A design tool and fabrication guidelines for small low cost horizontal axis hydrokinetic turbines
- A. MuñozL. ChiangE. D. L. Jara
- 1 October 2014
Engineering, Environmental Science
Abstract Small scale and low cost hydrokinetic turbines can effectively contribute to solve energy deficits in developing countries, particularly in isolated communities, but some obstacles remain…
A 3D FEM methodology for simulating the impact in rock-drilling hammers
Abstract A three-dimensional (3D) finite element approach for modeling impact as it occurs in impact tools used in rock drilling is presented. The model permits one to simulate the energy…
Modeling impact in down-the-hole rock drilling
Abstract In this work a study of impact in Down-the-Hole (DTH) rock drilling is carried out. We present an alternative to a method previously introduced by Lundberg and his co-workers. Our model is…
Stepping motor driving by controlled-energy discharge
This paper describes a new electrical driving method for stepping motors based on controlled energy discharge over the motor windings that makes use of the fact that the time response of an LR circuit can be improved by the addition of an adequate capacitance.
Design Optimization of Valveless DTH Pneumatic Hammers by a Weighted Pseudo-Gradient Search Method
A design methodology for Down-The-Hole (DTH) pneumatic hammers used for rock drilling is proposed which renders an optimal design for a given set of constraints. A generic non-linear dynamic model…
Dynamic Analysis of Impact Tools by Using a Method Based on Stress Wave Propagation and Impulse-Momentum Principle
We present a numerical method derived from the Impulse-Linear Momentum Principle that can be used in the design of impact tools for rock drilling. This method allows the prediction of energy…
Discrete crack model for simulating rock comminution processes with the Discrete Element Method
Abstract Comminution processes are not fully understood today and more research is necessary towards the improvement of existing comminution equipment. Presently, the best suited modeling technique…
Dynamic force-penetration curves in rock by matching theoretical to experimental wave propagation response
- L. Chiang
- 1 April 2004
Geology, Engineering
A methodology to obtain the dynamic force-penetration curve of a rock specimen is presented. For this, a simple portable experimental setup is used. On one end, a hand-held hammer strikes a slender…
An aseptic pilot bioreactor for solid substrate cultivation processes
- E. AgosinR. Pérez-CorreaMario FernándezI. SolarL. Chiang
- 1997
Environmental Science, Engineering
Solid Substrate Cultivation processes (SSC) are characterised by the growth of microorganisms within a porous support without free water. This condition favors the development of filamentous fungi,…
Optimal trajectory planning for a redundant mobile manipulator with non-holonomic constraints performing push–pull tasks
- José P. PugaL. Chiang
- 1 May 2008
Engineering, Computer Science
A method to generate optimal trajectories for redundant mobile manipulators based on a weighted function that considers simultaneously joint torques, manipulability and preferred joint angle references is presented.
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