Contact Information:
University:
The State University of Norte Fluminense Darcy Ribeiro
Teams Members (with graduation):
Lucas de Oliveira Otal - automation engineering (2010) and safety engineering (2012)
Matheus Ladeira Vieira - automation technician(2012)
Walber Silva de Souza - automation technician (2012)
Faculty Advisers: Sérgio Tibana
e-mail adress: tibana@uenf.br
Submission Language: English
Project Information:
Title: Development of automation systems for tests in geotechnical centrifuge
Description:
Reduced models induced to geotechnical centrifuge acceleration present a
technological challenge linked to automation and data acquisition, because the whole system
will be under a gravitational field greater than the one that we are submitted. So, engineering
projects can be tested on a small scale while respecting the laws of similarity and equivalent
with the prototype.
In the case presented, a study of buried pipes submitted to surface charge, was realized
with the goal to simulate a real field situation, evaluating the deformation of the pipe for different
dimensions of settlement and relative density of the sand model.
Products:
NI PXI 1050(PXI Chassis With Integrated SCXI--8 PXI/4 SCXI Slots)
NI PXI 8110 (2.26 GHz Quad-Core PXI Embedded Controller)
NI PXI 6221 (16-Bit, 250 kS/s, 16 Analog Inputs)
NI SCB 68 (Shielded I/O Connector Block for DAQ Devices with 68-Pin Connectors)
NI PXI 7350 (Motion Controller) NI PXI 1411 (Single-Channel Color Image Acquisition Device)
UMI 7774 (4-Axis Universal Motion Interfaces for Industrial Applications)
NI SCXI 1520 (8-Channel Universal Strain Gage Input Module)
NI SCXI 1314 (Front-Mounting Terminal Block -Screw Terminals)
NI SCXI 1121 (4-Channel Isolation Amplifier With Excitation)
NI SCXI 1321 (Offset-Null and Shunt Calibration Terminal,Cast)
The Challenge:
Perform servo-controlled tests, via wireless network, of buried pipes submitted to a
gravitational field of 13Gs, to determine the deformations due to a moving surface load. After
that, perform a detailed analysis of data to understand the behavior of pipes under these
conditions, using NI Diadem software.
The Solution:
Using National Instruments equipments and the LabView software to control the servo
motor (NI PXI 7350), performing data acquisition of strain gages (NI SCXI 1520), load
transducers (NI SCXI 1121), displacement transducer (NI SCB 68) besides the image
acquisition (NI PXI 1411).
During project development, some obstacles have arisen. The first was the realization
of wireless communication, which was solved using the TeamViewer program, which allowed
remote access to the desktop of the NI PXI 1050.
The initial goal of the project was achieved. The results were satisfactory. National
Instruments equipment constituted a key part in this process, allowing even under a different
gravitational field, the tests were carried out quickly, efficiently and extremely accurate.
The results were analyzed using the software NI Diadem, which allowed the integration
of the video data with the data from the instrumentation, allowing a detailed and critical analysis,
which resulted in making an accurate report.
Time to built: it took two years to reach the results shown here.
Additional revisions that could be made:
The project could have been filmed on the front (besides the above shoot that was held) of the container. Thus, some analysis of the results could have been made through images, in addition to other analyzes that were performed.
