Design Of ‘Smart’ Pebble For Sediment Entrainment Study
Author(s)
A. Dwivedi, B. Melville, E. Akeila & Z. Salcic
Abstract
Design of ‘Smart’ pebble for sediment
entrainment study
A. Dwivedi1, B. Melville1, E. Akeila2 & Z. Salcic2
1Department of Civil & Environmental Engineering,
The University of Auckland, Auckland, New Zealand
2Department of Electrical and Computer Engineering,
The University of Auckland, Auckland, New Zealand
Abstract
The ‘Smart’ pebble is a small self-equipped datalogger having a 40 mm outer
diameter with a built-in sensor for acceleration and rotation measurements. This
pebble has the capability to detect instantaneous acceleration due to turbulence in
fluid, which is indicative of hydrodynamic forces acting on the pebble. The
pebble stores the data continuously in its internal memory. These data can
subsequently be transferred by serial port to a computer for detailed analysis.
Test runs using the smart pebble have been carried out to validate accurate
functioning of the acceleration and gyro sensor. The acceleration of the smart
pebble was compared to the acceleration of the shake table. The results show the
excellent capability of the pebble to record the instantaneous forces acting on the
pebble during its entrainment.
Keywords: entrainment, hydrodynamic forces, accelerometer, gyroscope.
1 Introduction
In order to understand the processes causing particle entrainment, the stability of
the separate particles must be evaluated. The hydrodynamic forces on the
particles are very important for understanding this stability. Figure 1 (a) shows
the hydrodynamic forces acting on the sediment particle. Figure 1 (b) shows the
test arrangement of smart pebble.
This research has been aimed at improving the present level of understanding
of the physical processes involved in the transport of individual sediment
particles in the near bed region of a turbulent open channel flow by the use of
smart pebble.
Keywords
entrainment, hydrodynamic forces, accelerometer, gyroscope.
Related Book
Other papers in this volume
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