
more digital images of the experiment setup are taken using a digital camera or other digital image
capturing device, and the image is processed to obtain co-ordinates of selected points on the desired
elements or structure under test.
Description
Using photogrammetry to perform deflection, deformation or buckling measurements in test models (beams, columns, trusses, frames, other model structures) in Mechanics style experiments. One or more digital images of the experiment setup are taken using a digital camera or other digital image capturing device, and the image is processed to obtain co-ordinates of selected points on the desired elements or structure under test.
Applying Photogrammetryfor Metrology in Mechanics Teaching Apparatus
This invention relates to photogrammetry, and in particular, but not exclusively to a teaching apparatus and method relating to mechanics style experiments.
Photogrammetry can be described as 'the science of investigating transformed digital images for the purposes of performing metrology'. This science has rapidly evolved over the past decade, in parallel with advances made in digital cameras both in terms of pixel resolution of the image, and quality and dimensional stability of the camera body, the associated lenses used and in photogrammetry software.
What is needed is a way in which this new technology can be made accessible to students in a classroom setting, to help students better understand mechanics style experiments.
It is therefore an object of the present invention to provide a mechanics teaching apparatus which will at least go some way towards overcoming one or more of the above-mentioned problems, or at least provide the public with a useful choice.
Accordingly, in a first aspect, the invention may broadly be said to consist in a teaching apparatus for use in mechanics style experiments to demonstrate deflection or deformation in structural elements when subjected to loading, the apparatus including a hand-transportable frame within which loads can be applied to structural elements and a digital camera, wherein the deflection or deformation is constrained within two dimensions within the hand-transportable frame, and the amount of deflection can be captured and measured by taking a first digital photograph when a structural element is in an unloaded state or in a first loading state within the hand-transportable frame, and taking a second digital photograph when the structural element is in a second
I loading state, allowing the amount of deflection or deformation in the structural element to be determined by obtaining a set of coordinates of at least one reference point on the structural element in the first digital photograph and comparing that set of coordinates with the corresponding set of coordinates of the same reference point in the second digital photograph.
Preferably the hand-transportable frame includes at least one rail that is used to support and guide one or more carriages that are used to constrain the deflection or deformation of a structural element when under load, within the said two dimensions.
Figure 1 shows an example of digital image capture in a column buckling.
The invention involves the use of photogrammetry to perform deflection, deformation or buckling experiments in test models (beams, columns, trusses, frames, other model structures) in Mechanics style experiments. One or more digital images of the experiment setup are taken using a digital camera or other digital image capturing device, and the image is processed to obtain co-ordinates of selected points on the desired elements or structure under test.
This style of metrology can be applied to perform deflection/deformation measurements in test models in Mechanics style experiments such as (but not limited to):
• Co-planar Force Equilibrium
• Deflected shapes of Beams
• Deflected shapes of Columns
• Deflected shapes of Trusses
• Deflected shapes of Frames
• Deflected shape of other structural elements and structural forms.
The two steps needed to perform this metrology are:
1. Take one or more digital images of the Mechanics experiment setup using a digital camera, phone camera or other digital image capturing device, and
2. Process the image to obtain co-ordinates of selected points on the desired elements or structure under test in the experiment.
Figure 1 depicts an example of Step 1 being performed on a column buckling experiment in Mechanics for the deformed shape of the two columns under test.
A teaching apparatus for use in mechanics style experiments can be seen in Figure 1. This teaching apparatus is shown in a demonstration of deflection or deformation in a structural element when it is being subjected to loading. It can be seen that the apparatus includes a hand-transportable frame within which loads can be applied to structural elements. In the example shown, the deformation or deflection is restricted to movement within the two-dimensional plane defined by the hand-transportable frame. Movement is restricted to this plane by the carriages which support the free end of each column being subjected to a compression loading. The carriages are constrained to move along rails which from a part of the transportable frame, and which lie in the plane of the transportable frame.
The apparatus also includes a digital camera, and the amount of deflection can be captured and measured by taking a first digital photograph when a structural element is in an unloaded state or in a first loading state within the transportable frame, and taking a second digital photograph when the structural element is in a second loading state, allowing the amount of deflection or deformation in the structural element to be determined by obtaining a set of coordinates of at least one reference point on the structural element in the first digital photograph and comparing that set of coordinates with the corresponding set of coordinates of the same reference point in the second digital photograph.
Claims (3)
1. A teaching apparatus for use in mechanics style experiments to demonstrate deflection or deformation in structural elements when subjected to loading, the apparatus including a hand-transportable frame within which loads can be applied to structural elements and a digital camera, wherein the deflection or deformation is constrained within two dimensions within the hand-transportable frame, and the amount of deflection can be captured and measured by taking a first digital photograph when a structural element is in an unloaded state or in a first loading state within the hand-transportable frame, and taking a second digital photograph when the structural element is in a second loading state, allowing the amount of deflection or deformation in the structural element to be determined by obtaining a set of coordinates of at least one reference point on the structural element in the first digital photograph and comparing that set of coordinates with the corresponding set of coordinates of the same reference point in the second digital photograph.
2. A teaching apparatus as claimed in claim 1, wherein the hand-transportable frame includes at least one rail that is used to support and guide one or more carriages that are used to constrain the deflection or deformation of a structural element when under load, within the said two dimensions.
3. .
Figure 1: Example of Step 1 - Digital Image Capture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2014274555A AU2014274555B2 (en) | 2014-12-10 | 2014-12-10 | Applying Photogrammetry for Metrology in Mechanics Teaching Apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2014274555A AU2014274555B2 (en) | 2014-12-10 | 2014-12-10 | Applying Photogrammetry for Metrology in Mechanics Teaching Apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2014274555A1 AU2014274555A1 (en) | 2016-06-30 |
| AU2014274555B2 true AU2014274555B2 (en) | 2021-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2014274555A Active AU2014274555B2 (en) | 2014-12-10 | 2014-12-10 | Applying Photogrammetry for Metrology in Mechanics Teaching Apparatus |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2014274555B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060136102A1 (en) * | 2004-12-17 | 2006-06-22 | U.S.A. As Represented By The Administrator Of The National Aeronautics And Space Administration | Method for correcting control surface angle measurements in single viewpoint photogrammetry |
-
2014
- 2014-12-10 AU AU2014274555A patent/AU2014274555B2/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060136102A1 (en) * | 2004-12-17 | 2006-06-22 | U.S.A. As Represented By The Administrator Of The National Aeronautics And Space Administration | Method for correcting control surface angle measurements in single viewpoint photogrammetry |
Non-Patent Citations (2)
| Title |
|---|
| JIANG, R. et al., ‘Close-range photogrammetry applications in bridge measurement: Literature review’, Elsevier ScienceDirect Measurement, Vol.41 Issue 8, 1 October 2008, pp. 823-834. * |
| PITCHER, N. et al, ‘Videogrammetry Dynamics Measurements of a Lightweight Flexible Wing in a Wind Tunnel’, Proc. 50th American Institute of Aeronautics and Astronautics Conference, 4 - 7 May 2009, Palm Springs CA, USA, 15 pages. * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2014274555A1 (en) | 2016-06-30 |
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Legal Events
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| HB | Alteration of name in register |
Owner name: STRUCOMP PTY. LTD. Free format text: FORMER NAME(S): STRUCOMP |
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| FGA | Letters patent sealed or granted (standard patent) |